TM-9-2350-311-34-2

CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS HOWITZER, MEDIUM, SELF-PROPELLED, 155MM

TECHNICAL MANUAL; DIRECT AND GENERAL SUPPORT MAINTENANCE MANUAL

SEPTEMBER 1994

TM-9-2350-311-34-2 - Page 489 of 552

TM 9-2350-311-34-2

c. Inspection

1 Inspect valve piston (17) and relief valve seat (18) for nicks, cracks, sharp chamfer, or any wear. Replace

valve piston or relief valve seat if damaged.

2 Measure free length of helical compression spring (3). Replace if less than 1.24 inches (3.15 cm).

3 Inspect four studs (7). If four studs are missing, bent, broken, or have damaged threads, replace as re-

quired.

4 Inspect relief valve plate (8) for any visual sign of wear on the smooth finished inside surface. This surface

will be highly polished and appear to be mirror-like. If damaged, replace safety relief valve assembly (2).

5 Make a magnetic particle inspection of the relief valve plate (8) (MIL-STD-1949).

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