Katerina Swanson
John Deere tractors are renowned for their reliability, but even these machines can run into problems from time to time. One such issue is the fuel filter, which can cause the tractor to die within a minute of starting. This can be due to the fuel pump starving and kicking itself off, which results in the engine failing to start again. Changing the fuel filters can resolve this issue, but it is crucial to prime them correctly. This process involves getting the primer and the cam in sync, ensuring the cam lobe is in the correct position to allow the transfer pump cam follower to operate effectively.
| Characteristics | Values |
|---|---|
| Engine | Rolls over but doesn't start |
| Sound | Faint mechanical "clank" |
| Potential issue | Fuel pump starving and kicking itself off |
| Solution | Change the fuel filters |
| Issue with solution | Primer pump only catches about 1/3 of its motion |
| Recommendation | Ensure cam lobe is in the correct position to give the transfer pump cam follower space to operate |
| Additional advice | Blow short bursts of compressed air into the fuel tank opening with a rag blocking the fill hole to push fuel through the filter |
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What You'll Learn
- The cam lobe must be correctly positioned to operate the transfer pump cam follower
- Blow short bursts of compressed air into the fuel tank to push fuel through the filter
- Use a rag to block the fill hole when blowing air into the fuel tank
- Pump the engine repeatedly to synchronise the primer and cam
- Check for mechanical issues, like a clank, which may indicate a fuel pump issue
The cam lobe must be correctly positioned to operate the transfer pump cam follower
To prime a 4020 John Deere fuel filter, you must ensure the correct positioning of the cam lobe to operate the transfer pump cam follower. This is essential for the efficient functioning of the fuel pump.
The cam lobe and cam follower have a critical relationship in the context of a fuel pump's performance. The cam lobe's profile and position relative to the cam follower significantly impact the pump's operation. The cam lobe's rotational motion is converted into the reciprocating motion of the fuel pump, so the synchronization between the two components is vital.
The cam lobe's position and profile influence the contact stress between the cam lobe and the cam follower. If the cam lobe is not positioned correctly, it can lead to high contact stress, which can damage the cam lobe and cam follower over time. This positioning is crucial to ensure the efficient transfer of motion and energy to the fuel pump.
To ensure the correct positioning of the cam lobe, several factors must be considered. These include the offset of the cam follower bore axis relative to the cam lobe center, the taper of the lobe face, and the crown of the tappet face. The cam lobe should be positioned to ensure consistent contact geometry with the cam follower while also promoting even wear on the tappet face.
By following these guidelines and ensuring the correct positioning of the cam lobe, you can optimize the performance and longevity of the fuel pump in your 4020 John Deere tractor. Proper cam lobe positioning reduces the risk of damage and ensures efficient fuel delivery to the engine.
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Blow short bursts of compressed air into the fuel tank to push fuel through the filter
If your John Deere tractor is not getting fuel to the filter, there are several steps you can take to troubleshoot the issue. Firstly, check for any blockages in the fuel line or at the bottom of the tank. Disconnect the fuel line from the filter inlet side and direct it into a bottle. Remove the fuel fill cap and try blowing into the tank using your mouth to generate pressure above the liquid fuel. If fuel comes out of the disconnected fuel line, there may be a blockage in the line or tank.
To clear any potential blockages, you can use compressed air. Detach the fuel line from the tank and blow short bursts of compressed air into the line and tank. This will help dislodge any debris or contamination that may be causing the blockage. Ensure you blow at 10-15 psi with the fuel cap removed for effective clearing.
If the issue persists, you may need to replace the fuel filter, spark plug, and carburetor. Additionally, ensure that the carburetor is clean and free of any debris or water contamination. Correct reassembly is critical after cleaning, and all small holes and passageways should be blown dry before reassembling the carburetor.
By following these steps and paying close attention to clearing any blockages, you can effectively prime your John Deere fuel filter and ensure the tractor receives fuel to the filter.
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Use a rag to block the fill hole when blowing air into the fuel tank
When attempting to prime the fuel filter on a John Deere tractor, you may encounter difficulties getting fuel past the filters. In such cases, removing the fuel filler cap and applying a couple of psi of air pressure in the tank with a blow gun is a recommended solution. To maintain this air pressure, a rag is used to block the fill hole.
By plugging the hole with a rag, the air pressure created by the blow gun is contained within the tank. This increase in pressure helps to dislodge any blockages or debris that may be preventing fuel from passing through the filters. The rag acts as a temporary seal, ensuring that the air pressure is directed towards the fuel system, specifically the filters, which require a certain amount of pressure to function effectively.
The technique of using a rag to block the fill hole is particularly useful when dealing with a clogged fuel system. It provides a simple and effective means of increasing the pressure in the tank without requiring complex tools or extensive mechanical knowledge. By following this method, you can often resolve fuel flow issues and get your tractor running smoothly again.
