Operating Instructions

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Operating Instructions 
Series 02 
For Linde Hydraulics axial piston 
units in closed loop application. 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 3
 
1 Range of application 4 
2 General instructions and safety information 5 
3 Environmental aspects 6 
4 General hints for fitting and installation 7 
5 Mechanical linkage of Linde axial piston units 8 
5.1 General hints regarding mechanical linkage 8 
5.1.1 Input and output shafts 8 
5.1.2 Cardan Shafts 8 
5.1.3 Additional mechanical power take off ( PTO ) 8 
6 Mounting position 9 
6.1 Variable displacement pumps HPV-02 9 
6.2 Hydraulic motors HMF/V/R-02 9 
7 Piping 10 
7.1 High and low pressure lines, maximum pressures 10 
7.2 Vent port, leakage lines and case pressure 10 
7.2.1 HPV pump with external suction auxiliary pump 10 
7.2.2 HPV pump with internal suction auxiliary pump 10 
7.3 Auxiliary pump suction line (external or hybrid) 10 
8 Hydraulic fluids, filtration and temperature 12 
9 Hydrostatic transmission in closed loop 13 
10 Initial start up 14 
10.1 Initial filling of the hydrostatic transmission with a filling device 15 
10.2 Initial filling of the hydrostatic transmission without a filling device 18 
11 Maintenance 21 
11.1 Checking and maintenance points 21 
11.1.1 Metrology points 21 
11.1.2 Check points 21 
11.1.3 Maintenance points 21 
11.2 Filter exchange 21 
11.3 Exchange of hydraulic fluid 21 
12 Circuit diagrams (examples ) 22 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
© 2006. This Document was created by M. Zivkovic / F. Taghaboni 
 
Content 
 
 
4 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
Read this operating instruction carefully and entirely, and keep it handy for reference. 
 
This operating instruction refers exclusively to Linde Series 02 hydrostatic units used in closed loop 
circuits. 
• Variable displacement pumps HPV-02 
• Variable displacement motors HMV-02 
• Regulating motors HMR-02 
• Fixed displacement motors HMF-02 
 
This document offers information, hints and instructions with regard to safety, effectiveness and life 
of the above listed hydrostatic units. These refer to the installation in the drive system, 
commissioning and use of the Linde units. Furthermore it contains instructions about the necessary 
maintenance work. 
 
This operation instruction is intended for experts already experienced in handling hydrostatic 
systems. Due to the vast variety of applications, it is impossible to deal with all executions of 
hydraulic pumps and motors within the frame of this document. So whenever application 
requirements, mounting situations and working conditions or simply uncertainties arise, they must be 
discussed with the manufacturer of the system on the basis of the following documentation. In case 
contact with Linde sales or service is needed, you are politely requested to take down the serial 
number from the name plate of the Linde unit. The name plate always reflects technical status of the 
unit. 
 
Our products are being developed permanently; So, please understand that we have to reserve the 
right for changes and no claims whatsoever may be derived from the contents of this operating 
instruction. 
 
By publishing this edition all previous editions become void. 
 
All rights in this instruction are reserved for Linde AG; for internal use however, copies may be 
produced. 
 
Training centre in Aschaffenburg Nilkheim 
In our training sessions we make our clients familiar with knowledge in hydraulics and product 
related to application. The training subjects have resulted from experience of our service team and 
will be oriented to specific customer applications if so desired. 
Our competent service team with its quick response is available to you worldwide. 
 
Technical support 
If you have technical questions concerning our products kindly contact the Linde Organization 
 
For information on your nearest Linde Company Branch, please refer to the contact pages at the end 
of this document. 
Range of Application 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 5
 
 
 
All valid safety regulations and accident prevention instructions must be adhered to. 
 
The Series 02 axial piston units referenced in this document are designed for application in the 
industrial field. As state of the art, they have been designed for safe function and manufactured 
according to the corresponding practices. 
In hydraulic drive systems correct component engineering is crucial; also, a professional approach to 
system design has a direct influence on the components used with regard to their operational 
properties and in particular to their life expectancy and working reliability. 
It is taken for granted that the basic planning for application, as well as all work related with transport 
, assembly, installation, commissioning and maintenance are carried out by qualified personnel and 
supervised by responsible experts. 
 
Special attention is required for: 
• Technical data and data about the permissible use (mounting, fitting, surrounding and working 
conditions) as is contained in product data sheets, installation drawings, spare parts catalogue, 
order specifications and name plate data. 
• General construction and safety procedures 
• Rules and requirements specific to the local plant 
• Correct use of tools, lifting and material handling accessories. 
• Use of personal protection equipment. 
 
