TUBE ASSEM. 3N1597 - Caterpillar

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(1) Air cleaner housing cover
(2) Primary filter element
(3) Secondary filter element
(4) Air cleaner housing
Remove air cleaner housing cover (1).
Remove primary filter element (2) from air cleaner housing (4). Pull out to remove the element.
Mark secondary filter element (3) to show the number of times that the primary filter element has been serviced after installation of this secondary element. Replace the secondary filter element at the time the primary filter element is serviced for the third time. Refer to Operation and Maintenance Manual, Secondary Filter section.
Always replace the secondary filter element. Never attempt to reuse the filter by cleaning.
Clean the inside surface of air cleaner housing (4). Keep the secondary filter element in place while you clean the housing.
If the primary filter element has not been cleaned six times, proceed to Step 6 to inspect the primary filter element. If the primary filter element has been cleaned six times, replace the primary filter element and proceed to Step 10.
Replace both the primary and secondary filter elements when the High Air Inlet Differential Pressure warning occurs a short time after installation of a cleaned primary element.
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Clean side inspection points
(5) Clean face of filter media (inside clean air chamber)
(6) Sealing surface
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Dirty side inspection points
(7) Dirty face of filter media
Inspect the primary filter element (2). Look for any visible damage to the filter media on both the clean face (5) and the dirty face (7). From the dirty side of the filter media, check the bond between the filter media and the plastic filter case. The bond starts at a depth of approximately 20 mm (0.79 inch) into the media. Check the sealing surface (6) on the filter where the filter engages the air cleaner housing (4). If any damage is found, do not reuse the filter.
If the primary filter element is not damaged and the element has not been previously cleaned six times, clean the element only if you use Cat service tool 485-3771. If you do not use this tool, replace the primary filter element and proceed to Step 10. The maximum air pressure for tool 485-3771 is 827 kPa (120 psi). If the air supply pressure is greater than 827 kPa (120 psi), attach Cat service tool 485-3769 to regulate the air pressure.
Use the following process to clean the primary filter element in an open outside area:
Wear appropriate particulate respirator, safety goggles, and hearing protection.
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Part Number 485-3771 inside clean air chamber
(5) Clean face of filter media
(8) Clean Air Chamber
Hold the cleaning tool with two hands and insert the tool into the clean air chamber (8).
Activate air flow with the trigger. With the flat nozzle approximately 3 inches from the face of the filter media (5), move the nozzle slowly up and down and across the face of the filter media. Continue blowing air directly into the inside media face with this motion until you see no more dust exiting the dirty face of the filter media (7).
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(7) Dirty face of filter media
With two hands,