Monaco 2008 Knight, Owner'S Manual

Page: 197 / 246

2 0 0 8 K n I G h t
chassIs InformatIon — 10
193
The regeneration valve opens sending a small
charge of dry system air from the front air tank
back through the dryer. The backflow dries the
desiccant, preparing it for the next cycle.
Air Dryer Components:
1. Purge Valve:
A valve located on the
bottom of the air dryer base that remains
open during a compressor unload cycle
to allow collected moisture, condensation
and contamination to expel from the air
dryer during the purge cycle.
2. Pressure Relief Valve:
Protects the air
dryer from over-pressurization.
3. Regeneration Valve: Controls
regeneration of the desiccant by allowing
air from the supply and secondary tanks
to bypass the outlet check valve.
4. Heater Power Connection:
Provides 12
Volt DC power to the heating element.
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 15 amp fuse for the heater is located in the
rear distribution box found in the rear curbside
compartment.
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.
070164b
070165
1. O-Ring
2. Seal Seat
3. Cartridge Seal
080223