TM 55-1680-320-23 & P
3-15. BOOM HEAD ASSEMBLY - REPAIR (cont)
Install flexible drive shaft (62) so that shaft bottoms out in boom head
in boom head housing (39).
Secure flexible drive shaft (62) using retaining screw (61). Safety wire
Install clamp (63) using nut (64), washer (65) and bolt (66).
assembly. Worm of shaft must be visable
screw to side housing when installed using
Rotate flexible drive shaft (62) to ensure smooth operation, free of binding.
Lubricate packing (56). Install machine key (57) and packing on sheave shaft (41).
Install shim (58) into main housing (39). Using a suitable tool, press bearing (54) and seal (59) into housing.
Install spacer (60).
Slide sheave assembly (55) through top of main housing assembly (39) and install sheave shaft (41) in
main housing assembly so that machine key (57) aligns with corresponding hole in sheave assembly and sheave
shaft locks in place. Remove or install shims (60) to achieve 0.003-0.010 in. (0.008-0.025 cm) end play of sheave.
Ensure sheave is centered within 0.010 in. (0.025 cm) of main housing assembly centerline.
Lubricate packing (53) and install on retainer assembly (51).
Install retainer assembly (51) on main housing assembly (39) and secure using screws (52).
Install pin (50), thrust washer (49) and worm gear (48).
Install thrust washer (47) on sheave shaft (41). Install brake assembly (46) with spring end out on sheave shaft
and rotate brake assembly to lock in place. Install thrust washer (45) on sheave shaft.
Install thrust washer (43) on sheave shaft (41). Install clutch assembly (42) with spring end out on sheave
shaft and rotate clutch to lock in place. Install thrust washer (40) on sheave shaft.
Install pin (38), thrust washer (37) and gear assembly (36) with hub side in on main housing assembly (39).
Lubricate side cover packings (34) and install on side cover assemblies (30). Install sight plugs (35) on side cover
assemblies using adhesive.
Install side cover assembly (30) and secure using bolts (31)
aa. Install nut (67) and washer (68) onto spur gear shaft (70).
ab. Install left hand side cover assembly (30) and secure
and washers (32). Torque bolts to 20-25 in-lbs.
Torque nut to 20.25 in-lbs.
using bolts (31 ) and washers (32). Torque bolts to
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