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Maintenance Schedule; Repair; Rectifying External Leakages - Bosch Rexroth H-4WEH...XE Series Operating Instructions Manual

4/2 and 4/3 directional valves, internally pilot-operated, externally pilot-operated
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10.3 Maintenance schedule

Valves are low-maintenance provided that they are used as intended.
To ensure that the valve functions reliably for a long time, Rexroth recommends
checking the hydraulic system and the valve regularly.
10.3.1 Checking for leakage
Check the valve for leakage. Early detection of hydraulic fluid loss may help you
identify and remedy errors. Bosch Rexroth therefore recommends always keeping the
valve and/or the system clean.
10.3.2 Checking for noise development
Check the valve for noise development. Based on noise development or the increase
of noise development, a possible failure of one or several components can be
recognized in time and consequential damage can be avoided.
10.3.3 Checking the mounting elements
Check the mounting elements for tight seat. All mounting elements are to be
checked when the system is switched off, depressurized and has cooled down.

10.4 Repair

Explosion hazard caused by improper repair!
In case of improper repair, the explosion protection no longer applies in subsequent
For repair, the valve may only be disassembled to the extent described in these
operating instructions.
Defective parts may only be replaced by new, interchangeable, tested
components in original equipment quality.

10.5 Rectifying external leakages

External leakage at the valve connection surface can be rectified on site. Other
leakages have to be rectified by specialists of the manufacturer.
10.5.1 Rectifying leakage at the valve connection surface
Remove the safety valve, see chapter 11 "Disassembly and removal".
Check the contact surfaces for the seal rings at the valve for cleanliness and
Check the recesses and seal rings of the connection flanges for cleanliness and
Dry the valve connection surface and the valve contact surface using suitable
cleaning materials.
Assemble the new sealing devices.
Assemble the valve at the contact surface, see chapter 7 "Assembly".
Maintenance and repair
RE 24751-XE-B/04.16, H-4WEH...XE..., Bosch Rexroth AG



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