Bosch rexroth 12 Series - Testing the Hydraulic Fluid Supply; Performing a Functional Test

RE 92802-01-B/2023-03-27, BoschRexrothAG
Commissioning | A15VSO/A15VLO series 12 45/60
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 lled and air bled. To verify, drain the
hydraulic uid at the drain port until there are no bubbles in the uid.
8�1�2 Testing the hydraulic uid supply
The axial piston unit should always have asufcient supply of hydraulicuid.
For this reason, the supply of hydraulic uid must be ensured at the start of the
commissioning process.
When you test the hydraulic uid supply, constantly monitor noise development
and check the hydraulic uid level in the reservoir. If the axial piston unit becomes
louder (cavitation) or the leakage uid is discharged with bubbles, thisis an
indication that the axial piston unit is not being sufciently supplied with
hydraulic uid.
For information on troubleshooting, see chapter 14 "Troubleshooting" on page 53.
To test the hydraulic uid 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 92802 for the permissible value�
6� At max. working pressure, check the case pressure at port T
1
, T
2
or T
3
�
Refer to data sheet 92802 for the permissible value�
8�1�3 Performing afunctional test
WARNING
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 specied in the
hydraulic circuit diagram has been installed.
Once you have tested the hydraulic uid 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.