38/44 Troubleshooting
Bosch Rexroth AG
, 4WRPEH6_3X, 4WRPEH10_3X, 4WRPE6_3X, 4WRPE10_3X, 4WRLE_4X; RE 29118-B/09.2021
14
Troubleshooting
14.1 How to proceed for troubleshooting
▶
Always work systematically and purposefully, even when under time pressure.
Random, thoughtless disassembly and changing of settings can, in the
worst-case-scenario, result in the inability to determine the original cause
of the error.
▶
First, get an overview of the functions of the valve in conjunction with the
overall system.
▶
Try to find out whether the valve has worked properly in conjunction with the
overall system before the error occurred.
▶
Try to determine any changes of the overall system in which the valve is
integrated:
– Were there any changes to the application conditions or area of application of
the valve?
– Were there any changes (e.g.: refitting) or repair works been carried out at the
overall system (machine/system, electrical systems, control) or at the valve?
If so: What were they?
– Was the valve and/or the machine used as intended?
– How did the fault become apparent?
▶
Try to get a clear idea of the cause of error. If necessary, ask the actual (machine)
operator.
14.2 Fault table
The valve is usually not sensitive to faults if the prescribed application conditions
and hydraulic fluid quality are complied with.
14.2.1 Mechanical faults
Table 10: Mech. fault table
Fault
Possible cause
Remedy
Valve does not switch
Insufficient pilot pressure
Check and/or reapply pressure
at the ports.
Control spool is jammed due to
contamination
Remove valve and replace it
with a new one.
Electrical connection is
disconnected
Check whether the electrical
connectors are correctly and
completely mounted.
Check the error memory
(see electrical errors)
Connector defective or damaged Replace the connector
External leakage
Seal at valve connection
surface damaged
Remove the valve and replace the
seals, see chapter 10.3 "Repair"
Other leakage
Replace the valve
