Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 63)

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Service Guidelines
Air Filter Change Air Filter Change
The graphic below shows the location of the air filter in each
wheel valve. Air filters should not be cleaned or reused. This
filter must be replaced with a new filter whenever the tire or
wheel valve is serviced. Use the illustration as reference in
completing the air filter replacement as follows:
Wheel Valve with Tire Hose
1. Working quickly to prevent air loss, remove the tire
hose assembly from the fitting on the tire port (near-
est the tire fill valve) of the wheel valve. Cap hose to
prevent air loss.
2. Use a flat blade screwdriver to dislodge (unscrew
counterclockwise) the air filter from the wheel valve.
Discard the used air filter.
3. Install new air filter by pressing it straight into wheel
valve tire port (oriented as shown below).
4. Remove cap and install tire hose assembly to wheel
valve outlet port and torque to 16-19 lb. ft.
Integrated Wheel Valve
1. Remove all air from tire.
2. Remove valve from wheel (watch for o-rings on
back).
3. Remove air filter from wheel and discard. Install new
air filter by pressing it straight into the wheel (ori-
ented as shown below).
4. Ensure both o-rings are installed on back side of
valve and reinstall to wheel.
5. Re-inflate tire.
Wheel Valve with Tire Hose
Integrated Wheel Valve
Tire
Hose
Air
Filter
Air
Filter
Wheel Valve Control Port
Tire Port
Integrated
Wheel Valve