TM 9-2320-361-34 15-37. DERRICK SHEAVE MAINTENANCE THIS TASK COVERS: a. Removal d. Assembly b. Disassembly e. Installation c. Cleaning and Inspection INITIAL SETUP APPLICABLE MODELS REFERENCES (TM) M764 TM 9-237 TM 9-2320-361-10 TOOLS TM 9-2320-361-34P General mechanic’s tool kit (Appendix B, Item 1) EQUIPMENT CONDITION Outside micrometer (Appendix B, Item 17) Parking brake set (TM 9-2320-361-10). MATERIALS/PARTS Lockwasher (Appendix F, Item 141) Two locknuts (Appendix F, Item 108) Graphite grease (Appendix C, Item 9) a. Removal Loosen two screws (11) and remove support block (4) from derrick tube (10). b. Disassembly 1. Remove nut (6), lockwasher (5), screw (12), and pulley (1) from support block (4). Discard lockwasher (5). 2. Remove bearing sleeve (3) from pulley (1). 3. Remove two locknuts (7), screws (9), and sheave cover (8) from support block (4). Discard locknuts (7). I c. Cleaning and Inspection 1. Clean all parts (para. 2-8). 2. Check support block (4) for cracks and other damage. If cracked, repair support block (4) by welding (TM 9-237). Replace if otherwise damaged. 3. Check pulley (1) for cracks and other damage. Replace pulley (1) if worn or damaged. 4. Check bearing sleeve (3) for nicks, burrs, cracks, and wear. Outside diameter should be no less than 1.475 in. (37.5 mm). Raised metal can be removed with a fine mill file. Replace bearing sleeve (3) if worn or damaged. 5. Check sheave cover (8) for bends and other damage. Straighten if bent. Replace sheave cover (8) if damaged. 1. Install sheave cover (8) on support block (4) with two screws (9) and new locknuts (7). 2. Apply graphite grease in bearing (2) and install bearing sleeve (3) in pulley (1). 3. Install pulley (1), screw (12), new lockwasher (5), and nut (6) in support block (4). d. Assembly e. Installation Install support block (4) in derrick tube (10) and tighten two screws (11). 15-128