Bosch Rexroth A15VSO - Page 55

Troubleshooting 55/60
RE 92801-01-B/11.2018, A15VSO/A15VLO Series 11, BoschRexrothAG
Table 15: Axial piston unit malfunction table
Malfunction Possible cause Remedy
No orinsufficient pressure 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
Check correct installation position
Faulty mechanical drive (e.g.defective coupling) Contact machine/system manufacturer
Drive power 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 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optimal viscosity range Machine/system manufacturer:
Check temperature range and use suitable
hydr
aulic 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
Output unit defective (e.g.hydraulic motor
orcylinder)
Contact machine/system manufacturer
Pressure/flow fluctuations/
instabilities
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
Check correct installation position
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
Valve and controller vibrate Optimize the adjustment ofthecontroller
oftheaxial piston unit and the pressure
limitation inthe hydraulic system
Unstable control signal Contact machine/system manufacturer
orBoschRexrothService
Malfunction inthe control devices
orthecontroller
Contact BoschRexrothService