Section 10 --- Chassis Information
The Executive 2005
426
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 or stepwell covers,
receive air through pressure protection valves (PPV). The PPV will not allow compressed air flow 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, located in the engine compartment, regu-
lates the air compressor to cut-in and cut-out, keeping the air
system in the specified operating range of 105 to 120 psi, and
sending an air "purge" signal to the Air Dryer.
Cut-in pressure of approximately 105 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 identified by the
short release of air at the rear of the motorhome.
Air Storage Tanks
The front and rear air tanks should be manually drained once a month, or more, depending on oper-
ating conditions where humidity is high. The front air tank has a drain valve for both the wet and dry
side. The rear air tank only has one drain valve. Open the drain valves until all air is purged from the
tanks, allowing five extra minutes for moisture to expel. Remember to close the tank drain valves.
Both air tanks have a pressure relief valve which are set to release at approximately 150 psi.
090319
090435
Located Generator Compartment on curbside.
Drain
Air governor mounted to
engine on curbside
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