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Axial piston units
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Troubleshooting
Bosch Rexroth AG, RE 90300-B/2021-01-19
Table 9: Axial piston pump malfunction table
Malfunction
Possible cause
Remedy
No or insufficient flow
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
Faulty mechanical drive
(e.g. defective coupling)
Contact machine/system manufacturer
Drive speed too low
Contact machine/system manufacturer
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 or contaminated filters 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
If necessary, check the filter system and replace
the filter
Hydraulic fluid not in optimal viscosity range Machine/system manufacturer:
Check temperature range and use
suitable hydraulic fluid
Insufficient boost pressure (relevant for
variable pumps in a closed circuit)
Check boost pressure
Contact Bosch Rexroth Service
Insufficient pilot pressure or control
pressure
Check pilot pressure or control pressure
Contact Bosch Rexroth Service
Malfunction of the control device or
controller of the axial piston unit
Contact Bosch Rexroth Service
Control of the control device defective
Check control (contact machine/system
manufacturer or Bosch Rexroth Service)
Wear or mechanical damage to the axial
piston unit
Replace axial piston unit
Contact Bosch Rexroth Service
