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Bosch Rexroth AG
Drive modules | RE 51150-B/07.11
Troubleshooting
Impact of defect "A": Excessive / abnormal noises
Table 10:
Fault
Possible causes
Remedy
1
Mechanical drive section
Pump and/or motor fastening loose
Tighten fastening
Pump or motor defective
Replace pump / motor
Wrong direction of rotation
Change around the electrical connections of the
energy supply.
Terminal assignment, see data sheet
2
Suction conditions
Oil level in the tank is too low
Check and remedy the cause of the oil loss, top up
the hydraulic fluid (see also A5)
Ventilation filter contaminated
Clean or replace ventilation filter
Suction line plugged, not tight
Clean, seal the suction line
Location over 1000 m above sea level
Provide for structural changes after consultation with
Bosch Rexroth
3
Pump
Pump seals or pump defective
Exchange pump
Vibrating controller system, e.g. pressure controller Check for sufficient bleeding and correct basic set-
ting of the controller according to the manufacturer
specifications
4
Pressure valves
Flow noises and vibrations due to wrong setting
Check and, if necessary, correct the settings accord-
ing to the specifications in the circuit diagram
5
Hydraulic fluid
Viscosity too high (temperature too low)
Before starting the machine function, temper the
drive module; if necessary, use oil of a lower viscos-
ity class. Admissible hydraulic fluids see data sheet.
Oil foams (proportion of air too great)
Check and remedy the cause of the ingress of air
Impact of defect "B": Insufficient power / torque / pressure in the drives
Table 11:
Fault
Possible causes
Remedy
1
Pressure valves
Operating pressure setting too low
Control of the setting according to the specifications
in the circuit diagram
2
Directional valves
Incorrect spool position (e.g. pressureless circula-
tion; valve does not switch)
Check for jammed plug-in connection and correct
current feed of the solenoid
3
Piping and hose assem-
blies to the drive
Pressure loss too high due to incorrect dimensioning Replace the piping and hose assemblies with larger
nominal widths
4
Other
Total values for flow- and load resistance and/or
leaks too large
Check the hydraulic design after consulting with
Bosch Rexroth
Impact of defect "C": The pump is switched on or off too frequently
Table 12:
Fault
Possible causes
Remedy
1
Pump
For machines with accumulators, the pump deliv-
ery volume is too low
Check the design of the pump/accumulator circuit;
enlarge the accumulator, if necessary
2 Accumulator
Tap to the accumulator is closed
Check the spool position at the accumulator module,
the gas pre-load and the settings according to the
circuit diagram
The preset gas pressure is not correct
Operating and set pressures (e.g. pressure switch)
do not correspond to the requirements
