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Operating and Service Manual 
 
For 
 
518 Centrifuge 
380 VAC 50 Hz 
460 VAC 60 Hz 
575 VAC 60 Hz 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
M-I SWACO 
A Smith/Schlumberger Company 
5950 North Course Drive 
Houston, Texas 77072 
 
Tel: 281-988-1868 
Fax: 281-988-1888 
 
 
MANUAL PART #90-90-061 (REV. B) 
 
 
 
 
DISCLAIMER 
 
Recommendations made by Swaco are advisory only. Swaco shall not be liable 
under any guarantees or warranties, expressed or implied, in any manner or form, 
AND ALL WARRANTIES, EXPRESSED OR IMPLIED, ARE HEREBY 
SPECIFICALLY EXCLUDED, and Swaco shall not be liable for the failure to 
obtain any particular results from the use of any recommendation made by it or 
from the use of this material. In no event shall Swaco be liable for incidental or 
consequential damages. 
 
 
 
 
 
 
 i
Table of Contents 
 
 Page 
Introduction 1 
 
Safety Precautions 2 
 
Section 1 Unit Description 3 
 
1.1 Centrifuge Components 3 
1.2 Specifications 7 
1.3 Rotating Assembly Components 8 
1.4 Safety Components 8 
1.5 Bowl and Conveyor Speeds 9 
1.6 Step Sheaves 9 
 
Section 2 Installation 11 
 
2.1 Transportation and Handling 11 
2.2 Centrifuge Mounting 12 
2.3 Electrical Installation 12 
2.4 Feed Pump 12 
2.5 Liquid Feed and Discharge 13 
2.6 Solids Discharge 13 
2.7 Startup and Shutdown 13 
 
Section 3 Inspection and Maintenance 14 
 
3.1 Shop Inspection 14 
3.2 Lubrication 15 
3.3 Maintenance of Fluid Couplings 19 
3.4 Cleaning 20 
3.5 Belt Tensioning 20 
3.6 G.S. Coupling 21 
3.7 Vibration Sensing Switch 25 
3.8 Fluid Coupling 25 
3.9 Electrical System 25 
 
Section 4 Troubleshooting Chart 26 
 
 
 ii
 Page 
Section 5 Repair and Overhaul 27 
 
5.1 Rotating Assembly Removal 27 
5.2 Rotating Assembly 27 
 
5.2.1 Bearing Alignment 27 
5.2.2 Gearbox Removal 30 
5.2.3 Disassembly Gearbox 30 
5.2.4 Conveyor Removal 32 
5.2.5 Assembly - Gearbox End 33 
5.2.6 Disassembly - Large Conveyor Bearing 33 
5.2.7 Assembly - Large Conveyor Bearing 34 
5.2.8 Disassembly - Feed End 37 
5.2.9 Assembly - Feed End 38 
5.2.10 Disassembly - Small Conveyor Bearing 38 
5.2.11 Assembly - Small Conveyor Bearing 39 
5.3 Bowl 40 
5.3.1 Level Regulating Discs 40 
5.3.2 Solids Discharge Bushings 41 
5.4 Conveyor 42 
5.4.1 Shimming 42 
5.4.2 Installation 42 
 
Section 6 Diagrams and Parts List 
 
1. 414 Centrifuge 44 
2. Bowl Assembly 47 
3. Gearbox End Assembly 49 
4. Feed End Assembly 51 
5. G.S. Coupling 54 
6. Frame 56 
7. Vessel 58 
8. Conveyor 60 
9. Shim Selection 62 
10. 350 kpm Gearbox 64 
11. Electrical Assembly 66 
12. Electrical Wiring Diagram 68 
13. Electrical Cabling 70 
14. Electrical Schematic Diagram 71 
15. Feed Pump Electrical Diagram 72 
16. Special Tools 73 
 
Section 7 Appendix 
A. Gyrol Fluid Coupling 
B. Vibra Switch 
C. Conveyor Wear Recording 
D. Plessey Coupling 
 
 1
Introduction 
 
This manual contains directions and information concerning the installation, startup, 
shutdown and service of the Swaco 518 Centrifuge. Appropriate sections of this 
manual must be read and understood before attempting to install, operate or service 
this unit. Failure to do so may cause injury to personnel, damage to the equipment or 
reduced performance. 
 
The Swaco 518 Centrifuge is known as a decanting type separator. A decanter is a 
centrifugal separator having a horizontal axis of rotation. A process liquid or slurry is 
supplied to the rotating bowl where the solids are separated from the liquid phase. 
The solids are forced to the inner wall of the bowl while the liquid forms a ring inside 
the solids. A screw type conveyor transports the solids toward the tapered end of a 
conical bowl. The liquid flows in a spiral path, established by the conveyor flights, to 
the discharge ports at the large end of the bowl. 
 
The primary application for the 518 Centrifuge is to run in series with the 414 
Centrifuge for secondary separation of low gravity solids an recovery of the 
expensive liquid phase. 
 
 
 
 2
General Safety Precautions 
 
The Swaco 518 Centrifuge is engineered and manufactured to perform safely under 
conditions described in this manual. This large high speed rotating machine requires 
care and understanding for maximum safety. Unsafe practices in maintenance and 
operation will cause conditions which are hazardous to both maintenance and 
operation and cause conditions which are hazardous to both personnel and property. 
The following general precautions should be strictly followed to avoid damage to 
property and/or death to personnel. 
 
1. Do not allow personnel to maintain, install, or operate the 518 Centrifuge until 
they have read this manual and understood safety requirements. 
2. Do not operate the centrifuge until it is properly mounted. 
3. Do not operate the centrifuge if the machine is not completely and correctly 
assembled. 
4. Do not inactivate the centrifuge for any extended period of time without 
inactivating the electrical circuit to the motors. 
5. Be sure wiring is connected according to wiring plate on motors. 
6. Do not operate the machine unless the cover is closed and clamps and 
clamping devices are tightened. 
7. Do not use inlet connections as supports for feed hoses. 
8. Do not operate the centrifuge if unusual noise or vibration exists. 
9. Do not attempt to repair the centrifuge until the switch box is locked in OFF 
position or has had the breakers locked OPEN. 
10. Do not attempt to assemble or disassemble the centrifuge if the bowl is 
rotating. 
11. Do not operate the 518 Centrifuge until startup and shutdown procedures are 
understood. 
12. Do not attempt to manually shutoff the back drive motor. It will automatically 
shutoff approximately 10 minutes after the bowl drive motor stop button has 
been released. 
 
 
 
 3
Section 1 Unit Description 
 
 1.1 Centrifuge Components 
 
1.1.1 The centrifuge bowl is the outer member of the rotating assembly and is 
composed of one cylindrical section and a conical section. The end piece on 
the cylindrical end has ports through which the liquid flows out. Semi-dry 
solids are discharge through ports in the small end of the conical section. The 
hollow shaft at each end of the bowl is suspended in a pillow block bearing to 
allow rotation of the bowl. (See Figure 1) 
 
Figure 1 (Bowl) 
 
1.1.2 The conveyor is suspended inside the bowl on bearings and rotates in the 
same direction as the bowl, only slightly slower. The separated solids are 
forced to the inside wall of the bowl by centrifugal force and conveyed to the 
solids discharge ports in the bowl. The pitch (P) of the conveyor flights is the 
distance in millimeters between the flights measured parallel to the axis of the 
conveyor. 
 
 
Figure 2 (Conveyor) 
 
 4
1.1.3 The planetary gear box, is fitted on the hollow shaft at the cylindrical end of 
the bowl. It drives the conveyor by means of a shaft going through the hollow 
shaft of the bowl. On the end of the gear box opposite the bowl, is a small 
shaft. This is the small sunwheel shaft of the planetary gear box. The speed 
and direction of the small sunwheel determines the differential speed, or the 
relative speed of the bowl and the conveyor.1.1.4 The frame is the tubular steel member on which the bowl pillow block 
bearings, feed tube bracket and the vessel are mounted. See Figure 4 
 
Figure 4 (Frame) 
 
 5
1.1.5 The vessel is a stainless steel case mounted on the frame that completely 
encloses the bowl. It is divided into compartments that divert the liquid and 
solids discharge to their respective outlets. The semi-circular cover is hinged 
to allow easy access to the bowl for inspection and maintenance. 
 
Figure 5 (Vessel) 
 
 
1.1.6 A feed tube is shown in Figure 6. Mud is introduced into the centrifuge 
through the feed tube Item 185, Diagram 1. This is a stainless steel tube 
approximately 2" O.D. and 36" Lg. It extends into the bowl and conveyor 
through the hollow shaft on the conical end of the bowl. Mud is pumped into 
the tube by the feed pump. The mud leaves the feed tube and enters the bowl 
through a slot in the conveyor (See Figure 2 - Conveyor). This slot in the 
conveyor extends approximately the length of the conical section. 
 
Figure 6 (Feed Tube) 
 
 6
1.1.7 The belt guards on the 518 Centrifuge are made so that access to belts and 
G.S. Torque limiting coupling is through the split door on the side. The upper 
half of the door folds down for belt inspection and tightening and resetting the 
G.S. coupling. The door may be completely removed for other repairs. 
 
 
 
 
Figure 7 (Belt Guards) 
 
 
 
 7
1.2 Specifications 
 
 Length 119 inches (3023 mm) 
 Width 70 inches (1778 mm) 
 Height 34 inches (864 mm) 
 Weight 4660 lbs. (2118 kg.) 
 Power Required 380 Vac 50 Hz 3 Ph 
 460 Vac 60 Hz 3 Ph. 
 575 Vac 60 Hz 3 Ph. 
 Current limiting fused Bussmann LPS 50 or 
 equivalent (Other voltages and frequency 
 available on special order) 
 
 Motors 25 Hp Main Drive 
 7-1/2 Hp Back Drive 
 Bowl: 
Dimensions 14" Dia (356 mm). x 56" Lg. (1422 mm) 
 Material Stainless Steel 
 
 Conveyor: 
 Type 
 Pitch 4.33 inches (110 mm) 
 Material Stainless Steel 
 
 Gearbox: 
 Type Planetary 
 Ration 57:1 
 Mx. Torque 350 KPM (Kilopoundal meters) 
 
 Bowl Speed: 
 High Speed 3200 rpm 
 Standard 2500 rpm 
 High Volume 1900 rpm 
 
Recommended Feed Rate* at: 
 High Speed 100 gpm (23 m/hr) 
 Standard Speed 150 gpm (34 m/hr) 
 High Volume 250 gpm (57 m/hr) 
 
* The maximum feed rates will depend to some extent on the percent and type of solids 
 
 
 
 8
1.3 The centrifuge rotating assembly consists of the bowl, the conveyor and the planetary 
gearbox. All these items are described in Paragraph 1.1.1, 1.1.2 and 1.1.3. 
 
