Fuel System - Prime
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| NOTICE |
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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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
- Park the machine on a level surface. Ensure that the parking brake is fully engaged. Lower the dump body and stop the engine.
- Open the hood. The priming pump for the fuel system is positioned in the engine compartment on the right side of the engine.
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| Illustration 1 | g00602172 |
- Unlock the priming pump plunger by turning the priming pump plunger counterclockwise and pull out the priming pump plunger.
- Operate the priming pump in order to fill the new filter element. Continue to operate the priming pump until the pump resists operation. This indicates that the filter element is full of fuel.
- Lock the priming pump plunger by pushing the priming pump plunger downward and by turning the priming pump plunger clockwise.
- Start the engine. Look for leaks around the filter element. If the engine will not start, or the engine misfires, more priming of the fuel system is necessary.
- If the engine is running rough after start-up, shut off the engine. Prime the injection pumps and high pressure fuel lines.
Priming the Injection Pumps and High Pressure Lines
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Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool. |
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Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. Clean up fuel spills immediately. |
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The fuel injection nozzles can be permanently damaged by twisting if only one wrench is used to loosen or tighten the fuel line nuts. Use one wrench to hold the nozzle and another to loosen the nut. |
- Park the machine on a level surface. Ensure that the parking brake is fully engaged. Lower the dump body and stop the engine.
- Wrap dry cloths around the fuel injection nozzles in order to soak up the fuel.
- Loosen each of the fuel injection line nuts on the cylinder head of the engine.
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| Illustration 2 | g00634628 |
- Move the throttle control to the LOW IDLE position.
- Turn the engine start switch to the START position. Hold the engine start switch in the START position until the fuel flows free of air bubbles from each of the fuel injection lines.
- Tighten the fuel injection line nuts to a torque of 41 ± 7 N·m (30 ± 5 lb ft).
- Remove the cloths from the fuel injection nozzles and dispose of the cloths safely. Wipe up spilled fuel.
- Start the engine and check for leaks.
- If the engine will not start, more priming of the fuel system is required. If the engine starts but the engine runs rough, continue to run the engine at low idle. Continue to run the engine at low idle until the engine does not run rough.
- Close the hood.
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