It is important to note that this method should be applied with caution. While using a rag to block the fill hole can be effective, it is crucial to ensure that the rag does not accidentally fall into the tank, as this could create further complications. Additionally, it is always recommended to refer to the manufacturer's guidelines or seek professional assistance if you are unsure about any maintenance or repair procedures.
Overall, using a rag to block the fill hole when blowing air into the fuel tank is a practical solution to prime the fuel filter on a John Deere tractor. It demonstrates a creative approach to troubleshooting and highlights the importance of understanding the underlying principles of mechanical systems.
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Pump the engine repeatedly to synchronise the primer and cam
To prime a 4020 John Deere fuel filter, you must synchronise the primer and cam. This process involves repeatedly pumping the engine to ensure the fuel filter is adequately primed. The primer pump is essential, particularly in diesel engines, as it supplies fuel by distributing it to all components requiring diesel.
The process of synchronising the primer and cam involves the camshaft converting rotational motion to reciprocating motion. This motion is crucial for the intake and expulsion of air, fuel, and exhaust gases. The camshaft's precise engineering ensures the smooth and efficient operation of the engine.
To prime the fuel filter, you must first unlock the primer. This is done by twisting and gently pulling back on the primer knob until it unlocks. Once unlocked, slowly pull the primer knob outward to allow the primer to fill with fuel. Then, slowly push the primer knob inward to force fuel through the fuel lines and nozzles, creating a fine mist as it is injected into the engine cylinders.
It is important to note that pumping the primer too many times can lead to over-priming the engine, which can cause excess fuel to be sprayed into the engine cylinder. This can result in a fire when starting the engine. Therefore, it is crucial to follow the correct procedures and pump the primer the appropriate number of times.
By repeatedly pumping the engine, you ensure that the primer and cam are synchronised, allowing the necessary amount of fuel to be distributed to the engine cylinders. This process is integral to the efficient and safe operation of the engine.
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Check for mechanical issues, like a clank, which may indicate a fuel pump issue
Checking for mechanical issues is an essential step in maintaining the health of your tractor's fuel system, especially when it comes to the fuel pump. A well-functioning fuel pump is critical for optimal engine performance, as it ensures a smooth and consistent supply of fuel to the engine. Here are some detailed steps to help you inspect for any mechanical issues, specifically those related to the fuel pump:
Listen for Unusual Noises: Unusual noises, such as a distinct clanking sound, can be an early indicator of a fuel pump issue. Start by turning on the ignition and listen carefully for any abnormal sounds coming from the fuel pump or the engine compartment. A humming or whining noise, for instance, could suggest that the fuel pump is struggling to build up the necessary fuel pressure.
Check for Leaks and Damage: Before starting the tractor, visually inspect the fuel pump and fuel lines for any signs of leaks or external damage. Look for fuel stains, wet spots, or cracks that could indicate a breach in the fuel system. Leaks can lead to fuel loss and air entering the system, causing the fuel pump to work harder and potentially fail prematurely.
Monitor Engine Performance: Pay close attention to how the engine performs during operation. Difficulty starting the tractor or engine sputtering, especially at high speeds or during acceleration, could indicate an inconsistent fuel supply, which is often linked to fuel pump issues. A loss of power or sudden stalling could also suggest that the fuel pump is not delivering the required fuel pressure.
Measure Fuel Pressure: Use a fuel pressure gauge to measure the actual fuel pressure at the fuel rail. Compare this reading to the manufacturer's specifications for your tractor model. A significant deviation from the recommended pressure could mean that the fuel pump is not performing optimally and may need attention.
Inspect Fuel Levels: Running the tractor on low fuel levels can contribute to fuel pump overheating and reduced lifespan. Always maintain adequate fuel in the tank, as the fuel acts as a coolant for the pump. Running the tractor with consistently low fuel levels can lead to increased pump temperatures and potential malfunction over time.
While the John Deere 4020 tractor is a robust machine, regular maintenance and prompt attention to any mechanical issues are crucial. By following these steps and staying vigilant, you can help ensure the longevity and optimal performance of your tractor's fuel system, including the all-important fuel pump.
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Frequently asked questions
To prime a 4020 John Deere fuel filter, the cam lobe must be in the correct position to give the transfer pump cam follower the space to operate.
If the cam lobe is not in the correct position, the primer pump will only be able to catch about 1/3 of its motion.
If the primer pump is not catching the full motion, try blowing short bursts of compressed air into the fuel tank opening with a rag blocking the fill hole to help push the fuel through the filter and the air out.
You can also try hand-pumping the filters.
The John Deere 4020 uses diesel fuel.
