Technical Bulletin
Bulletin No: | Effective Date: 11/29/99 | Cancels: NA | Page: 1 OF 2 |
Subject: AIR DRYER CARTRIDGE DEFECT
It has been brought to our attention that there was a manufacturing defect in a small number of
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
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.
