2 0 0 8 K n I G h t
chassIs InformatIon — 10
189
The pneumatically operated items are divided
into two categories: brakes and accessory air.
Brakes have full use of supplied air pressure.
Accessory air items, such as air horns, receive
air through pressure protection valves (PPV).
The PPV will not allow compressed air flow
until about 60 psi. In the event of an air system
problem, the pressure protection valve will
leave a reserve air charge for braking. Pressure
protection valves are installed for safety.
Air Governor
The air
governor, located
in the engine
compartment,
regulates the air
compressor to
cut-in and cut-out,
keeping the air system in the specified
operating range of 110 to 130 psi, then sends an
air “purge” signal to the
Air Dryer.
Cut-in pressure of
about 105 psi is factory
preset from the governor
manufacturer and is
not adjustable. Cut-out
pressure is calibrated to
130 psi. When cut-out
pressure is reached, the
governor will send an air
purge signal to the Air
Dryer. This opens the
purge port of the Air Dryer,
expelling moisture. The
purge action of the Air
Dryer is identified by the
short release of air at the
rear of the motorhome.
Air Storage Tanks
Manually drain the
front and rear air tanks
once a month, or more,
depending on operating
conditions where humidity
is high.
Air Drains:
Air system tank drains are located in the
generator compartment and in the rear engine
compartment. The air tanks should be drained at
least once a month or more often in areas of high
humidity and where temperature fluctuates 40º F
or more daily.
To Drain the Tanks:
• Slowly open the drain valves. Moisture
will be expelled under pressure. After
all moisture and air is purged from the
tanks, the valves should remain open
an additional five minutes to allow any
moisture remaining a chance to drain.
• Close valves and start engine. Check
valves for leaks.
090404b
090319
090435c
090435b
Located on engine
Rear tank drain: located
next to rear hitch
Front Tank Drain: located
in generator compartment
Representation of air supply system
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