Braking arrangement 
It is absolutely necessary to install a braking arrangement redundant to the hydrostatic braking 
system. It must be capable of stopping the vehicle out of its travel motion and/or serve as a parking 
brake. Or even, in the case of stationary applications bring the machine to a stop. 
Loss of frictional connection in the drive train of a hydrostatic system in the neutral position, or during 
acceleration and deceleration may mean loss of hydrostatic braking altogether. 
Legal regulations must be adhered to as well, under all circumstances! 
 
 
 
 
Failure to following the guidelines of this operating instruction may result in the failure of vital 
functions, machine damage, danger to health and life of personnel, imperilment to environment, as 
well as loss of warranty rights with Linde Material Handling. 
 
.
General Instructions and Safety Information 2
 
 
6 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
 
 
Protection of the natural fundamentals of life is one of our predominant tasks. We are continuously 
improving the protection of the environment as far as applications are concerned. We encourage you 
to contribute your share to comply with this demand. In connection with work to be performed, the 
environmental regulations of the machine manufacturer must be respected. 
 
In general: 
• Greases and oils which cannot be used any more have to be collected. They are normally a threat 
to water reserves and must be kept away from the environment. 
• Adhere to national and local regulations for waste disposal. 
 
 
3 Environmental concerns 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 7
 
Installation of the hydraulic system must be completed according to the circuit and piping diagram 
and the installation requirements of components as well as the technical data sheets and installation 
drawings. When designing electro-hydraulic circuits, care must be taken that the electrical 
requirements are respected, e.g. the prescribed voltage is applied to the equipment. For the 
hydraulic piping seamless drawn precision steel pipes according to DIN 2391/C or hoses of suitable 
pressure rating must be chosen. Pipes have to be deburred, washed out and blown through. Pipes 
which have accumulated scale or rust must be steeped and then neutralized; hose lines when 
contaminated need brushing outand flushing through. 
Cleanliness is an important point. The connection ports of hydraulic equipment are, as a rule, closed 
by the manufacturer with plastic plugs or tape after thoroughly flushing all passages. Cleanliness 
must be the supreme concern while assembling a hydraulic system. Never plug finished pipes with 
rags; use plastic foil, tape or plugs instead. Under no circumstances use cloth. 
 
General hints for fitting and installation 4
 
 
8 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
5.1 General hints for mechanical linkage 
The mechanical connection of a Linde Unit to the drive system is made by its housing flange and the 
shaft end of its primary input or output. 
Linde axial piston units are conceived as plug-on units for coaxial connection to a drive system, i.e. 
for coupling without radial or angular off-set between driving and driven shaft. The corresponding 
permissible values regarding the transmissible shaft torque and the effective axial forces are found in 
the technical data sheet, the installation drawing or the catalogue. Axial forces acting directly on the 
shaft end of Linde axial piston units are to be avoided. If radial forces are unavoidable for certain 
reasons, do, under all circumstances talk to us in the early design stage. This applies in particular to 
cantilevered arrangements of tractive components, e.g. drive belts or chains at the shaft end. 
 
5.1.1 Input and output shafts 
In Linde axial piston units of series 02, the shaft ends of the primary input or output are released as 
edge centered splines with involute type splines as per ANSI B92.1. The prescribed counter fit of 
coupling; pinion or pulley must be strictly adhered to. In principle, both during assembly and 
disassembly input and output elements must not be treated with knocking or beating forces (e.g. 
hammer blows) on shaft ends of Linde axial piston units, since this will inevitably lead to damage of 
the drive assembly, particularly of the shaft bearings. 
In a drive system made of several components it is usually necessary to dampen rotary oscillations 
from the prime mover or from the driven lot by means of adequate flexible coupling elements. For 
this case rotary elastic couplings are to be applied which have to be matched to the drive system in 
their dynamic transmitting properties. In particular it has to be assured that the system stays free of 
resonance. 
 
5.1.2 Cardan Shaft 
The manufacturer’s installation instructions must be followed! 
In order to avoid rotary oscillations, keep in mind that both input and output parts of the cardan shaft 
are fitted under the same angle and on the same level. Only balanced cardan shafts may be utilized 
and the links must be put together correctly! 
 
