TM 9-2320-361-34 15-38. BORING CASE MAINTENANCE (Contd) g. Auger Rack Bar Installation 1. Manually turn horizontal leveling worm gear (9) until boring case (16) is horizontal (TM 9-2320-361-10). 2. Coat auger rack bar (1) with GAA grease. 3. Place chain on auger rack bar (1) approximately 4ft (1.22 m) from left end. 4. Attach lifting device to chain. WARNING Ensure auger rack bar is balanced on chain during installation. Failure to do so may cause auger rack bar to slip from chain, causing injury to personnel or damage to equipment. NOTE ● Ensure teeth of auger rack bar face to the right. ● Assistant will help with step 5. 5. Insert auger rack bar (1) in boring case (17) until it engages. Continue feeding until it extends approximately two feet out of carrier (10). Remove lifting device and chain. NOTE . Thinnest thrust plate is mounted on shortest stud of thrust plate retainer and installed against teeth of auger rack bar. ● All shims are installed to previously recorded distance. 6. Place thrust plates (11) and (12) in thrust plate retainer (13) and install on carrier (10). 7. Install new shims (14) and rack carrier nut (16) on carrier (10) with two screws (15). 8. Place thrust plates (18) and (22) in thrust plate retainer (19) and install on carrier (10). 9. Install rack carrier nut (20) on carrier (10). Tighten two screws (21). 10. Install derrrick tube case (2) on boring case (17) with six new lockwashers (3) and screws (4). 11. Install auger rack bar guide (8) on auger rack bar (1) with retaining pin (5), new lockwasher (6), and setscrew (7). 15-144