RE 92110-01-B/2022-03-22, Bosch Rexroth AG
Troubleshooting |
A4VSH series 1x and 30 57
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14�2 Malfunction table
Table 14: Axial piston unit malfunction table
Malfunction
Possible cause
Remedy
Unusual noises
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
Drive speed too high
Machine/system manufacturer:
Reduce drive speed
Wrong direction of rotation
Machine/system manufacturer:
Check correct direction of rotation,
see chapter 7.4.1 "Preparation" on page 33
Improper mounting of the axial piston unit
Check the mounting of the axial piston unit
according to the specifications of the machine/
system manufacturer – observe tightening
torques
Improper mounting of assembled parts,
hydraulic lines or improper installation of the
coupling
Fasten assembled parts according to the
parameters provided by the coupling fitting
manufacturer
Resonances due to a defective or unsuitable
elastic coupling
Check the specification of the elastic coupling
and/or exchange defective or worn coupling
Valves and controller vibrate
Optimize the adjustment of the controller of
the axial piston unit and the pressure limitation
in the hydraulic system
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:
Optimize the setting of the pressure limitation
and pressure control valve
Mechanical damage to the axial piston unit
(e.g. bearing damage)
Replace axial piston unit
Contact Bosch Rexroth Service
Anti-cavitation valves are not properly opening
or closing
Contact Bosch Rexroth Service
Increased, unusual vibration
Bearings worn
Contact Bosch Rexroth Service