CONTROLS AND OPERATION
engine speed in revolutions per minute (RPM) end the total
number of hours the engine has been run.
5. L.H. DIRECTIONAL SIGNAL INDICATOR
6. HEATER CONTROLS. This switch controls the heater
fan. Turn the switch clockwise to energize the heater fan;
control the speed of the fan by turning the switch clock-
wise or counterclockwise as desired.
Figure 2-3 illustrates the heater shutoff valve. Turn the
valve clockwise to stop the flow of water through the heat-
er, when heat is not required. Turn the valve counterclock-
wise when heat is desired.
7. ENGINE STOP BUTTON. Depress this button to stop
the engine. After the engine has stopped, place the ignition
key in the OFF position.
8. DEFOGGER FAN SWITCH. Turn the switch clockwise
to energize the defogger fan; control the speed of the fan
by turning the switch clockwise or counterclockwise es
Figure 2-3. Heater Shutoff Valve
9. DIRECTIONAL SIGNAL LEVER. This lever actuates
15. DIFFERENTIAL LOCKOUT CONTROL. This lever
the directional signal lamps at the front end rear of the
locks and unlocks the interaxle differential. Race the lever
carrier. Pull the lever toward the operator to actuate the
in the LOCK position when approaching or anticipating icy
left directional signal; push the lever away from the opera-
or poor tractive conditions. This will provide maximum
tor to actuate the right directional signal.
axle traction. The interaxle differential can be shifted to
the locked position at any vehicle speed, except if the
10. HAZARD WARNING INDICATOR. This lamp, when
wheels have already lost traction and are spinning.
illuminated, indicates that all the directional lights are ener-
gized for use as hazard warning lights.
11. HORN BUTTON. Depress this button to sound the car-
Do not wait until you have lost traction and your
wheels are spinning to lock the interaxle differential.
This could result in damage to the axles.
12. STEERING WHEEL.
Place the lever in the UNLOCK position after passing ad-
verse conditions. This permits the interaxle differential to
compensate for differences in the tire size and give you
maximum speed and performance.
If the machine is equipped with a Power Steering/
Outrigger Selector Valve (item 25). be sure it is
pushed in and latched when operating the carrier.
Let up on the accelerator to provide an interruption
13. HAZARD WARNING LIGHT SWITCH. Push this
in torque to the drive train when locking or unlocking
switch away from the operator to energize all directional
the interaxle differential.
lights for use as hazard warning lights.
16. EMERGENCY RELEASE VALVE. The emergency re-
14. WINDSHIELD WIPER SWITCH. Turn this switch
lease valve provides a means of transferring the isolated
clockwise to energize the windshield wiper; control the
emergency air tank to the Maxibrake control valve (item
speed of the wiper by turning the switch clockwise or
17) when pressure in the service tanks is lost.
counterclockwise as desired.