Bosch rexroth A2FO Series - Page 49

RE91405-01-B/2021-05-21, BoschRexrothAG
Troubleshooting | A2FO series 70 49/52
Table 13: 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h
ydraulic fluid
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
Excessively high temperature of
hydraulic fluid and housing
Excessively high inlet temperature at the
axial piston unit
Machine/system manufacturer: Inspect system,
e.g.malfunction in the cooler, insufficient
hydraulic fluid in the reservoir
Axial piston unit wear Replace axial piston unit; contact
BoschRexrothService