Service Manual

Air Dryer
8-12 627333-A
Desiccant Cartridge
FIG. 8: Desiccant cartridge is a steel housing
containing filter elements needed to filter and dry
system air.
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WARNING: To prevent serious eye injury,
always wear safe eye protection when
you perform vehicle maintenance or
service. Remove all pressure from the air
system before you disconnect any
component, including the desiccant
cartridge. Pressurized air can cause
serious personal injury.
Replace cartridge by turning cartridge
counter-clockwise to unscrew from air dryer. Screw
new desiccant cartridge onto air dryer by turning
clockwise until tight.
Outlet Check Valve
FIG. 9: Outlet check valve is located in outlet port.
Outlet check valve prevents air from flowing back
through air dryer and escaping out purge valve during
compressor unload cycle.
To replace outlet check valve, remove snap ring,
washer, spring, valve body, and O-ring. Clean and
inspect the valve bore. If bore is damaged so that a
tight seal cannot be maintained, replace air dryer.
Install new O-ring on valve body. Use greased supplied
with kit to apply thin film to valve bore and O-ring. Install
new valve body with its long end in bore. Install new
spring with its small end around the Y-shaped fins on
the valve body. Install new washer and snap ring to
hold components in place.
Regeneration Valve
FIG. 10: Regeneration valve controls regeneration of
desiccant. Regeneration valve allows air from supply
and secondary tanks to bypass outlet check valve. Air
expands and backflushes moisture off of desiccant,
then out through dryer purge valve.
Regeneration valve assembly kit contains two different
diaphragms to service regeneration valve assembly for
System Saver 1000, 1200, or 1800 air dryers. Use
correct diaphragm for style of regeneration valve
housing.
IMPORTANT: Using incorrect part will result in
unsatisfactory purging of desiccant cartridge
and may result in excess water in air system.
IMPORTANT: Smooth diaphragm is used with smooth,
cylindrical regeneration valve housing. The
speckled/dotted diaphragm is used with
finned/ribbed die cast housing. Only one
diaphragm is used per assembly. DO NOT
GREASE THE DIAPHRAGM.
FIG. 8
M6215003
FIG. 9
M6215004
FIG. 10
M6215005