TM 55-1680-320-23 & P
3-15. BOOM HEAD ASSEMBLY - REPAIR (cont)
3-15
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Remove left hand side cover assembly (30)
by removing bolts (31) and washers (32).
Remove shim (33) from bearing bore of cover
(30).
Remove nut (67) and washer (68) from spur
gear shaft (70). Remove right hand side cover
assembly (30) by removing bolts (31) and
washers (32).
Remove and discard packings (34) from
covers (30).
Remove sight plugs (35), as required, using
a small drive pin,
Remove gear assembly (36), thrust washer
(37) and pin (38) from main housing assembly
(39).
Remove thrust washer (40) from sheave shaft
(41). Rotate clutch assembly (42) and remove.
Remove thrust washer (43). Remove and
retain shim (44) if installed.
Remove thrust washer (45) from sheave shaft
(41). Rotate brake assembly (46) and remove.
Remove thrust washer (47).
Remove worm gear (48) and thrust washer (49) from main housing (39). Remove pin (50) if damaged.
Remove retainer assembly (51) by removing screws (52). Remove and discard packing (53).
NOTE
Sheave shaft (41) is difficult to remove. Apply adequate force to abaft end using a rawhide mandrel or
suitable tool.
Drive sheave shaft (41) from bearing (54) in main housing assembly (39). Slide sheave assembly (55) out through
top of main housing assembly.
Remove packing (56) and machine key (57) from sheave shaft (41). Discard packing.
Using suitable tool, press seal assembly (58), sheave spacer (59), bearing (54) and shims (60) from main housing
assembly (39).
Remove lockwire from retaining screw (61) and discard. Remove screw, releasing flexible drive shaft (62).
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