1.4 The following safety components are incorporated in the Swaco 518 Centrifuge 
 
 1.4.1 Vibration Detection Switch 
 
This switch, Item 223, Diagram 1, is mounted on the centrifuge frame. Its 
function is to automatically shut off power to the bowl drive motor and feed 
pump when controlled by Centrifuge Control System, should excessive 
vibration of the unit develop, regardless of cause. 
 
 1.4.2 Torque Limiter 
 
The torque limiter is a combination of mechanical and electrical controls. The 
small sunwheel shaft has a spring loaded coupling (G.S. Coupling - See 
Figure 12) which will limit the torque that can be applied to the shaft. If this 
limit is exceeded the coupling will disengage and will, by axial movement of 
the coupling, trip a limit switch, Item 224, Diagram 1. This will disconnect 
power from the bowl drive motor and the feed pump when controlled by 
Centrifuge Control System. 
 
1.4.3 The mass of the rotating assembly is very high. To bring this assembly up to 
operational speed takes from 90 to 100 seconds. A fluid coupling is installed 
between the drive motor and the rotating assembly to allow the motor to attain 
full operating speed almost immediately and allow the bowl to reach 
operational speed gradually. 
 
 Without the fluid coupling, the motor current on startup would be excessively 
high and could result in damage such as overheating of connectors and cable 
or motor overload protectors or could overload the power plant if it was 
operating near full load. 
 
 Should a high load on the rotating assembly cause excessive slip in the fluid 
coupling, the heat so generated will melt a fusible plug in the coupling causing 
the oil to be dumped. This will unload the motor before any damage is done. 
 
 
 9
 
1.4.4 Overspeed of back drive motor 
 
The small sunwheel is driven by a back drive motor (Paragraph 1.1.3). 
Overspeed of the back drive motor could occur if the back drive motor is 
turned off before or immediately after the main drive motor. This would 
allow the conveyor to assume the bowl speed. The rotation would be 
transferred through the gearbox to the small sunwheel shaft and through the 
belts to the back drive motor to rotate at higher than designed motor speeds 
and could cause the motor armature to fly apart resulting in property damage 
and/or personal injury or death. 
 
Back drive over speed is prevented by an electrical interlock. This interlock 
consists of a relay (Item 250, Diagram 12) which allows automatic shut off of 
the back drive motor approximately 10 minutes after the main drive motor is 
shut off. The time needed before back drive shut off is necessary since low 
friction in the pillow block bearing and the mass of the rotating assembly 
allow ten (10) to twenty (20) minutes of rotation after main drive motor shut 
off. 
 
1.5 Bowl and Conveyor Speed 
 
The 518 Centrifuge is operated between 1900 and 3200 rpm's depending on the 
application. The conveyor rotates at approximately 35 to 55 rpm's less than the bowl 
in the same direction. The 518 Centrifuge operate at all times with the bowl and 
conveyor turning in the same direction and the conveyor turning slower than the 
bowl. The main drive motor should be wired so that the bowl always turns clockwise 
when viewed from the feed tube end. 
 
The small sunwheel in the gearbox is used to vary the differential speed between the 
bowl and conveyor. If the sunwheel is "fixed", that is, not rotated by the back drive 
motor, the differential will equal the bowl RPM divided by the gearbox ratio (57:1). 
If it turns in the same direction as the bowl, the differential will be less than when it is 
fixed. If it turns in the opposite direction as the bowl, the differential will be greater 
than when it's fixed. (See Diagram 10) 
 
1.6 Step sheaves having two pitch diameter sizes each on the main drive motor and bowl 
sheaves permit operation of the 518 Centrifuge at 1900 and 2500 and 3200 rpm's. 
The bowl speed is determined by the combination of sheave sizes selected on the 
bowl and motor. The motor mount is made to allow the motor and sheave to move a 
full sheave width for proper alignment to obtain the full range of bowl speeds. 
 
 
 10
 
Caution: 
 
DO NOT ATTEMPT TO OPERATE 518 CENTRIFUGE AT BOWL SPEEDS ABOVE 
3200 RPM'S. SPEEDS ABOVE 3200 RPM'S WILL EXCEED THE DESIGN SAFETY 
LIMITS. THIS COULD CAUSE THE MACHINE TO DESTROY ITSELF POSSIBLY 
CAUSING INJURY OR DEATH. 
 
The figure below provides the combination of sheave sizes to drive the Centrifuge bowl at 
the speed indicated. 
 
 
 
60 Hz., 1750 rpm motor: 
 
Description Part Number Size 
Bowl Sheave 96-10-416 4-3V-5.6/4-3V-7.4 
Bowl Motor Sheave 96-10-414 4-3V-10.6/4-3V-8.0 
Back Drive Motor Sheave 05-79-096 3-3V-10.6 
Main Drive Belt 05-06-119 3V900 
Main Drive Belt 05-06-114 3V850 
Back Drive Belt 05-06-126 3V1000 
 
50 Hz 1450 rpm motor 
 
Description Part Number Size 
Bowl Sheave 96-10-416 4-3V-5.6/4-3V-7.4 
Bowl Motor Sheave 96-10-417 3V-10.6/4-3V-8.0 
Back Drive Motor Sheave 05-79-096 3V-10.6 
Main Drive Belt 05-06-119 3V900 
Main DriveBelt 05-06-114 3V850 
Back Drive Belt 05-06-126 3V1000 
 
 
 
 11
Section 2 Installation 
 
 2.1 Transportation and Handling 
 
2.1.1 The pillow block bearings are subject to damage from shock and 
vibration during transportation and handling. To prevent this, the 
pillow block bearing should be preloaded using wedge blocks shown 
in Figure 8 
 
Figure 8 (Wooden Wedge Blocks) 
 
 
 
 12
 2.1.2 Care should be used in loading and unloading this unit to prevent any 
 unnecessary shock to the components. 
 
2.1.3 Caution: When lifting, always use a four point lift to protect unit from 
damage and/or turning upside down during lift. 
 
2.2 Centrifuge Mounting 
 
The 518 Centrifuge must be mounted above the ground to facilitate solids removal. 
For recovery of weight material the solids discharge outlet should be located over a 
well stirred area of the mixing pit. A slide attached from the solids outlet may be 
necessary to route solids to the mixing pit. The slide should be set at a steep angle to 
prevent a solids buildup. 
 
The Centrifuge unit must be set level and on adequate supports. It may be necessary 
to attach it to the support by tack welding. 
 
2.3 Electrical Installation 
 
2.3.1 The electrical installation should be made by a qualified electrician. Input 
power fusing must be current limiting type. See Wiring Schematic, Diagram 
12 for sizing. 
 
2.3.2 Feed Pump - Control circuit power is taken from terminals TB1 and TB2 in 
the main control box (Item 216, Diagram 11) for the feed pump starter. This 
requires running a 14 gauge 2 conductor approved wire from the main control 
box to the feed pump starter. For typical hookup see Diagram 15. Pump 
starter holding coil must be 120 volts. Power for pump may come from any 
source of sufficient amperage and proper voltage. If feed pump auto shut 
down feature is not desired, starter may be used as wired and power cable 
hooked to any source of proper voltage and sufficient amperage. 
 
2.4 Feed Pump 
 
2.4.1 Any pump capable of furnishing the feed rate desired at sufficient pressure to 
overcome line loss may be used to feed the 518 Centrifuge. 
 
2.4.2 A 5 Hp variable speed progressive cavity pump which furnishes 22 gallons 
per 100 revolutions is available from Swaco and is ideal for feed between 40 
and 80 gpm's. (Swaco Type II Pumping Unit) 
 
 
 13
2.4.3 A centrifugal pump assembly capable of furnishing up to 250 gpm at 45 feet 
of head is adequate for high volume operation. This type of pump is also 
available from Swaco. (Swaco Type III Pump Unit) 
 
2.2.4 Suction and discharge lines on the feed pump should be sized to minimize 
head loss due to line friction. 
 
2.4.5 A water line should be connected between the pump and the feed tube for 
washing the bowl and conveyor prior to shutdown. 
 
2.5 Liquid Feed and Discharge 
 
2.5.1 The line feeding mud to the centrifuge should terminate with a male 2" NPT 
fitting to mate with the 2" elbow on the feed tube. This line should be 
supported so it's weight will not be on the feed tube. 
 
2.5.2 The liquid outlet is a 8" Victaulic nipple. See Figure 5. The line connecting 
to this nipple can be steel hard piping, flexible hose or PVC pipe. It should be 
sized to accommodate the liquid discharge rate. Because the liquid discharge 
is gravity flow, consideration should be given to the fall and length of this line 
to avoid plugging from solids settling. 
 
2.6 Solids Discharge 
 
2.6.1 The outlet for solids discharge is 11-1/4" (286 mm) x 18-1/2" (470 mm) with 
a 1-1/4" (32 mm) wide flange. See Figure 5 
 
2.6.2 If the centrifuge cannot be located over the proper area a slide may be 
attached to the solids outlet to route solids to the mixing pit. Since these 
solids will be sticky, the slide must be set at a steep angle to prevent a solids 
buildup. 
 
2.7 Startup and Shutdown 
 
 2.7.1 Startup 
 
 Start back drive motor 
Start main drive motor about 10 seconds after back drive motor. Do not start 
motors simultaneously. The sudden power drain may overload the power 
source. 
 
Allow at least two (2) minutes for the centrifuge to obtain operating speed. 
Bring mud feed rate up slowly to desired rate. 
 
 
 
 14
 2.7.2 Before shutdown of the 518 Centrifuge, it is necessary to flush the bowl with 
 water. 
 
 1. Shut off the feed pump. 
 2. Close the mud suction valve. 
3. After all conveyable solids have cleared the bowl, open the water line 
which tees into the pump discharge line. 
4. Flush the centrifuge until clean water is discharged. Close the water 
valve. 
5. Stop the main drive motor. When the main drive motor is shut off, and 
electrical interlock activates and will automatically shut the back drive 
motor off after approximately 10 minutes. 
6. If the machine is likely to be subjected to freezing temperatures, the 
cover should be opened and bowl drained by removing two drain plugs 
on the liquid discharge end (Item 25, Diagram 2). Drain any hoses and 
pumps that may have liquid trapped in them. 
 
Section 3 Inspection and Maintenance 
 
 3.1 Shop Inspection 
 
3.1.1 With the cover closed and bolted down, rotate the bowl by hand and 
listen for any unusual noise or scrapping. The bowl should turn freely 
without drag. Any noises should be investigated. Check the G.S. 
coupling to be sure it is engaged. See Section 3.6 
 
3.1.2 With cover open, rotate bowl assembly by hand and listen for any 
noise coming from within the bowl or the bearings. Any noisy 
bearings should be inspected and/or replaced. See Section 5.2 
 
3.1.3 Check gearbox oil level. Remove magnetic plugs and inspect for 
metallic wear particles - See Figure 10. A large accumulation of 
metallic wear particles should be investigated and the cause 
determined. Refer to Section 3.2.2, Lubrication of Gearbox. 
 
