Bosch rexroth A4VSO 10 Series User Manual

70/72 Troubleshooting
BoschRexrothAG, axial piston variable pump A4VSO, RE 92050-01-X-B1/2019.08.23
Table 18: Axial piston unit malfunction table
Malfunction Possible cause Remedy
Pressure/flow fluctuations/
instabilities
Insufficient air bleeding ofthehydraulic system Axial piston unit, suction line for the
hydraulicpump and filling the reservoir
Completely air bleed the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, foreign particles
in the suction line, suction filter too small or
blocked, 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
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
hydraulicsystem
Contact BoschRexrothservice
Unstable control signal Contact machine/system manufacturer or
BoschRexrothservice
Malfunction inthe control devices
orthecontroller
Contact BoschRexrothservice
Excessively high temperature
ofhydraulic fluid and housing
Excessively high inlet temperature attheaxial
piston unit
Machine/system manufacturer: Inspect system,
e.g. malfunction inthe cooler, insufficient
hydraulic fluid inthe reservoir
Wrong setting or malfunction of the
pressure relief and pressure control valves
(e.g.high-pressure relief valve, pressure cut-off,
pressure controller)
Optimize the adjustment of the pressure
relief and pressure control valves of the
axialpistonunit and the pressure limitation in
the hydraulicsystem
Contact BoschRexrothservice
Contact machine/system manufacturer
Flushing flow of the flushing valve too low Contact BoschRexrothservice
Axial piston unit worn Replace axial piston unit;
contactBoschRexrothservice

Bosch rexroth A4VSO 10 Series Specifications

General

Brand	Bosch
Model	rexroth A4VSO 10 Series
Category	Water Pump
Language	English