XQ125 Generator Set Caterpillar

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Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact the skin.

The crankcase breather is a very important component in order to keep your engine emissions compliant.

• The filter element within the crankcase breather must be serviced at the prescribed service interval.

• The correct filter element must be installed before the engine is operated.

• The installation of the filter element is very important.

• The quality of the filter element that is installed is very important.

• The filter element protects the engine from excessive quantities of oil from entering the induction system. The filter element also protects the engine aftertreatment system.

Note: Excessive quantities of oil that enter the induction system of the engine can rapidly increase the engine speed without control.

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Illustration 1	g02415998
Typical example

1. Ensure that dirt cannot enter the breather assembly. Ensure that the outside body of the breather assembly is clean and free from damage. Place a container under the breather assembly.

2. Rotate the cap (1) counterclockwise into the unlocked position. Remove the cap from the body of the breather (3).

3. Note the orientation of the filter element (2). Remove the filter element .
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   Illustration 2	g01884135
   (B) Alignment position

   Note: The cut away from section (5) in the cap allows access to the seal.

4. Remove the old seal (4) and install a new seal.

5. Install a new filter element into the breather body (3) and orient the filter element so that position (A) is aligned. Refer to illustration 1. Align position (A) on the filter element to position (B) on the cap.
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   Illustration 3	g02415999
   Typical example

6. Install the cap (1). Rotate the cap by hand clockwise until the cap locks into the locked position C on the breather body.

7. Remove the container.

Check the System

Illustration 4	g02416001
(1) Connection to breather cap for the engine (2) Oil drain (3) Tube assembly to atmosphere (4) Outlet

Check the system for damage. Replace any component that is damaged. Ensure that the outlet (4) is clear and free from obstructions.