Bosch Rexroth 11 Series Instruction Manual page 54

54/60 Troubleshooting
Table 15: Axial piston unit malfunction table
Malfunction
No or insufficient flow
Bosch Rexroth AG, A15VSO/A15VLO Series 11, RE 92801-01-B/11.2018
Possible cause
Insufficient air bleeding of the hydraulic system
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
Insufficient pilot pressure or control pressure
Malfunction of the control device or controller
of the axial piston unit
Control of the control device defective
Wear or mechanical damage to the axial piston
unit
Remedy
Fill the axial piston unit, suction line for the
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
Check pilot pressure or control pressure
Contact Bosch Rexroth Service
Contact Bosch Rexroth Service
Check control (contact machine/system
manufacturer or Bosch Rexroth Service)
Replace axial piston unit
Contact Bosch Rexroth Service