CONTROLS AND OPERATION
SECTION II
PREOPERATION INSPECTION
3. Move the propel controller in the desired direction of
travel. Propel direction as related to control lever movement
Before actually operating the machine each day, perform
is illustrated in Figure 2-8.
the "A" Maintenance Checks outlined in Section V.
4. When the machine has been moved to its new location
STARTING THE ENGINE
allow the propel control lever to return to neutral and place
To start the engine, proceed as follows (see Figure 2-1):
the propel brake switch in the "on" positlon.
1. Move the engine clutch switch (item 21) to the disen-
gaged position.
EXTENDING AND RETRACTING THE CRAWLERS
2 Check to be sure that the left and right drum brake
switches (items 25 and 26) are in the "on" position.
A bank of valves, located at the left front side of the upper,
controls the extension and retraction of the crawler tracks.
3. Make certain that the boom hoist swing, and left and
Flow to this valve bank is controlled by the combination
right drum levers are in the neutral position. The swing and
valve located at the hydraulic reservoir. This valve is con-
propel brakes must be applied.
trolled by a switch mounted adjacent to the valve bank in the
left front side of the upper as shown in Figure 2-6.
4. Turn the ignition switch to the "start" position until the
engine starts. If the engine does not start within 30
Connected to the valve banks are two hoses that are stored
seconds, turn the key to the "off" position and wait two min-
utes before attempting to start the engine again The starter
on the underside of the upper platform. These hoses have
will engage only when the starting sequence begins with
quick disconnect adapters that fasten to the hydraulic cyl-
the key in the "off" position.
inders. The adapters are reversed so the extension hose can
only be connected to the extension port. The same is true for
the retraction hose.
NOTE
To extend or retract the crawlers, proceed as follows:
The use of a cold weather starting aid may be re-
quired in extremely cold weather. Press the starting
1. Equip the rear of the machine with one counterweight
aid button (item 18). wait two seconds and engage the
(see Section IV). Equip the front of the machine in one of the
starter. Repeat the procedure for temperatures below
following ways.
OF.
A. The boom base section in the horizontal position.
5. Check all gauges, immediately after the engine starts, to
B. The basic boom (base plus tip) in the horizontal position
be sure they are reading properly. If the readings are
and blocked securely.
improper, stop the engine immediately and determine the
cause of the improper gauge reading before continuing op-
2. Locate the machine on firm, level ground and swing the
eration.
upper so the boom is over the crawler to be extended. Lower
6. Allow the engine to run at 800 to 1000 rpm for 4 or 5
the boom to the horizontal and block it securely.
minutes before working the machine.
3. Connect the hydraulic cylinders to the side frame
brackets of the crawler to be extended. Fasten with the pins
provided. Connect the hoses to the hydraulic cylinders.
PROPELLING THE MACHINE
Propel direction and steering are controlled by the propel
control lever (see Figure 2-8). Propel speed and torque are
affected by the engine rpm and by the proportional move-
ment of the propel control lever Propel tire machine as
D o not pla c e t h e hydra u l i c oil dive r t i n g va l v e
Do
follows.
s w i t c h in t h e "low e r " posit i o n unt i l t h e hose s
a r e a t t a c h e d t o t h e fit t i n g s on t h e hydra u l i c
cylinders.
D o not a t t e m p t t o prope l t h e m a c h i n e w i t h t h e
4. Position the diverting valve switch to "lower", thereby
e n g i n e spe e d unde r 1 0 0 0 rpm . Prope l l i n g a t e n -
diverting hydraulic fluid to the crawler extend/retract sys-
g i n e spe e d s be l o w 1 0 0 0 rpm c o u l d da m a g e t h e
tem.
p r o p e l pum p s due t o a la c k of oil pre s s u r e .
1. Increase the engine speed to the maximum governed
rpm's.
5. Remove the keeper plate capscrews with the axle lock-
ing bolts attached from the side to be extended that secure
2. Release the propel brakes by moving the propel lock
each axle to the carbody (see Figure 2-9).
switch to the "off" position.
