BENDIX TCH-008-032 Dépliant

It has been brought to our attention that there was a manufacturing defect in a small number of AD-SP and AD-IS
air dryer cartridges.  The defective air dryer cartridges may allow desiccant beads to pass from the cartridge into
the purge valve assembly of the air dryer.  If the desiccant becomes trapped in the purge valve assembly, the
purge valve may be prevented from closing completely, causing the system to leak charge air to atmosphere.  This
leakage of air will then result in the inability to build system air pressure.

The table on page two identifies suspect piece numbers and their corresponding date codes.  The defect has been
corrected, therefore all components manufactured on or after November 13, 1999 (L1399H) are not suspect.

1.  If the system is unable to build air pressure, inspect the air dryer for leakage around the purge valve during

the charge cycle.  Wear appropriate eye protection and review all caution notes printed in the service manual
for the appropriate air dryer (SD-08-2415 for the AD-SP or SD-98-9808 for the DRM with AD-IS).

2.  Refer to instruction sheets provided in the maintenance kits where applicable.

a.  Use a strap wrench to remove the cartridge.  Position the strap wrench next to the lower lip of the

cartridge to prevent cartridge damage.  Turn the cartridge counterclockwise to remove.

b.  If desiccant beads are present in the purge valve area, the air dryer cartridge and purge valve assembly

must be replaced.  See page two for service replacement piece numbers.

c.  Remove the purge valve snap ring and purge valve assembly.

3.  Using shop air, remove all desiccant material from the air dryer body assembly.  Caution:  Wear proper eye

protection when using compressed air to blow the desiccant out of the air dryer body assembly.

4.  Wipe all of the body bores clean with a clean rag.
5.  Install the air dryer cartridge.

a.  Lubricate the cartridge sealing ring with lubricant provided.
b.  Screw the desiccant cartridge on to the body, by hand, clockwise until the seal makes contact with the

body. Turn one full turn.  If necessary, place a strap wrench on the desiccant cartridge next to the lower
lip of the cartridge.

6.  Install the purge valve assembly and test per the installation instruction sheet.