Bosch 70 Series - 14.2 Malfunction Table

Troubleshooting 47/52
RE 91071-01-B/03.2015, A2FM/A2FE Series 70, Bosch Rexroth AG
14.2 Malfunction table
Table 13: Axial piston unit malfunction table
Fault Possible cause Remedy
Unusual noises Insufficient air bleeding of the hydraulic system Fill axial piston unit, suction line for the
hydraulic pump and the reservoir
Completely air bleed axial piston unit and
hydraulic system
Check correct installation position
Output speed too high Machine/system manufacturer: reduce output
speed
Improper mounting of the axial piston unit Check the mounting of the axial piston
unit according to the specifications of the
machine/system manufacturer (observe
tightening torques)
Improper mounting of attachments, hydraulic
lines or improper installation of the coupling
Mount attachments according to the
information provided by the coupling or fitting
manufacturer
Mechanical damage to the axial piston unit
(e.g., bearing damage)
Replace axial piston unit
Contact Bosch Rexroth Service
Increased, unusual vibration Bearings worn Contact Bosch Rexroth Service
No or insufficient pressure Insufficient air bleeding of the hydraulic system Fill axial piston unit, suction line for the
hydraulic pump and the reservoir
Check correct installation position
Faulty mechanical output drive (e.g., defective
coupling)
Contact machine/system manufacturer
Drive power too low Contact machine/system manufacturer
Wear or mechanical damage to the axial piston
unit
Replace axial piston unit
Contact Bosch Rexroth Service
Drive unit defective (e.g., hydraulic pump) Contact machine/system manufacturer
Pressure/flow fluctuations/
instabilities
Insufficient air bleeding of the hydraulic system Fill axial piston unit, suction line for the
hydraulic pump and the reservoir
Completely air bleed axial piston unit and
hydraulic system
Check correct installation position
Rotational speed or torque cannot
be reached
Insufficient flow in hydraulic pump Check function of the hydraulic pump
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28