TM-9-2350-311-34-2 Maintenance Manual for Volume 2 M109 Cab Download
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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). 14-29