TM 10-3930-659-34 4-67. CARRIAGE TILT CYLINDER REPAIR (Con’t). 17. Install key (4) and retaining ring (11) on rod (5). 18. Install two spacer rings (2) and extension tube (3) in barrel (1). 19. Apply a coat of petrolatum to outer surface of piston (10). 20. Aline piston (10) with barrel (1), and push piston and guide (9) into barrel. 21. Apply a coat of lubricating oil to threads of four screws (6). 22. Hold barrel (1) securely, and install retainer (8) on barrel with four washers (7) and screws (6).  Torque screws to 660 lb.-ft.  (895 N•m). FOLLOW-ON TASKS: • Install carriage tilt cylinder (see TM 10-3930-659-20). 4-279