RE 64025-B/2021-08-12, Bosch Rexroth AG
Troubleshooting |
Control blocks for mobile applications
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14�2 Malfunction table
Within the permissible operating conditions, no malfunctions occur at the control
block.
Table 8: Malfunction table
Malfunction
Possible cause
Remedy
Hydraulic fluid is escaping
on the control block or
the valve section
The control block is leaking
Tighten the mounting bolts to the specified tightening
torque.
The threaded plugs are leaking
Tighten the threaded plugs to the specified tightening
torque; possibly renew the copper seal rings.
With O-ring seals:
Do not tighten the threaded plug, renew the seals and
tighten the threaded plug to the specified torque.
If leaks remain:
Check the sealing surfaces/seals for damage.
If necessary, renew the threaded plug.
Control block housing or valve section is
leaking
Remove the control block or the valve section and
replace with a new one.
The ports leading to the actuator (the screw
neck, the fittings) are leaking.
Check seals, replace fittings if necessary. Check
tightening torques, see the parameters provided by the
manufacturer of the fitting.
The valve housing on the secondary valve/
threaded plug is leaking
If necessary, renew the secondary valve/threaded plug.
The seals of assembled parts are leaking
Renew the seals; refer to the spare parts list.
The system pressure is too high
Comply with the pressure limit
Hydraulic fluid leaks from
the supply lines on the
control block.
Pipe or hose lines damaged
Replace pipe or hose lines
Pipelines or hose lines are loose
Tighten the threaded joints and the fittings in
accordance with the installation instructions that
apply to the fittings. You can obtain the corresponding
installation instructions from the machine manufacturer.
The seals are leaking
Renew the seals; refer to the spare parts list.
The port thread is damaged
Remove the control block or the valve section and
replace with a new one.
Hydraulic fluid is leaking
between the valve
sections
The seals on the flange surface are
damaged
Renew the seals; refer to the spare parts list.
Deposition of dirt during the installation of
the control block
Remove the control block, clean the flange surface.
The control block housing on the flange
surface is leaking
Renew the damage valve section.
Tightening torque of tie rod is too low
Check the tightening torques, refer to the spare parts
list.
Residual oil from installation/testing of the
control block
Remove the oil and contaminants from the control
block; when doing this, do not use any cleaning agents
that can adversely affect plastics or whose properties
can change, can adversely affect metals or react with
them or leave residues.
