56/60 Troubleshooting
Bosch Rexroth AG
, A10VGT Series 11, RE 92770-01-B/11.2016
Table 13: Axial piston unit malfunction table
Fault
Possible cause
Remedy
Pressure/flow fluctuations/
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 foreign particles from the suction line
Check the filter system and change the filter as
necessary
Pressure-relief valves of the axial piston unit
swing (boost-pressure relief valve, high-
pressure relief valve).
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 temperature of hydraulic
fluid and case
Excessive inlet temperature at the axial
piston unit.
Machine/system manufacturer: inspect system,
e.g., malfunction in the cooler, insufficient
hydraulic fluid in the reservoir
Incorrect setting or malfunction of the pressure
relief valves (high-pressure relief valve)
Optimize the adjustment of the axial piston
unit pressure relief valves and the pressure
limitation in the hydraulic system
Contact Bosch Rexroth Service
Contact machine/system manufacturer
Axial piston unit worn
Replace axial piston unit, contact Bosch
Rexroth Service
