Figure 3-106. Front hook rollers, removal and installation.
(1) Lower boom until point is slightly below
(2) Remove two capscrews, lockwashers, and
the horizontal with weight of boom resting on cribbing
keeper plate from bracket (fig. 3-106).
similar to that shown in figure 2-6.
(3) Drive hook roller shaft backward slightly
(2) Support the swivel arm (fig. 3-107) with
to make lockring accessible, remove lockring, then pull
cribbing or a jack, remove two capscrews, lockwashers,
hook roller shaft forward out of mounting bracket and
and keeper plate, use wedges on cribbing, or the jack to
remove hook roller.
take arm weight off eccentric pin, then remove eccentric
(4) Remove remaining hook roller in a similar
pin.
manner.
(3) Remove four capscrews, lockwashers,
(5) Install in reverse order.
b. Cleaning, Inspection, and Repair.
and two keeper plates, push roller pins inward slightly to
make retainer accessible, remove retainer, then pull
(1) Clean all parts in an approved cleaning
roller pins outward and remove rollers and pins.
solvent and dry thoroughly.
Remove lubrication fittings and bushings from the two
(2) Visually inspect mounting hardware for
roller pins.
burs or stripped threads, inspect eccentric shaft (pins) or
(4) Remove remaining rear hook roller in a
rollers for signs of excessive wear, grooves, chips, or
similar manner.
cracks.
(5) Install in reverse order.
(3) Repair by replacing damaged, defective,
a. Cleaning, Inspection, and Repair.
or worn parts.
c. Adjustment. Adjust hook rollers as directed in
(1) Clean all parts in an approved cleaning
solvent and dry thoroughly.
(2) Visually inspect pins for grooves, cracks,
3-126. Rear Hook Rollers
chips or other damage. Inspect mounting hardware for
a. Removal and Installation.
burs or stripped threads.
3-118
