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Driving Instructions
2007 HUV 4421 Gasoline and Diesel Vehicle Owner’s Manual Page 21
8.2. Diesel vehicles: To preheat glow plugs in cold weather, turn the key to the PREHEAT position and
hold it there for 10-15 seconds. Turn the key to the START position and hold it there until the engine
starts. If the engine does not start after 10-15 seconds, turn the key to the OFF position and repeat
the procedure. Once the engine starts, release the key and it will return to the ON position. The
engine will idle in neutral.
9. Release the park brake.
10. Keep the brake pedal engaged, and select direction of travel by placing the shift handle in the desired
position (Figure 4 or Figure 5, Page 11). The engine must be at idle before the shift handle is moved.
A buzzer will sound as a warning when the Forward/Reverse handle is in the REVERSE position.
11. Release the brake pedal completely, and then slowly press the accelerator pedal. As the accelerator
pedal is pressed, the vehicle will begin to move. Vehicle speed will increase as the accelerator is pressed
until full speed is reached. All-wheel drive will automatically drive the appropriate wheel(s) as required.
See following WARNING.
ý WARNING
• Operator must control vehicle speed when going downhill.
• Never shift the vehicle out of the FORWARD position while going downhill. If you do, you will
not be able to shift into the REVERSE position or back into the FORWARD position until
stopped.
• Press the brake pedal as necessary and press the accelerator pedal partially when
descending a hill. With the accelerator pedal partially pressed, the governor will cause the
engine to assist the brakes in controlling downhill speed.
ALL-WHEEL DRIVE (AWD) OPERATION
All HUV 4421 vehicles feature an all-wheel drive (AWD) system. The AWD system automatically directs
power to the wheel, or wheels, that have the most traction, providing optimum traction at all times. For exam-
ple, if all wheels except the rear passenger-side wheel lose traction, then power will be directed to the rear
passenger-side wheel. The all-wheel drive vehicle can adapt traction for a wide variety of driving surfaces and
conditions. See following WARNING.
ý WARNING
• When servicing the vehicle with part of the vehicle on jack stands, do not operate the engine
with the Forward/Reverse handle in either the FORWARD or REVERSE position. The all-wheel
drive system will engage any wheel(s), front or rear, with traction. See Figure 2 on page 9.
Under most circumstances the driver will not need to do anything to engage the AWD system; however, the
front differential may become locked (rotate at the same speed regardless of the terrain) under certain condi-
tions. If the front differential becomes locked, drive slowly in reverse for at least 10 feet (3 meters), then brake
gently. See following WARNING.
ý WARNING
• Reduced steering control can occur if the front differential becomes locked. To help prevent
this condition, avoid extremely hard braking in reverse.