Service Manual and
Axial Piston Pumps Series 20
Repair Instructions
L1003506
• Rev BA • Jun 2014
9
First-time Operation
(continued)
P000 337E
Gauge port -
servo cylinder pressure
(both side)
Control handle
Gauge port "M":
Charge pressure
Port "S":
Suction port
(charge pump)
Port "A"+"B":
High pressure
Case drain ports
11. Stop the prime mover and attach the control linkage to the control handle. Check the fluid level in
the sight glass and fill 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 final 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 fluid level in sight glass of the reservoir and fill to proper level if necessary.
The system is now ready for operation.
Start-up procedure
