TRUCK SERVICE MANUAL
BRAKES-AIR
REMOVING AND REBUILDING DESICCANT
SEALING PLATE
Before the desiccant cartridge can be replaced
or rebuilt the desiccant sealing plate must be removed.
It is recommended that all non-metallic parts be replaced
when the plate is removed. In the past, three methods
have been employed to secure the desiccant sealing
plate to the desiccant cartridge; a Tru Arc retaining ring,
two special thin nuts and the latest method a single hex
lock nut. Removing the securing device will permit the
desiccant plate to be separated from the desiccant
cartridge. After removing the desiccant cartridge:
1. Remove the two o-rings from the desiccant plate and
discard them.
2. Remove the ball check valve retaining clip and
remove and discard the rubber ball valve.
3. Clean the desiccant plate thoroughly using a quality
commercial solvent making sure the purge orifice
and check valve seat are clean.
Fig. 8. Installing O-Rings
4. Install new ball check valve and replace the retaining
ing instructions), the cartridge removed from the air dryer
clip and screw (Fig. 7)
may be discarded after the desiccant sealing plate is
removed.
The current revision replacement desiccant
cartridge is shown in Fig. 9. All prior revisions of the
cartridge with interchange with no modifications to either
air dryer.
Fig. 7 Installing Check Valve
5. Thoroughly lubricate the two new orings and install
them in their respective grooves in the purge plate
(Fig. 8).
6. Set the desiccant sealing plate
aside
for
reinstallation on the desiccant cartridge.
REPLACING DESICCANT CARTRIDGE
If the desiccant cartridge is to be replaced as an
assembly rather than rebuilt (see desiccant cartridge
rebuild-
Fig. 9 Replacement Desiccant Cartridge
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