TM 9-2320-361-34 15-38. BORING CASE MAINTENANCE (Contd) 6. Install rack carrier nut (1) on rack carrier (2). 7. Install chain on rack carrier nut (1) with two washers and screws. 8. Remove eight screws (7), lockwashers (6), inspection cover (5), and gasket (4) from boring case (3). Discard lockwashers (6) and gasket (4). WARNING All personnel must stand clear during lifting operations. A swinging or shifting load may cause injury to personnel. NOTE Assistant will help with step 9. 9. Attach lifting device to chain and position rack carrier (2) in boring case (3). 10. Remove lifting device, two screws, washers, and chain from rack carrier nut (1). 11. Remove rack carrier nut (1) from rack carrier (2). 12. Install boring case cover (8) on boring case (3) with ten new lockwashers (10), nine screws (9), and circular level (11). 13. Rotate boring case (3) 90 degrees until inspection hole (12) is facing upwards. 15-140