3.1.4 Inside J-Boxes, Diagram 12: 
 Check heater packs, Item 249, 237 for proper ratings. 
 Check fuses Item 245,246,244 to see if they are good, properly sized 
and installed properly. 
 
 Check limit switch, Item 224, Diagram 1, which is under back drive 
 
 
 15
guard to see if it is closed when set against G.S. coupling, Figure 12, and open 
when coupling is disengaged, Figure 12. 
 
3.2 Lubrication 
 
 3.2.1 Lubrication of Bearings 
 
The pillow block and conveyor bearings should be lubricated every 100 hours 
of operation. See Figure 9 for location of grease fittings. Grease vent holes 
located behind pillow block housing and in gearbox cover nearest the bowl, 
are shown in Figure 9. Proper greasing is obtained when excess grease comes 
out the vent holes. 
 
The following is a partial list of suitable lithium soap, vibration resistant 
greases which may be used for bearing lubrication. 
 
 BP Energrease XRB2 
 Castrol Spheerol APS2 
 Exxon Beacon 2 
 Gulfcrown Grease FF2E 
 Mobilux Grease 2 
 Shell Alvania 2 
 Texaco Regal AFB 2 
 
NOTE: Contact your nearest Swaco representative or service center for 
approval of lithium base lubricants not shown on the above list. 
 
DO NOT USE CALCIUM BASE GREASE 
Calcium base grease is not compatible with recommended greases and will 
cause bearing failure. Bearing failure could damage bearing housings and 
other bearing parts. 
 
 
 
 16
 
 
 
 
 
 
 
 17
 
 3.2.2 Lubrication of Gearbox 
 
The 350 KPM gearbox contains two treaded plugs. The two plugs are 
magnetic and are removed for oil draining and filling. The magnetic plugs 
attract metallic particles, in the lubricating oil. 
 
The oil level in the gearbox should be checked before centrifuge operation. 
Remove inspection plate on side of gearbox (See Figure 10b). Oil level is 
checked with the plugs are 64°of vertical (See Figure 10a). 
 
Angle is correct when plug is centered on a line between the two inspection 
palte hold down screw holes. Normal oil level is indicated by oil at bottom 
edge of hole. After initial centrifuge operation the oil level should be checked 
weekly or whenever bearings are greased. The magnetic drain plugs should 
also be checked and metallic particles removed. 
 
 
 18
3.2.3 Lubrication of gearbox on units with serial numbers smaller than 1000 
 
Remove gearbox guard exposing entire gearbox. The gearbox contains two threaded 
plugs. The two plugs are magnetic and are removed for oil draining and filling. The 
magnetic plugs attract metallic particles, in the lubricating oil. 
 
The oil level in the gearbox should be checked before centrifuge operation. Oil level 
is checked when plugs are 54° off vertical (See Figure A). Normal oil level is at the 
highest plug. After initial centrifuge operation the oil level should be checked weekly 
or whenever bearings are greased. The magnetic drain plugs should also be checked 
and metallic particles removed. 
 
 
 
 
 19
The gearbox oil should be changed after the first 150 hours of operation of a new 
gearbox and at least once a month of normal running. A large accumulation of 
metallic particles on the magnetic plugs indicates the gearbox oil needs changing. 
Changing gearbox oil involves flushing of the gearbox with diesel oil or kerosene. 
The gear box should be filled with diesel or kerosene and rotated a number of 
revolutions by hand with all plugs screwed in. This flushing should be repeated two 
to three times or until clean. The gearbox should be filled with on of the gear oils 
listed below. Gearbox capacity is approximately one-half (1/2) gallon or two (2) 
liters. Continued accumulation of metallic wear particles in the magnetic plugs 
indicates abnormal gear wear. 
 
 Chevron Universal Gear Lube SAE 80 W 90 
 Exxon Gear Lube G.X. 80 W 90 
 Gluf Multipurpose Gear Oil 80 W 90 
 Mobil Mobilube HD 80 W 90 
 Shell Spirax HD 80 W 90 
 Texaco Multigear E.P. Lube 80 W 90 
 Union Oil of California M. Gear Lube LF 80 W 90 
 
NOTE: Contact your nearest Swaco representative or service center for approval of 
gearbox lubricants not shown on the above list. 
 
3.3 Maintenance of Fluid Couplings - Item 171, Diagram 1 
 
 Gyrol Fluid Coupling Main Drive Motor Size Fill Angle 
11.5 25 Hp 45° from Straight up 
 
This coupling must be filled to the recommended oil level to deliver the proper 
amount of torque and not overheat from slippage. 
 
The oils approved for the use with Gyrol Fluid Couplings are listed below. 
 
 British Petroleum THB 32 
 Chevron OC Turbine Oil 32 
 Exxon Teresstic 32 
 Gulf Harmoney 32 
 Mobil DTE Light 
 Shell Tellus 32 
 Texaco/Regal R&O 32 
 Union Oil of California UNAX 150 
 
 
 20
3.4 Cleaning 
 
Cleaning and inspection should be done every 100 hours when bearings are 
lubricated. Cleaning may be needed more often when conditions are severe. 
 
3.4.1 With the cover open, hose down the inside of the vessel and the outside of the 
bowl. Pay particular attention to removing any solids buildup around the 
solids discharge bushings (See Item 86, Diagram 2). Also, remove solids 
buildup inside the cover. 
 
3.4.2 Inspect the solids discharge bushings for wear. Worn bushings should be 
replaced before any wear has damaged the bowl. See Figure 29 and 30 
 
3.4.3 Inspect wear shield in cover for excessive wear and replace if necessary. 
 
3.4.4 Inspect magnetic plugs in gearbox for metallic particles and check oil level. 
See Section 3.2.2 
 
3.5 Belt Tensioning 
 
 3.5.1 Belt tension should be checked routinely when lubricating bearings. 
 
3.5.2 The following procedure for belt tensioning should be used starting when a 
new 518 Centrifuge is put into service or anytime belts are replaced. 
 
 It is important that the belts are correctly tensioned. A belt that slips on its 
pulley is exposed to abnormal wear. If on the other hand the belts are too 
tight, this will cause wear on the bearings. 
 
 Proceed as follows to get the correct tension: 
 
1. Collect the belt slack on the upper side. Adjust the pulley center 
distance by moving the motor until the belts have a light tension. 
Rotate the drive parts a few turns by hand. 
2. Adjust the center distance so that all belts are lying well. Start the 
motor and run for approximately 10 minutes so that the belts can adapt 
themselves to the grooves. 
3. Stop the motor and adjust the center distance until all belts are lying 
evenly and are properly tightened. (A stretch of 1/2 - 1% of the belt 
length will not damage the belts) 
4. New belts should be retensioned every two hours during the first day 
of running. After this, further tightening may be unnecessary, as the 
length of the belts remains practically constant. When changing belts, 
 
 21
never force them over the side of the pulley. Always loosen the motor 
to install them. Over tensioning of belts may cause premature failure. 
 
5. When one or more of the belts is worn out, put on a COMPLETE set 
of new belts. 
 
6. A good way to check belt tension is to strike the belts with a clench 
fist. A slack belt will feel dead under this test, whereas a properly 
tensioned belt will vibrate and feel alive. Check the belt tension from 
time to time. See Figure 11 
 
Warning: Never run unit with belt guard removed and never check belt tension while 
unit is running. Such unsafe practices can result in injury or death. 
 
The working life and proper functioning of the belts depend to a high degree on how 
they are cared for. Oil and grease will soon ruin them. Oily or greasy belts can be 
cleaned with a good solvent. 
 
 
 
3.6 G.S. Coupling 
 
Solids overloading can cause excessive torque between the bowl and conveyor. This 
torque could damage the gearbox if the overload became too severe. 
 
 
 22
The 518 Centrifuge utilizes a spring loaded coupling to limit this torque. The torque 
is exerted on this coupling which is mounted next to the gearbox sheave. Should the 
torque exceed a preset limit, (50-60 ft/lb. (74.4-89.3 km)) the coupling will disengage 
and trip a limit switch (See Item 224, Diagram 1). This will shut off both the feed 
pump and main drive motor. The bowl should then be flushed with water to remove 
any excess solids left in the bowl. The procedure for resetting the G.S. coupling is 
discussed in the next paragraph. Continued coupling disengagements will require 
removal of bowl and conveyor for cleaning. 
 
Figure 12a illustrates the G.S. coupling in the engaged position. When excessive 
torque is exerted on the gearbox, the G.S. coupling disengages from the driver (Figure 
12b). The three balls of the coupling are forced out of the depressions in the driver an 
slide down the slopes of the driver. This causes the coupling and the driver to rotate 
60° in relation to each other. At the same time, the coupling moves 1/4" toward the 
driver. This movement trips the limit switch which removes power from the feed 
pump (when feed pump interlock is used) and the main drive motor. This movement 
also allows the cams on the V-belt pulley to be released from the slots in the coupling 
as shown in Figure 12b. The bowl and conveyor now rotate at the same speed. 
 
 
 
 23
 
3.6.1 Resetting the G.S. Coupling (Refer to Figures 12c and 12d) 
 
1. Insert a steel bar into a hole in the coupling and a bar in a slot 
in the driver. 
2. Rotate the bars in opposite directions until the steel balls return 
to original position. Be sure slots in the coupling line up with 
the cams on the V-belt sheave (See Figure 12c and 12d). If 
not, the coupling will not reset. 
3. Removebars and reset limit switch. The conveyor and bowl 
are now again coupled together. 
 
 3.6.2 Testing G.S. Coupling for proper release force (Refer to Figure 13) 
 
1. Place G.S. Coupling torque measuring adapter over coupling 
assembly. Insert pin in adapter hole through to the hole in the 
coupling. 
2. Place torque wrench socket fitting into socket on adapter. 
3. With G.S. Coupling engaged as in Section 3.6.1 turn clockwise 
and not torque reading at disengagement. Repeat four (4) 
times. Note smallest reading. This reading should be between 
50 and 60 ft.lbs (67.1-81.3 Nm). 
4. Repeat step 3 in the counterclockwise direction. Readings 
should be the same. 
 
 
 24
 3.6.3 Adjusting G.S. Coupling release force 
 
Some adjustment is possible by adding or removing spacer washers 
(Item 98, Diagram 5). Adding washers increases disengagement force 
and removing decreases force. If proper functioning and force 
readings cannot be obtained by washer adjustment, replace spring 
washer group, eleven (11) pieces, (Item 97, Diagram 5). 
 
