Section 3
Installing Replacement Parts
MM-34
Page 22
Revised 11-02
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 3.17
.
7.
Install the new spring so it fits around the
“Y”-shaped fins on the valve body.
8.
Install the new cover and the new snap ring to
hold the components in place.
Pressure Relief Valve
NOTE:
If you plan to replace the Street-Tee fitting,
refer to TP-9557, Pressure Relief Valve Installation,
for instructions. This publication is available from
Meritor WABCO, 800-535-5560.
1.
Remove the old valve from the dryer.
If your dryer uses a bypass valve (date code of
2295 or earlier), the pressure relief valve will
be installed with a Street-Tee fitting at the
front (Port 1) of the dryer. On dryers with date
codes later than 2295, the pressure relief valve
is located at the side of the dryer (Port 31).
Figure 3.18
.
2.
Unscrew and remove the old pressure relief
valve.
Figure 3.18
.
WARNING
For Street-Tee installations, install the pressure
relief valve in the UP position, or within 30° of
vertical. Figure 3.19. If not installed in the correct
position, serious personal injury and damage can
result.
3.
Screw the replacement valve into the
Street-Tee fitting or the dryer base, depending
on the model air dryer you have.
Do not exceed torque of 30 lb-ft (40.8 N•m) for
3/8-inch thread, or 65 lb-ft (88.4 N•m) for
1/2-inch thread.
NOTE:
The threads on the replacement
pressure relief valve provided by Meritor
WABCO are coated with sealant. They do not
require any additional sealant.
Figure 3.17
1002180a
SNAP
RING
VALVE
BODY
SPRING
COVER
Figure 3.18
Figure 3.19
1002181b
PORT 1
PRESSURE
RELIEF VALVE IN
STREET-TEE FITTING
PORT 31
PRESSURE
RELIEF VALVE
T
1002182a
PORT 1
±
30
°
