CONTROLS AND OPERATION
SECTION II
NOTE
12. After the completion of either procedure, place the di-
verting valve switch in the "upper" position end store the
The bolt capscrew holds the axle locking bolt to the
hoses under the platform on the left side of the machine.
keeper plate. The keeper plate capscrew holds the
keeper plate to the cerbody. Keep in mind to always
remove the inboard capscrews which are the cap-
screws that hold the keeper plate to the carbody.
LIFTCRANE OPERATING CYCLE
The liftcrane operating cycle consists of five steps: setting
the boom angle (boom hoist operation), lifting the load
(hoisting operation), swinging the load, spotting the load,
end lowering the load (see Figure 2-10).
The functions of the drums during liftcrane operation are
tabulated below. The numbers in the column "controls"
correspond to the items in Figure 2-1.
STOPPING THE ENGINE
To stop the engine, proceed as follows:
1. Make certain that the drum end swing controls are in the
neutral position, and the swing and propel brakes are ap-
plied. Engage the drum pawls and set the drum brakes.
2. If possible, allow the engine to run at half speed or less
for several minutes before stopping the engine. This will
Figure 2-9. Axle Locking Bolts and Keepers
allow the engine to cool down.
3. Place the ignition switch in the OFF position to stop the
engine.
6. Extend the hydraulic cylinders to the end of their stroke
MACHINE TOWING
by moving the control levers simultaneously. The right hand
If, because of power loss, it should become necessary to tow
lever controls the cylinder by the operator's side. The left
this machine,the propel motors and brakes must be re-
hand lever controls the cylinder on the opposite side of the
moved from the propel gear cases. See Section IX of the
machine. It may be necessary to operate the control levers
Shop Manual.
separately in case the axles tend to bind.
7. Install the axle locking pins to secure the axles in the ex-
tended position. Fasten the keeper plate in place with the
capscrews provided.
Removal of the propel motors and brakes
Ieaves the machine in a free-wheel condition
8. Unpin the hydraulic cylinder at the crawler side frame
end retract the cylinder. Swing the cylinder 180 degrees
with no on-board means for braking. External
and pin it to the opposite crawler side frame bracket.
braking must be provided.
9. Move the diverter valve switch to the "upper" position.
Disconnect the hoses from the hydraulic cylinders end
HAND SIGNALS
temporarily store them under the upper platform.
It is frequently necessary during crane operation for the op-
10. Have all personnel stand clear of the machine end
erator to depend on a signalman for instructions. When
moving the machine into a position where there is very
swing the upper 180 degrees. Repeat steps 2 through 8 for
limited clearance, or when handling loads that are out of
the other crawler.
sight of the operator, the use of a signalman is essential.
The hand signals illustrated in figure 2-11 are those gen-
11. The procedure for retracting the crawlers is the same
erally accepted throughout the industry. Both the operator
as that given for extending; only now, the valves are oper-
end the signalman should be thoroughly familiar with the
ated simultaneously to retract the crawler side frames.
2-11
