TM 9-2320-209-20-3-3 18-13. COMPANION SEAT REPAIR (EARLY MODEL TRUCKS). TOOLS: Pliers 1/2-inch wrench (2) SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. NOTE Repair of companion seat is limited to removal and replacement of seat cushion and backrest. a. Removal. FRAME 1 1. NOTE All trucks except trucks M275A1 and M275A2 have same hinge pins on both sides of companion seat. Trucks M275A1 and M275A2 have clevis pins (1) with cotter pin (2) on right side of seat and clevis pin welded to frame on left side of seat. Check hinge pin to see if it is a clevis pin or a bolt. If it is a clevis pin, go to step 1. If it is a bolt, go to frame 2. Using pliers, pull out two cotter pins (2). Push out and take away two clevis pins (1). GO TO FRAME 3 18-38