52/56 Troubleshooting
Bosch Rexroth AG
, A10VER Series 52, RE 91706-01-B/09.2015
Table 13: Axial piston unit malfunction table
Fault
Possible cause
Remedy
Rotational speed or torque
cannot be reached
Insufficient flow in hydraulic pump
Check function of the hydraulic pump
Minimum or maximum displacement
set incorrectly.
Contact Bosch Rexroth Service
Control of the control device defective
Check control (machine/system manufacturer)
Insufficient pilot pressure or control pressure
Check pilot pressure or control pressure
Contact Bosch Rexroth Service
Malfunction in the axial piston motor control
device or controller
Contact Bosch Rexroth Service
Hydraulic fluid not in optimum viscosity range
Machine/system manufacturer:
check temperature range and use suitable
hydraulic fluid
Wear or mechanical damage to the axial
piston motor
Replace axial piston unit
Contact Bosch Rexroth Service
Wear or mechanical damage to the
hydraulic pump
Replace hydraulic pump
Contact Bosch Rexroth Service
Wrong direction of rotation
Check function of the hydraulic pump
Machine/system manufacturer: check correct
direction of rotation, see Chapter 7.4.1
“Preparation” on page 30
Excessive temperature
of hydraulic fluid and case
Excessive inlet temperature in the axial
piston unit
Machine/system manufacturer: inspect system,
e.g., malfunction in the cooler, insufficient
hydraulic fluid in the reservoir
Wrong setting or malfunction in the pressure
relief and pressure control valves (e.g., high-
pressure relief valve, pressure cut-off,
pressure controller)
Optimize the adjustment of the pressure
limitation and pressure control valves of the
axial piston unit and the pressure safeguarding
in the hydraulic system
Contact Bosch Rexroth Service
Contact machine/system manufacturer
Output speed too high
Contact machine/system manufacturer
Flushing flow of the flushing valve too low
Contact Bosch Rexroth Service
Axial piston unit worn
Replace axial piston unit, contact
Bosch Rexroth Service