TM 9-2320-209-34-2-2 h. Replacement. FRAME 1 Soldier A 1. Put on rack carrier nut (1). 2. Put chain hoist (2) in place as shown. Put in two capscrews with flat washers (3). Soldier B 3. Guide boring case gear assembly (4) in place when soldier A lowers it into boring gear case (5). Soldier A 4. Lower boring case gear assembly (4) into boring gear case (5). 5. Take out two capscrews with flat washers (3). Take off chain hoist (2) . 6. Take out rack carrier nut (1). GO TO FRAME 2 17-514