FAN-CONDENSER 5220801 - Caterpillar

Service the air cleaner only with the engine stopped. Engine damage could result.
Illustration 1 g01063447
The location of the air filter service indicator (1) from the rear view of the engine.Engine air filter service indicator (1) is located on the left side of the machine beneath the engine air precleaner.
Start the engine.
Run the engine at high idle.
Stop the engine.
Open the engine access door on the left side of the machine.
Inspect the engine air filter service indicator. If the yellow piston in the filter service indicator enters the red zone, service the air cleaner.Note: See the Operation and Maintenance Manual, "Engine Air Filter Primary Element - Clean/Replace". See the Operation and Maintenance Manual, "Engine Air Filter Secondary Element - Replace".
Reset the engine air filter service indicator.
Close the engine access door.