PRESS A-HYD- 6V4880 - 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 front wheel on the right side of the machine.When the desiccant cartridge in the air dryer fails to absorb water, the desiccant cartridge must be rebuilt or the desiccant cartridge must be replaced.Check for moisture in the air reservoirs.Replace the air dryer desiccant cartridge or rebuild the air dryer desiccant cartridge if water cannot be absorbed. Consult your Caterpillar dealer for service or for replacement parts.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.