5.1.3 Additional mechanical power take off (PTO) 
All variable pumps of Linde's 02 line are equipped with a mechanical power take off as a through 
shaft at the rear end. This may be used for powering additional drives. 
Care must be taken that the permissible torque is not exceeded at anytime. For tolerable values 
please refer to the technical data sheet or catalogue. 
Mechanical linkage of Linde axial piston units 5 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 9
 
In the planning stage of a system and subsequent installation utmost care must be taken that the 
housing of the hydraulic pump and of the hydraulic motor remains completely filled with fluid after 
initial filling, venting and in every state of operation. They cannot run empty during operation and 
temporary or long term stand still. If deemed necessary, additional information regarding the 
mounting position may be inquired before the system is conceived. 
 
6.1 Variable pump HPV-02 
If mounting position is horizontal, servo device on top is preferred for better venting. 
 
6.2 Hydraulic motors HMF/V/R-02 
Any position is okay, except when the drive shaft points vertically upwards. This requires special 
measures because of the risk of shaft bearing and shaft seal running dry. A modified version which 
tolerates this position is available upon inquiry. 
 
Mounting position 6
 
 
10 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
7.1 High and low pressure lines, maximum pressures 
Be sure that hoses, pipes and fittings are sufficiently strong with regard to bursting. In regards to 
operational reliability, it is important to keep in mind the maximum permissible pressures at the 
connection point of working and auxiliary ports of the Linde units. 
 
7.2 Venting port, leakage lines and case pressure 
Case drain lines must be installed in such a way that the housings of the hydraulic components are 
always filled with fluid. The case pressure (build-up) should not rise and stay higher than 2.5 bar 
(absolute) during operation. 
If during the prototype development and while warming up from a cold start, a higher pressure is 
found short term, this may be accepted as long as it is discussed with Linde 
 
7.2.1 HPV-02 pump with external suction boost pump 
The higher one of the two case drain ports on the pump housing has to be connected to tank. If port 
"T" is used an additional line for "L" or "U" must be installed. The oil not required for boosting is 
discharged into the pump housing across the boost pressure relief valve, carrying away any air 
gathered in the pump housing. Ports "L" or "U" of the hydraulic motor must be connected to tank. The 
leakage line is to be installed below the fluid level in the hydraulic tank. 
 
7.2.2 HPV-02 pump with internal suction gear pump 
For venting, use the highest connection point, e.g. "T" (pump control) or the one at the pump housing 
"L" or "U". The vent line is to be mounted steadily rising towards the tank. This enables any air 
gathered inside the pump housing to escape into the tank. The highest case drain port "L" or "U" of 
the hydraulic motor has to be connected to the HPV pump housing e.g. "U". 
 
7.3 Suction line of the ancillary pump external or hybrid 
The installation of the suction line must be carried out straight, as short as possible and with few 
bends. The piping itself has to be rated in such a way and the tank positioned so, that the permissible 
negative head of (-200mbar) at suction port A/B can be achieved. 
 
 
 
 
We explicitly emphasize that operation of Linde axial piston units with the housing insufficiently filled 
with fluid will immediately damage the drive group. Therefore check the installation of the Linde unit 
in the hydraulic system to assure the case(s) are filled prior to startup. 
Pipe work 7 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 11
 
Circuit Diagram (Example) 
 
1 Hydraulic pump HPV-02 size 35-280: 
- With electro-hydraulic control E 1 
- drive direction clockwise 
- boost pump with internal suction 
- Oil cooler (by customer) in boost pressure loop 
 
2 Hydraulic motor HMF-02 sizes 28-280: 
- With purging device. 
- Pressure in at port A: Clockwise rotation. 
- Pressure in at port B: Counter-Clockwise rotation. 
 
 
 
 
U(L)
L(U)
A
B
A
T
S(P)
P(S)
U(L)
FX
2
1
L(U)
Y
Z
Pipe Work 
1 Hydraulic Pump HPV-02
P, S High pressure port
B Suction port boost pump 
A Pressure port boost pump
F Control and boost pressure supply
T Tank and vent port
X Boost pressure gage port
Y, Z Control pressure gage port
MY, MZ Proportional solenoid 24V
Ms, Mp High pressure gage port
L Oil filling, tank and vent port
U Drain, flushing return from hydr. Motor
A, B High pressure ports
L, U Oil leakage ports.
Connection enabling case to be filled with oil.
2 Hydraulic Motor HMF-02
EXPLANATIONS
7
 
 
12 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
Acceptable fluids 
- Mineral oil HLP according to DIN 51524 
- Biodegradable oils upon inquiry 
- Other hydraulicfluids upon inquiry 
 
Technical data 
 
 
Viscosity Recommendations 
 
 
Linde recommends exclusive use of hydraulic fluids for which the manufacturer confirms their 
suitability for high pressure hydraulic systems. Knowledge of operating temperature in the circuit is a 
precondition for the right choice of fluid. The choice of hydraulic fluid should be made in such a way 
that operational viscosity at operational temperature stays in the optimum range (see table above). 
Note: leakage oil temperature is influenced by pressure and rotating speed and is always above 
circuit temperature. The temperature should not be above 90°C at any point in the system. If it is not 
possible to adhere to the above conditions for any reason, you are requested to contact us. 
 
