143H and 163H Motor Graders Caterpillar

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The air lines to and from the air dryer must be at atmospheric pressure. If the air lines are not at atmospheric pressure, personal injury could result. Release the air pressure from the air system completely before performing maintenance.

The air dryer is positioned on the left side at the rear of the machine.

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Illustration 1	g00117912

1. Open the drain valves for the air tanks. The air tanks are positioned below the radiator at the rear of the machine.

2. Check for moisture in the air tanks. Close the drain valves for the air tanks.

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Illustration 2	g00681732

3. If moisture is present in the air tanks, replace the desiccant cartridge for the air dryer or rebuild the desiccant cartridge for the air dryer. Consult your Caterpillar dealer for information about replacing the desiccant cartridge and for instructions for rebuilding the desiccant cartridge.

Note: Small amounts of moisture may be in the system due to condensation in the system. Moisture may also be in the system if an air dryer is installed on a machine that has been operating without an air dryer. Several weeks may be required in order to completely dry the system.