minutes to allow the engine block and
(6) As carrier gains speed, release pressure on
manifold to cool.
accelerator pedal and press clutch pedal
down. At same time move gearshift level
(2) Stop the engine by turning the ignition
through neutral and into next higher gear
switch to the OFF position.
position, 2d.
(3) Make sure all controls are in the neutral
(7) Push down on accelerator pedal and
position.
release clutch pedal as before.
(4) Perform the necessary daily preventive
(8) Repeat these operations until transmission
maintenance services (para. 38).
is in its highest gear suitable for the
19. Carrier Operation
condition.
a. Driving Carrier.
c. Reverse Motion.
(1) Perform the necessary daily preventive
(1) Release pressure on accelerator pedal.
maintenance services (para. 38).
(2) Depress clutch pedal and hold down; at
(2) Place air line service shutoff valve located
same time apply pressure on brake pedal.
on front end of the carrier, in OPEN
(3) Stop carrier.
position.
Note.
(4) With clutch pedal depressed, move
gearshift lever through neutral to the right
The air line service and emergency
rear in reverse position.
shutoff valves are marked on both
front and rear of carrier.
(5) Release clutch pedal slowly; at the same
Caution:
time accelerate the engine in same manner
as when moving the carrier forward. Look
The air line service shutoff valve must
in intended direction of travel.
be in OPEN position to prevent build
up in the brake system resulting in
(6) Stop the motion of the carrier as instructed
setting of the brake system resulting
in (1) through (8) above.
in setting of the brakes.
(7) Disengage clutch pedal and put gearshift
(3) Place air line emergency shutoff valve,
lever in neutral position; apply the
located on front end of the carrier, in
handbrake.
CLOSED position.
Note.
Caution:
Quick application of the brakes may
The air line emergency shutoff valve
cause damage or Injury.
must be in CLOSED position to
20. Crane Operation
prevent emptying the entire air
a. General. The crane is used primarily for raising
system.
and lowering heavy loads. It is capable of operating
(4) The air line service and emergency shutoff
through a wide range of conditions. Refer to paragraph 4
valves, located on rear end of the carrier,
and tables 1 and 2.
must be In CLOSED position.
b. Positioning the Carrier. Back the carrier up to the
(5) Start the carrier engine (para. 17).
working site so that the major portion of the work will be
performed off the rear of the carrier. Dumping or
(6) Refer to figure 13 and operate the carrier as
unloading should be done off the sides. Set the carrier
instructed in b and c below.
airbrake lock after the working position is selected.
b. Forward Motion.
Caution:
(1) Depress clutch pedal.
When the crane is being operated, the
(2) Move transfer shift level into desired range;
main transmission gearshift lever on
refer to shifting diagram.
carrier should be moved to neutral
(3) Move the gearshift level into first speed
position and the handbrake set.
shown on shifting diagram.
c. Boom Raising and Lowering.
(4) Push handbrake down.
(1) Start the engine (para. 17).
(5) Release clutch pedal slowly; at same time
(2) Engage the engine clutch by pulling the
put pressure on accelerator pedal
engine clutch lever (fig. 14) back.
necessary for the engine to overcome the
load and put carrier in motion.
AGO 6819A
32
