Testing The Hydraulic Fluid Supply - Bosch Rexroth A10VER 52 Series Instruction Manual

40/56 Commissioning
Bosch Rexroth AG, A10VER Series 52, RE 91706-01-B/09.2015
To ensure the functional reliability of the axial piston unit, cleanliness level 20/18/15
according to at least ISO 4406 is necessary for the hydraulic fluid. At very high
hydraulic fluid temperatures (90 °C to maximum 110 °C, measured at port l), a
cleanliness level of at least 19/17/14 according to ISO 4406 is necessary.
For permissible temperatures, see data sheet 91706.
1.
Place a collecting pan under the axial piston unit to collect any hydraulic fluid
that may leak.
nOTICE Contaminated hydraulic fluid.
The cleanliness levels of hydraulic fluids on delivery do not normally conform to the
requirements for our components.
▶ Use a suitable filter system to filter hydraulic fluids during filling to minimize solid
impurities and water in the hydraulic system.
2. Fill and air bleed the axial piston unit via the appropriate ports, see
Chapter 7.3 "Installation position" on page 28. The hydraulic lines of the
system must also be filled.
nOTICE Risk of property damage due to improper lubrication.
Product can be damaged or destroyed.
▶ When using a shut-off valve in the drain line, make sure that the drive of the axial
piston unit can only be started when the shut-off valves are open.
3.
When using a shut-off valve in the drain line, only operate the axial piston unit
when the shut-off valves are open.

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 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 50.
To test the hydraulic fluid supply:
1. Allow the axial piston unit to run at low speed and without load. Pay attention
to leaks and noises.
2.
Check the axial piston unit's drain line during the test. The drain fluid should not
contain any bubbles.
3. Increase the load and check whether the working pressure rises as expected.
4.
Perform a leak test to ensure that the hydraulic system is sealed and can
withstand the maximum pressure.
5. At maximum working pressure, check the case pressure at port l. Refer to the
data sheet 91706 for the permissible value.