ADAPTER-FAN 6N2661 - Caterpillar

A service indicator may be mounted on the air cleaner or in a remote location.
Illustration 1 g00476444
Service indicator
Some engines may be equipped with a different service indicator.Observe the service indicator. Clean the air cleaner element or replace the element when the following conditions occur:
The yellow diaphragm enters the red zone.
The red piston locks in the visible position.
The air restriction reaches 3.75 kPa (15 inches of H2O).Inspect the service indicator daily for cracks, holes, or loose fittings. If any of these conditions are present, repair the service indicator or replace the service indicator.Test the Service Indicator After Every 1000 Service Hours
Service indicators are important instruments. Use the following procedure to verify that the service indicator is operating properly.
Illustration 2 g00476445
(1) Fitting
() Reset button
Unscrew the service indicator from fitting (1). A porous filter is part of the fitting.
Inspect the porous filter for cleanliness. Clean the filter, if necessary. Use compressed air or a clean, nonflammable solvent.
Apply vacuum (suction) to the service indicator. The yellow diaphragm should enter the red zone and the piston should lock into position. If this does not occur, obtain a new service indicator.
Reset the service indicator by pressing reset button (2). If the service indicator does not reset easily, obtain a new service indicator.Note: Excessive force may crack the top of the service indicator.
Install the service indicator. Tighten the service indicator to a torque of 2 N m (18 lb in). The service indicator may need to be replaced frequently in environments that are severely dusty. 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.