TM5-3820-256-1 0
CONTROL or
KEY
INDICATOR
FUNCTION
14
Not used
Former light switch; refer to item 30.
15
Windshield wiper/washer
Controls operation of windshield wipers and
controls
washers. Left knob controls left-side wind-
shield; right knob controls right-side wind-
shield. Turn CW one position for slow; second
position for fast. Push for washer.
16
Trailer air supply control
Controls air supply to trailer connector at rear
of truck. Push knob in to supply air; pull out
to shut off air.
17
Park brake control
Pull to apply vehicle parking brake. Push in to
release.
18
Power divider lock-out
Locks out inter-axle differential for maximum
lever
pulling power in slippery or poor road condi-
tions. IN for additional traction; OUT for
normal driving.
WARNING
Engage power divider lock-out (18) at slow speeds or when stopped and never when wheels are spinning. Do not
operate the axles on dry pavement with lock-out engaged for prolonged duration.
19
Front axle lever
Select ENG to engage front axle drive; select
DIS to disengage front axle drive.
20
PTO lever
Controls engine power take-off. Move to ENG
to engage; to DIS to disengage PTO.
21
Transfer case lever
Select DIR (direct) for high speed; select UND
(underdrive) for low speed.
22
Engine air restriction
Indicates condition of engine air cleaner filter.
gage
Restriction limit is 25 in. of water vacuum.
23
Hourmeter
Indicates cumulative hours of engine operation.
24
PTO indicator
Illuminates when PTO is engaqed.
25
Front axle indicator
Illuminates when front axle drive is engaqed.
26
Heater control
Lever for turning on and controlling degree of
heat. Move from full left to ON; move fur-
ther to the right for more heat.
27
Air outlet control
Controls heater air flow between heat (CAB)
and defrost (DEF).
28
Heater fan control
Controls fan speed from LO to HI.
29
Vent control
Knob to control fresh air ventilation. CCW for
ventilation; CW to close vent.
30
Lighting control unit
Controls vehicle lighting for regular service and
blackout lighting operations.
31
Throttle control
Sets and holds engine throttle. To increase
engine rpm, depress center button and pull
out on control. To make fine throttle ad-
justments, turn knob CW to increase engine
speed; CCW to decrease speed.
32
Engine start
Pushbutton for cranking the engine starter.
33
Key switch
Energizes truck electrical system.
34
Air horn
Lanyard controls air horn. Pull to sound.
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