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Troubleshooting
Table 13: Axial piston unit malfunction table
Malfunction
Unusual noises
Increased, unusual vibration
Bosch Rexroth AG, Series 35 A4VG, RE 92035-01-B/04.2018
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, etc.
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
clutch
Oscillate pressure limiting and control valves in
the axial piston unit (boost-pressure relief valve,
high-pressure relief valve, pressure reducing
valve)
Mechanical damage to the axial piston unit (e.g.
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, 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
Machine/system manufacturer: Reduce drive
speed
Machine/system manufacturer: Check correct
direction of rotation; see Chapter 7.4.1
"Preparation" on page 34
Check the mounting of the axial piston unit
according to the specifications of the machine/
system manufacturer (observe tightening
torques)
Fasten assembled parts according to the
information provided by the clutch or fitting
manufacturer
Air bleed the axial piston unit and hydraulic
system
Contact Bosch Rexroth Service: Optimize the
setting of the pressure limitation and pressure
control valve
Replace axial piston unit
Contact Bosch Rexroth Service
Contact Bosch Rexroth Service
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