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5� Operate the axial piston pump at a low rotational speed (starter speed for
internal combustion engines and/or inching mode for electric motors) until
the hydraulic system is completely filled and air bled. To verify, drain the
hydraulic fluid at the drain port until there are no bubbles in the fluid.
8�1�2 Testing the hydraulic fluid supply
The axial piston unit should always have a sufficient supply of hydraulic fluid.
For this reason, the supply of hydraulic fluid must be ensured at the start of the
commissioning process.
When you test the hydraulic fluid supply, constantly monitor noise development
and check the hydraulic fluid level in the reservoir. If the axial piston unit becomes
louder (cavitation) or the leakage fluid is discharged with bubbles, this is an
indication that the axial piston unit is not being sufficiently supplied with
hydraulic fluid.
Notes on troubleshooting can be found in chapter 14 "Troubleshooting" on page 50.
To test the hydraulic fluid supply:
1� Allow the drive motor to run at the lowest rotational speed. The axial piston
unit should be operated without load. Pay attention to leaks and noises.
2� Check the axial piston unit's drain line during the test. The leakage should be
without bubbles.
3� Increase the load and check whether the working pressure rises as expected.
4� Perform a leak test to ensure the hydraulic system is sealed and can withstand
the max. pressure.
5� Check the suction pressure at port S of the axial piston pump at nominal speed
and max. swivel angle. Refer to data sheet 92704 for the permissible value.
6� At maximum working pressure, check the case pressure at the port L
(optional). Refer to data sheet 92704 for the permissible value.
8�1�3 Performing a functional test
Improperly connected axial piston unit!
Mixing up the ports will cause malfunctions (e.g. lift instead of lower) and could
endanger personnel and equipment!
▶ Before the functional test, check whether the piping specified in the
hydraulic circuit diagram has been installed.
Once you have tested the hydraulic fluid supply, perform a functional test of
the machine/system. The functional test should be performed according to the
instructions of the machine/system manufacturer.
The axial piston unit is tested for functional capability and performance before
delivery according to the technical data. During commissioning, make sure the
axial piston unit was installed in the machine/system as intended.
Commissioning | A10VOH145 series 60
WARNING
RE 92704-01-B/2022-12-07, Bosch Rexroth AG
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or L
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