C4.4 Industrial Engine Caterpillar

Show/hide table

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.
   Show/hide table

   Illustration 1	g03132762
   Typical example

3. 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).

4. Allow the fuel to drain into the container and remove the tube.

5. Tighten the vent screw (1) securely.

6. Remove the filter bowl (2). Rotate the filter assembly counterclockwise in order to remove the assembly. Refer to your caterpillar dealer for the correct tool number.
   Show/hide table

   Illustration 2	g02546456
   Typical example

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

Install the Element

Show/hide table

Illustration 3	g03132767
Typical example

1. Locate the thread (7) in the filter element onto the threads (8). Spin on the element and tighten the drain valve (3) by hand.

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). Turn the filter bowl clockwise until the filter bowl locks into position against the stops.

4. Turn the fuel supply valve to the ON position.

5. The primary fuel filter and the secondary fuel filter must be replaced at the same time. Refer to the Operation and Maintenance Manual , "Fuel System Primary Filter (Water Separator) Element - Replace". Also, the in-line fuel must be replaced when the primary and secondary filters are replaced. Refer to Operation and Maintenance Manual , "Fuel Filter (In-Line) - Replace"

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