TM 10-3930-669-20 17-10.  MAIN HYDRAULIC SYSTEM HOSE AND TUBE REPLACEMENT (CONT). (2) Installation. (a)   Install fourth clamp half(53) on mast (29). (b)   Install tube (59) on fitting (60) and 90°  adapter (61). (c)   Install second and third clamp halves (53) and safety plate (58) with two stack bolts (57). (d)   Install tube (54) on 90°  adapter (55) and fitting (56). (e)   Install clamp half (53) and cover plate (52) with two screws (51). (f) Install tube (49) on adapter (48) and elbow (50). 17-42