C3.4B Industrial Engine Caterpillar

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Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To help prevent possible injury, turn the start switch off when changing fuel filters or water separator elements. Clean up fuel spills immediately.

Refer to Systems Operation, Testing, and Adjusting, "Cleanliness of Fuel System Components" for detailed information on the standards of cleanliness that must be observed during ALL work on the fuel system.

Remove the Element

1. Turn the fuel supply valve (if equipped) to the OFF position before performing this maintenance.

2. Place a suitable container under the fuel filter in order to catch any fuel that might spill. Clean up any spilled fuel. Clean the outside body of the filter assembly.
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   Illustration 1	g02522536
   Typical example

3. Make a temporary Mark (A) across the filter before the assembly is removed. Install a suitable tube onto drain (4). Open the drain valve (3). Rotate the drain valve counterclockwise. Two full turns are required. Loosen vent screw (1).

   Note: Two complete rotations of the valve will release the valve from the filter element.

4. Allow the fuel to drain into the container. Remove the tube and install the valve into the filter element. Engage the threads of the valve into the filter element. Do not secure the valve.

5. Tighten the vent screw (1) securely.

6. Remove the filter bowl (2). Rotate the filter assembly counterclockwise in order to remove the assembly. Remove the filter bowl, refer to your Cat dealer for the correct tool.
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   Illustration 2	g02522538
   Typical example

7. Rotate the filter element counterclockwise and remove the filter element (5). Clean the filter bowl.

Install the Element

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Illustration 3	g02522540
Typical example

1. Locate the thread in the filter element (7) onto the threads (8). Spin on the element. Do not tighten.

2. Lubricate the O ring seal (6) with clean engine oil. Do NOT fill the filter bowl (2) with fuel before the filter assembly is installed.

3. Do NOT use a tool in order to install the filter assembly. Tighten the assembly by hand. Install the filter bowl (2) and align with your temporary Marks.

4. Tighten the drain valve (3). Turn the fuel supply valve to the ON position.

5. The Primary filter element must be replaced at the same time as the secondary filter element. Refer to the Operation and Maintenance Manual , "Fuel System Primary Filter (Water Separator) Element - Replace".

6. Prime the fuel system. Refer to the Operation and Maintenance Manual, "Fuel System - Prime" for more information.