 
 
Mixing different mineral hydraulic fluids is only possible after consulting us for release. 
Mixing mineral oils with bio-type oils is always forbidden. 
 
 
Filtration 
In order to ensure functionality of the hydraulic components and their high efficiency, cleanliness of 
the working fluid should at least correspond to class 18/13 as per ISO 4406 at all time. 
With today's filtration technology, however, far better values can be achieved, which contributes 
essentially to prolonging the working life of hydraulic pumps and motors and the whole system. 
 
Hydraulic fluids, temperature and filtration 
Working Viscosity Range [mm²/s] = [cSt] 10 to 80
Optimum Working Viscosity [mm²/s] = [cSt] 15 to 30
Max. Viscosity (short time start up) [mm²/s] = [cSt] 1000
 Working temperature [°C] 
 30 to 40
 60 to 80
Viscosity class [mm²/s] = [cSt] at 40 °C
22
46 or 68
8 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 13
 
The main connection ports of the hydraulic pump are connected to the main connection ports of the 
hydraulic motor by means of hydraulic hoses, pipes or tubes. The circulation of fluid always goes from 
the hydraulic pump to the hydraulic motor and from there directly back to the hydraulic pump. 
Leakage is replaced by an auxiliary pump (boost pump). Since leakage is extremely small in such 
systems, it is necessary to continuously exchange the oil by means of a purging system on the 
hydraulic motor to provide cooling. So the boost pump also works as a purging pump and as a 
pressure source for the servo control. 
The direction and speed of flow and therefore rpm and direction of rotation at the output shaft of the 
hydraulic motor depends on: 
-The pump direction of rotation 
-The over centre direction of the swash plate 
Pump rotation is always defined by looking at the drive shaft and noted on the name plate. 
Changing of drive rotation requires conversion of both HPV pump and auxiliary pump. System 
pressure is determined by the load on the motor shaft. Different kinds of control for hydraulic pumps 
and motors may be found on the respective data sheets. 
 
Circuit diagram (example) 
1 Hydraulic pump HPV-02 size 35-135 2 Hydraulic motor HMF-02 sizes 28-280: 
 - With electro-hydraulic control E 1 - with purging device* 
 - Drive direction clockwise pressure in at A: clockwise rotation 
 - Boost pump with internal suction pressure in at B: counter clockwise rotation 
 - Oil cooler (by customer) in boost pressure loop 
*Purging arrangement, see functional description of hydraulic motors.
Hydrostatic Transmission in closed loop 9
1 Hydraulic Pump HPV-02
P, S High pressure port
B Suction port boost pump 
A Pressure port boost pump
F Control and boost pressure supply
T Tank and vent port
X Boost pressure gage port
Y, Z Control pressure gage port
MY, MZ Proportional solenoid 24V
Ms, Mp High pressure gage port
L Oil filling, tank and vent port
U Drain, flushing return from hydr. Motor
A, B High pressure ports
L, U Oil leakage ports.
Connection enabling case to be filled with oil.
2 Hydraulic Motor HMF-02
EXPLANATIONS
B
F
X
P(S)
S(P)
A
U(L)
Ms
Mp
L(U)
T
Y
Z
A
B
U(L)
L(U)
MZ MY
 
 
14 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
Read operational instruction carefully and completely before you begin with start up. 
 
Professional and careful start up is the prerequisite for trouble-free operation and optimum life 
expectancy! 
 
Cleanliness 
Oil reservoir and installation have to be checked again for cleanliness before the hydraulic medium is 
added. This act has to be performed immediately before pouring in. It may even be expedient to rinse 
the entire installation! Make sure that only absolutely clean and filtered hydraulic fluid is filled in. 
 
Drive rotation 
Before starting the engine make sure that the HPV-02 pump will be driven with the correct direction 
of rotation. With electric motors, it must be checked that the electrical connections are correct. The 
electric symbol is normally found in the cover of the connector box. 
 
