RING-BACK UP 4Z8659 - Caterpillar

Return Air Filter
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Rear view of typical air conditioning unit
Turn two screws (1) 90 degrees counterclockwise.
Remove cover (2) and the return air filter from the air conditioning unit.
Clean the return air filter using pressure air. When you use air pressure, the maximum air pressure should be 205 kPa (30 psi).
Install the filter, the cover, and the screws on the air conditioning unit.Cab Pressurizer Filter
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Remove knob (3) and plate (4). Remove the filter element.
Clean the filter element with pressure air or wash the element in warm water and a nonsudsing household detergent. When you use air pressure, the maximum air pressure should be 205 kPa (30 psi). When you use water pressure, the maximum water pressure should be 280 kPa (40 psi).
If washed, rinse the element in clean water and air dry thoroughly.
Install the filter.
Install plate (4) and knob (3). Tighten knob (3) finger tight. Do not use a tool to tighten the knobs.