Bosch Rexroth AG, RE 92110-01-B/2022-03-22
60
/64
A4VSH series 1x and 30
| Troubleshooting
Table 14: Axial piston unit malfunction table
Malfunction
Possible cause
Remedy
Pressure/flow fluctuations or
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, 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 relief valves and pressure
control valves in the axial piston unit
(boost-pressure relief valve, high-pressure
relief valve)
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 and/or malfunction of the
pressure limitation 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
