Troubleshooting 61/68
RE 92003-01-B/12.2015, A4VG Series 32, Bosch Rexroth AG
14.2 Malfunction table
Table 13: Axial piston unit malfunction table
Malfunction 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 contaminants 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
“Preparation” on page37
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
Oscillate pressure limitation and pressure
control valves of the axial piston unit (boost
pressure-relief valve, high-pressure relief
valve, pressure cut-off)
Air bleed axial piston unit and hydraulic system
Contact BoschRexrothService:
optimize the setting of the pressure
limitation and pressure control valve
Mechanical damage to the axial piston unit
(e.g., bearing damage).
Replace axial piston unit
Contact BoschRexrothService
Increased, unusual vibration Bearings worn Contact BoschRexrothService
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