Bosch Rexroth AG, RE 91485-01-B/2021-11-18
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A10FZO, A10VZO, A10FZG and A10VZG series 10
| Troubleshooting
Tabelle 31: Axial piston unit 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 filter 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
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
Valve and controller vibrate
Optimize the adjustment of the controller of
the axial piston unit and the pressure limitation
in the hydraulic system
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
Axial piston unit worn
Replace axial piston unit; contact
Bosch Rexroth Service
