Troubleshooting and fault correction 39/44
RE25802-XC-B/07.19, DB...5X/...XC
Bosch Rexroth AG
14 Troubleshooting and fault correction
14.1 How to proceed for troubleshooting
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Always work systematically and purposefully, even when under time pressure.
Random, thoughtless disassembly and changing of settings might in the worst
case result in the inability to restore the original cause of error.
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First get a general idea of the function of your valve in conjunction with the
overall system
▶
Try to find out whether the valve functioned properly in conjunction with the
overall system before the error occurred.
▶
Try to determine any changes to the overall system in which the valve
is integrated:
– Were there any changes to the application conditions or to the area
of application of the valve?
– Have any changes (e.g. refittings) been made or have 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 or machine used as intended?
– How did the fault become apparent?
▶
Try to get a clear idea of the cause of error. Ask the direct (machine) operator,
if necessary.
The valve is not sensitive to faults as long as the specified application conditions are
complied with, in particular the oil quality and the operating temperature.
Table 11: Fault table
Error
Possible cause(s)
Remedy
Desired operating
pressure cannot be set
Spring broken
- Material fatigue
- Material defect
Remove valve and replace it with a new
one or send valve to Bosch Rexroth
for repair, see chapter 16.1 "List
of addresses"
Valve responds at
insufficient pressure.
Response pressure set
wrongly
Set a different response pressure,
see chapter 9.2 "Setting the valve to the
desired response pressure"
A valve with unsuitable
pressure rating has been
installed.
Check the specified pressure rating
of the valve at the name plate.
Select and order a valve with suitable
pressure rating.
Valve only responds
at excessive pressure.
Response pressure set
wrongly.
Set a different response pressure,
see chapter 9.2 "Setting the valve to the
desired response pressure"
Valve is oscillating
The valve, together
with other components,
constitutes an oscillating
system in which there are
regulating oscillations.
Find cause and take remedial action
Fault table
