pawl control handle out to disengage pawl, then move
(3) Move swing and propel shifter lever (fig.
hoist clutch lever back to neutral.
(6) Lower boom by moving boom hoist clutch lever
on quadrant to engage swing gear.
away from operator. Boom will fall by gravity. Operator
(4) Release swing brake by turning swing
will control rate of boom descent by moving clutch lever
brake hydraulic control handle (fig. 2-23) one quarter
back toward neutral. Leave clutch lever in neutral when
turn counterclockwise, then pulling handle up.
boom is in desired position.
(5) To swing right, pull swing and propel clutch
lever (fig. 2-23) toward operator. To swing left, push
Caution: When
lowering
boom
to
a
lever away from operator.
horizontal position, never lower it below plane of
Note.
When using a long boom, or when
craneshovel. When the ground level in front of
load is suspended from a long cable, operate
craneshovel is lower than crawler tread, build up
engine at lowest practical throttle setting to prevent
cribbing under boom point to keep it horizontal.
load from swinging wide of boom point when
Booms have collapsed under lifting stress applied
stopping.
at this critical angle.
(6) To stop swinging, in either direction, return
d. Traveling. For traveling the crane-shovel more
swing and propel clutch lever to neutral.
than 100 feet, revolving frame must be positioned with
To stop load from passing desired point, apply swing
boom foot over crawler so that idler sprockets lead in
and propel clutch lever in the opposite direction.
forward travel. Swing revolving frame (b above) into
Note.
If accurate stopping of load is
proper position when necessary, then travel as follows:
necessary, or if revolving frame has a tendency to
(1) Remove wedge from in front of swing lock
lever (fig. 2-24), grasp trigger-lever and squeeze
drift, apply swing brake lever (fig. 2-23) and lock
together while moving swing lock lever forward. (It may
with swing brake hydraulic control handle. This will
require swinging the revolving frame a little left or right
hold revolving frame in a fixed position while the
before lock will engage ring gear.)
load is lowered.
(2) Move the swing and propel shifter lever
(7) Lower load by releasing hoist brake pedal.
The rate of load descent can be regulated by varying
(3) To travel forward, push the swing and
pressure applied to hoist brake pedal.
propel clutch lever (fig. 2-23) away from operator. For
When load is at rest, release pressure on hoist
information on how to steer, refer to e below.
brake pedal.
(4) When travel in completed, move swing,
(8) Repeat steps (1) through (7) as necessary.
and propel shifter lever (fig. 2-23) back to engage rear
c. Boom Raising or Lowering. With boom in a
notch on quadrant.
horizontal position, assure that boom hoist cable is
(5) If further operation is to be performed,
properly reeved, then proceed to raise as follows:
grasp trigger-lever and squeeze together while moving
(1) To raise boom, pull back on boom hoist
swing lock lever backward, then install swing lock lever
clutch lever (fig. 2-23) to engage boom hoist clutch.
wedge in front of lever.
(Squeeze the boom hoist hydraulic control handle
e. Steering.
against boom hoist clutch lever, and pump lever for a
(1) Engage steering wheel with steering gear
second short stroke to engage the clutch more firmly on
by turning steering gear engaging lever (fig. 2-24) to the
boom hoist drum).
down position.
(2) Pull boom hoist pawl control handle out to
(2) There are four different positions (or
remove pawl from engagement with gear on boom hoist
combinations) of the propel clutches and brakes
drum.
possible by turning steering wheel as follows:
(3) Pull boom hoist clutch lever toward
(a) Position number one. Turn steering
operator and raise boom. As boom approaches proper
wheel counterclockwise as far as it will go. This will
position, slow down by moving clutch lever toward
mechanically set both propel brakes and disengage both
neutral, and as boom angle indicator (para 2-8) shows
of the jaw clutches. This position is used when digging,
proper angle, move clutch to neutral, stopping the
or when machine is parked for a prolonged period.
boom.
(b) Position number two. Starting with
(4) To lock and maintain booms stationary
wheel in position number one, turn wheel about one and
position, push boom hoist pawl control handle down and
one half turns clockwise. This will set the left hand
engage pawl in teeth of gear on boom hoist drum.
brake
(5) In preparation for lowering boom, pull
boom hoist clutch lever back toward operator just
enough to take drum pressure off pawl; pull boom hoist
2-32
