TM 9-2320-341-20 11-26. COMPANION SEAT MAINTENANCE (Contd) 5. Install link (5) and link (26) on backrest frame (29) with four pins (6), washers (2), and new cotter pins (3). 1. Install backrest (1) on frame (29). 2. Install cushion frame (21) on cab floor (13) with four screw-assembled washers (20). 3. Latch fastener (7) on backrest frame (29). g. Companion Seat Cushion Installation I 1. Install cushion (18) on cushion frame (21) with pin (28), washer (27), and new cotter pin (25). 2. Install link (15) on cushion (18) with screw (4) and new locknut (17). h. Companion Seat Backrest Installation Install backrest (1) on backrest frame (29). 11-43