621G Wheel Tractor-Scraper Caterpillar

Engine Air Filter Service Indicator - Inspect/Replace

Usage:

621G CEN

Open the access door.

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Illustration 1	g00920989

Stop the engine. Check the operation of the service indicator by pressing reset button (1) on the bottom of the service indicator. This should require three pushes or less of the reset button.

Next, check the movement of the yellow piston in the service indicator. Start the engine and accelerate the engine to high idle for a few seconds. After the accelerator control (pedal) is released, the yellow piston should remain at the highest position that was achieved during acceleration.

Note: The air filter indicator should be replaced during engine overhauls. The air filter indicator should also be replaced during replacement of any major engine component. Replace the air filter indicator at least one time per year.

If the indicator will not reset easily, replace the service indicator. If the yellow piston of the indicator will not latch at the highest vacuum that is attained, replace the service indicator. For more information on the air filter indicator, refer to Video Tape, PEVN1736, "Caterpillar Air Filter Service Indicator".

Close the access door.

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