REXROTH A4VSG - Testing the Hydraulic Fluid Supply; Performing Functional Test

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Hyquip Limited New Brunswick Street Horwich Bolton Lancashire BL6 7JB UK
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Commissioning 45/60
RE 92100-01-B/09.2012, A4VSG Series 10, 11 and 30, Bosch Rexroth AG
8.1.2 Testing the hydraulic fluid supply
The axial piston unit must 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 the noise development
and check the hydraulic fluid level in the reservoir. If the axial piston unit becomes
louder (cavitation) or the case drain 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53.
To test the hydraulic fluid supply:
1. Allow the engine to run at the lowest speed. The axial piston unit must be
operated without load. Pay attention to leakage and noise.
2.
Check the axial piston unit’s reservoir line during the test. The case drain fluid
should not contain any bubbles.
3. Increase the load and check whether the operating pressure rises as expected.
4. Carry out a leak test to ensure that the hydraulic system is sealed and can
withstand the maximum pressure.
5. Check the suction pressure at port S and the boost pressure at portE of the axial
piston pump at nominal speed and maximum swivel angle. Refer to data sheet
RE 92100 for the permissible value.
6.
Check the case drain pressure at port T, K
2
, K
3
or R(L) at maximum pressure.
Refer to data sheet RE 92100 for the permissible value.
8.1.3 Performing functional test
WARNING
Incorrectly connected axial piston unit!
Mixing up the ports will lead to malfunctions (e.g. lift instead of lower) and thus to
corresponding danger to persons and equipment!
▶ Before the functional test, check whether the piping specified in the hydraulic
schematic has been installed.
Once you have tested the hydraulic fluid supply, you must perform a functional test
on the machine/system. The functional test should be performed according to the
instructions of the machine/system manufacturer.
The axial piston unit is checked for functional capability before delivery according to
the technical data. During commissioning, it must be ensured that the axial piston
unit was installed properly in the machine/system.
▶ After starting the engine, check in particular the specified pressures, e.g. system
pressure, boost pressure and case pressure.
▶ If necessary, disconnect the gauge and plug the ports with threaded plugs.