 
 
 
 25
3.7 Vibration detection switch 
 
The high speed rotating assembly of the 518 Centrifuge requires near perfect balance 
for minimum vibration. Should an imbalance cause excessive vibration, the main 
drive motor and fee pump will be shut off by a vibration detection switch, See (Item 
223, Diagram 1). Excessive vibration is usually caused by a solids buildup within the 
bowl or uneven bowl and /or conveyor wear. The vibration detection switch is 
mounted on the centrifuge frame. Refer to Appendix for manufacturers information 
on the vibration switch. 
 
3.8 Fluid Coupling 
 
Bring the large rotating assembly to operating speed would normally take the main 
drive motor approximately 100 seconds. This would cause the motor to draw 
excessive current, overheat conductors, trip thermal protectors or overload the power 
plant. These problems are eliminated by a fluid coupling installed on the main drive 
motor shaft. The fluid coupling allows the motor to attain speed almost immediately 
while the bowl assembly is still accelerating. If excessive drag on the bowl causes 
greater than normal slip, the heat generated will cause a fusible plug in the coupling 
to melt. This will dump the hydraulic fluid in the coupling and unload the motor 
before any damage can be done. See Appendix for manufacturers information on the 
fluid coupling. 
 
3.9 Electrical System 
 
3.9.1 The electrical system on the 414 Centrifuge conforms to the National Electric 
Code requirements for Class 1, Division 2, Group D. 
 
3.9.2 The electrical system is shown in Diagram 11, Component Placement and 
wiring Diagram 12 and Schematic in Diagram 14, Cabling is shown in 
Diagram 13. These diagrams may be used to trace down individual 
components or wiring circuits. The use of these diagrams will greatly 
simplify trouble shooting electrical problems. 
 
 
 
 26
Section 4 Troubleshooting Chart 
 
Problem Cause Remedy 
Motors do not start 1. No power to unit 
2. Vibration switch not reset 
3. Limit switch on G.S. Coupling 
 tripped 
1. Restore power 
2. Reset vibration switch 
 Section 1.3.1 
3. Reset limit switch 
 Section 1.3.1 
Startup and shutdown 
vibration 
1. Moderate vibration at critical 
 rpm during startup and shutdown 
1. None required 
Machine vibrates 1. Bowl may be out of balance due 
 to poor cleaning, bowl parts 
 interchanged with another bowl 
 or uneven wear on conveyor or 
 bowl. 
2. Vibration damping mounts have 
 lost elasticity. 
1. Determine if vibration is 
 due to the causes described. 
2. Replace rubber mounts. 
Fluid coupling plug melts 1. Excessive amount of solids 
 causing overloading 
2. Fluid volume or type wrong. 
1. Reduce feed rate 
2. Check oil level in coupling 
3. Replace oil if in doubt 
Noise from gearbox 1. Oil volume low or type wrong 
2. Worn gears 
3. Worn bearings 
1. Check oil level and oil 
 type, replace if in doubt 
2. Replace gearbox 
3. Replace bearings 
Continued disengagement 
of G.S. Coupling 
1. Large accumulation of solids in 
 bowl. 
2. Excessive amount of solids in 
 feed mud. 
1. Flush bowl 
2. Reduce feed rate 
Solids discharge too wet 1. Feed rate too high 
2. Conveyor differential too high 
1. Decrease feed rate 
2. Change back drive motor 
 sheave to reduce differential 
 See Diagram 1 
 
NOTE 
 
THE ABOVE DESCRIBED ITEMS ARE NOT TO BE CONSIDERED CONCLUSIVE. IF 
YOU HAVE ANY QUESTIONS, CONTACT SWACO ENGINEERING, HOUSTON, 
TEXAS, 281-988-1868 
 
 
 27
Section 5 Repair and Overhaul 
 
 5.1 Rotating assembly removal 
 
The following procedure is for removal of the rotating assembly. Remember 
the bearing housings are aligned for each centrifuge frame and should never 
be interchanged. 
 
 1. Open vessel cover. 
 2. Remove the following parts: 
a. Bolts from bearing housing cap. 
b. Belt guards, belts and feed tube. 
3. Carefully lift the bowl assembly using a hoist and nylon sling. 
 Set bowl on a wooden pallet to prevent rolling. Parts which are 
 Removed should be placed in a clean area to facilitate cleaning 
 and inspection. 
 
5.2 Rotating assembly 
 
 5.2.1 Correct Bearing Alignment 
 
The rotating assembly is mounted on two pillow block bearings which are 
specially aligned. A special alignment shaft is used to align the pillow block 
housings to the centrifuge frame. This bearing alignment must be performed 
in Swaco Assembly Shop, in Florence KY. 
 
NOTE 
 
BOWLS CAN BE SWITCHED FROM ONE FRAME TO ANOTHER 
ONLY WHEN THE PILLOW BLOCK HOUSINGS REMAIN WITH EACH 
CENTRIFUGE FRAME. WORN BEARINGS CARTRIDGES MAY BE 
REPLACED. 
 
PILLOW BLOCKS CONTAIN RANDOMLY LOCATED ALIGNMENT 
PINS THEREFORE A GIVEN SET OF PILLOW BLOCK HOUSINGS 
WILL ONLY FIT THE ORIGINAL FRAME AS DELIVERED. 
 
 
 28
TAPERED ALIGNMENT PINS ARE USED TO ASSURE PERFECT 
ALIGNMENT OF BEARING HOUSINGS, IF BEARING HOUSINGS 
HAVE BEEN REMOVED. ALWAYS INSERT THE ALIGNMENT PINS 
BEFORE TIGHTENING BEARING HOUSING BOLTS. 
 
 
 
 29
 
 
 30
The following sections discuss the dismantling of the rotating assembly. Parts illustrated in 
the figures are numbered and parenthesized in the instructions. 
 
 
5.2.2 Removal 
 
 The procedure for removing the gearbox is as follows: 
 (Refer to Figure 15 and 16 for illustrations) 
 
 1. Remove the screws (6) connecting the gearbox to the bowl flange (5). 
 2. Screw in the two screw plugs (7) and back off gearbox from bowl flange (5). 
 3. The drive shaft (48) of the gearbox is loose on both ends. Be careful not to drop 
 shaft when removing the gearbox. 
 
5.2.3 Disassembly gearbox end 
 
The procedure for disassembling the gearbox end of the rotating assembly is as 
follows. (Refer to Figure 16) 
 
1. Remove the 16 screws (29) holding the end piece (27) to the bowl. 
 Remove the 4 screw plugs (28). The end piece is removed from the bowl 
 by screwing 4 screws (29) into the screw plug holes and backing off. Care 
 should be taken to protect the roller bearing inner race (31) and the lip seal 
 ring (30). 
2. Remove the round nut (1) with pin spanner. Figure 17a illustrates pin spanner. 
 
 
 31
3. Remove the flange (5) facing the gearbox, using the puller if necessary. Figure 
 17b illustrates flange removal. 
 
4. The labyrinth ring (10), roller bearing outer race (13), and spacing ring (15) can 
 be removed by hand. The roller bearing inner race can be removed with the 
 special puller tool (P/N: 96-01-036) as shown in Figure 18. The puller tool is 
 needed since the roller andneedle bearing inner races are press fitted. The 
 tool consists of a metal clamp ring with four attaching screws. Push the clamping 
 ring on the inner race and clamp tool tight with screws contacting inner edge of 
 bearing race. Using the puller as shown, pull the inner race from the bowl end 
 piece. Refer to Figure 18 for illustration. 
 
 
 32
5. The fat valve disc (17) is removed after removing the bearing inner race. If 
 the fat valve disc has seized to the end piece (27), remove by using the puller 
 as shown in Figure 19. The claws of the tool should seat against the bearing 
 removal tool. (P/N: 96-01-035) 
 
5.2.4 Conveyor Removal 
 
It is necessary to remove the conveyor for replacement of bearings and seals. 
Conveyor removal is also necessary to inspect for unusual conveyor wear or 
imbalance. The following procedures discuss conveyor removal. 
 
1. Remove the gearbox and end piece as discussed in Section 5.2.2, 5.2.3 - Item 
1. 
2. After removing the gearbox and end piece, the conveyor can be partly pried 
out. The conveyor can be completely removed using a hoist as shown in 
Figure 20. 
3. Remove feed end piece to facilitate easier assembly of conveyor. See Section 
5.2.8 for feed end piece disassembly. 
 
 
 
 33
 
 
5.2.5 Assembly gearbox end 
 
Assemble the parts in sequence as shown in Figure 16. Observe the following when 
assembling. 
 
The lip seal ring (30) of the large conveyor bearing must be mounted on the 
end piece pivot before mounting the roller bearing inner race (31). Apply ball 
bearing grease to the lip seal ring. Lubricate the roller bearing with grease 
listed in Section 3.2.1. 
 
5.2.6 Disassembly large conveyor bearing 
 
 The procedure for disassembling the large conveyor bearing is as follows: 
 Refer to Figure 21 for identification of parts. 
 
1. Prior to disassembly, the bearing holder flange (37) and the conveyor edge 
should be indexed with a center punch to facilitate alignment when 
reassembling. 
 
 
 34
2. Remove the screw (38), and set screw plugs (36) from the bearing holder (37). 
The bearing holder is removed by screwing two jacking screws (P/N: 84-01-
460) into the screw plug threads (36) and backing off. The o-ring (14), roller 
bearing (31), and snap ring (40) can now be removed. The snap ring (32), o-
ring (33), seal lining (34), and lip seal ring (35) may also be removed for 
inspection. 
3. Using the special T-handle screw (P/N: 96-01-006), Figure 21, back out the 
thrust ring (41), angular contact ball bearings (42), ball bearing holder (43) 
and ejector disc (46). Inspect parts and replace if necessary. Figure 18 
illustrates the large conveyor bearing and part removal procedure. 
 
4. Item (44) shim is used to adjust axial clearance. None, one or more shims 
may be found upon disassembly. You should reassemble using same number 
and thickness shims as originally installed. When replacing a conveyor, shims 
needed should be determined as shown in Diagram 9. 
 
5.2.7 Assembly Large Conveyor Bearings 
 
Assemble the parts in sequence as shown in Figure 21. Observe the following when 
assembling. 
 
Fill the ball bearing holder (43) with ball bearing grease before installing the angular 
contact ball bearing (42) faces the gearbox. If the ball bearing holder (43) cannot be 
pushed into its seat by hand, use a pipe for a drift and gently tap it in. Be sure the 
bearing holder bottoms out. 
 
The parts should be assembled in the bearing holder (37) in the following order. 
 
 a. Roller bearing outer race (31) with rollers. 
 b. Snap ring (40) facing roller bearing. 
c. Lip seal ring (35) in seal lining (34). Be sure lip seal ring is turned 
outward. 
d. O-ring (33) in groove of seal lining (34). 
e. Seal lining (34) in bearing holder (37). 
f. Snap ring (32) facing seal lining. 
g. O-ring (14) in groove of bearing holder (37). 
 
