Spring tension keeps them ill the desired position. With
3-27. Hoist Brake, Digging Brake, or Planetary
applicable brake or clutch control lever in neutral,
Clutch Band Adjustment
position band on drum as described below.
a.
Position planetary clutch band (para 3-26).
b.
Installation Positioning. Install band on two
studs (fig. 3-19) on mounting bracket, and secure with
b.
Adjust planetary clutch band (fig. 3-21) by
two lockwashers and nuts.
loosening locknut and tightening adjusting bolt as far as
it will go, then back-off on adjusting bolt until operation
NOTE
of clutch lever engages clutch with band smoothly under
See paragraph 3-123 for difference in
nominal pressure.
After clutch band is properly
planetary
clutch
band
linkage
adjusted, tighten locknut.
arrangement between shovel and
NOTE
crane operation.
A few drops of light oil on trunnions
will smooth out operations at band
c.
Positioning Prior to Adjustment. Position
band so that it does not drag on drum by backing off the
and lever.
upper and lower locknuts on both studs (fig. 3-19), then
NOTE
tightening or loosening the lower or upper adjusting nuts
See different linkage arrangement for
until there is clearance all around the drum. After band
planetary clutch band in paragraph
is positioned correctly, tighten the four locknuts on the
two studs.
d.
Position hoist drum brake band, digging
c.
Adjust digging brake and hoist brake bands
drum brake band, and planetary clutch band in similar
in a similar manner.
manner, then proceed to adjust brake or clutch band
CAUTION
Do not adjust bands so tight that
operation of lever is hard. Tight
bands cause excessive wear on
linings and shorten their serviceable
life.
Figure 3-21. Hoist brake, digging brake, and planetary clutch band adjustment.
3-32
