ELBOW 1S5408 - Caterpillar

Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool.
Making contact with a running engine can cause burns from hot parts and can cause injury from rotating parts.When working on an engine that is running, avoid contact with hot parts and rotating parts.
Inspect the engine air cleaner inlet and ducting in order to ensure that the passageway is not blocked or collapsed.
Inspect the engine air cleaner element. Replace a dirty engine air cleaner element with a clean engine air cleaner element.
Check for dirt tracks on the clean side of the engine air cleaner element. If dirt tracks are observed, contaminants are flowing past the engine air cleaner element and/or the seal for the engine air cleaner element.
For engines with plastic valve mechanism covers, if you experience excessive crankcase pressure, remove the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install" for the correct procedure. Inspect the inside of the valve mechanism cover for debris. Ensure that all of the debris is removed.
Illustration 1 g01332578
(1) Cover
(2) Gauze
(3) O-ring seal
(4) Breather body
(5) O-ring seal
(6) Setscrew
(7) Washer
(8) Adapter plate
(9) O-ring seal
(10) Valve mechanism cover
If the breather tube is made of plastic, use low pressure air to check for a blockage in the breather tube. If a blockage is inside the cover (1), remove the cover (1). Refer to Disassembly and Assembly, "Crankcase Breather - Remove and Install" for the correct procedure. When possible, remove the blockage from the cover (1). If necessary, replace the cover (1).