6 Appendix III — Special Applications
40
Meritor WABCO Maintenance Manual 34 (Revised 03-16)
E. Remove the banjo fitting and metal washer.
F. Clean the valve surface area thoroughly before
replacement.
2. Install the replacement Econ valve assembly.
A. Install the metal washer on the restricted-flow nut.
B. Install the restricted-flow nut on the air dryer.
C. Position the metal washer and banjo fitting on the Econ
valve port.
D. Loosely fit the U-shaped tube into the banjo fitting and
restricted-flow nut. Make sure the tube is fully seated.
E. Install and hand-tighten the compression nuts on each
end of the U-shaped tube.
F. Lubricate and install the O-ring on the Econ valve.
G. Install the Econ valve into the banjo fitting.
H. Torque the Econ valve and all nuts to specifications
following the torque instructions in the kit.
Alcohol Evaporator
Check the vehicle’s air system for an alcohol evaporator.
NOTE: Typically, an alcohol evaporator will be installed in the line
between the air dryer and the supply (wet) tank. Common
installations are on the truck’s firewall, on a frame rail and behind
the cab. However, an alcohol evaporator can also be found at other
locations.
1. Check the vehicle’s air system to determine if an alcohol
evaporator is installed.
2. If an alcohol evaporator is installed in the air system, check for
a bypass line connected to the evaporator. Figure 6.6.
Figure 6.6
3. If a bypass line is connected to the evaporator, check to see if a
check valve is installed in the bypass line. If check valve is
installed:
앫 Remove the check valve from the bypass line,
앫 Remove the bypass line and
앫 Replace the bypass line with 1/4-inch (6.35 mm) nylon line.
Figure 6.6
1002188a
LINE FROM
AIR DRYER
ALCOHOL
EVAPORATOR
LINE TO
SUPPLY TANK
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