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Troubleshooting and fault correction
Bosch Rexroth AG
, DB...5X/...XC, RE25802-XC-B/07.19
Error
Possible cause(s)
Remedy
Sealing of the
connection between
main stage and
pilot control valve
is damaged or missing.
The lead seal has been
destroyed by the operating
personnel or mechanical
influence.
Send valve to Bosch Rexroth for repair,
see chapter 16.1 "List of addresses".
External leakage
The seal of the adjustment
device is worn.
Remove valve and replace it with a new
one or send valve to Bosch Rexroth
for repair,
see chapter 16.1 "List of addresses"
Plug screw at X or Y port
is leaking; seal ring at the
plug screw is worn
Replace plug screw; make sure the
sealing surface is intact.
Screw-in the plug screw and tighten it
using the specified tightening torque,
see chapter 10.5.2 "Rectifying leakage at
port X or Y"
Leakage at the valve
connection surface
The valve is leaking
between the housing and
the connection surface
or pipe fitting. The seal ring
in the housing connection
surface is worn.
Order new seal kit
according to the spare parts list
(see chapter 10.6 "Spare parts")
and replace the seal ring. Install the
valve according to the specifications
in chapter 7 "Assembly".
Leakage at the
transition from the
pilot control valve
to the attached
directional valve
Seal between the pilot
control valve and the
directional valve is worn.
Check whether the sealing surfaces and
seals are intact. Damaged seals may not
be used anymore and must be replaced
by new seals.
Leakage at the
transition from the
main stage to the pilot
control valve
Seal between main stage
and pilot control valve
is worn.
Send valve to Bosch Rexroth for repair,
see chapter 16.1 "List of addresses"
Rotary handle
is destroyed
Transport damage, improper
handling
Send valve to Bosch Rexroth for repair,
see chapter 16.1 "List of addresses"
Name plate
is missing or cannot
be completely read
Replace the valve
Leakage at the
transition from the
pilot control valve
to the cover plate
Send valve to Bosch Rexroth for repair,
see chapter 16.1 "List of addresses"
Following faults due to contamination, it is - in addition to the repair - essential
to check the oil quality and improve it, if necessary, by suitable measures such
as flushing or the additional installation of filters.
