Bosch A4VG A4VG 32 Series User Manual

64/68 Troubleshooting
Bosch Rexroth AG, A4VG Series 32, RE 92003-01-B/12.2015
Table 13: Axial piston unit malfunction table
Malfunction Possible cause Remedy
Pressure/flow fluctuations
or instabilities
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
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 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
Excessive hydraulic fluid
temperature and housing
temperature
Excessive inlet temperature in 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 in the pressure
relief and pressure control valves (e.g., high-
pressure relief valve, pressure cut-off,
pressure controller)
Optimize the adjustment of the pressure
limitation and pressure control valves of the
axial piston unit and the pressure safeguarding
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 A4VG A4VG 32 Series Specifications

General

Brand	Bosch
Model	A4VG A4VG 32 Series
Category	Water Pump
Language	English