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Axial piston units
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Troubleshooting
Bosch Rexroth AG, RE 90300-B/2021-01-19
Table 9: Axial piston pump malfunction table
Malfunction
Possible cause
Remedy
Pressure/flow fluctuations/
instabilities
Insufficient air bleeding of the hydraulic
system
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
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,
impermissible or contaminated filters in the
suction line
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
If necessary, check the filter system and replace
the filter
Valve and controller vibrate
Optimize the adjustment of the controller of the
axial piston unit and the pressure limitation in the
hydraulic system
Air bleed the axial piston unit and hydraulic system
Contact Bosch Rexroth Service:
Optimize the setting of the pressure limitation and
pressure control valve
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 and/or malfunction of the
pressure limitation and pressure control
valves (e.g. high-pressure relief valve,
pressure cut-off, pressure controller
,
pressure reducing valve)
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
(relevant for axial piston units with flushing
valve)
Contact Bosch Rexroth Service
Axial piston unit worn
Replace axial piston unit; contact Bosch Rexroth
Service
