Some engines are equipped with a differential gauge for inlet air pressure. The gauge reads the difference between inlet air pressure before the air cleaner element and after the air cleaner element. As the air cleaner element becomes dirty, the pressure differential rises. If your engine is equipped with a different type of service indicator, follow the recommendations for the vessel or follow the recommendations in the air cleaner OEM in order to service the air cleaner element.
A service indicator may be mounted on the air cleaner element or in a remote location.
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Typical service indicator | |
Observe the service indicator. The air cleaner element should be cleaned or replaced when the yellow diaphragm enters the red zone or the red piston locks in the visible position. If the service indicator appears red at any time, clean the air cleaner element or install a new air cleaner element.
Service indicators are important instruments.
- Check for ease of resetting. The service indicator should reset in less than three pushes.
- Check the movement of the yellow core when the engine is accelerated to the engine rated rpm. The yellow core should latch approximately at the greatest vacuum that is attained.
If the service indicator does not reset easily, or if the yellow core does not latch at the greatest vacuum, the service indicator should be replaced. If the new service indicator will not reset, the hole for the service indicator may be plugged.
The service indicator may need to be replaced frequently in environments that are severely dusty (if applicable). Replace the service indicator annually regardless of the operating conditions. Replace the service indicator when the engine is overhauled, and whenever major engine components are replaced.
Note: When a new service indicator is installed, excessive force may crack the top of the service indicator. Tighten the service indicator to a torque of
Service the Air Cleaner Element
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Never run the engine without an air cleaner element installed. Never run the engine with a damaged air cleaner element. Do not use air cleaner elements with damaged pleats, gaskets or seals. Dirt entering the engine causes premature wear and damage to engine components. Air cleaner elements help to prevent airborne debris from entering the air inlet. |
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Never service the air cleaner element with the engine running since this will allow dirt to enter the engine. |
If the air cleaner element becomes plugged, the air can split the filter material. Unfiltered air will drastically accelerate internal engine wear. Your Caterpillar dealer has air filter elements in order to service this unit. Consult your Caterpillar dealer for the correct air cleaner element.
If the service indicator appears red at any time, clean the air cleaner element or install a new air cleaner element. Clean the air cleaner element or replace the air cleaner element at 250 hour intervals.
Refer to the Operation and Maintenance Manual for more information on servicing the air cleaner element.