Apply ball bearing grease to the sealing lip of the seal ring. Apply enough grease around the 
seal lining so the annular space between the lip seal ring of the lining and the end piece (27) 
will be filled with grease in final assembly. 
 
 35
 
 
 
 36
 
 
 
 37
5.2.8 Disassembly Feed End 
 
 The procedure for disassembling the feed end of the rotating assembly is as follows. 
 Refer to Figure 22 
 
1. Remove the screws (64) holding the end piece (67) to the bowl. The end 
piece is removed from the bowl by screwing two of the removed screws into 
the screw plug (65) threads and backing off the end piece. Care should be 
taken to protect the roller bearing (54) and the lip seal rings (30/35). 
 
2. Remove the round nut (85) with pin spanner shown in Figure 23. Remove the 
V-belt pulley (82). The puller, shown in Figure 24, may be needed to remove 
pulley. 
 
 
3. Loosen the labyrinth ring (79) and screws (80). Remove the inner labyrinth 
ring (10) and labyrinth ring (79) by hand. 
 
 
 38
4. Remove the fat valve disc (17), spacing ring (75), ball bearing (77) and 
spacing sleeve (81) with puller as shown in Figure 25. The claws of the puller 
should rest against the bearing removal tool (P/N: 96-01-035). Difficulty in 
removing these parts indicates the spacing sleeve (81) has seized. If so, pull 
spacing sleeve off by inserting the puller claws in the groove of the spacing 
sleeve. 
 
5. To remove the needle bearing inner race (54) use the puller tool as discussed 
in Section 5.2.3. The snap ring (59), and lock ring (60) need removal for 
needle bearing inner race removal. 
 
5.2.9 Assembly Feed End 
 
Assemble the parts in sequence as shown in Figure 22. Observe the following when 
assembling. 
 
 1. Apply ball bearing grease to the sealing lip of the lip seal ring (30). 
2. Install needle bearing inner race by heating as described in Section 
5.2.4. 
3. Heat pillow block ball bearings (77) in oil before installing on the end 
piece pivot. Lubricate the ball bearings with grease. See Figure 3.2 
 
5.2.10 Disassembly Small Conveyor Bearing 
 
The procedure for dismantling the small conveyor bearing is as follows. Refer to 
Figure 22. 
 
 
 39
 1. Remove screws (58). Remove the tapered lock ring (57). 
 2. Using the jack screws (P/N: 96-01-011) ease out the ejector disc (52). 
 
3. If necessary the protecting tube (50) can be removed. Inspect parts 
carefully and replace if necessary. 
 
5.2.11 Assembly Small Conveyor Bearing 
 
 The procedure for assembling the small conveyor bearing is as follows. 
 Refer to Figure 22. 
 
1. If the protecting tube (50) was removed, a new o-ring (49) should be 
installed. Apply grease on the o-ring before installation. 
2. Install the ejector disc (52) observing alignment of pin on flange of 
protected tube (50). 
3. Install shims (53) the number and thickness as those removed. 
4. Install the bearing outer race (54). 
5. Apply grease on o-ring (33). Install o-ring in the groove of the bearing 
cavity of the conveyor. 
6. Install a new lip seal ring (35) in the seal lining (56). Check that 
sealing lip is turned the correct way. 
7. Install the seal lining (56) by pressing it evenly into its seat. The seal 
lining should be pressed in straight to prevent damage to the o-ring. 
Use drift tool (P/N: 96-01-027) to press seal lining into conveyor. See 
Figure 27. 
 
 
 40
 
 
 
 8. Install the lock ring (57). 
 9. Apply grease to the sealing lip of the lip seal ring. Apply enough 
grease to entirely fill the annular space between the lip seal ring and 
end piece when assembled. 
 
5.3 Bowl 
 
 5.3.1 Level Regulating Disc (Overflow dams) 
 
The level regulating discs are shown in Figure 28. The discs are mounted to 
the end piece by three screws.In the 414, discs are used to give a pool radius 
of 4.52 inch (115 mm) or 4.92 inch (125 mm) and are so marked. 
 
 
 41
 5.3.2 Solids Discharge Bushings 
 
The discharge bushings should be replaced before wear is allowed on the bowl. To 
remove discharge bushings use a soft drift and a hammer to tap out as shown in 
Figure 29. 
 
Replace bushings in pairs only. Replace the defective bushings and the one opposite 
it. 
 
To install discharge bushings, clean outer surface of new bushings and inner surface 
seats of the bowl. Apply a thin layer of loctite 270 to the surface of the discharge 
bushings. Insert bushings into the seat and turn until the loctite is uniformly 
distributed. Press bushing tightly into place. Handling strength is obtained after 20 
minutes and maximum strength after 3 hours. Refer to Figure 30 for installation. 
 
 
 42
 
 
5.4 Conveyor 
 
 5.4.1 Shimming 
 
When installing a new conveyor in a bowl it is necessary to obtain the correct 
clearance between the edge of the conveyor flights and the bowl, in the conical end. 
It is also necessary to obtain the correct axial clearance between the bowl and the 
conveyor. This is done by the use of shims or adjusting rings inside the bearing 
cavity in each end of the conveyor. When bearings and/or seals are changed in a 
conveyor, the existing shims should be reused. If these shims have been damaged in 
any way, the same size and number of new shims should be used. See Diagram 9 for 
determining the shims required. 
 
 5.4.2 Installation 
 
 1. Bolt the small end piece, Item 67, Figure 22 to the bowl. 
2. Insert the conveyor into the bowl, taking care as the protector tube 
slides through the end piece. 
3. Bolt the large end piece, Item 27, Figure 16, to the bowl. If the 
gearbox flange, Item 5, Figure 16, has been removed, proceed as 
follows. 
 
 
 43
 
a. Clean any dirt and grease from the mating surfaces of the large 
end piece and the flange. Remove any residual Loctite from 
the splined surfaces of the end piece and the flange. 
b. Apply an even coat of Loctite 225/222 on the end piece splines. 
Install the flange on the end piece. 
c. Install lockwasher, Item 2, and the round nut, Item 1, Figure 
16. 
 
NOTE: The flange face that bolts to the gearbox must run true to 
prevent any gearbox runout. 
 
Section 6: Diagrams and Parts Lists 
 
1. 518 Centrifuge 
2. Bowl Assembly 
3. Gearbox End Assembly 
4. Feed End Assembly 
5. G.S. Coupling 
6. Frame 
7. Vessel 
8. Conveyor 
9. Shim Selection 
10. 350 KPM Gearbox 
11. Electrical Assembly 
12. Electrical Wiring Diagram 
13. Electrical Cabling 
14. Electrical Schematic Diagram 
15. Feed Pump Electrical Diagram (Typical) 
16. Special Tools 
 
 
 44
 
 
 
 
Diagram 1 (518 Centrifuge) 
 
 
 
 45
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
76 65-92-328 Terminal Wire 1/0 AWG Ring 2 
87 80-73-868 Strap, Braided Scotch 2 
124 13-05-393 Nut, Lock Cad Plt. 1/2"-13 4 
165 96-10-032 Skid 518 Centrifuge 1 
166 96-10-034 Guard, Belt, Feed Tube End 1 
167 96-10-035 Guard, Belt, Backdrive End 1 
168 96-10-379 Guard, Gearbox 1 
169 05-30-117 Bushing 1-3/8" Bore 1 
170 05-79-096 Sheave 1 
171 31-05-265 Coupling, Drive, Gyrol Size 11.5 1 
172 96-10-414 Step Sheave, Motor (4-3V-10.6/4-3V-8.0) 1 
 96-10-417 Step Sheave, Motor (4-3V-12.3/4-3V-9.6) 1 
173 96-10-394 Motor Mount Base 25 Hp 1 
174 96-10-395 Motor Mount Base 7-1/2 Hp 1 
175 50-30-089 Ell, Galv.,2" NPT x 1-1/2" NPT 1 
176 96-10-104 Bracket, Limit Switch 1 
177 12-20-061 Stud, 3/4" x 10 NC x 5-1/2" GR. 8 1 
178 13-05-015 Nut, Hex Blk. 3/4" x 10 NC 2H 8 
179 58-59-347 Mount, Shock 4 
180 58-95-175 Washer, Head 4-1/4" O.D. 4 
181 58-95-176 Washer, Tail 3" O.D. 4 
182 05-06-114 Belt, 3V-850 Main Drive 4 
183 05-06-126 Belt, 3V-1000 Backdrive 2 
184 05-06-119 Belt, 3V-900 Main Drive 4 
185 96-10-429 Feed Tube, Standard 1 
186 96-50-350 Decal Warning, Shipping 2 
187 84-20-207 Decal Swaco 3 
188 96-50-345 Decal (Caution), Belt Guards 2 
189 96-50-363 Decal Wiring Hookup 414/518 1 
190 96-50-361 Decal Sheave Speed Change 1 
191 96-50-344 Decal (Caution), On Cover 1 
192 13-45-092 Washer, Flat Cad. Plt. 5/8" 
193 13-45-088 Washer, Flat Cad Plt. 3/8" 56 
194 13-45-090 Washer, Flat Cad Plt. 1/2" 4 
195 13-45-087 Washer, Flat Cad Plt. 5/16" 2 
196 13-45-086 Washer, Flat Cad Plt. 1/4" 2 
197 13-45-389 Washer, Lock Cad Plt. 1/4" 6 
198 13-45-212 Washer, Lock Cad Plt. 3/8" 10 
199 13-05-571 Nut, Hex Cad Plt. 1/4"-20 2 
200 13-05-391 Nut, Lock Cad Plt. 3/8"-16 30 
 
Diagram 1 (414 Centrifuge Parts List) 
 
 46
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
202 13-05-395 Nut, Lock Cad Plt. 5/8"-16 10 
203 14-54-003 Screw, Hex Head Cap Cad Plt. 1/4"-20 x 5/8" 10 
204 14-07-054 Screw, Hex Head Cap Cad Plt. 1/4"-20 x 1" 6 
205 14-07-086 Screw, Hex Head Cap Cad Plt. 3/8"-16 x 1-3/4"" 8 
206 14-07-066 Screw, Hex Head Cap Cad Plt. 5/16"-18 x 3/4" 2 
207 84-01-447 Screw, Hex Head Cap Cad Plt. 10 mm x 30 mm 6 
208 14-07-140 Screw, Hex Head Cap Cad Plt. 5/8"-11 x 2-1/4" 6 
210 13-05-039 Nut, Hex Cad Plt. 1/2"-13 4 
211 13-05-037 Nut, Hex Cad Plt 3/8"-16 4 
212 13-45-342 Washer, Lock Cad Plt. 1/2" 4 
213 13-45-345 Washer, Lock Cad Plt. 3/4" 8 
214 13-45-344 Washer, Lock Cad Plt. 5/8" 4 
215 96-50-367 Plate, Rotation Indicator 1 
220 69-12-050 Motor, 230/460V 60C 25 Hp 1750 rpm 1 
 69-20-023 Motor, 575V 60 Hz 25 Hp 1450 rpm 1 
 69-05-126 Motor, 190/380V 50 Hz 25 Hp 1450 rpm 1 
223 75-79-569 Switch, Vibration, Main Reset Robertshaw 365 D 0 1 
224 75-69-011 Switch, Limit x Plsn Proff #LSXA3K 1 
231 96-09-252 Box Hr Meter w/ Mounting Posts 1 
232 24-80-050 Meter, Elapsed Time, 60-260V (AC-DC) 1 
 24-80-063 Meter, Elapsed Time, 120V 50 Hz 1 
235 96-12-018 Motor, 230/460V 60C 7.5 Hp 1750 rpm 1 
 69-20-010 Motor 575 60 Hz 7.5 Hp 1750 rpm 1 
 69-05-029 Motor 190/380V 50 Hz 7.5 Hp 1450 rpm 1 
 
