Testing The Hydraulic Fluid Supply; Performing A Functional Test - Bosch rexroth 1 Series Instruction Manual

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.
For information on troubleshooting, see chapter 14 "Troubleshooting" on page 60.
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 maximum swivel angle. Refer to data sheet 93100 for the permissible value.
6. At maximum working pressure, check the case pressure at port L
and/or T or T . Refer to data sheet 93100 for the permissible value.
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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.
▶ After starting the drive motor, check in particular the specified pressures,
e.g. working pressure and case pressure.
▶ Perform a leak test without and with load prior to normal operation.
▶ If necessary, disconnect the pressure gauge and plug the ports with the specified
threaded plugs.
WARNING
RE 93100-01-B/2019-09-10, A20V(L)O Series 1, Bosch Rexroth AG
Commissioning 51/68
, L , L , or L
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