BRACKET AS 3970722 - Caterpillar

Illustration 1 g00366677
Open the access cover on the right side of the machine.
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Note: You must drain secondary fuel filter element (1) before the removal or the replacement of either filter element.
Place a suitable container under valves (2) and (4). Open valve (2) in order to drain upper secondary fuel filter element (1). Immediately open drain valve (4) after opening drain valve (2). This sequence prevents an air lock in the fuel system.Note: Every new oil filter has rotation index marks that are spaced at 90 degree increments. Use the rotation index marks as a guide for tightening the oil filter.
Slightly loosen upper secondary fuel filter element (1) by 90 degrees. As the filter is loosened, additional fuel may drain. Loosen the filter by another 90 degrees, and continue loosening the filter in 90 degree increments until no fuel drains from the drain valves.
Close drain valves (2) and (4) .
Remove upper secondary fuel filter element (1). Use care in order to avoid spilling fuel from the filter element as you remove the element.Note: The upper secondary fuel filter element and the lower secondary fuel filter element are different part numbers.
Install a new upper secondary filter element. In order to prevent contamination of the fuel system, do not fill the element with fuel before you install the filter element. When the gasket contacts the filter base, turn the filter by 270 degrees more. This will tighten the filter sufficiently.
Remove lower secondary fuel filter element (3). Use caution when you remove the element in order to avoid spilling the fuel that is in the element.
Install a new lower secondary filter element. In order to prevent contamination of the fuel system, do not fill the element with fuel before you install the filter element. When the gasket contacts the filter base, turn the filter by 270 degrees more. This will tighten the filter sufficiently.
Prime the fuel system. See the Operation and Maintenance Manual, "Fuel System - Prime".
Start the engine and check for leaks.
Close the access door.