Navistar WorkStar Series, Руководство оператора

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Operation
CAUTION
Do not keep the front axle engaged when
operating on dry, hard surfaced roads. Operating
on hard, dry surfaces with both the front and
rear axle engaged creates a build-up of torque
between the axles resulting in excessive tire wear
and strain on the entire drive unit.
When operating with both the transmission and
transfer case in low gear, the front axle must be
engaged to prevent excessive torque loads on the
rear axle.
When front axle is engaged and the transmission
is in low gear, the transfer case must be in low
gear to provide wheel slip protection.
Transfer Case
The transfer case transmits power to the front driving axle for
operation over rough terrain, steep grades, or slippery surfaces
(i.e., mud, gravel, snow, etc.)
where improved traction is
required.
Operation
The transfer case is actuated by control switches on the center
control panel.
The ON/FRONT AXLE switch, containing an
in-switch indicator, is used to toggle the solenoid that causes the
air-actuated transfer case to engage or disengage the front axle
from the drive train. The XFER HI/XFER LOW switch controls
either of two solenoids that cause the air-actuated transfer case
to operate in either the high or low gear ratio.
In-Switch Indicator
The ON/FRONT AXLE switch contains an indicator that
will be lit steadily when switch is in the ON position and
the front axle has been safely engaged. When the driver
attempts to engage or disengage the front axle at speeds
faster than 10 mph with the ON/FRONT AXLE switch in
the ON position, the indicator will blink until the proper
speed is reached. When the driver attempts to engage
or disengage the front axle when the tires are slipping and the
ON/FRONT AXLE switch is in the ON position, the indicator will
blink until the tires regain proper traction.
Front Axle Engagement when Vehicle is in Motion
To engage the front axle, the following steps are required:
NOTE: Ensure that the wheels are not slipping while performing
these steps, and that there are no error conditions or indicators
displayed.
1. The vehicle must be operating on a level surface.
2. Slow the vehicle to a speed below 10 miles per hour.
3. Place the ON/FRONT AXLE switch in the ON position.
4. The front axle will be engaged and the indicator will be
lit.
Front Axle Disengagement when Vehicle is in Motion
To disengage the front axle, the following steps are required:
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