Front Axle Service Reservoir Air Supply Valve Operational Check Operational Check

1. Block the wheels.
2. Bleed the air pressure from the supply air reservoir. Refer to Draining Reservoirs .



3. Connect a shop air hose to the inflation valve and fill the supply air reservoir.
4. Verify that the supply air reservoir fills.
5. Remove the wheel blocks.

Front Axle Service Reservoir Air Supply Valve Operational Check Leakage Test

1. Block the wheels.
2. Start the engine.
3. Charge the system to the air compressor governor cut-out point.
4. Stop the engine.
5. Apply a soap solution in order to cover the inflation valve. Leakage is not permissible.

•	If bubbles appear, install the valve core finger tightly and inspect the valve for leaks.

•	If leakage is still present, replace the inflation valve.

6. Remove the wheel blocks.