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Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. Turn the disconnect switch OFF when draining and/or removing any fuel system components. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
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Do not fill the fuel filters with fuel before installing the fuel filters. The fuel will not be filtered and could be contaminated. Contaminated fuel will cause accelerated wear to fuel system parts. |
Note: Always use fuel approved as per ISO 18 cleanliness standard.
Refer to Operation and Maintenance Manual, "Access Doors and Covers" for the location of the service points.
Primary Filter (Water Separator) Element
- Clean around the primary fuel filter housing and base. Inspect for any leakage between the filter housing and the filter base.
Note: Fuel leakage at this interface may indicate damage or contamination in the threads.
- Disconnect the WIF (water in fuel) sensor. Allow the sensor and pigtail to be removed with the filter housing.
- Attach the drain line to the drain valve at the bottom of the filter housing.
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Illustration 2 g06339509 Bleed screw - Loosen the drain valve and bleed screw to drain the fuel from the housing. Catch fuel in a suitable container.
- Retighten the drain valve and the bleed screw once the fluid flow has stopped. Remove the drain line.
- Use a wrench or strap wrench to loosen and remove the filter housing from the base.
Note: The filter element is retained in the filter housing and will be removed as a single assembly.
- Remove the old filter element from the filter housing by loosening the drain valve and unscrewing the filter element from the housing.
Note: A small amount of fuel will remain in the bottom of the housing which must be dumped into a suitable container.
- Clean the inside of the filter housing and filter base with a lint free towel. Inspect sealing surfaces of the filter housing and the filter base to ensure that no seal material from the old filter is present.
- Lubricate the sealing surfaces of the new filter element with clean diesel fuel. Install the new filter into the filter housing. The new filter will screw onto the drain valve and the bottom of the housing. Tighten the drain valve to seat the filter fully into the filter housing.
Note: Do not pre-fill the fuel filter housing before installation. Contamination could result.
- Install the filter housing and filter element into the filter base. Tighten the housing until positive stop is reached. Ensure that there is no gap between the filter housing and filter base.
- Reconnect the WIF sensor and secure the pigtail as needed.
- Prime the fuel system. See Operation and Maintenance Manual, "Fuel System - Prime" for the proper procedure.
- Start the engine and check for leaks.
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| Illustration 1 | g06351145 |
- The secondary fuel filters are on the rear left side of the machine.
- Clean around the secondary/tertiary fuel filter housings and base. Inspect for any leakage between the filter housings and filter base in the area of the threads. Fuel leakage at this interface may indicate damage or contamination in the threads.
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Illustration 3 g06351157 - Attach the drain line to drain valve (2) at the bottom of filter housing (1).
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Illustration 4 g06351318 - Loosen the drain valve and bleed screw to drain fuel from the housing. Catch the fuel in a suitable container.
- Tighten the drain valve once fluid flow has stopped.
- Swap the drain line to second housing/drain valve and repeat the previous 2 steps to drain the second fuel filter housing.
- Hand tighten the second drain valve and bleed screw once fluid flow has stopped.
- Use a wrench or strap wrench to loosen and remove the filter housings from the base.
Note: The filter elements are retained in the filter housings and will be removed as an assembly.
- Remove the old filter elements from the filter housings by loosening the drain valves and unscrewing the filter elements from the housing. A small amount of the residual fuel will remain in the bottom of the housing which must be dumped into a suitable container.
- Clean the inside of the filter housings and filter base with a lint free towel. Inspect sealing surfaces of the filter housings and filter base to ensure that no seal material from the old filters is present.
- Lubricate the sealing surfaces of the new filter elements with clean diesel fuel. Install the new filters into the filter housings. The new filters will screw onto the drain valve at the bottom of the housing. Hand tighten the drain valve to seat the filter elements fully into the filter housings.
Note: Do not pre-fill the fuel filter housings before installation. Contamination could result.
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Illustration 5 g06351159 - Install the filter housings and filter elements into to the filter base. Tighten the housings until positive stop is reached. Ensure that there is not gap between the filter housings and filter base.
- Prime the fuel system. Refer to Operation and Maintenance Manual, "Fuel System - Prime" for the proper procedure.
- Start the engine and check for leaks.
- Close the access door.
