Troubleshooting 67/72
RE 92050-01-X-B1/2019.08.23, Axial piston variable pump A4VSO, BoschRexrothAG
14.2 Malfunction table
Table 18: Axial piston unit malfunction table
Malfunction Possible cause Remedy
Unusual noises Insufficient air bleeding ofthehydraulic system Axial piston unit, suction line for the
hydraulicpump and filling the reservoir
Completely air bleed theaxial 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, foreign particles
in the suction line, suction filter too small or
blocked, etc.
Machine/system manufacturer: Check
thesystem, e.g. optimize inlet conditions,
usesuitable hydraulic fluid
Fill thesuction line with hydraulic fluid
Remove foreign particles from thesuction line
Check the filter system and change the filter as
necessary
Drive speed too high Machine/system manufacturer:
Reducedrivespeed
Wrong direction ofrotation Machine/system manufacturer: Check correct
direction ofrotation, see chapter 7.4.1
"Preparation" onpage36
Improper mounting oftheaxial piston unit Check themounting oftheaxial piston unit
according tothe specifications ofthemachine/
system manufacturer – observe tightening
torques
Improper mounting ofassembled parts,
hydraulic lines orimproper installation
ofthecoupling
Fasten assembled parts according tothe
information provided bythecoupling 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 the axial piston unit and
hydraulicsystem
Contact BoschRexrothservice:
Optimize the settings of the pressure relief and
pre
ssure control valves
Mechanical damage tothe axial piston unit
(e.g.bearing damage)
Replace axial piston unit
Contact BoschRexrothservice
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