Bosch rexroth 1 Series - Page 63

Troubleshooting 63/68
RE 93100-01-B/2019-09-10, A20V(L)O Series 1, Bosch Rexroth AG
Table 21: 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