Moog D633-A Series, Руководство пользователя

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11 Service Maintenance
© Moog GmbH User Manual "D633-A Series" (CA80942-001; Version 1.0, 12/08) 58
11.2 Maintenance
Embrittlement of the
sealing materials
Changes in temperature, effects of the hydraulic fluid, such as e.g., pressure
peaks, and similar influences can, depending on the application, expose the
sealing materials to different levels of wear. This in turn may cause leaks.
In order to avoid possible resulting impairments or damage, we recommend
that the valve, after a period of storage or operation of more than 5 years, be
inspected by us or one of our authorized service centers.
11.2.1 Checking and replacing the port O-rings
11.2.1.1 Tools and materials required
Tools and materials
required for checking and
replacing the O-rings
The following are required for checking and replacing the port O-rings:
• Torque wrench for hexagon socket head cap screws WAF 4
(for removing and mounting the valve)
• If necessary, replacement for port O-rings to be replaced
Ö Chapter "13.2 Spare parts", page 66
11.2.1.2 Checking and replacing the O-rings
Procedure for checking
and replacing the O-rings
Procedure:
1. Remove the valve.
Ö Chapter "11.1 Removing the valves", page 57
2. Check for presence, elasticity, integrity and correct seating of the O-rings
in the valve ports (A, B, P, T, etc.).
3. Replace hardened and damaged O-rings with new O-rings.
4. Remount the valve.
Ö Chapter "7.3 Mounting the valves", page 38
If the valve is exposed to high loads, it may be necessary to reduce the
check/inspection interval to suit the application.