Testing The Hydraulic Fluid Supply - Bosch rexroth HS5E Instruction Manual

66/104 A4... with HS5E(V)(L) control system Series 1x and 30 | Commissioning
Bosch Rexroth AG, RE 92076-01-B/2021-04-22
▶ Use a suitable filter system to filter hydraulic fluids during filling to minimize
solid particle contamination 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 44. Also fill the hydraulic lines of the
system.
NOTICE!Risk of property damage due to inadequate lubrication!
Product can be damaged or destroyed!
▶ When using a shut-off valve in the suction line, make sure that the drive of the
axial piston unit can only be started when the shut-off valves are open.
▶ Dimension a shut-off valve in the suction line so that no inadmissible pressure
drop occurs in the suction area when the shut-off valve is open.
3. If you use a shut-off valve in the suction line, only operate the axial piston unit
with opened shut-off valves.
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 direction of
rotation of the axial piston unit matches the details on the name plate, see also
chapter 5.10 "Product identification", Fig. 8: Example name plate A4VSO...HS5EV
control system on page37.
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.
Notes on troubleshooting can be found in chapter 14 "Troubleshooting" on
page 92.
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 max. swivel angle. Refer to data sheet 92050 for the permissible value.
6. At maximum pressure, check the leakage pressure at port K
permissible value, please refer to the data sheets from Table 1 "Required and
supplementary documentation" on page 6.
, or K . For the
1 2