TM 9-2320-361-34 15-38. BORING CASE MAINTENANCE THIS TASK COVERS: a. Auger Rack Bar Removal e. Boring Gear Assembly b. Boring Gear and Case Removal f. Boring Gear and Case Installation c. Boring Gear Disassembly g. Auger Rack Bar Installation d. Cleaning, Inspection, and Repair INITIAL SETUP APPLICABLE MODELS M764 TOOLS General mechanic’s tool kit (Appendix B, Item 1) Mechanical puller kit (Appendix B, Item 22) Dial indicator (Appendix B, Item 21) Inside micrometer (Appendix B, Item 16) Outside micrometer (Appendix B, Item 17) Two puller screws (Appendix F, Item 216) Lifting device Two screws (Appendix F, Item 215) Two washers (Appendix F, Item 270) MATERIALS/PARTS Shim set, rack carrier bearings (Appendix F, Item 246) Shim set, rack feed idler gear bearings (Appendix F, Item 247) Shim set, rack drive gear (Appendix F, Item 248) Shim set, rack carrier upper nut (Appendix F, Item 245) Seal retainer (Appendix F, Item 204) Seal (Appendix F, Item 223) Two cotter pins (Appendix F, Item 9) Twelve lockwashers (Appendix F, Item 140) Lockwasher (Appendix F, Item 137) Ten lockwashers (Appendix F, Item 127) Nine lockwashers (Appendix F, Item 142) MATERIALS/PARTS (CONTD) Lockwasher (Appendix F, Item 150) Two felt pads (Appendix F, Item 26) GAA grease (Appendix C, Item 8) Safety wire (Appendix C, Item 31) PERSONNEL REQUIRED Two REFERENCES (TM) LO 9-2320-209-12-1 TM 9-214 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). ● Integral derrick removed (para. 15-36). ● Snatch sleeve removed (TM 9-2320-361-20). GENERAL SAFETY INSTRUCTIONS ● Ensure auger rack bar is properly balanced on chain during removal and installation. ● All personnel must stand clear during lifting operations. ● Support boring case before removing hardware. ● Ensure lifting capacity is greater than weight of boring gears. I a. Auger Rack Bar Removal 1. Remove six screws (4), lockwashers (3), and derrick tube base (2) from boring case (16). Discard lockwashers (3). 2. Remove setscrew (7), lockwasher (6), retaining pin (5), and auger rack bar guide (8) from auger rack bar (1). Discard lockwasher (6). 3. Install chain on auger rack bar (1). Attach lifting device to chain. WARNING Ensure auger rack bar is balanced on chain during removal. Failure to do so may cause auger rack bar to slip from chain, causing injury to personnel or damage to equipment. NOTE Assistant will help with step 4. 4. Feed auger rack bar (1) out of boring case (16) until it disengages (TM 9-2320-361-10). 15-130