1
®
SD-08-2415
Bendix
®
AD-SP
™
System Purge Air Dryer & SC-PR
™
Single Check Protection Valve
“SPIN OFF”
DESICCANT
CARTRIDGE
EXHAUST PORT
MOUNTING
HOLES (3)
AD-SP
™
air dryer aluminum body contains the following
serviceable components or assemblies; the turbocharger
cut-off valve, heater and thermostat assembly, delivery check
valve assembly and combined purge and relief valve
assembly. In addition, the non-serviceable purge control
valve is located in the body. All service and replacement
can be accomplished from the exterior of the dryer without
removal from the vehicle. The spin-on desiccant cartridge
is removed and installed using a “strap wrench.”
The AD-SP
™
air dryer has three female pipe thread air
connections identified as follows:
Air Connection Port ID Function/Connection
CON 4 ...................... Control Port (purge valve control
& turbo cut-off).
SUP 11 .................... Supply Port (air in).
DEL 2 ...................... Delivery Port (air out).
DESCRIPTION
The function of the AD-SP
™
System Purge 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 system purge designation is used because the
AD-SP
™
air dryer uses a small portion of system air pressure
from the supply and front axle service reservoirs to perform
the purge or regenerative function. An SC-PR
™
single check
protection valve or a valve that performs the same function
is always used in conjunction with the AD-SP
™
air dryer to
protect the service system.
The AD-SP
™
air dryer consists of two major component
groups, a spin off desiccant cartridge assembly and a die
cast aluminum body assembly. The desiccant cartridge is
self contained and serviced as a complete assembly. The
FIGURE 1 - AD-SP
™
SYSTEM PURGE AIR DRYER
DELIVERY PORT
EXHAUST PORT
SUPPLY
PORT
MOUNTING
HOLES (3)
TURBO
CUTOFF VALVE
HEATER &
THERMOSTAT
CONNECTOR
CONTROL
PORT
