PIN 3845429 - Caterpillar

Cab Air Filters
Most Caterpillar machines with the R134a system have two cab air filters. One type of air filter is the fresh air filter and the other type of filter is a recirculation filter inside the cab. Some of the machines have a third air filter that is made of foam. The third filter is designed to remove large debris before the air reaches the fresh air filter.Some Caterpillar machines are equipped with a precleaner for the cab. The system is designed to remove excessive dust and dirt from the air that is entering the cab. The precleaner is part of the pressurized cab.There are optional replacement filters that are available for use in the field with certain machine applications. Carbon impregnated filters are used for improved odor reduction in place of the fresh air filter. High efficiency filters are also used as a replacement for the fresh air filter in environments with high concentrations of dust. High efficiency filters also provide better filtering efficiencies in order to reduce the intake of dust into the cab. Filters that are low restriction are also available for certain applications as a way to reduce the system restriction through the filter. Filters that are low restriction reduce the restriction that is in the system, and the filters continue to maintain efficiencies in filtering dust.ReferenceFor optional replacement of filters, see Datasheet, PEHJ0092, "Cat Cabin Air Filters Datasheet".Air filters for Caterpillar cabs are not intended for filtering out hazardous materials. When you are working in an environment with potentially hazardous materials, all of the safety precautions for working with that material should be followed. As the requirements are defined by the local agencies, additional personal protection equipment may be required for the operator.