TM 9-2320-209-20-3-3 18-63. MANHOLE COVER (M50A3) REMOVAL, REPAIR, AND REPLACEMENT. TOOLS: 9/16-inch open end wrench (2) Scraper Rubber mallet SUPPLIES: Gasket cement Solvent, dry cleaning, Type 11 (SD-2), Fed. Spec. P-D-680 PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Removal. FRAME 1 1. Take off padlock (1). 2. Using 9/16-inch open end wrenches, unscrew and take off nut (2) and washer (3). 3. Take out bolt (4). 4. Spread and take off clamp ring (5). 5. Lift off manhole cover (6). END OF TASK 18-352