 
 
Under no circumstances start the engine to check the rotation! If the HPV-02 pump is driven against 
its specified rotation, the boost pump (auxiliary pump) is unable to build up base pressure. For lack of 
lubrication the drive group will instantly be damaged (initial damage) which may result in total break 
down. 
 
Initial filling of the hydrostatic transmission 
Before starting the prime mover, it must be assured that the housings of the hydraulic components 
are filled with oil. Before the hydraulic components may be loaded, the entire circuit must be filled up 
and vented. 
 
Test instruments 
During commissioning it is necessary to monitor the base pressure (boost pressure of the auxiliary 
pump). Remove the plug from gauge port "X" in the filter flange and connect a gauge 0-40 bar. 
 
Filling device 
We recommend performing the initial filling by means of a filling device. The filling device consists of 
a gear pump with a capacity of about 5 l/min and a pressure relief valve at 23 bar (pressure setting of 
boost pressure relief valve e.g. 19 bar +4 bar), plus a fine mesh filter of 10μm or better. 
 
Filling device consisting of: 
1. Shut off valve 
2. Low pressure gauge 0-40 bar 
3. Gear pump Q=5 l/min 
4. Pressure relief valve p=23 bar 
5. Fine strainer 10 μm or better 
 
Initial Start Up
 
3
4
5
1
2
Filling device
10 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 15
 
A B
F
X
MZ
MY
T
Y Z
X
F
MsMp P (S) S (P)
10.1 Initial filling of the HST with a filling device. 
Preparation 
- Connect gauge to port "X" 
- Connect filling device to port "F" (boosting). 
- Loosen vent plug on cooler. 
- Loosen fittings on gauge ports "Ms" and "MP" of the HPV pump and remove them. Connect two small 
 lines for venting and lead both into a bucket. 
- Loosen plug on port "L" or "U" (the one which is not occupied). 
 If the housing of the hydraulic motor is not easily accessible, it must be filled with clean oil 
 beforehand. 
 
 
 
 
Initial Start Up 
 Hydraulic Pump HPV-02 E1
P, S High pressure port
B Suction port boost pump 
A Pressure port boost pump
F Control and boost pressure supply
T Tank and vent port
X Boost pressure gage port
Y, Z Control pressure gage port
MY, MZ Proportional solenoid 24V
Ms, Mp High pressure gage port
L Oil filling, tank and vent port
U Drain, flushing return from hydr. motor
EXPLANATIONS
U(L)
L(U)
A
B
A
S(P)
P(S)
U(L)
FX
2
1
3
4
5
1
2
Filling device
L(U)
T
Y
Z
10
 
 
16 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
Filling and Venting of the entire system 
When using the filling device, depending on the installation, the entire system is filled with hydraulic 
fluid. 
 
Information 
The pressure of the filling device opens the boost pressure relief valve in the pump; 
as a result, the pump housing, hydraulic tank, cooler and hydraulic motor housing are filled. Make up 
valves for the closed loop open and both main linesare filled. Take care that the relief valve of the 
filling device is set at least 4 bar higher than the corresponding boost pressure setting. While filling, 
monitor the reservoir for over filling. 
 
Filling procedure 
- Switch the filling device on. 
- Keep an eye on the venting plugs on hydraulic motor and cooler and close as soon as no more 
 bubbles show in the hydraulic fluid. 
- The hydraulic tank is to be filled as high as to the middle of the upper level indicator. Monitor for 
 leak! 
- Next disconnect the micro hoses on the high pressure gauge connections "Mp" and "Ms" and plug 
 the connection ports. 
- Remove filling device. 
- Collect any hydraulic fluid that may have come out and wipe clean 
. 
 
 
Attention 
Dump the collected waste fluid according to the prevailing regulations, do not use it again! 
Now the hydraulic system is nearly full of hydraulic fluid and vented. 
 
 
 
Before starting the engine, remember the following points! 
 
A. Make sure the pilot lines for the pump’s control are disconnected! In the starting phase the 
 HPV-02 pump must not be actuated! 
B. Disengage the vehicle and secure it against rolling away or jack it up. Safeguard machines 
according to their nature. Safeguard surroundings of the vehicle. Uninvolved personnel are to be 
kept at a safe distance at the moment of starting. 
 
