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4� Test the direction of rotation of the drive motor. To do this, run the drive motor
briefly at the lowest rotational speed (inching). Make sure that the direction
of rotation of the axial piston unit agrees with the details of the name plate,
see chapter 5.3 "Product identification", Fig. 3: Name plate A2FO on page 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 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 47.
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 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.
Refer to data sheet 91405 for the permissible value.
6� At maximum working pressure, check the case pressure at port T
data sheet 91405 for the permissible value.
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.
Commissioning | A2FO series 70
WARNING
RE 91405-01-B/2021-05-21, Bosch Rexroth AG
39/52
or T
. Refer to
1
2
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