Bosch rexroth 12 Series - Page 56

BoschRexrothAG, RE 92802-01-B/2023-03-27
56/60 A15VSO/A15VLO series 12 | Troubleshooting
Table 12: Axial piston unit malfunction table
Malfunction Possible cause Remedy
No or insufcient pressure Insufcient 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
Insufcient suction conditions,
e.g.,insufcient dimensioning of the suction
line, viscosity of the hydraulic uid too high,
suction height too high, suction pressure
too low, foreign particles in the suction line,
impermissible lter in the suction line
Machine/system manufacturer:
Check the system, e.g.optimize inlet
conditions, use suitablehydraulic uid
Fill the suction line with hydraulic uid
Remove foreign particles from the suction line
Hydraulic uid not in optimal viscosity range Machine/system manufacturer:
Check temperature range and use suitable
hydr
aulic uid
Insufcient 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/ow uctuations/
instabilities
Insufcient 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
Insufcient suction conditions,
e.g.,insufcient dimensioning of the suction
line, viscosity of the hydraulic uid too high,
suction height too high, suction pressure
too low, foreign particles in the suction line,
impermissible lter in the suction line
Machine/system manufacturer:
Check the system, e.g.optimize inlet
conditions, use suitablehydraulicuid
Fill the suction line with hydraulicuid
Remove foreign particles from the suction line
Valves 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