KEY TO CONTROL PANEL (Cont) - TM-9-2320-273-100063

TM 9-2320-273-10

KEY TO CONTROL PANEL {Continued)

WASHER CONTROL KNOB

Press the knob to spray cleaning solvent on the

windshield. Release the button to stop spray.

DIFFERENTIAL LOCK/UNLOCK CONTROL

Do not place switch in the LOCK position

while the truck is moving or any wheel is

spinning.

Controls inter-axle differential lockup on all

models and also engages the front driving axle

on the M916 thru M920.

M915 Only

In poor traction conditions (ice, snow, etc.),

stop the truck and place switch in the LOCK

position to lockup the drive line. When traction is

back to normal, place switch in the UN LOCK

position while the truck is moving. Use the UN-

LOCK position for all normal driving conditions.

M916 thru M920

In poor traction conditions (ice, snow, off road,

etc.), stop the truck and place switch in LOCK

position to lockup drive line and engage the front

driving axle. When conditions are back to normal,

let up on accelerator and move switch to the UN-

LOCK position momentarily, then place switch in

the center (OFF) position for normal driving.

NOTE

The differential lockout indicator light will

come on when the control is in the LOCK

position.

PARK BRAKE CONTROL

Never use the parking brake for normal braking

Pull out to apply parking brakes; push in to release

parking brakes.

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