TM 9-2320-209-34-2-2 FRAME 3 1. Put chain tightening shaft assembly (1) in bracket (2). 2. Put key (3) in vertical leveling worm gear shaft (4). 3. Aline keyway in second reduction drive chain sprocket (5) with key (3), and put second reduction drive chain sprocket (5) on vertical leveling worm gear shaft (4). 4. Tighten setscrew (6) and put on safety wire (7). NOTE Follow-on Maintenance Action Required: Replace vertical leveling worm drive chains. Refer to TM 9-2320-209-20. END OF TASK 17-630