d. Position hoist drum brake band, digging drum
(2) Continue adjustment in manner described
brake band, and planetary clutch band in similar
manner, then proceed to adjust brake or clutch band
3-30.
Positioning Clutch and Brake Bands on
Hoist Drum
3-31.
Hoist Brake, Digging Brake, or Planetary
a. General. Hoist drum brake and clutch bands
Clutch Band Adjustment
are spring mounted to allow bands to move slightly
a. Position planetary clutch band (para 3-30).
during engagement or disengagement. Spring tension
b. Adjust hoist brake band (fig. 3-29) by loosening
keeps them in the desired position. With applicable
locknut and tightening adjusting bolt as far as it will go.
brake or clutch control lever in neutral, position band on
then back off on adjusting bolt until operation of brake
drum as described below.
lever engages with band drum smoothly under nominal
b. Installation Positioning. Install band on two
pressure. After brake band is properly adjusted, tighten
studs (fig. 3-27) on mounting bracket, and secure with
locknut.
two lockwashers and nuts.
c. Positioning Prior to Adjustment. Position band
Note. A few drops of light oil on trunnions
so that it does not drag on drum by backing off the
upper and lower locknuts on both studs (fig. 3-27), then
will smooth out operation at band and lever.
tightening or loosening the lower or upper adjusting nuts
until there is clearance all around the drum. After band
Note. See different linkage arrangement for
is positioned correctly, tighten the four locknuts on the
planetary clutch band in paragraph 3-130, for shovel
two studs.
or crane operation.
planetary clutch band linkage arrangement between
shovel and crane operation.
Figure 3-29. Hoist brake, digging brake, and planetary clutch band adjustment.
3-37