Diagram 1 (518 Centrifuge Parts List) 
 
 
 
 47
 
Diagram 2 (518 Centrifuge Bowl Assembly) 
 
 
 48
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
11 28-40-015 Grease Fitting 2 
25 96-10-392 Cleaning Plug 2 
26 84-01-324 O-ring 2 
27 96-10-149 Large End Piece 1 
28 84-01-360 Screw 4 
29 84-01-462 SHCS, SS M6 x 12 mm 16 
51 84-01-350 Pin 3 
58 84-01-452 SHCS, SS M6 x 12 mm 12 
62 84-01-372 Pin, Dowel, SS, 6 x 10 mm 1 
64 84-01-458 SHCS, SS, M10 x 25 mm 8 
65 84-01-357 SHSS, SS, M10 x 16 mm 2 
67 96-10-142 Small End Piece 1 
68 96-10-316 Bushing 1 
83 84-01-269 Key 1 
86 96-10-319 Discharge Bushing 16 
88* 96-10-249 Overflow Dam 115m 4 
89 96-10-309 Bowl Section, Cylindrical 1 
90 84-01-460 SHCS, SS, M10 x 40 mm 48 
91 96-10-307 Bowl Section, Conical 1 
92 14-93-335 SHCS, SS, M8 x 25 mm 1 
 
Diagram 2 (518ntrifuge Bowl Assembly Parts List) 
 
* = 96-10-248 Overflow Dam 125 mm (SPECIAL ORDER) 
 
 
 
 49
 
 
Diagram 3 (518ntrifuge Gearbox End Assembly) 
 
 
 50
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
1 84-01-298 Round Nut 80 mm 1 
2 84-01-870 Lock Washer 80 mm 1 
3 96-10-315 Bushing 1 
4 84-01-370 Pin, Grooved 5/16 x 1 inch 1 
5 96-10-148 Flange 1 
6 84-01-972 SHCS, SS, M16 x 30 mm 6* 
7 84-01-964 SHSS, SS, M12 x 15 mm 3 
8 84-01-520 SHCS, M12 x 90 mm 4 
9 96-10-431 Washer Spacer 4 
10 96-10-399 Ring Labyrinth 1* 
11 28-40-015 Grease Fitting 2 
12 96-10-145 Bearing Housing 1 
13 84-01-034 Cylindrical Roller Bearing SKF NU 1020 M/C3 1 
14 84-01-336 O-ring 1 
15 96-10-403 Spacer Ring 1 
16 84-01-322 Lip Seal Ring 2 
17 96-10-354 Fat Valve Disc 1 
20 96-10-398 Guard Ring 1 
21 96-10-352 Deflector 1 
23 84-01-310 O-ring 1 
25 96-10-392 Cleansing Plug 2 
26 84-01-324 O-ring 2 
27 96-10-149 End Piece 1 
28 84-01-360 SHSS,, SS, M10 x 25 mm 4 
29 84-01-462SHCS, SS, M10 x 45 mm 16 
30 84-01-443 Lip Seal Ring 1 
31 84-01-031 Cylindrical Roller Bearing SKF NU 216 1 
32 84-01-433 Snap Ring 1 
33 84-01-421 O-ring 1 
34 96-10-411 Seal Lining 1 
35 84-01-405 Lip Seal Ring 1 
36 84-01-991 SHSS, SS, M10 x 12 mm 2 
37 96-10-377 Bearing Holder 1 
38 84-01-454 SHSS, SS, M8 x 20 mm 6 
40 84-01-431 Snap Ring 1 
41 96-10-406 Thrust Ring 1 
42 84-01-023 Ball Bearing SK 7316B 1 
43 96-10-378 Ball Bearing Holder 1 
 
Diagram 3 (518 Centrifuge Gearbox End Assembly Parts List) 
 
 
 51
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
44a 96-10-418 Shim 1 
44b 96-10-421 Shim 1 
45 84-01-374 Pin 4 
46 96-10-359 Ejector Disc 1 
47 84-01-968 SHCS, SS, M6 x 40 mm 3 
69 84-01-476 SHCS , SS, M5 x 8 mm 1 
 
 
 
 
 52
 
 
 
Diagram 4 (518 Centrifuge Feed End Assembly) 
 
 
 53
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
8 84-01-520 SHCS, M12 x 90 mm 4 
9 96-10-431 Washer Spacer 4 
10 96-10-399 Ring Labyrinth 1 
11 28-40-015 Grease Fitting 2 
14 84-01-336 O-ring 1 
16 84-01-322 Lip Seal Ring 1 
17 96-10-354 Fat Valve Disc 1 
20 96-10-398 Guard Ring 1 
23 84-01-310 O-ring 1 
30 84-01-443 Lip Seal Ring 1 
33 84-01-421 O-ring 2 
35 84-01-405 Lip Seal Ring 1 
49 84-01-332 O-ring 1 
50 96-10-380 Protecting Tube 1 
51 84-01-350 Pin 1 
52 96-10-360 Ejector Disc 1 
53a 96-10-419 Shim 1 
53b 96-10-420 Shim 1 
54 84-01-027 Needle Bearing INA 85/26 1 
56 96-10-410 Seal Lining 1 
57 96-10-345 Lock Ring 1 
58 84-01-452 SHCS, SS, M6 x 12 mm 8 
59 84-01-429 Snap Ring 1 
60 96-10-401 Lock Ring 1 
62 84-01-372 Pin 1 
64 84-01-458 SHCS, SS, m10 x 25 mm 8 
65 84-01-357 SHSS, SS, M10 x 16 mm 2 
66 84-01-993 Screw, Drive 2 
67 96-10-142 End Piece w/Bushing 1 
68 96-10-316 Bushing 1 
69 84-01-476 SHSS, SS, M5 x 8 mm 2 
70 96-10-351 Deflector 1 
75 96-10-405 Spacing Ring 1 
77 84-01-020 Ball Bearing SKF 6218 M/C4 1 
78 96-10-144 Bearing Housing 1 
79 96-10-400 Ring Labyrinth 1 
81 96-10-425 Spacing Sleeve 1 
82 96-10-416 Step Sheave (4-3V-5.6/4-3V-7.4) 1 
 
Diagram 4 (518 Centrifuge Feed End Assembly Parts List) 
 
 
 54
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
83 84-01-269 Key 1 
84 84-01-860 Lock Washer 90 mm 1 
85 84-01-300 Round Nut 90 mm 1 
87 84-01-371 Dowel , SS, M5 x 18 mm 1 
 
Diagram 4 (518 Centrifuge Feed End Assembly Parts List) 
 
 
 
 55
 
 
Diagram 5 (518 Centrifuge G.S. Coupling 350 KPM Gearbox) 
 
 
 56
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
93 84-01-970 SHCS, BLK, M8 x 20 mm 5 
94 96-10-430 Washer 1 
95 96-10-357 Driver 1 
96 96-10-140 Coupling Assy. 1 
97 84-01-884 Spring Disc. 11 
98 84-01-891 Washer 7/8 x 1-11/64 1* 
99 96-10-334 Clamp Ring Driver Brass Back Drive Cent. 1 
100 96-10-408 Screw 3 
101 84-01-428 Snap Ring 1 
102 84-01-036 Ball Bearing 2 
103 96-10-369 Ring Spacer 1 
104 96-10-415 Sheave 1 
105 96-10-365 Adapter Sheave 1 
106 84-01-369 Pin 1 
107 96-10-130 Gearbox 1 
108 84-01-485 SHCS, SS, M8 x 30 mm 4 
 
* Refer to Section 3.6.3 for quantity used. 
 
Diagram 5 (518 Centrifuge G.S. Coupling 350 KPM Gearbox Parts List) 
 
 
 
 
 57
 
 
Diagram 6 (518 Centrifuge Frame) 
 
 
 58
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
8 84-01-520 SHCS, BLK., M12 x 90 mm 8 
9 96-10-431 Washer Spacer 8 
11 28-40-015 Grease Fitting 1 
12 96-10-145 Bearing Housing 1 
73 96-10-304 Frame 1 
78 96-10-144 Bearing Housing 1 
110 96-10-384 Conical Pin 2 
111 84-01-292 Nut Hex Plt. M12 2 
112 84-01-466 SHCS, PLT., M16 x 65 mm 4 
113 84-01-872 Clamping Washer 1 
114 96-10-312 Welded Bracket 1 
115 14-07-529 SHCS, SS, 1/2-13 NC x 2-3/4 4 
163 84-01-447 SHCS, SS, M10 x 30 mm 6 
164 96-10-383 Pin 2 
 
Diagram 6 (518 Centrifuge Frame Parts List) 
 
 
 
 
 59
 
 
 
Diagram 7 (518 Centrifuge Vessel) 
 
 
 60
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
116 96-10-372 Gasket 1 
117 84-01-350 Pin 2 
118 84-01-464 SHCS, PLT., M12 x 35 mm 4 
119a 
119b 
96-10-107 Vessel 1 
120 14-07-467 SHCS, SS, 5/8-13 x 2-3/4 4 
121 84-01-464 SHCS, SS, M12 x 35 mm 4 
122 96-10-396 Protecting Cover 1 
123 96-10-385 Hinge Pin 2 
124 13-05-404 Nut Lock SS 5/8-13 NC 4 
 
Diagram 7 (518 Centrifuge Vessel Parts List) 
 
 
 
 61
 
 
Diagram 8 (518 Centrifuge Conveyor) 
 
 
 62
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
125 96-10-338 518 Conveyor (110 mm) 1 
 
Diagram 8 (518 Centrifuge Conveyor Parts List) 
 
 
 
 63
 
 
 
Diagram 9 (518 Centrifuge, Method for determing adjusting shims) 
 
 
 64
 
Table 1 
Difference 
(a-b) mm In. Qty. Part No. Tmm 
11.0-11.9 .43-.47 0 
12.0-12.9 .47-.51 1 96-10-418 1 
13.0-13.9 .51-.55 1 96-10-421 2 
14.0-14.9 .55-.59 1 96-10-418 
 1 96-10-421 3 
15.0-15.9 .59-.63 2 96-10-422 4 
 
Table 2 
Difference 
(9.4 + d)-e mm 
(.370 + d)-e In. 
Mm In. 
Qty. Part No. Tmm 
0-0.4 0-.016 1 96-10-419 1 
0.5-0.9 .02-.035 1 96-10-420 1.5 
1.0-1.4 .04-.06 2 96-10-419 2 
 1 96-10-419 
1.5-1.9 .06-.075 1 96-10-420 2.5 
 
Table 3 Shim Thickness 
Gearbox end of conveyor Part No. Tmm 
96-10-418 1 
96-10-421 2 
 
96-10-419 1 
Feed End of Conveyor 
 
96-10-420 1.5 
 
 
Adjustment of space between conical part of bowl and conveyor and axial clearance between 
bowl and conveyor. 
 
