Troubleshooting 53/60
RE 92770-01-B/11.2016, A10VGT Series 11,
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
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, contaminants in
the suction line, suction filter too small, etc.
Machine/system manufacturer: Check the
system, e.g. 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
Drive speed too high
Machine/system manufacturer: reduce drive
speed
Wrong direction of rotation
Machine/system manufacturer: check correct
direction of rotation, see chapter 7.4.1
“Preparation” on page 30
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
Pressure-relief valves of the axial piston unit
swing (boost-pressure relief valve, high-pressure
relief valve).
Air bleed axial piston unit and hydraulic system
Contact Bosch Rexroth Service:
Optimize the setting of the pressure relief
valves
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
