Malfunction Table - Bosch Rexroth 3 Series Instruction Manual

60/68 Troubleshooting
Table 14: Axial piston unit malfunction table
Malfunction
Unusual noises
Increased, unusual vibration
Bosch Rexroth AG, A4CSG, Series 3x, RE 92105-01-B/06.2017

14.2 Malfunction table

Possible cause
Insufficient air bleeding of the hydraulic system
Insufficient suction conditions, e.g. insufficient
dimensioning of the suction line, viscosity of
the hydraulic fluid too high, suction height too
high, suction pressure too low, foreign particles
in the suction line, suction filter too small or
blocked
Drive speed too high
Wrong direction of rotation
Improper mounting of the axial piston unit
Improper mounting of assembled parts,
hydraulic lines or improper installation of the
coupling
Oscillate pressure limitation and pressure
control valves of the axial piston unit (boost
pressure-relief valve, high-pressure relief valve,
pressure cut-off)
Mechanical damage to the axial piston unit
(for example, bearing damage)
Bearings worn
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: check the
system, for example, optimize inlet conditions,
use suitable hydraulic fluid
Fill the suction line with hydraulic fluid
Remove foreign particles from the suction line
Check the filter system and change the filter as
necessary
Machine/system manufacturer: reduce drive
speed
Machine/system manufacturer: check correct
direction of rotation, see chapter 7.4.1
"Preparation" on page 32
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 coupling or fitting
manufacturer
Air bleed the axial piston unit and hydraulic
system
Contact Bosch Rexroth Service:
Optimize the settings of the pressure relief and
pressure control valves
Replace axial piston unit
Contact Bosch Rexroth Service
Contact Bosch Rexroth Service