TM 9-2350-277-20-4REPLACE DRIVER’S HATCH HOLD-OPEN HOOK AND BUMPER (M577A3 AND M1068A3ONLY) — Continued0533 006. Remove two screws (16), locknuts (17), four washers (18), and block (19) from hull bracket. Discard locknuts.CLEANING1. Check spring.2. Check bumper.REPAIR OR REPLACEMENT1. Replace broken or weak spring.2. Replace bumper that is cut, hard, or has stripped threads.0533 00-2
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