Performing A Functional Test - Bosch rexroth A4VSO 10 Series Instruction Manual

50/72 Commissioning
Bosch Rexroth AG, axial piston variable pump A4VSO, RE 92050-01-X-B1/2019.08.23
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 contains 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 66.
To test the hydraulic fluid supply:
1. Test the axial piston unit in a non-explosive atmosphere.
2. Allow the drive motor to run at the lowest rotational speed
(per data sheet (Part II)). The axial piston unit should be operated without load.
Pay attention to leaks and noises.
3. Check the axial piston unit's drain line during the test. The leakage fluid should
not contain any bubbles.
4. Increase the load and check whether the working pressure rises as expected.
5. Perform a leak test to ensure the hydraulic system is sealed and can withstand
the maximum pressure.
6. Check the suction pressure at port S of the axial piston pump at nominal speed
and maximum swivel angle. Refer to the data sheet (Part II) for the permissible
value.
7. At maximum pressure, check the case leakage pressure at port t or r(L). Refer
to the data sheet (Part II) for the permissible value.
8.1.5 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 the specified pressures in particular,
e.g. system pressure, boost pressure and case pressure.
▶ Prior to normal operation, measure the heat development with an approved
measuring device without load and with the customer-specific operating data.
The temperature can rise up to the maximum temperature specified on the
data sheet (Part II).
▶ Prior to normal operation, perform a leak test and heat development test without
and with load in a non-explosive atmosphere.
▶ If necessary, disconnect the pressure gauge and plug the ports with threaded
plugs.
WArninG