TM 10-3930-669-34 13-2.      MAST   ASSEMBLY   REPLACEMENT/REPAIR (CONT). (4) Remove   four   screws   (35),   lock   washers   (36), and  two  chain  retainers  (37)  from  cross  head (38).  Discard lock washers. (5) Remove   two   primary   chains   (32)   from   rollers (39). (6) Remove  cross  head  (38)  from  primary  cylinder (40). (7) Remove two screws (41), lock washers (42), and cylinder retainer (43) from  primary  cylinder  (40). Discard lock washers. 13-8