CHASSIS INFORMATION - 10
178
CAY M A N 2 0 0 7
In extreme cold, verify that the air dryer
heater is in good working order. The 100-watt
heater in the air dryer is controlled by ignition
power. The heater turns on below 45° F and off
when the air dryer temperature is above 86° F.
The circuit breaker for the heater is located in
the rear electric bay.
WARNING:
Remove all pressure from the air system
before disconnecting any component,
including the desiccant cartridge.
Pressurized air can cause serious
personal injury.
Desiccant Cartridge
Warm, humid air from the
compressor condenses into
either water or water vapor.
A desiccant-type air dryer
protects the air brake system
by drying moisture-laden
air before it passes through
the air reservoirs and into
the brake system. The
replacement kit contains one
cartridge and one O-ring.
To Replace the Cartridge:
1. Loosen and remove the old cartridge.
Use a strap wrench, if necessary.
2. Remove and discard the O-ring from
the dryer base.
3. Inspect and clean the seal seat. Repair
any minor damage.
NOTE:
If the seats are damaged so badly that a
tight seal cannot be maintained, replace
the air dryer.
4. Install a new O-ring.
5. Lubricate the O-Ring on the stem with
a thin layer of grease.
6. Lubricate the cartridge seal with a thin
layer of grease.
7. Thread the replacement cartridge onto
the base until the seal touches the base.
Tighten the cartridge ONE additional
turn. DO NOT OVERTIGHTEN.
NOTE:
If an excess amount of water is present
when performing the monthly air tank
drain service, the filter for the air dryer
may need to be changed.
Desiccant-Type Air Dryer
1. Warm, humid air from the compressor
condenses into either water or water
vapor before entering the air dryer.
2. A desiccant-type air dryer protects the
motorhome air brake system by drying
moisture-laden air before it passes
through the air reservoirs and into the
brake system.
3. Water collects in the base of the dryer
when warm air condenses the water
before it enters the dryer, or inside of
the dryer before the water reaches the
desiccant.
4. The desiccant material then removes
additional water vapor, further drying
the air.
5. During regeneration phase, the
regeneration valve and pressure-
controlled check valve remove water
from the desiccant bed with a back ow
of dried, expanded system air.
REPLACEMENT REQUIREMENTS
Components When to replace? Why?
Desiccant Cartridge
• Every two to three years.
• When compressor is
replaced.
• Water in supply tank.
• Preventive maintenance.
• Contaminated cartridge.
• Saturated or contaminated
cartridge, high duty cycle
(wrong application of air dryer).
1. O-Ring
2. Seal Seat
3. Cartridge Seal
080223
070165
Located between
frame rails in front
of drive axle.
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