226 • Section 10 — Chassis Information
Cayman 2006
AIR SUPPLY SYSTEM
The air compressing system on the motorhome includes a compressor, governor, dryer, front tank and rear
tank. The compressed air system operates several items, including brakes, suspension, optional air horns and
air gauge. The air system is charged by a gear driven air compressor mounted on the engine. As engine speed
increases, compressed air output increases. When the air is compressed, heat is generated. Heat dissipates as
the air is discharged from the compressor. Moisture condenses in the compressed air as it cools and enters the
air dryer to be fi ltered. The fi ltered air charges the front air tank, which is divided into a wet and dry side. The
compressed air enters the wet side before entering the dry side. A discharge line from the dry side of the front air
tank charges the rear air tank. Discharge lines use inline check valves to prevent a back fl ow of compressed air.
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 optional air horns, receive air through pressure
protection valves (PPV). The PPV will not allow compressed air fl ow until approximately 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 regulates the air compressor to cut-in and cut-out,
keeping the air system in the approximate operating range of 90 to 120 psi,
and sending an air purge signal to the air dryer.
Cut-in pressure of approximately 90 psi is factory preset from the
governor manufacturer and is not adjustable. Cut-out pressure is calibrated
to 120 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 identifi ed by the
short release of air at the rear of the motorhome.
090319
Air Governor: Mounted
to engine on curbside.
090404f
Typical Layout
Содержание Cayman 2006
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Страница 64: ...56 Section 2 Driving Safety Cayman 2006 Weighing Procedure Worksheet 020255BA Example Worksheet ...
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Страница 66: ...58 Section 2 Driving Safety Cayman 2006 Weight Record Sheet ...
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