boom height. Swing boom toward work area (para 2-
pressure to digging brake and hoist brake pedals to hold
bucket in position.
12b) then apply swing brake to hold boom is desired
position.
j. Swing the revolving frame to desired dumping
position (para 2-12b), then release digging brake pedal
i. Release pressure on digging brake pedal and
to open bucket.
hoist brake pedal simultaneously. Apply pressure to
both brake pedals to prevent cables from overrunning as
k. Swing the open bucket back to loading point and
bucket reaches ground.
repeat steps b through 1 working cycle as often as
necessary.
k. Repeat steps c through S, i and j above as
necessary.
l. When though with work for the day, lower
bucket to ground and disengage engine clutch (fig. 2-
24).
l. When work for day is through, lower bucket to
ground, and disengage engine clutch (fig. 2-24).
maintenance checks and services (para 3 6).
maintenance checks and services (para 3-6).
2-30. Operation of Dragline Front End Attachment
a. Perform preventive maintenance checks and
2-31. Operation of Shovel Front End Attachment
services (para 3-6); start engine (para 2-10), and
a. Perform preventive maintenance checks and
engage engine clutch (fig. 2-24).
services (para 3-6); start engine (para 2-10), and
engage engine clutch (fig. 2-24).
to between 40 and 45 angle, the normal angle for
dragline operation.
1-7. When positioning crane-shovel near bank, keep
c. Release digging brake pedal, allow bucket to
about 11/4 to 11/2 times dipper length between crawlers
trip, then lower bucket to work area by releasing
and edge of bank.
pressure on hoist brake pedal. When bucket touches
ground apply hoist brake pedal to prevent cable
overrunning.
pressure on hoist brake pedal.
d. To crowd dipper into bank, extend dipper stick
d. To fill dragline bucket, pull crowd and retract
by pulling crowd and retract clutch lever toward
clutch lever toward operator, slipping hoist brake as
operator, then returning lever to neutral.
required to allow bucket to level out when filled.
e. To load dipper from bank, move hoist clutch
e. When bucket is loaded return crowd and retract
lever toward operator, then just a moment later, pull
clutch lever to neutral and apply slight pressure to
crowd and retract clutch lever toward operator.
digging brake pedal, then pull hoist and propel clutch
Note
lever toward operator. The slight pressure on digging
The dipper should slice a thin layer
brake keeps bucket level and prevents it from dumping
from bank rather than digging in.
its load.
f. When bucket is high enough to clear
f. When dipper is loaded, move crowd and retract
obstructions, swing to dumping area (para 2-12b), at the
clutch lever away from operator and retract dipper from
same time slipping digging brake to allow bucket to
bank.
swing out under boom point.
g. When bucket has reached the desired position
return hoist clutch to neutral and apply hoist brake
for dumping, release all pressure on digging brake
pedal, then swing dipper (para 2-12b) over unloading
pedal.
area. Apply swing brake (fig. 2-23) when dipper is in
unloading position, then move dipper trip lever to open
position and repeat above working cycle as often as
dipper door and dump load.
necessary.
Note
Working or digging area can be
then position crane-shovel for digging, and repeat above
enlarged beyond boom point by
work cycle as necessary.
"casting" bucket.
i. To cast bucket beyond boom point, pull crowd
and retract clutch lever toward operator and bring
bucket toward boom foot, as bucket is hoisted to half
2-36
