Bosch rexroth A4VSH Series Instruction Manual page 58

58/64 A4VSH series 1x and 30 | Troubleshooting
Table 14: Axial piston unit malfunction table
Malfunction
No or insufficient flow
Bosch Rexroth AG, RE 92110-01-B/2022-03-22
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, suction filter too
small or blocked, etc.
Hydraulic fluid not in optimal viscosity range
Insufficient boost pressure
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
Check the filter system and change the filter as
necessary
Machine/system manufacturer:
Check temperature range and use suitable
hydraulic fluid
Check boost pressure
Contact Bosch Rexroth Service
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