DESCRIPTION The function of the AD-9® air dryer is to collect and

DESCRIPTION The function of the AD-9® air dryer is to collect and
The function of the AD-9® air dryer is to collect
and remove air system contaminants in solid,
liquid and vapor form before they enter the
brake system. It provides clean, dry air to the
components of the brake system which
increases the life of the system and reduces
maintenance costs. Daily manual draining of the
reservoirs is eliminated.
The AD-9® air dryer consists of a desiccant
cartridge and a die cast aluminum end cover
secured to a cylindrical steel outer shell with
eight cap screws and nuts. The end cover
contains a check valve assembly, a safety valve,
three threaded air connections and the purge
valve housing assembly. The removable purge
valve housing assembly incorporates a purge
valve mechanism and a turbo charger cut-off
feature that is designed to prevent loss of engine
“turbo” boost pressure during the purge cycle of the
AD-9® air dryer. For ease of serviceability, the
desiccant cartridge and discharge check valve
assembly are screw in type. The purge valve
housing assembly, which includes the heater and
thermostat assembly, and the discharge check valve
assembly, is serviceable from the exterior of the air
dryer, while servicing the screw-in desiccant
cartridge requires removal of the air dryer assembly
from the vehicle.
The AD-9® air dryer has three female pipe thread
air connections and each is identified as follows:
Air Connection Port ID Function/Connection
CON 4 ...................... Control Port (purge valve
control& turbo cutoff).
SUP 11 ..................... Supply Port (air in).
DEL 2 ....................... Delivery Port (air out).
Important: Review the warranty policy before
procedures. An extended warranty may be
voided if intrusive maintenance is performed
during this period. Note: It is acceptable for the
purge valve to be maintained as necessary, i.e.,
the installation of a purge valve maintenance kit,
without voiding the warranty. Because no two
vehicles operate under identical conditions,
maintenance and maintenance intervals will
vary. Experience is a valuable guide in
determining the best maintenance interval for
any one particular operation.
The AD-9® air dryer alternates between two
operational modes or “cycles” during operation: the
charge cycle and the purge cycle. The following
description of operation is separated into these
“cycles” of operation.
Every 3500 operating hours, or 1 year:
replace the desiccant cartridge to increases the
life of the system and reduces maintenance
CHARGE CYCLE (refer to Figure 2)
When the compressor is loaded (compressing air)
compressed air, along with oil, oil vapor, water and
water vapor flows through the compressor discharge
line to the supply port of the air dryer end cover. As
air travels through the end cover assembly, its
direction of flow changes several times, reducing the
temperature, causing contaminants to condense
and drop to the bottom or sump of the air dryer end
After exiting the end cover, the air flows into the
desiccant cartridge. Once in the desiccant cartridge
air first flows through an oil separator which
removes water in liquid form as well as oil and solid
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