TM 9-2320-209-34-2-2 b. Removal. FRAME 1 1. Take off and throw away safety wire (1). 2. Loosen setscrew (2) in second reduction drive chain sprocket (3) three turns. 3. Pull off second reduction drive chain sprocket (3) from gear shaft (4). 4. Take out sprocket retaining key (5) 5. Loosen screw (6) three turns. 6. Pull chain tightening shaft assembly GO TO FRAME 2 from vertical worm (7) out of bracket vertical leveling worm gear shaft (4). (8). 17-610