Navistar ProStar+, Operation And Maintenance Manual

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Maintenance Instructions
be rebuilt. Purge valves may also stick if the air dryer heater has
failed and ice is clogging the valve.
Heater
Check that the air dryer heater activates at temperatures below
freezing. With the vehicle in a cold environment and before the
engine is started, turn on the ignition and touch the air dryer
housing. It should be warmer than other metallic items on the
vehicle. If some warmth cannot be felt, it may indicate that the
heater element or the wiring powering it should be serviced.
Air Reservoir / Tanks Moisture Draining
Moisture taken in with the air through the compressor inlet valves
collects in the air tanks. The wet tank is the first tank to receive
air from the air dryer and therefore collects most of the remaining
moisture that was not removed by the air dryer. Drain the wet
tank reservoir every day at the end of the trip. Drain the primary
and secondary tanks periodically. Periodically, manually drain
each reservoir by opening the drain cock located either on the
bottom of the tank or in the end of the tank.
Make sure the drain passage is not plugged. For ease of
draining, some or all air tank drain valves may be equipped with
optional pull cords. There must be some air pressure in the
system to ensure proper drainage. Close the drain cocks after
all moisture has been expelled.
Drain the wet tank daily at the end of each trip to purge collected
water and prevent ice formation inside the tank when the vehicle
is shut off in cold weather. If you are unsure which tank is the
wet tank, drain all tanks daily.
On vehicles equipped with automatic drain valve(s), moisture
and contaminants are automatically removed from the reservoir
to which it is connected. It operates automatically during each
compression cycle and requires no manual assistance or control
lines from other sources.
The Bendix
®
AD-IS
®
air dryer has an integral wet / purge tank that
automatically purges itself and the desiccant of collected water
at the end of each compressor cycle.
ABS Connections and Sensors
Periodically, push together the ABS wiring connections to ensure
they are fully seated. Press the wheel speed sensors into their
mounting collars to ensure they are fully seated.
Cab
Care of Vehicle
Washing and Waxing
Frequent and regular washing will lengthen the life of your new
vehicle's painted finish and bright metal trim.
Wash your vehicle often with warm or cold water to remove dirt
and preserve the original luster of the paint. Never wash the
vehicle in the direct rays of the hot sun or when the sheet metal
is hot to the touch, as this may cause streaks on the finish. Do
not use hot water or strong soaps or detergents, as this may etch
the paint or exposed metal / bright surfaces. Do not wipe off dirt
when the surface is dry, as this will scratch the paint or exposed
metal / bright surfaces.
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