COLLET-BOTTOM 6V4894 - Caterpillar

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.
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The air dryer is located behind the right front suspension cylinder.
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The air tank for the service brake and for the retarder is located on the right platform. The parking and secondary brake air tank is located in the compartment behind the cab.
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The drain valve for the air tank of the service brake and of the retarder is located by the steering hydraulic tank.
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The drain valve for the parking and secondary brake air tank is located by the washer fluid bottle.
Open the drain valves for the air tanks.Note: Small amounts of moisture may be in the system due to internal condensation. 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 remove the moisture from the system.
Check for moisture in the air tanks. Close the drain valves for the air tanks.
If there is moisture in the air tanks, replace the desiccant cartridge or rebuild the desiccant cartridge. Consult your Caterpillar dealer for information about replacing the desiccant cartridge and for instructions for rebuilding the desiccant cartridge.