TM 9-2320-361-20 11-27. DRIVER’S SEAT BASE MAINTENANCE (Contd) 8. Install spring (2) in seat base (3) and top frame (6). 9. Install two brackets (9) on seat base (3) with four screws (10), new lockwashers (8), and nuts (7). 10. Install shock absorber (5) on top frame (6) and seat base (3) with two screws (4) and nuts (1). FOLLOW-ON TASKS: Install seat cushion, backrest, frame, and seat adjuster (para. 11-29). Install driver’s seat (para. 11-28). 11-48