Malfunction Table - Bosch Rexroth 70 Series Instruction Manual

50/56 Troubleshooting
Table 18: Axial piston unit malfunction table
Malfunction
Unusual noises
Increased, unusual vibration
No or insufficient pressure
Pressure/flow fluctuations or
instabilities
Rotational speed or torque cannot
be reached
Bosch Rexroth AG, A2FM/A2FE/A2FMT Series 70, RE 91071-01-B/06.2018

14.2 Malfunction table

Possible cause
Insufficient air bleeding of the hydraulic system
Output speed too high
Improper mounting of the axial piston unit
Improper mounting of assembled parts,
hydraulic lines or improper installation of the
clutch
Mechanical damage to the axial piston unit
(e.g. bearing damage)
Bearings worn
Insufficient air bleeding of the hydraulic system
Faulty mechanical output drive (e.g. defective
clutch)
Drive power too low
Wear or mechanical damage to the axial piston
unit
Drive unit defective (e.g. hydraulic pump)
Insufficient air bleeding of the hydraulic system
Insufficient flow in hydraulic pump
Hydraulic fluid not in optimum viscosity range
Wear or mechanical damage to the axial piston
motor
Wear or mechanical damage to the hydraulic
pump
Wrong direction of rotation
Remedy
Fill the axial piston unit, suction line for the
hydraulic pump and the reservoir
Completely air bleed the axial piston unit and
hydraulic system
Check correct installation position
Machine/system manufacturer: reduce output
speed
Check the mounting of the axial piston unit
according to the specifications of the machine/
system manufacturer (observe tightening
torques)
Mount assembled parts according to the
information provided by the clutch or fitting
manufacturer
Replace axial piston unit
Contact Bosch Rexroth Service
Contact Bosch Rexroth Service
Fill the axial piston unit, suction line for the
hydraulic pump and the reservoir
Check correct installation position
Contact machine/system manufacturer
Contact machine/system manufacturer
Replace axial piston unit
Contact Bosch Rexroth Service
Contact machine/system manufacturer
Fill the axial piston unit, suction line for the
hydraulic pump and the reservoir
Completely air bleed the axial piston unit and
hydraulic system
Check correct installation position
Check function of the hydraulic pump
Machine/system manufacturer:
check temperature range and use suitable
hydraulic fluid
Replace axial piston unit
Contact Bosch Rexroth Service
Replace hydraulic pump
Contact Bosch Rexroth Service
Check function of the hydraulic pump
Machine/system manufacturer: check correct
direction of rotation; see chapter 7.4.1
"Preparation" on page 28