2 Component Removal and Installation
19
Meritor WABCO Maintenance Manual 34 (Revised 03-16)
Figure 2.11
2. Remove the four mounting bolts and the valve housing
assembly. When you remove the housing, the spring and cap
will fall out.
3. Remove the rubber diaphragm.
4. Clean and inspect the diaphragm lip groove. If the groove is
damaged so that a tight seal cannot be maintained, replace the
air dryer.
5. Install the new diaphragm with its lip in the groove. DO NOT
GREASE THE DIAPHRAGM.
6. Install the new spring and cap with the cap lip facing out. Install
the valve housing assembly with the new lubricated O-ring and
filter over the orifice. Install the new mounting bolts and tighten
to 53 in-lb (6 N폷m). Figure 2.12.
@
Figure 2.12
Purge Valve Assembly
1. Review Figure 2.13 to ensure you have all of the parts required
to replace the purge valve.
Use the grease included with the replacement kit to lubricate
O-rings and seals. Do not grease the rubber seat.
If shims are included in the replacement kit, they must be
installed above and below the spring. If they are not included,
they are not needed.
Figure 2.13
2. Remove the snap ring, valve head and spring.
3. Remove the piston assembly from the base. Figure 2.14.
Figure 2.11
INCLUDED IN KIT
DIAPHRAGM
DIAPHRAGM
CAP
SPRING
VALVE
HOUSING
VALVE
HOUSING
CAP
SPRING
The smooth diaphragm is
used with the smooth,
cylindrical regeneration
valve housing.
INCLUDED IN KIT
The speckled/dotted
diaphragm is used
with the finned/
ribbed die cast
housing.
Only one diaphragm is used per assembly.
DO NOT GREASE THE DIAPHRAGM.
4003879a
Figure 2.12
Figure 2.13
1002172a
DIAPHRAGM
SPRING
VALVE
HOUSING
ASSEMBLY
CAP
1002173b
METAL SHIMS
(IF REQUIRED)
O-RING
WASHER
O-RING
PISTON
SPRING
O-RING
VALVE
HEAD
WASHER
GREASE
SNAP RING
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