Initial Start Up 10 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 17 
 
Start drive engine for the first time and leave it running for a few seconds 
- Engine is running at low idle. The HPV-02 pump runs at no load. 
- Electric motors: switch on and after 5 seconds switch off. 
- After initial oscillation boost pressure rises immediately to set pressure of the safety valve. This can 
 be read on the gauge (port "X"). 
- Switch engine off and check fluid level in the tank. Top off if necessary. 
- If the pressure setting could not be reached in the starting phase switch engine off at once. Find 
the reason before you start again. 
- Wait for approx. 5 minutes before you start once more and search the installation for possible 
 leakage! Attach micro-hose lines to the high pressure gauge ports "MP" and "MS" and lead them 
 both into a bucket. If micro-hose are not available then bleed main lines by cracking open the 
 fittings on “MP” & “MS” for a couple of turns. 
- Connect/activate control of the HPV-02 pump 
 
Starting the engine again 
- Engine is running at low idle. 
- HPV-02 pump runs at no load. Boost pressure is stable and shows the required value. 
- Set engine speed at approx. 1500 rpm and switch off after 5-10 seconds. 
- Disconnect the micro hoses from the high pressure gauge ports "MP" and "MS"; install plugs and 
 secure with the corresponding torque. 
- Check oil level in the hydraulic tank and top off as required. 
 
Start drive engine again 
- Drive engine runs at low idle. 
- HPV-02 pump runs at no load. Boost pressure is stable and shows the required value. 
- Operate engine at working speed. 
- Have HPV-02 pump gradually actuate in both directions up to max angle (for some 30 seconds in 
 each direction). Full load should not be reached. 
- By now the purging device of the motor is also activated. With a pressure differential A-B of some 
 20 bar a measured quantity of hydraulic fluid is discharged and thereby taking the remaining air 
 with it. 
- Switch engine off. Remove gauge from port "X". Install plug and tighten. Check the system again for 
 leaks and tighten if necessary. 
- Check fluid level again and top off if required. 
 
Hint 
Leave the vehicle for about 30 min. Residual air can escape to the hydraulic tank only when the drive 
engine is at stand still. 
 
THE HYDROSTATIC TRANSMISSION IS NOW READY TO USE! 
 
Initial Start Up 10
 
 
18 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
10.2 Initial filling of the HST without a filling device 
 
Preparation 
- Before you ignite the engine make sure that the housings of the hydraulic units are filled with 
 hydraulic fluid. 
- Fill hydraulic reservoir with hydraulic fluid. 
- Vent the HPV housing at port "T" or "L (U)" and the motor housing at port "L (U)". 
- Connect a pressure gauge at port "X". 
- Loosen cooler vent plug. 
- Loosen the fittings at gauge ports "MS" and "MP" of the HPV pump and take them away. Connect 
 micro hoses as vent lines and lead them both into a bucket. 
 
HPV 02 E1 
 
 
 
 
 
 
Initial Start up 
A B
F
X
MZ
MY
T
Y Z
X
F
MsMp P (S) S (P)
 Hydraulic Pump HPV-02 E1
P, S High pressure port
B Suction port boost pump 
A Pressure port boost pump
F Control and boost pressure supply
T Tank and vent port
X Boost pressure gage port
Y, Z Control pressure gage port
MY, MZ Proportional solenoid 24V
Ms, Mp High pressure gage port
L Oil filling, tank and vent port
U Drain, flushing return from hydr. motor
EXPLANATIONS
10 
 
 
19 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
Circuit diagram (example) 
1. Hydraulic pump HPV-02 size 35-280: 2. Hydraulic motor HMF-02 size 28-280: 
- With electro-hydraulic control E 1 - With purging device 
- Drive direction clockwise Pressure in at A: clockwise rotation 
- Boost pump with internal suction pressure in at B: counter clockwise rotation 
- Oil cooler (by customer) in boost pressure loop 
 
 
 
 
 
Before starting the drive engine the following points need your attention! 
 
A. Make sure the input signal for the HPV servo is disconnected! The HPV pump must be off stroke in 
the starting phase! 
B. Disengage the vehicle and secure against rolling away or prop up. Secure the machines 
according to their nature. Also secure the surroundings of the vehicle. During the starting phase 
uninvolved persons must keep sufficiently safe distance. 
 
