TM 5-3810-288-12
of corrosion. Refer to paragraph 2-8 for information
3-65. Boom Hoist Shaft Brake and Clutch
concerning installation or removal of the piledriver
attachment.
a. Brake Band Removal. The boom hoist
brake band is removed as an assembly. Refer to figures
3-61.
Clutch and Broke
Band
Removal
and
In order to remove the brake band assembly, remove
Replacement
items 1 through 7 of figure 3-89. The entire assembly
can then be removed to the bench for complete
In every case where clutches or brake bands are to be
disassembly as shown. Unscrew the threaded end of
removed or replaced, safety requires that the load being
the lower brake band from the adjusting rod to complete
supported by that clutch or brake be lowered to the
removal of the brake bands. Note that the phantomed
ground. Specifically, always lower the boom to the
pin on figure 3-89 is welded to the revolving frame side
ground before working on the boom hoist brake or
frame and can not be removed.
clutch. Lower the loads to the ground before working on
front or rear drum brake or clutches. Secure the
b. Refer to figure 3-90 and remove or replace
revolving frame from turning before working on swing
the boom hoist shaft clutch. Always place the boom on
brake, swing brake lock, or anti-rotation device. Always
suitable supports before working on the clutch.
lower attachments, including shovel fronts, backhoe
fronts, clamshell and dragline buckets, booms and jibs,
3-66. Swing Brake
and piledriver or magnets to the ground or to proper
supports to prevent any possible injury to personnel or
Refer to figure 3-91 and remove or replace swing brake
damage
shoes. Engage the swing brake lock, figure 2-36, to
to the machine.
prevent the upper from turning.
3-62. Rear Drumshaft Brake and Clutch
3-67. Drive Chains
a. General. Always adjust a brake or clutch
a. General The removal and replacement
which has been removed before returning the machine to
procedures for each drive chain will be given below.
operation.
b. Reversing Shaft Chain. Refer to figure 3-92
b. Brake Band. Refer to figure 3-86 and
and remove the reversing shaft chain.
remove or replace the rear drum brake band.
c. Rear Drum Chain. Refer to figure 3-93 and
c. Clutch Band. Refer to figure 3-87 and
remove the rear drum chain case. Then refer to figure 3-
remove or replace the rear drumshaft clutch -and.
Position the clutch band as required by "tapping" the
d. Horizontal Swing Shaft Chain. Refer to
engine start pushbutton.
chains.
3-63. Front Drumshaft Brake and Clutch
e. Shovel Crowd Chain.
Removal and
replacement procedures for the shovel crowd chain are
The front Drumshaft brake bands and clutch bands are
covered in paragraph 3-57.
removed and replaced in the same manner as the rear
drumshaft brake and clutch bands. The only difference
3-68. Hook Rollers
is that the front drumshaft clutches and brakes are
a. Removal. Refer to figure 3-96 and remove
assembled reversed, since the drumshafts turn in
opposite directions. Refer to figures 3-86 and 3-87 and
hook rollers. There is a single hook roller at the front of
remove front drumshaft brake and clutch bands.
the revolving frame as shown in figure 3-96. A double
hook roller of identical design is used at the rear of the
revolving frame. Removal and replacement are the
3-64.
Revering Shaft and Horizontal Swing Shaft
same.
Clutch
b. Adjustment. Refer to figure 3-97 and adjust
The reversing shaft clutch and the two horizontal swing
hook rollers if clearance between rollers and roller path
shaft clutches are all identical in appearance and in
exceeds 1/16 inch. Items shown in figure 3-96 are also
removal and replacement procedures. Refer to figure 3-
identified on figure 3-97 for clear understanding.
swing shaft clutch as shown.
3-101
