TM 5-3810-307-10
Axle DIFFERENTIAL LOCK Switch (31). The switch is a three-position toggle switch
located on the lower left side of the front console panel. Placing the switch to the FRONT &
REAR LOCKED position activates two solenoid valves to route air pressure to lock the front
and rear differentials. With the differentials locked, the right and left wheels on each axle
rotate at the same rate. When used with the range selector in 4WD (low range) position,
torque is equally split to the front and rear axles, and drive all wheels at the same rate.
Placing the switch to the REAR LOCKED position activates a single solenoid valve to route
air pressure to lock the rear differential. Placing the switch to the UNLOCKED position
returns the axles to normal.
Engine OIL PRESSure Gauge (32). The gauge is located on the left center of the front
console panel. The gauge indicates engine oil pressure on a dual scale calibrated from 0 to
100 psi (0 to 690 kPa). Normal indication at idle is 35 psi (241 kPa), and at maximum
governed speed is 85 psi (586 kPa). It receives a signal from an oil pressure sending unit
on the engine.
FUEL Gauge (33). The gauge is located on the lower left side of the front console panel.
The gauge indicates the quantity of fuel in the tank and has a scale calibrated from 0 to 4/4.
The gauge receives a signal from a sending unit in the fuel tank.
DRIVE AXLE Selector Switch (34). The switch is located on the lower left side of the front
console panel. The switch is a two-position switch; 2WD (high range) and 4WD (low
range). The switch controls a solenoid-operated valve that operates the high/low speed
range and axle disconnect cylinders on the transmission.
Windshield WIPER/WASHER Switch (35). The switch is located on the lower left side of
the front console panel. The switch has four positions; Off, Intermittent, Low, and High.
Depress the switch to energize windshield washer pump assembly. Placing switch to
Intermittent energizes the wiper motor to operate at an intermittent interval (the farther the
switch is moved clockwise in the Intermittent position range, the faster the interval). Low
energizes the wiper motor in low speed, while HIGH energizes the motor for high speed.
The OFF position stops the motor which automatically parks the wiper blade.
ENGINE WATER TEMPerature Indicator (36). The indicator is located on the upper right
of the front console panel. The indicator will light when the engine water temperature
reaches 205 F (96 C) as detected by a switch mounted in the diesel engine block.
TRANSmission OIL TEMPerature Indicator (37). The indicator is located on the upper
right middle of the front console panel. The indicator lights when the transmission oil
temperature exceeds 250 F (121 C).
TRANSmission RPM/PRESSure Indicator (38). The indicator is located on the upper
right of the front console panel. The amber indicator lights when the transmission is in an
overspeed condition or when clutch pressure becomes critically low. The indicator will also
light when the ignition switch is in the ON position and the engine is not running because no
clutch pressure is generated.
TORQUE CONVERter UNLOCKED Indicator (39). The indicator is located on the upper
right side of the front console panel. The amber indicator lights when the torque converter
is in an unlocked condition.
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