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A4... with HS5E(V)(L) control system Series 1x and 30
| Troubleshooting
Bosch Rexroth AG, RE 92076-01-B/2021-04-22
14.3 Malfunction table
Table 27: 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, 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
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 45
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
Valve and controller vibrate
Optimize the adjustment of the controller
of the axial piston unit and the pressure
limitation in the hydraulic system
Mechanical damage to the axial piston unit
(e.g. bearing damage)
Replace axial piston unit
Contact Bosch Rexroth Service
Increased, unusual vibration
Bearings worn
Contact Bosch Rexroth Service