Actuate the prime mover for the first time 
- Have the operator rotate the engine twice for 5-10 seconds. 
- Electric motors: switch on and off. 
- After initial oscillations the boost pressure rises and Can be read on the gauge (port "x"). 
- Check fluid level in the hydraulic tank and top off if required. 
- Should boost pressure not rise during starting refrain from activating the drive engine and find out 
 the reason. 
- Before actuating again wait for some 5 minutes and check the installation for possible leaks. 
- Ask the operator to run the engine again for 5-10 seconds twice. 
- Boost pressure should rise immediately and can be read on the gauge (port "X"). 
- Check fluid level in the hydraulic tank and fill up if necessary. 
U(L)
L(U)
A
B
A
S(P)
P(S)
U(L)
FX
2
1
L(U)
T
Y
Z
 Hydraulic Pump HPV-02 E1
P, S High pressure port
B Suction port boost pump 
A Pressure port boost pump
F Control and boost pressure supply
T Tank and vent port
X Boost pressure gage port
Y, Z Control pressure gage port
MY, MZ Proportional solenoid 24V
Ms, Mp High pressure gage port
L Oil filling, tank and vent port
U Drain, flushing return from hydr. motor
EXPLANATIONS
Initial Start Up
 
10
 
 
20 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E 
 
 
Start the prime mover for a first time and have it run for several seconds. 
- The drive engine runs at low idle speed. The HPV-02 pump runs with no load. 
- Electric motors: switch on and after 5 seconds switch off. 
- Boost pressure rises immediately and can be read on the gauge (port "X"). 
- Set engine speed at about 1500 rpm and after approx 5-10 seconds switch off. 
- Disconnect micro hoses from the high pressure gauge ports "MP" and "MS"; apply plugs and tighten 
 them. 
- Check fluid level in the hydraulic tank and top off if necessary. 
- Before starting again wait for about 5 minutes and check the installation for leakages! 
- Connect /activate servo of the HPV-02pump. 
 
Start the prime mover once more 
- The prime mover runs at low idle speed. 
- The HPV-02 pump runs with no load. Boost pressure is stable and shows the required value, e.g. 
 19 bar. 
- Have engine run at working speed. 
- Swing HPV pump slowly in both directions up to max tilting angle (in each direction for about 30 
 seconds). Pump should not rich maximum load pressure. 
- Now the discharge arrangement of the hydraulic motor is also activated. At a pressure difference 
(A-B) of approx. 10 bar, a flow of oil is discharged into the motor’s case carrying the trapped air 
with it. 
- Stop drive engine. Remove gauge from port "X". Fit the plug screw and tighten it. Check for leakage 
 again and tighten the fittings if needed. 
- Loosen plug screws at the high pressure gauge ports "MP" ands "MS" and vent, subsequently 
 tighten with the appropriate torque. 
- Repeat checking the fluid level and fill up if required. 
 
Hint 
Leave the vehicle alone for about 30 min. The residual air in the system can escape to the hydraulic 
tank only when the engine is off! 
 
 
 
Attention 
Waste fluid must be collected and dumped as prescribed. Do not re-use! 
Now the hydraulic system is nearly filled with hydraulic fluid and vented. 
 
 
THE HYDROSTATIC TRANSMISSION IS READY TO USE! 
 
Initial Start Up
 
10 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 21 
 
Maintenance of the hydrostatic transmission is confined to exchanging the filter of the HPV-02 pump 
and exchanging the hydraulic fluid 
 
11.1 Checking and maintenance points 
 
 
 
Access to all checking and maintenance points should be considered at the design stage. Difficult 
access to and poor visibility of maintenance points generally make them hard to clean. That residual 
dirt may get into systems and assemblies when they are opened for any reason Moreover, there is 
the risk of injury and mishandling. 
 
11.1.1 Test points 
- High pressure (HP) 
- Low pressure (LP) 
 
11.1.2 Checking points 
- Oil level. 
- Measuring sticks. 
 
11.1.3 Maintenance points 
- Filters 
- Filler and drain plugs 
- Magnetic plugs 
 
11.2 Exchange of filters 
The filter supplied with the HPV pump has to be replaced 100 hours after final commissioning. 
Further exchanges must be made after every 500 working hours. Only original Linde filters may be 
utilized. 
 
11.3 Exchange of hydraulic fluid 
Attention ! Use proper handling and storage procedures and material. 
Depending on the application, the hydraulic fluid is to be exchanged after every 1000 to 2000 
working hours. High working temperatures in combination with frequent phases of cooling down at 
lower temperatures result in water condensation and shorten the exchange intervals of hydraulic 
fluid. Proper oil exchange is done by draining all the oil from tank, cooler, pump and motor housing. 
The quantity of oil remaining in the high pressure circuit need not be replaced (do not bother to open 
the high pressure lines). 
Procedures stated for initial filling are similarly applicable to the exchange of hydraulic fluid. 
 
