13.3
Malfunctions axial piston unit
Malfunction
Possible cause
Remedy
Remarkable noises
Input speed too high.
Machine or system manufacturer.
Wrong direction of rotation.
Please observe correct direction of rotation.
Unsufficient suction behavior, e.g. air in the suc‐
tio port, unsufficient diameter of the suction port,
too high viscosity of the hydraulic fluid, too high
suction height, too low suction pressure, foreign
bodies in the suction port.
Machine- or system manufacturer (e.g. optimize
intake relations, use suitable hydraulic fluid).
Completely bleed the axial piston unit, fill the
suction port with hydraulic fluid.
Remove foreign bodies in the suction port.
Improper fastening of the axial piston unit.
Check the fastening of the axial piston unit ac‐
cording to the specifications of the machine- or
system manufacturer. Observe the tightening
torques.
Improper fastening of mounted parts, e.g. cou‐
pling or hydraulic lines.
Fasten the attachment parts according to the
specifications of the coupling or fittings manu‐
facturer.
Pressure limitation valve of the axial piston unit Contact Bosch Rexroth service.
Mechanical damage of axial piston unit (e.g.
damaged bearings).
Change axial piston unit and contact Bosch
Rexroth service.
No or too less volume
flow rate
Defective mechanical drive (e.g. defective cou‐
pling).
Machine or system manufacturer.
Input speed too low.
Machine or system manufacturer.
Unsufficient suction behavior, e.g. air in the suc‐
tio port, unsufficient diameter of the suction port,
too high viscosity of the hydraulic fluid, too high
suction height, too low suction pressure, foreign
bodies in the suction port.
Machine- or system manufacturer (e.g. optimize
intake relations, use suitable hydraulic fluid).
Completely bleed the axial piston unit, fill the
suction port with hydraulic fluid.
Remove foreign bodies in the suction port.
Hydraulic fluid not in optimum viscosity range.
Use suitable hydraulic fluids (machine- or sys‐
tem manufacturer).
External control of the adjusting device defec‐
tive.
Check external control unit (machine- or system
manufacturer).
To low control pressure or set pressure.
Check control pressure or set pressure and
contact Bosch Rexroth service.
Malfunction of adjusting device or of the control‐
ler of the axial piston unit.
Contact Bosch Rexroth service.
Wear of axial piston unit.
Change axial piston unit and contact Bosch
Rexroth service.
Mechanical damage of axial piston unit.
Change axial piston unit and contact Bosch
Rexroth service.
DOK-SYTROX-MPES2******-IT01-EN-P
Rexroth Sytronix FcP 50xx/70xx Motor-Pump Unit MPES2
Bosch Rexroth AG
93/143
Troubleshooting
LSA Control S.L. www.lsa-control.com [email protected] (+34) 960 62 43 01