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Axial piston units
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Commissioning
Bosch Rexroth AG, RE 90300-B/2021-01-19
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 diskharged with bubbles, this is an indication that
the axial piston unit is not being sufficiently supplied with hydraulic fluid.
For information on troubleshooting, see chapter 14 "Troubleshooting" on page 52.
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 drain fluid 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 the product-specific data sheet for the
permissible value.
6.
At maximum working pressure, check the case pressure at a suitable drain port.
Refer to the product-specific data sheet 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 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.
▶ After starting the drive motor, check in particular the specified pressures,
e.g. working pressure, boost pressure and case pressure.
▶ Perform a leak test without and with load prior to normal operation.
▶ If necessary, remove the pressure gauge and plug the ports with the specified
threaded plugs.
