TM 10-3930-669-20 14-4.  SIDE SHIFT CHAIN ADJUSTMENT (CONT). (6) Start engine (TM 10-3930-669-10). (7) Using side shift, move mast to left to relieve tension on two chains (7). (8) Stop engine (TM 10-3930-669-10). (9) Tighten or loosen two screws (8), as required, until two chains (7) are tight. (10) Install two locking plates (3) on support (4) with two washers (2) and screws (1). 14-8