Page 14
(3) On roller chain models, remove two fillister head screws
attaching chain stripper to frame and lift out stripper. Chain
stripper on coil chain models is integral with chain guide.
(4) On coil chain models, remove four fillister head screws
attaching chain guide and stripper assembly to hoist frame.
This will free guide to allow sprocket to be pulled through it as
it is removed in step (5). Refer to Figure 7-11.
(5) Rotate internal gear (Figure 7-10) until holes in web
align with six socket head screws securing bearing clamp plate
to frame. Remove internal gear, chain sprocket and ball
bearings as a unit (Figures 7-11 and 7-12). It may be
necessary to tap sprocket to free ball bearings from bores in
frame.
(6) To disassemble intermediate gear, sprocket and ball
bearing assembly, remove retaining ring and pull outer ball
bearing from sprocket. Remove spindle nut from other end of
sprocket and pull internal gear free of sprocket shaft. Remove
clamp plate and pull off remaining ball bearing.
Figure 7-11. Removing Internal Gear, Chain Sprocket
and Ball Bearing Assembly (Roller Chain Model).
10957A
Figure 7-10. Removing Gear Plate
and Intermediate Gears.
10956B
Figure 7-12. Removing Internal Gear, Chain Sprocket
and Ball Bearing Assembly (Coil Chain Model).
10958A
7-3. CLEANING AND INSPECTION. Before reassembly, all
parts should be thoroughly cleaned and inspected to determine
their serviceability. Replace all parts that are excessively worn
or damaged. Minor nicks and scratches should be filed to
remove raised edges.
Note: Bearings that are sealed are lubricated at the
factory for normal life of the bearing and must not be
washed. If they are exposed to wash or infiltration with
foreign matter, they must be replaced.
7-4. REASSEMBLY.
a. General. The procedure to be followed to reassemble hoist
is in reverse order of the disassembly steps outlined in
paragraph 7-2. Listed below are special assembly precautions
which should be observed to assure proper assembly.
b. Assembly of Motor. When reassembling motor, observe
the following precautions:
(1) If any blade replacement is required, the full set of blades
should be replaced. Blades must be installed so that the edges
with chamfered corners face down into the slots.
(2) Reassemble end plate and bearing as follows. Remove
dowel pins locating end plate to body. Support shaft and press
bearing onto shaft, using a drift that contacts both inner and
outer race of bearing. Use a feeler gage between end plate
and body to make sure the bearing is not pressed onto shaft
so far as to bow the end plate. Align dowel pin holes in end
plate with those in body and assemble pins. Assemble three
button head cap screws.
(3) Rotor blade replacement is the only field service
