proper direction. Refer to insert illustration in
5-16. Cleaning, Inspection and Repair
Clean all metal parts in cleaning solvent, Federal
b. Install assembled shaft (13) and bearings into
Specification P-D-680, or equivalent before inspecting.
worm sleeve (15). Be sure bearings (14) are firmly
Inspect worm shaft for signs of excessive wear, and
against the inner shoulder in the worm sleeve as shown
replace gasket (16). Replace shims (8), (9) and (10)
in the insert illustration.
unless shims are in very good condition. Be sure the
c. Install oil seal (11) into retainer (7). Be sure that
replacement shims are of the same measured thickness
the sealing surface of shaft (13) is clean and free of
as the discarded shims to assure proper shaft end
burrs, and that the seal (11) wiper lips face inward,
clearance of 0.003 to 0.005 inch. If replacement bear-
toward the worm portion of shaft (13).
ings are available, replace bearings (12) and (14). Clean
d. Install gasket (16) on the chain case on which
key (3) using a fine file if necessary, and be sure it fits
the worm sleeve is mounted. Install shims (8) (9) and
snugly in the shaft (13) keyway.
(10) on the face of worm sleeve (15). Place retainer (7)
in the bore of sleeve (15).
e. Install key (3) and secure assembly with nut (2)
Refer to figure 5-4 and assemble the worm shaft a
and cotter pin (1).
a. Preheat bearings (12) and (14) in an oil bath and
install bearing on proper ends of shaft (13).
Connect the propeller shaft to the worm shaft.
Bearings (14) are thrust bearings and must be
assembled so that the thrust is absorbed in the
REPAIR OF BOOM HOIST SHAFT
a. Refer to TM 5-3810-295-12 and perform the
The boom hoist shaft drives the rear drumshaft assem-
bly through a roller chain drive sprocket arrangement
from the left end of the boom hoist shaft, as shown in
(1) Lower boom to the ground.
figure 5-1. The boom is raised and lowered under power
(2) Remove boom hoist clutch.
trough a planetary gear arrangement in the boom hoist
(3) Remove boom hoist bake.
drum, which is mounted on the right end of the boom
(4) Remove rear drum chain case and remove
hoist shaft. The boom hoist shaft, in turn, is worm gear
the rear drum drive chin.
driven by a propeller shaft and worm gear coupled to the
(5) Remove cover that provides access to the
reduction gear output shaft.
horizontal swing shaft drive chain. Loosen the drive
chain. Remove chains from the horizontal swing shaft
sprockets, but do not break the chain at the maser links.
b. After the above has been accomplished the
The boom hoist shaft cannot be removed as an assem-
boom hoist shaft may be disassembled as follows. Refer
bly, and must therefore be disassembled in place.
to figure 5-5.