Malfunction Table - Bosch rexroth A2FO Series Instruction Manual

48/52 A2FO series 70 | Troubleshooting
Table 13: Axial piston unit malfunction table
Malfunction
Unusual noises
Increased, unusual vibration
No or insufficient flow
Bosch Rexroth AG, RE 91405-01-B/2021-05-21
14�2 Malfunction table
Possible cause
Insufficient air bleeding of the hydraulic system Fill the axial piston unit, suction line for the
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
Drive speed too high
Wrong direction of rotation
Improper mounting of the axial piston unit
Improper mounting of assembled parts,
hydraulic lines or improper installation of
the coupling
Resonances due to a defective or unsuitable
elastic coupling
Mechanical damage to the axial piston unit
(e.g. bearing damage)
Bearings worn
Insufficient air bleeding of the hydraulic system Fill the axial piston unit, suction line for the
Faulty mechanical drive (e.g. defective coupling) Contact machine/system manufacturer
Drive speed too low
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
Hydraulic fluid not in optimal viscosity range
Wear or mechanical damage to the
axial piston unit
Remedy
hydraulic pump and the reservoir
Completely air bleed the axial piston unit and
hydraulic system
Check correct installation position
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
Machine/system manufacturer:
Reduce drive speed
Machine/system manufacturer: Check correct
direction of rotation, see chapter 7.4.1
"Preparation" on page 28
Check the mounting of the axial piston
unit according to the specifications of the
machine/system manufacturer – observe
tightening torques
Fasten assembled parts according to the
parameters provided by the coupling fitting
manufacturer
Check the specification of the elastic coupling
and/or exchange defective or worn coupling
Replace axial piston unit
Contact Bosch Rexroth Service
Contact Bosch Rexroth Service
hydraulic pump and the reservoir
Completely air bleed the axial piston unit and
hydraulic system
Contact machine/system manufacturer
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
Machine/system manufacturer:
Check temperature range and use
suitable hydraulic fluid
Replace axial piston unit
Contact Bosch Rexroth Service