8
DKMH.PS.315.B1.02 520L0535
Series 20 – Axial Piston Pumps
Service Manual and Repair Instructions
Start-up procedure
PRECONDITIONS FOR
TROUBLE-FREE
OPERATION (continued)
FIRST-TIME OPERATION
The charge pressure measured at the charge pressure gauge connection port of the
pump with the adjusting lever in the neutral position should be approx. 15 bar [217.6 psi]
at a pump input speed n = 1500 min
-1
(rpm).
The charge pressure measured at the charge pressure gauge connection port of the
pump with the adjusting lever engaged should be approx. 2 bar lower at a pump input
speed n = 1500 min
-1
(rpm).
1. After installing the transmission and the corresponding pipeline connections,
remove the plug from the charge pressure gauge port of the variable displacement
pump. Fit a gauge with a measuring range up to 60 bar [870 psi] to this port.
The charge pressure gauge port has a straight 7/16-20 UNF-2 B SAE thread.
2. Disconnect the charge pump inlet line from the charge pump inlet connection pipe.
3. Fill the pump case and the motor case with the recommended oil through the drain
port.
4. Fill the oil reservoir with uid. As soon as oil emerges from the end of the discon-
nected charge pump inlet line tighten the pipe connector (see table to page 35 for
the correct tightening torque) and continue to ll the reservoir.
Only use oil reservoirs that are tted with air lters.
5. Disconnect the control linkage from the control handle. The pump must be in the
zero position.
6. Allow the prime mover to turn for approx. 15 sec. by using the starter.
6A. If the prime mover is an electric motor: Switch on and off again.
7. Then start the prime mover and allow the pump to turn at idling speed (approx. 750
min
-1
) for approx. 5 minutes.
7A. In the case of electric prime mover: Allow to turn for approx.1 minute.
After initial uctuations in pressure, the charge pressure should settle down to 10 bar
[145 psi] or 12 bar [174 psi].
8. Check the pressure uid level.
9. Raise the speed to approx. 1500 min
-1
(rpm). The gauge should now indicate a pres-
sure of approx. 15 bar [217.6 psi].
10. If the charge pressure falls to below 8 bar [116 psi], stop the prime mover, nd
the fault in accordance with the trouble-shooting guide and take the appropriate
remedial action.
11. Stop the prime mover and attach the control linkage to the control handle. Check the
uid level in the sight glass and ll to proper level if necessary.
12. Restart the prime mover and, under no-load, adjust the zero position by means of the
control handle - or even better by the control linkage - so that in both directions nal
position of stroke per Series 20 Axial Piston Pumps, Technical Information is achieved.
13. Allow the prime mover to turn at 1500 min
-1
(rpm). The charge pressure should now
be 15 bar [217.6 psi].
14. Slowly move the control handle backwards and forwards. If the pump is working
properly, the charge pressure drops by about 2 bar [29 psi] from the value stated in
step 13 above as the control handle initiated.
15. Allow the system to work under full load with a pump speed of approx.1500 min
-1
(rpm). It must be possible to achieve the values stated in steps 13 and 14 above.
16. Check all joints and connections for leaks.
17. Stop the prime mover. Remove the gauge from the connection port. Replace the
7/16-20 UNF-2 B plug and tighten with the tightening torque stated in the table to
page 35.
Check the pressure uid level in sight glass of the reservoir and ll to proper level
if necessary.
The system is now ready for operation.
Series 20 Axial Piston Pumps_SR.indd 24.4.2002, 14:028-9
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