DOOR AS 2369319 - 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.
Personal injury or death can occur if personnel are trapped between the wheel and the frame.The steering system is hydraulically controlled and wheels can crush personnel during movement.Use caution when working between the wheels and the frame. If the wheels must be turned, ensure that all personnel are clear of the machine before any movement.
Park the machine on a level surface and engage the parking brake.
Drain the primary air tank and drain the secondary air tank. Refer to Operation and Maintenance Manual, "Air Tank Moisture and Sediment - Drain" for the proper procedure.
Illustration 1 g01426058
(1) Air Dryer
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. Note: Small amounts of moisture may be in the system due to condensation in the system.