VALVE GP-MANUAL 3892407 - Caterpillar

Replace the Soot Filter
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.
Unfiltered air will drastically accelerate internal engine wear. The air silencer is wrapped in a disposable soot filter. The soot filter helps prevent airborne dust and debris from entering the air inlet. As the soot filter becomes dirty, the air restriction increases. Replace the soot filter when the air restriction reaches 3.75 kPa (15 inches of water).
Never service the air cleaner element with the engine running since this will allow dirt to enter the engine.
Remove the used soot filter from the air silencer. Discard the used soot filter.
Inspect the air silencer. Clean the air silencer, if necessary.
Install a new soot filter.