Bosch Rexroth AG, RE 91485-01-B/2021-11-18
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A10FZO, A10VZO, A10FZG and A10VZG series 10
| Troubleshooting
Tabelle 31: Axial piston unit 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
Open circuit:
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
Closed circuit:
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
Hydraulic fluid not in optimal viscosity range
Machine/system manufacturer:
Check temperature range and use suitable
hydraulic fluid
Insufficient boost pressure
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