1. In addition to normal procedure when changing conveyor, remove the small end 
piece. 
2. Place the conveyor in the bowl shell so that it touches the cone. 
3. Measure the distances a,b,d and e as shown in Diagram 9. 
4. Calculate the difference a-b and find in Table 1 the adjusting shim or shims to be 
placed at position T between the conveyor big end bore and the bearing arrangement 
to give the right space. 
5. Calculate the difference (9.4 + d) - e mm and find in Table 2 the adjusting shim or 
shims to be placed at position (t) between the conveyor small end bore and the 
bearing arrangement to give the right axial space between conveyor and bowl. 
 
Diagram 9 (518 Centrifuge Method for determing adjusting shims) 
 
 
 65
 
 
Diagram 10 (518 Centrifuge 350 KPM Gearbox) 
 
 
 66
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
108 96-10-366 Grease Nipple (Nave) 1 
126 84-01-485 SHCS, SS, M8 x 33 mm 4 
127 84-01-404 Ring Seal 1 
128 84-01-408 Ring Snap 2 
129 84-01-052 Bearing, Ball SKF 6005 2RS 1 
130 96-10-434 Wheel, Sun Small 1 
131 96-10-343 Cover, Sun Wheel End 1 
132 84-01-325 O-ring 1 
133 84-01-335 O-ring, Cover 2 
134 96-10-374 Holder, Gear Pivot, Gear #1 1 
135 96-10-432 Wheel, Planetary 4 
136 96-10-317 Bushing, Bronze Gear, Gear #1 4 
137 96-10-388 Pivot, Planetary Gear #1 4 
138 96-10-375 Holder, Gear #1 1 
139 96-10-038 Bearing, Ball SKF 16003 1 
140 96-10-382 Housing, 350 KPM Gearbox 1 
141 96-10-393 Plug, w/ Magnet 2 
142 90-60-279 Seal, Plug 2 
143 84-01-454 SHCS, M8 x 20 mm 10 
144 84-01-461 SHCS, M6 x 16 mm 56 
145 84-01-024 Bearing, Ball SKF 16012 1 
146 84-01-966 SHSS, M8 x 10 mm 4 
147 84-01-048 Bearing, Ball Gear #11 1 
148 96-10-376 Holder, Pivot Gear #11 1 
150 96-10-433 Wheel, Planetary Gear #11 3 
151 96-10-318 Bushing, Bronze Gear, Gear #11 3 
152 96-10-389 Pivot, Gear #11 3 
153 84-01-046 Bearing, Ball SKF 16004 1 
154 96-10-373 Holder, Gear #11 1 
156 84-01-333 O-ring 1 
157 96-10-342 Cover, Drive Shaft End 1 
160 84-01-485 SHCS, M8 x 30 mm 10 
161 84-01-025 Bearing, Ball SKF 16017 1 
162 96-10-412 Shaft, Drive 1 
 
 
Diagram 10 (518 Centrifuge 350 KPM Gearbox Parts List) 
 
 
 67
 
Diagram 11 (518 Centrifuge Electrical Assembly) 
 
 
 68
 
Index 
No. 
Swaco 
Part No. 
Description Qty. 
216 96-10-362 Box, Curlee 1 
217 80-16-100 Drain, Breather 1/2" NPT (Reference)2 
218 79-06-215 Cable, 4/C 10 AWG Itt Surprenant "Exane" Type 
TC Armoured 
10 
219 79-06-221 Cable, 3/C 14 AWG Itt Surprenant "Exane" Type 
TC Armoured 
12 
220 69-12-050 Motor, 230/460V 60C 25 Hp 1750 rpm 1 
 69-20-023 Motor, 575V 60 Hz 25 Hp 1750 rpm 1 
 69-05-126 Motor, 190/380V 50 Hz 25 Hp 1450 rpm 1 
221 75-73-324 Switch, Pushbutton Start-stop (Reference) 1 
222 75-73-290 Actuator, Reset (Reference) 2 
223 75-79-569 Switch 1 
224 75-69-011 Switch, Limit Explosion Proof #LAXA3K 1 
225 93-89-007 Arm, Roller Adjustable #LSZ-52KC 1 
226 65-60-161 Terminator Cable 10/4 Arm BICC 3/4 NPT 4 
227 65-60-059 Terminator Cable 14/3 ARM BICC 1/2 NPT 4 
228 65-60-275 Terminator Cable 6/4 ARM BICC 1-1/4 NPT 1 
229 31493 Seal 1" EYS 3C-H 1 
230 30221 Nipple, Electrical 1" X Close 2 
231 96-09-252 Box HR Meter w/mounting Posts 1 
232 24-80-050 Meter, Elapsed Time, 60-260V (AC-DC) 1 
 24-80-063 Meter, Elapsed Time, 120V 50 Hz 1 
233 96-10-361 Box, Curlee 1 
234 75-73-320 Switch, Push Button Start XPRF (Reference) 1 
235 69-12-018 Motor, 230/460V 60C 7.5 Hp 1750 rpm 1 
 69-20-010 Motor, 575V 60 Hz 7.5 Hp 1750 rpm 1 
 69-05-029 Motor, 190/380V 50 Hz 7.5 Hp 1450 rpm 1 
252 96-10-391 Lid (Hour Meter) 1 
 
 
Diagram 11 (518 Centrifuge Electrical Assembly Parts List) 
 
 
 
 69
 
Diagram 12 (518 Centrifuge Wiring Diagram) 
 
 70
 
 
 71
 
Index 
No. 
Swaco Part 
No. 
Description Qty. 
221 75-73-324 Switch, Push Button Start-Stop (Reference) 1 
222 75-73-290 Actuator, Reset (Reference) 2 
236 75-84-005 Starter, Culter Hammer, AE16JNO 1 
237 69-45-198 Heater, Culter Hammer, H2014-3 (Set of 3) 1 
238 96-10-047-01 Transformer Control Micron 1 
 96-10-047-04 Transformer Control Nicron 1 
 77-17-083 Transformer Control 1 
239 75-19-600 Holer, Fuse 3 ph Buss #2809 1 
240 80-06-063 Channel, Mntg A-B #1492-N22 (5-5/8" lg.) 1 
241 65-90-003 Block, Terminal A-B #1492-CD211 11 
242 80-04-016 Barrier, End TB A-B #1492-N16 1 
243 80-06-123 Clip, Retaining TB A-B # 1492-N16 2 
244 75-18-540 Fuse, 500V/25A #FNQ-25 3 
245 75-18-456 Fuse, Bussman KTK-R-1 2 
246 75-18-458 Fuse, Bussman KTK-3 1 
247 80-53-636 Jumper, Plug in TB A-B #1492-N3 6 
248 75-84-004 Starter, Cutler Hammer, AE16ENO 1 
249 69-45-194 Heater, Culter Hammer, H2011-3 (Set of 3) 1 
 69-15-193 Heater Element Ch H2010 (Set of 3) 1 
250 80-71-379 Relay Timer Agastat #7022 A-H 1 
251 80-06-207 Contact, Aux., Culter Hammer 4 
253 79-06-011 Wire, 14 awg Electric, Cu. THHN, Blk 600V CSA 12 
254 84-01-077 Wire, 10 awg Electric, Cu. THHN, Red 600V CSA 10 
255 79-06-012 Wire, 14 awg Electric, Cu. THHN, Blk 600V Solid, 
CSA 
30 
256 65-92-010 Terminal, #14 awg, HLLGSWTH. Blk-Spade 
#B241662F 
14 
257 65-92-005 Terminal, Ring 10 awg 1/4 Stud, HLLSWTH 6 
258 80-06-130 Coil, Holding 120/60/50 Hz 45 mm 1 
259 80-06-131 Coil, Holding 120/60/50 Hz 65 mm 1 
 80-06-050 Compound, Sealing C-H # CHICO-A 1 
 80-06-220 Compound, Sealing Fiber C-H # CHICO-X 1 
 80-87-250 Tie, Cable, 1/16" x 1-1/8"" T&B #YT-542M 20 
 80-87-050 Tape, Elec. Vinul 3/4" x 66' x 0.0085" Thick 
Scotch 88 
1 
 39-95-197 Waterproofing Tape (Rubber) 1 
260 75-119-598 Holder Fuse .10-30 amp 1 pole 1 
 
Diagram 12 (414 Centrifuge Wiring Diagram Parts List) 
 
 
 72
 
Diagram 13 (518 Centrifuge Cabling) 
 
 
 73
 
Diagram 14 (518 Centrifuge Electrical Schematic) 
 
 
 74
 
 
 
 
Diagram 15 (518 Centrifuge Typical Feed Pump Starter Electrical Schematic) 
 
 
 75
 
Diagram 16 (518 Centrifuge Special Tools) 
The following special tools are needed to perform repair and maintenance on the 
518 Centrifuge 
 
 76
 
Special Tools Continued 
 
 
 77
Section 7 Appendix 
 
 Appendix A Gyrol Fluid Coupling 
 Appendix B Vibra Switch 
 Appendix C Conveyor Wear Recording 
 Appendix C Jolly Couplings Hydromechancial 
 
 
 78
APPENDIX A 
 
 
Gyrol Fluid Coupling 
 
 
General Information 
 
 The Fluid drive model NGS Fluid Coupling is designed to be installed as a complete 
unit on a standard NEMA-B motor shaft with a Worthington Type QD Sheave, 
furnished by the customer, mounted on the fluid coupling. The input shaft of the 
fluid coupling is finished bored and keywayed to fit the motor shaft and the stock 
bores are listed in the table. 
 
 Oil is not supplied with the coupling. The oil capacity indicated is the nominal 
amount required to fill the unit. Reference should be made to 3.3 Maintenance of 
Fluid Couplings in the manual for the correct oil fill angle and oil type for the 
Centrifuge. 
 
