2 Component Removal and Installation
21
Meritor WABCO Maintenance Manual 34 (Revised 03-16)
Figure 2.17
2. Disconnect the air line from the pressure-controlled check
valve and remove the valve from the tank and hex nipple pipe
fitting.
3. Install the new valve.
앫 Whatever orientation (up or down) the valve is in when it is
tight is acceptable, as long as the arrow is pointing toward
the tank.
4. Apply pipe sealant to the fittings and connect the air line to the
PC check valve.
5. Test the installation for proper operation. Refer to the
procedure in this section.
Bypass Valve
NOTE: The bypass valve is used on dryers with date codes of 0894
or earlier. Figure 2.18.
Figure 2.18
1. Review Figure 2.19 to ensure you have all of the parts required
to replace the bypass valve.
Use the grease included with the replacement kit to lubricate
O-rings and seals.
Figure 2.19
2. Remove the snap ring, cover, spring and valve body.
3. Clean and inspect the valve bore. If the bore is damaged so
that a tight seal cannot be maintained, then replace the air
dryer.
4. Install the new O-rings on the new valve body and cover.
5. Apply a thin layer of grease to the valve bore and the O-rings.
6. Install the new valve body with its long end in the bore.
Figure 2.20.
Figure 2.20
7. Install the new spring so it fits around the “Y”-shaped fins on
the valve body.
Figure 2.17
Figure 2.18
1002177b
PRESSURE-CONTROLLED
CHECK VALVE
TANK
HEX NIPPLE
PIPE FITTING
Arrow on
bottom of
valve must
face tank.
AIR LINE
Figure 2.19
Figure 2.20
1002179a
SNAP
RING
O-RING
VALVE
BODY
SPRING
O-RING
COVER
1002180a
SNAP
RING
VALVE
BODY
SPRING
COVER
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