90/104 Troubleshooting
Bosch Rexroth AG, A4... with HS5E pilot control valve/Series 3x, RE 92076-01-B/10.2017
Table 26: 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
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, contaminants
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
Hydraulic fluid not in optimum viscosity range Machine/system manufacturer:
check temperature range and use suitable
hydraulic fluid
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
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