TM 9-2320-361-34 15-40. VERTICAL LEVELING WORM GEAR MAINTENANCE THIS TASK COVERS: a. Removal d. Assembly b. Disassembly e. Installation c. Inspection INITIAL SETUP APPLICABLE MODELS M764 TOOLS General mechanic’s tool kit (Appendix B, Item 1) 1-1/4-in. socket, 1/2-in. dr. (Appendix B, Item 19) MATERIALS/PARTS Six lockwashers (Appendix F, Item 127) Shim set (Appendix F, Item 250) Shim set (Appendix F, Item 251) Shim set (Appendix F, Item 252) Woodruff key (Appendix F, Item 273) Woodruff key (Appendix F, Item 274) REFERENCES (TM) LO 9-2320-209-12-1 TM 9-237 TM 9-2320-361-10 TM 9-2320-361-20 TM 9-2320-361-34P EQUIPMENT CONDITION . Parking brake set (TM 9-2320-361-10). . Vertical leveling worm drivechain removed (TM 9-2320-361-20). GENERAL SAFETY INSTRUCTIONS Place derrick in cradle or support boring case to prevent case from turning. a. Removal WARNING 1. 2. 3. 4. 5. 6. Before removing vertical leveling worm gear housing, place derrick in cradle or place supports under boring case to prevent case from turning. If boring case turns, injury to personnel or damage to equipment may result. Remove safety wire (3), loosen setscrew (4), and remove sprocket (5) and woodruff key (13) from shaft (14). Discard safety wire (3) and woodruff key (13). Loosen nut (7) and remove sprocket (2) from bracket (6). Remove safety wire (3), two screws (19), washers (18), and shims (17) from intermediate case (20) and worm gear housing (16). Record thickness of shims (17). Discard safety wire (3) and shims (17). Remove two screws (24), lockwashers (23), and washers (22) from bracket (6) and power leveler housing (21). Discard lockwashers (23). Remove screws (8) and (9), two lockwashers (10), bracket (6), and shims (1) and (11) from power leveler housing (23) and shaft (14). Discard shims (1) and (11) and lockwashers (10). Remove safety wire (3), four nuts (15), worm gear housing (16), and shims (12) from intermediate case (20). Record thickness of shims (12) and discard. 15-152