Note. Do not remove bushings or bearings
unless replacement is required.
(6) Remove bearings (7) from two horizontal
sheaves (6).
(7) Remove bearings (2) from two vertical
sheaves (1).
(8) Remove six lubrication fittings (3) and
bushings (4) from two shafts (16 and 27), and two pins
(8).
(9) Reassemble by reversing steps (1)
through (8) above.
c. Cleaning, Inspection and Repair.
(1) Clean all parts with an approved cleaning
solvent and dry thoroughly.
(2) Visually inspect all bushings and bearings
for scoring, or excessive wear; sheave shafts for
excessive wear; sheaves for cracks, bends, or
excessive wear; mounting base and frame for bends,
cracks, or breaks, and mounting hardware for stripped
threads, elongated hole, or other defect.
(3) Repair by welding cracks, or breaks
straightening bends, or replacement of parts, re pair of
which is beyond scope of organizational maintenance.
Replace defective bearings, bushings, or mounting
hardware.
4-17. Clamshell Bucket and Teeth
a. Description. The clamshell bucket consists of
Figure 4-15. Clamshell bucket teeth replacement.
two halfscoops, hinged together at top so that they will
close over material to be picked up. Bucket opens when
jaws (fig. 4-15), and secure with bolts, lockwashers, and
closing line is allowed to run free, closes when pressure
nuts.
on hoist brake is slackened and crowd and retract clutch
d. Bucket Installation.
is engaged.
(1) Position boom over bucket, reeve holding
b. Removal.
and closing cables (fig. 2-9), and secure to dead end
(1) Lower open bucket to ground until there is
sockets on buckets.
slack in the holding and closing cables.
(2) Attach tagline to bucket.
(2) Disconnect tagline from bucket and wind
tagline on winder drum.
4-18. Dragline Bucket and Teeth
(3) Disconnect both holding and closing
a. Removal.
cables at dead end sockets on bucket (fig. 2-9) and
(1) Lower dragline bucket to ground then
slowly wind cables on drums, as ends are guided
slacken hoist and drag cables.
through sheaves.
(2) Remove drag, hoist, and dump cables
c. Clamshell Bucket Teeth Replacement.
from dead end (fig. 4-16).
(1) Removal. Position bucket on its side,
(3) Wind cables on drum, slowly, as cable
remove 30 nuts, (fig. 4-15), lockwashers, and bolts, and
ends are guided through sheaves (fig. 2-12).
six teeth from clam jaws.
b. Bucket Teeth Replacement.
(2) Cleaning, inspection and repair.
(1) Removal. Position bucket on its side and
(a) Replace damaged or defective parts
remove four cotterpins, nuts, and lockwashers, from -
cleaning solvent and dry thoroughly.
recess in teeth, then remove four wedge screws and
(b) Visually inspect mounting hardware
teeth from bucket.
for stripped threads or other defects; inspect teeth for
(2) Cleaning, inspection, and repair.
bent, cracked, or excessively worn condition.
(a) Clean all parts in an approved
(c) Replace damaged or defective
cleaning solvent and dry thoroughly.
parts.
(b) Visually inspect teeth for excessive
(3) Installation of teeth. Install teeth on
wear, and mounting hardware for stripped threads or
other defect.
(c) Replace all defective parts.
4-15
