- The engine is operating at rated speed and at operating temperature and the fuel filter differential pressure reaches 69 kPa (10 psi).
- The fuel filter elements have been used for 1000 hours of operation.
Service tools are available to aid in the service of oil filters and fuel filters. Consult your Caterpillar dealer for the part names and the part numbers. Follow the instructions that are supplied with the service tools. If the service tools are not used, perform the following appropriate procedure.
Replacing the Secondary Filters With the Engine Stopped
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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. |
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- Stop the engine. Connect one end of a hose to each drain valve (2). Insert the other end of the hoses into a suitable container in order to catch the fuel.
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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, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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| Illustration 1 | g00745778 |
(1) Control valve (2) Drain valve (3) Vent plug (4) Cover | |
- Remove both vent plugs (3). Open both drain valves (2) in order to drain the secondary fuel filters.
Note: If the fuel filter is installed vertically, then the drain valves are in the bottom.
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Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component. |
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Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately. |
- Be alert to the spring force. Gradually loosen but do not remove the last two bolts or nuts that are located at opposite corners of cover (4). Before removing the last two bolts or nuts, pry the cover loose in order to relieve any spring pressure.
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Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
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Personal injury can result from parts and/or covers under spring pressure. Spring force will be released when covers are removed. Be prepared to hold spring loaded covers as the bolts are loosened. |
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Note: Some fuel will remain in the housing after the fuel has been drained. This fuel will pour out of the housing when cover (4) is removed. Catch the fuel with a pan. Clean up any spilled fuel with absorbent pillows or towels. DO NOT use absorbent particles to clean up the fuel.
- Remove cover (4) and O-ring seal (5). Inspect the seal for good condition. If a seal is cut, scratched, or cracked, obtain a new seal for assembly.
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| Illustration 2 | g00745776 |
(4) Cover (5) O-ring seal (6) Spring (7) Retainer (8) Rack (9) Filter | |
- Remove spring (6) and retainer (7) .
- Filters (9) are loaded on wire rack (8) that is inside of the housing. Remove wire racks (6). Use a pan to catch the fuel that drips when the rack and filters are removed. Remove the used filters. Clean up any fuel that is spilled.
- Clean cover (4), spring (6), and retainer (7). Clean rack (8) and clean the inside of the housing.
- Inspect 4 new filters for each housing for good condition. Coat the sealing surfaces of the new filters with clean diesel fuel. Place the filters onto rack (8). Install the filters and the rack into the housing.
- Install retainer (7), spring (6), cover (4) and O-ring seal (5). Ensure that the retainer and the spring are seated properly against the filter and the cover. Secure the cover with the bolts.
- Make sure that the drain valves on the covers are closed. Clean vent plugs (3). Install the vent plugs loosely. Prime the fuel system. See this Operation and Maintenance Manual, "Fuel System - Prime" topic (Maintenance Section).
- Start the engine and check for fuel leaks.
Replacing the Secondary Filters During Engine Operation
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Filter contains hot pressurized fluid when engine is running. Follow instructions on control valve to avoid personal injury. If rapid air movement exists to blow fluid, Stop the engine to avoid fire. |
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Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. |
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- To service the lower secondary fuel filter, turn control valve (1) to the "UPPER RUN" position.
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| Illustration 3 | g00745778 |
(1) Control valve (2) Drain valve (3) Vent plug (4) Cover | |
- Connect one end of a hose to drain valve (2). Insert the other end of the hose into a suitable container in order to catch the fuel.
- Remove vent plug (3). Open drain valve (2) in order to drain the secondary fuel filter.
| NOTICE |
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Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component. |
| NOTICE |
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Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately. |
- Perform Steps 3 through 9 from "Replacing the Secondary Filters With the Engine Stopped".
- Close drain valve (2). Clean vent plug (3). Install the vent plug loosely. Slowly turn control valve (1) to the "LOWER FILL" position. After five minutes, turn control valve (1) to the "BOTH RUN" position. Tighten vent plug (3) .
- To service the upper secondary fuel filter, turn control valve (1) to the "LOWER RUN" position. Perform Steps 1 through 5 for the upper secondary fuel filter.
- After both of the secondary fuel filters have been serviced, turn control valve (1) to the "BOTH RUN" position.