Maintenance 11
 
 
22 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
12.1 Hydraulic pump HPV-02 
- Mechanic-hydraulic control M1 
- Drive direction CW 
- Boost pump with internal suction 
 
 
 
 
Circuit Diagrams (Examples) 
10 µm
P L1 L2
MP
U (L)
F
L (U)
MS
S
(S)
(P)
X 
X 
X 
X 
2 bar
X
A
B
X 
X 
EXPLANATIONS
P, S High pressure port
A Pressure port boost pump
B Suction port boost pump
F Control pressure supply,
Boost
X Control pressure gage port
Ms, Mp High pressure gage port
L, U Drain (filling, vent) ports and
flushing return from hydr. motor
L1, L2 Vent ports
12 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 23 
 
12.2 HYDRAULIC MOTOR HMV-02 
- Electric control E1 
- With purging device 
 
 
Pressure in at A: CCW rotation 
Pressure in at B: CW rotation. 
 
 
 
Circuit Diagrams (Examples) 
A
B
E
L1
Vmin Vmax
L
U
MA
MB
EXPLANATIONS
A, B High pressure port
E Control pressure PE 20-40 bar
MA, MB Gage port high pressure
U, L Oil filling, drain, tank and vent port, purge oil
L1 Oil filling, drain, tank and vent port
12
 
 
24 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
12.3 HYDRAULIC MOTOR HMR-02 
- With electric maximum displacement override 
- Electric brake pressure shut-off 
- Purging system 
 
Pressure in at A: CCW rotation 
Pressure in at B: CW rotation. 
 
 
 
Circuit Diagrams (Examples) 
A
L
U B
M1
M2
Vmin Vmax
XA
10
Y1
EXPLANATIONS
A, B Main pressure ports
Y1 Gage port actuating pressure
XA Gage port, actuating pressure supply
L, U
Drain, filling, vent ports. Port enabling case 
to be filled with oil.
12 
 
 
BA GK 0306 E Operating Instructions Series 02. Axial piston units in closed loop application. 25 
 
12.4 HYDRAULIC MOTOR HMF-02 
- Purging system 
 
Pressure in at A: CW rotation 
Pressure in at B: CCW rotation. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
L
B
AA
U
EXPLANATIONS
A, B Main pressure ports
L, U
Drain, filling, vent ports. Port enabling case 
to be filled with oil.
Circuit Diagrams (Examples) 12
 
 
26 Operating Instructions Series 02. Axial piston units in closed loop application. BA GK 0306 E
 
How to reach us. 
Linde Hydraulics. Your partner for sales and service. 
 
Internet www.linde-hydraulics.com 
 
Phone +49.60 21.99 42 01 
 +49.60 21.99 0 Zentrale 
 
Fax +49.60 21.99 42 02 
 +49.60 21.99 42 30 
 
E-Mail info@linde-hydraulics.com 
 
Post Linde AG 
 Linde Hydraulics Division 
 Grossostheimer Str. 198 
 63741 Aschaffenburg, Germany 
 
 P.O.B. 100136 
 63701 Aschaffenburg 
 
 
Linde Hydraulics. Sales Companies. 
 
[E] Linde Material Handling Ibérica S.A. 
 Avda. Prat de la Riba, 181, 08780 Palleja (Barcelona), Phone +34.9 36 63 32 32, 
 hidraulica@linde-mh.es 
 
[F] Fenwick Linde, Activité Linde Hydraulique 
1, rue du Mal de Lattre de Tassigny, 78854 Elancourt Cedex, Phone +33.1 30 68 46 47, 
harald.kohl@fenwick-linde.fr 
 
[GB] Linde Hydraulics Ltd. 
 7, Nuffield Way, Abingdon Oxon OX14 1RJ, Phone +44.12 35.52 28 28, 
 enquiries@lindehydraulics.co.uk 
 
[I] Linde Material Handling Italia SPA 
 Via Luguzzone, 21020 Buguggiate (VA), Phone +39.03 32.877 111, 
 vendita.idraulica@linde-mh.it 
 
[USA] Linde Hydraulics Corporation 
P.O. Box 82, 5089 Western Reserve Road, Canfield Ohio 44 406, Phone +1.330.5 33 68 01, 
info@lindeamerica.com 
 
[VRC] Linde Forklift Truck Co. Ltd., Linde Hydraulics Division 
 No. 89 Jinshang Lu, 361009 Xiamen, Phone +86.592.55 33 291, haas@linde-xiamen.com 
Contact 
 
 Linde AG 
 Linde Hydraulics Division 
 Grossostheimer Str. 198 
 63741 Aschaffenburg, Germany 
 
 www.linde-hydraulics.com 
 
 
 
 
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