chassIs InformatIon — 10
192
2 0 0 8 K n I G h t
RPM.
Test confirms that the park brake is engaged
and holding.
Air Governor Cut-in Test:
The air governor controls action of the air
system pump. This will confirm the air governor
cut-in pressure setting.
1. Start engine.
2. Run engine until a chuff (air release) is
heard from the air dryer.
3. Fan (apply/release in quick succession)
service brake pedal until system
pressure is between 110 and 115 psi.
Air governor cut-in pressure is approximately
115 psi.
Brake Grab Test:
This test will verify brake friction torque between
the front wheels. This test requires a rapid and full
pressure application of service brake pedal. Use
proper precautions to prevent movement of cargo
or other items that are not secured. This is a single
vehicle test. Select deserted and level road surface
(preferably a large and empty parking lot). Road
crown, depending on severity, may affect test
results.
1. Start engine.
2. Run engine until a chuff (air release) is
heard from the air dryer.
3. Release park brake.
4. Accelerate to approximately 5 mph.
5. Rapidly and firmly apply service
brake pedal to bring vehicle to an
abrupt stop.
The steering wheel will not pull to the
left or right if front wheel braking torque is
symmetrical.
Air Coupler
Provided for convenience is a remote
air supply coupler located in the generator
compartment. This female fitting will accept
type C automotive connectors. This auxiliary
air fitting may be used to inflate tires, air
mattresses or other pneumatic items. This fitting
is not designed to charge the air system on the
motorhome. The air supply for the auxiliary air
fitting is charged from the front air tank through
a pressure protection valve.
To use this feature:
Slide the locking collar back. Using a
firm grip, fully insert the air fitting into
the auxiliary air supply. Release the
locking collar to retain the air fitting after
the fitting is properly inserted.
To remove fitting:
Firmly grip the air hose near the fitting to
prevent recoil.
Slide the locking collar back to release
fitting.
NOTE
Due to air pressure restrictions in the
pressure protection valve and tire stem
valve, the maximum amount of tire
pressure achieved when the system is
used to fill a tire is approximately 115 psi
with the air system on the motorhome
charged to 130 psi. Maximum outlet air
pressure is achieved when the air system
completes the fill cycle indicated by the
purge cycle of the air dryer. Use a short
hose to reduce tire fill time.
aIr Dryer
The air dryer, located between the frame rails
next to the transmission, removes moisture from
the compressed air system to prevent freezing
of brakes or other pneumatically operated
items. The three functions of the air dryer are
cooling, filtering and drying the system air. This
prevents valve and seal damage or wash away of
lubricants as well as freeze damage to the system
components.
Air Dryer Cycle:
The governor turns the compressor on when
the supply tank pressure drops below cut-in
pressure. Compressed air then passes into the
air dryer at the inlet port. Moisture-laden air
and contaminants pass through the desiccant.
Moisture is retained by the desiccant and collects
in the base of the dryer. When the compressor
reaches cut-out pressure (approximately 130
psi) the purge valve opens and the dryer purges
and expels water collected in the dryer base.
090435b
Located in generator compartment
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