3-137.7. RELIEF VALVE - MAINTENANCE INSTRUCTIONS (Continued).
All parts must be thoroughly cleaned and kept clean during
inspection and assembly. Contamination in the unit will
cause excessive wear, leakage and decreased service life.
Clean in accordance with standard procedures for hydraulic
parts. Do not use compressed air to dry parts unless the
air is completely filtered in order to remove water and
Check that they are
clean and unobstructed.
Inspect for nicks and
Inspect for wear.
Inspect for scoring or wear.
Minor scratches can be removed
with crocus cloth.
Inspect the body bore for scoring
and wear. If excessive wear or
scoring is evident on the pistons,
the body bore is most likely damaged.