Installation Instructions 
 
 Note: 
 Ensure that all parts are clean and serviceable. Lubricated all screws, mating 
surfaces, shafts and shaft hub tapers with oil free from Molybdenum Disulfide. 
 
 1. Ensure the motor shaft dimensions are correct to NEMA-B Standard. 
 2. Unscrew the socket set screws and remove the collar from the input shaft. 
3. Locate the selected Type QD sheave on the tapered hub of the Fluid drive 
fluid coupling. Fit and evenly tighten the three hex head set screws and spring 
washers. 
4 Refit the collar on the input shaft and fit the three socket set screws. Ensure 
that the long screw is located in the input shaft. 
 
 
 
 
 79
 
 
 80
 
5. Fit the stepped key supplied into the motor shaft and mount the fluid coupling 
on the motor shaft, ensuring that the key and shaft key are correctly aligned. 
6. Move the coupling along the motor shaft as far as it will go. First tighten the 
lone set screw opposite the key on to the motor shaft, then tighten the two 
short set screws alternately to close input shaft evenly on to the motor shaft. 
 
 
General Dismantling/Assembly Notes 
 
1. Dismantle and assemble the Fluid Drive Coupling in a clean, dry area. Use 
lint-free rags for cleaning. 
2. Before assembly, ensure that all parts are clean and serviceable. Lubricate all 
mating surfaces, screws, shafts and shaft hub tapers with oil free from 
Molybdenum Disulfide. 
3. If the fluid coupling is installed, ensure that the motor is correctly 
disconnected from the power source before removing the coupling for 
dismantling. 
4. Loosen the three set screws in collar and withdraw fluid coupling from motor 
shaft. 
5. Use a suitable container when draining oil from the coupling. 
6. For those units not using lockwashers, apply Loctite 242 or equivalent 
anerobic locking adhesive to the bolt threads or the tappered hole after 
cleaning with industrial solvent. Tighten all bolts to the torque valves given in 
the installation instructions or torque table. 
7. Always fit new gaskets and oil seals when reassembling the unit. 
 
 
 
 81
Unit Dismantling Instructions 
 
 1. Remove the filter plugs. Drain the oil from the coupling. 
2. Fully unscrew the three socket set screws and remove the collar from the input 
shaft. 
3. Unscrew the three hex head set screws and spring washers and remove the 
pulley sheave from the hub. 
4. Unscrew and remove the set screws and spring washers from the hub flange. 
Remove the hub from the coupling, taking care to avoid damage to the needle 
roller bearings and seal. Discard the gasket. 
5.. Remove the socket head cap screws and spring washers, and remove the end 
cover. Discard the gasket. 
6. Remove the input shaft. Place a wrench or ring spanner over the shaft washer, 
"hold" the shaft and unscrew the shaft screw. Remove the shaft washer 
assembly. Fill the hole in the shaft with good quality grease. Refit the shaft 
assembly, ensuring that the pins fit in the matching holes in the shaft. Apply 
teflon sealer on threads of the shaft screw and screw it back into the shaft. 
Place the wrench or ring spanner over the shaft washer and "hold" the shaft, 
then tightenthe shaft screw so that the hydraulic pressure releases the shaft 
taper. Remove the shaft screw and washer. Gently tap the end of the shaft 
thought the ball bearing and remove the shaft. 
7. Inspect and replace the ball bearing as necessary, using an extractor to 
withdraw bearing from casing. A new sealing gasket must be fitted behind the 
weir ring before re-assembly. The end cover should compress the sealing 
gasket by a nominal 0.015 inches on final assembly to seal off the weir ring. 
8. Extract circle clip from hub and remove the needle roller bearing outer race 
complete for inspection. Inspect the needle roller bearing inner race on the 
input shaft and renew the complete bearing as necessary. 
 
Unit Assembly Instructions 
 
1. Insert a new oil seal into hub. Lightly coat seal lip with oil to ease assembly 
over input shaft. Press the needle roller bearing into the housing, ensuring 
that it is square to the bore. Refit circle clip. 
2. Ensure that the inner race of the needle roller bearing is correctly seated 
against the shoulder of the input shaft. Feed the shaft into the coupling until 
the shaft end just enters the ball bearing. Do not overpress. 
3. Fit the shaft washer, taking care to locate the roll pins in the matching holes in 
the shaft end. Apply loctite 242 to the threads and fit the shaft screw and 
tighten until the shaft taper engages in the taper of the runner hub. Place a 
wrench or ring spanner over the shaft washer, "hold" the shaft and tighten the 
shaft screw to the torque specified in table. Lightly coat oil seal journal of 
shaft with the oil to ease oil seal assembly. 
 
 
 82
 
4. Fit new gasket to the end cover and assemble the cover into casing spigot. Fit 
and evenly tighten the socket head cap screws and spring washers. 
5. Fit a new gasket to the hub and feed the hub over the input shaft taking care to 
avoid damage to the oil seal and needle roller bearings. To prevent damage to 
the seal lip, cover input shaft keyway before assembly with masking tape 
extending beyond the shaft end and fold the free end back onto itself to 
provide a "grip". Keep the tape lightly tensioned as the oil seal is fed along 
the shaft until it is located on the seal journal and the hub is correctly located 
in the casing spigot, then carefully pull the tape from the hub/input shaft 
assembly. Fit and evenly tighten the set screws and spring washers. 
6. Mount the selected type QD sheave on the hub and secure with the three hex. 
Head set screws and spring washers. 
7. Assemble the collar on to the input shaft, ensure that the long socket set screw 
is located in the hole in the shaft with the two short screws each side of the 
keyway. 
 
Filling Instructions 
 
Fluid drive couplings are shipped without oil and must be filled after assembly and 
before operation as follows: 
 
1. Remove one filter plug. 
2. Turn the coupling by hand to bring the plug hole to the 12 o'clock position, 
then turn the coupling back to bring the plug hole to the recommended fill 
angle from T.D.C (See Section 3.3 Maintenance of Fluid Couplings in this 
manual), and add oil to bring level up to plug hole. 
3. Ensure that the Dowty seal is in good condition and refit the plug. Tighten 
securely. 
 
DO NOT MIX OILS. CHECK LEVEL WHEN COLD 
 
 
Maintenance Instructions 
 
1. Checking tightness of bolts after the fluid coupling has been in service for a 
few weeks, check that the screws in the collar, pulley sheave, hub and bearing 
housing are tight. If necessary, tighten the cap screws to the specified torque 
valves. 
2. Checking filling at intervals of about 12 months, check the level of oil in the 
fluid coupling and, if necessary add oil to make up the level. 
 
Add only the same grade oil as that used for the initial filling of the couplings. 
 
 
 
 83
 
 
 
 84
 
Index 
No. 
Swaco Part 
No. 
Description Qty. 
1 Casing Weld Assembly 1 
2 31-70-002 Bearing Ring 2 
3 31-70-003 Ball Bearing 1 
4 31-70-004 Shaft Washer 1 
5 31-70-005 Roll Pin 1 
6 31-70-006 Unbrako Screw 1 
7 31-70-007 Safety Spring Washer 1 
8 31-70-008 Hex Set Screw 11 
9 31-70-009 Spring Washer 1 
10* 31-70-010 Filler Plug 2 
11* 31-70-011 Dowty Seal 3 
12* 58-67-492 Fusible Plug 2 
13* 31-70-013 Gasket 1 
17 31-70-017 Shaft Screw 6 
18* 31-70-018 Gasket 1 
29* 31-70-029 Copper Washer 1 
30 Input Shaft 1 
31* 31-70-031 Needle Roller Brg. 3 
32* 31-70-032 Oil Seal 12 
33 Hub 10 
37 31-70-037 End Cover 30 
38 31-70-038 Stepped Key 14 
51 31-70-053 Sealing Gasket 6 
52 31-70-052 Weir Ring 1 
53 31-70-052 Collar 1 
54 Socket Set Screw 1 
55 Socket Set Screw 1 
56 Spring Washer 20 
57 Set Screws Hex Head 1 
58 Circlip 1 
 
 
Note: 1. Items indicated by and asterisk (*) are recommended spares. 
2. In addition to the model and size, the serial no. of the coupling should be 
quoted when ordering spares. 
 
 
 
 85
APPENDIX B 
 
 
Vibraswitch Sensitivity Adjustments; The model 365 VIBRASWITCH is adjusted by a 
simple three-step procedure as describe below. In making the adjustment, cover bolts should 
be tight: 
 
1. With the equipment not running, back off the adjusting screw counter-clockwise 
(CCW) to the stop and press reset button. Then turn screw slowly clockwise until 
actuation occurs. Actuation can be heard as an audible "click". In very noisy 
surroundings, it may be necessary to use a portable ohmmeter or wire the Vibaswitch 
to the control circuit to tell when actuation occurs. This is the zero vibration point, or 
actuating point with the machine not running. (The location of this point depends on 
the mounting position. It will be zero for horizontal mounting. In other positions, 
loosen set screws on pointer and set pointer at zero and lock set screws at this 
actuating point with no vibration, or use arbitrary reference point determined above.) 
2. With machine running, back off adjusting screw one turn CCW and reset. If it will 
not reset, back screw off two turns CCW, etc. Again turn screw slowly clockwise 
until actuation occurs. The difference between the two actuating points is the normal 
vibration level in divisions. One dial division is 0.1 G's in the standard model or 0.15 
G's in the "LS" or special models. 
3. Back off screw CCW from the last position in (2) to the desired warning, or shutdown 
level. The exact amount must be determined from experience. However, if greater 
than 100% safety factor is required to prevent Vibraswitch actuation from rough 
startup or transient vibrations a Robertshaw time delay control unit should be used to 
obtain a reasonable amount of equipment protections. Reset the Vibraswitch and 
connect into the control circuit. 
 
A typical setting is sketched below: 
 
 
 
 86
 
In the above example the normal running vibration is 4 divisions. This would be 0.4 G's in 
the "LS" (Low Sensitivity) or special units. Here a 50% safety factor or two dial divisions 
have been added for the shutdown or alarm point. 
 
 87
 
APPENDIX C 
 
 
 
 88
 
The scrapping edge of the conveyor is subjected to wear when the conveyor transports the 
solids towards the narrow drum end. The wear rate depends on the size and type of the 
solids. The wear will reduce the transporting capacity and thus the separating results. A far 
advanced wear i.e. radially .250 mm (6.4 mm) or more will also cause high repair costs. It is 
necessary, therefore, to check the wear regular and observe how rapidly it progresses. 
 
Normally the heaviest wear of the scraping edge occurs in the zone where the conical and 
cylindrical parts of the drum meet. It is possible to measure the wear in this zone without 
dismantling the drum. In the flange of the conical part of the jacket there