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John-Deere Pressure Washer Problems: Engine & Motor

John-Deere pressure washers are known for their heavy-duty applications, making them a preferred choice for commercial cleaning. Despite their reliable built, it is normal for all pressure washers (gas-powered or electric) to occasionally face difficulty in starting, particularly if they aren’t maintained properly. In some cases, the engine could leak oil, or the electric motor could produce a buzzing sound.

John-Deere Pressure Washer Problems: Engine/Motor Troubleshooting & Repair

If a gas-powered John Deere pressure washer doesn’t start, look for debris deposits in the air, fuel filters, and carburetor jets. Check for a vapor lock in the gasoline lines and ensure the fuel tank vents are not clogged with dirt. If your John Deere electric pressure washer doesn’t start, you should begin by checking the voltage, power supply, and fuses. Check for a bad capacitor, a malfunctioning pump, or a pressure buildup in the system if the motor produces a buzzing sound.

The following section of this blog lists all possible issues that can occur with a John-Deere gas or electric pressure washer. In addition to the problems, the specific steps for troubleshooting the root cause are also mentioned. Make sure you scroll down to read in detail.

Problems with the John-Deere Gas Pressure Washer Engine

A four-stroke gas engine drives the pump on the John Deere gas pressure washer. The engine and its accompanying fuel system components (carburetors, filters, and fuel lines) add to the system’s complexity and maintenance requirements. As a result, gas-powered pressure washers sometimes need more maintenance than their electric-powered equivalents.

Some common issues with John-Deere pressure washer engines include: 

● 1. John-Deere Pressure Washer: Keeps Stopping and Starting

If your pressure washer starts and stops often, the problem might be a clogged carburetor jet or a vapor lock in the fuel lines. A blocked fuel filter might sometimes cause a similar problem.

Most engine problems caused by pressure washers are due to old fuel deposits clogging the carburetor jets. As a result, the quantity of fuel that reaches the engine hampers combustion, resulting in the engine’s power reduction.

A vapor lock, in addition to a clogged carburetor or filter, could be the source of the problem. A vapor lock is often caused by an obstruction in the fuel tank vents, which produces a continuous accumulation of gasoline vapors in the fuel lines, affecting the fuel delivery to the engine.

– How to Fix?

To resolve this issue, clean the jets of your carburetor with WD-40 or a carburetor cleaning solution. Ensure that all flow channels have been thoroughly cleaned, including the bowl’s nut, which also serves as a jet. In addition to cleaning the carburetor, you should examine and, if required, replace the fuel filter. In addition to this, I also recommend cleaning the fuel tank vents to prevent vapor collection and vapor lock.

● 2. John-Deere Pressure Washer: The Engine won’t run

If your engine doesn’t start, ensure the spark plug is in good working condition. If the issue continues, remove the carburetor and clean the ports using a liquid carburetor cleaner.

Over time, carbon deposits degrade spark plug electrodes, lowering spark quality and making engine starting more difficult.

– How to Repair?

The spark plug must be removed to inspect the electrodes. If the electrodes are damaged, you should replace the plug. If the issue persists, try cleaning the pressure washer’s carburetor. Detach the carburetor from the pressure washer and thoroughly clean it to remove any fuel residue. I recommend purchasing a carburetor repair kit with a cleaning solution to remove sticky deposits.

● 3. John-Deere Pressure Washer: Engine Stops

If your engine stops after just a few minutes of usage, examine and thoroughly clean the air and fuel filters. You must also examine the fuel tank for vapor lock and ensure that the carburetor is clean and properly tuned.

Impurities are kept out of the carburetor by using air and fuel filters. As a result, dirt accumulates in these filters, upsetting the air-fuel ratio and reducing engine performance. Examine these filters to determine the cause of the problem and, if necessary, clean or replace them. If the issue continues, inspect the fuel tank vents for vapor lock and adjust the carburetor screws.

● 4. John-Deere Pressure Washer: Engine not providing enough Power

If your pressure washer isn’t producing enough pressure, ensure the water supply is enough and the hoses aren’t twisted.

The air-fuel ratio could be too high if the engine isn’t generating enough power. This means that the engine receives too much fuel and not enough air to produce optimum power after combustion. The issue might be with the carburetor, filters, or both.

– How to Repair?

Examine and thoroughly clean the air filter to ensure proper airflow. Furthermore, the carburetor’s L and H screws must be correctly adjusted since they influence the engine’s low and high RPMs.

Furthermore, ensure no air is trapped in the pump and that the hoses are not twisted since this might cause the engine to face substantial back pressure. As a result, the power output may drop.

● 5. John-Deere Pressure Washer: Oil Leak

A worn seal is the most prevalent source of engine oil leaks. Typically, replacing the seal would resolve the problem. An overfilled oil tank could also seem like leaking oil at times.

You may purchase an oil seal kit to help replace different seals. All oil inlets on your engine are usually fitted with oil seals and are placed on both sides of the engine.

– How to Repair?

Remove the seal with a screwdriver and evaluate its condition. It should be changed if it shows indications of wear. Overfilling your oil tank should be avoided as a general precaution since this may cause oil to flow out of these inlets.

● 6. John-Deere Pressure Washer: Water in Oil

The presence of water in engine oil indicates a faulty oil seal. In this instance, you should replace the seal as directed by the manufacturer.

When water and oil are mixed, they form a milky combination. One probable cause is a failed oil seal, and another less frequent cause is a piston that has experienced extreme fatigue. Because of mechanical wear, piston metal chips off with time, increasing the space between the piston and the cylinder walls.

As a result, water from the intake manifold may enter the crankcase and combine with the oil to form a milky suspension.

– Possible solutions:

The seals and gaskets in your engine are vulnerable to damage. In this case, the engine seal/head gasket must be replaced. If your engine is still under warranty, contact the manufacturer to arrange replacements. I would not suggest replacing your seals/gaskets on your own since it would void your warranty. If the warranty on your engine has expired, a professional may be able to repair the seals.

If the piston is worn, check with the manufacturer to determine if the engine is still covered under warranty. If this is not the case, your pressure washer’s engine will stop working after a certain period, and you will need to buy a new pressure washer as this one cannot be repaired.

John-Deere Electric Pressure Washer Problems

Electric pressure washers are less difficult to maintain than their gas-powered counterparts, and the electric motor and battery simplify the design and lower the machine’s maintenance needs. As a consequence, failure risk and noise are considerably reduced, as are harmful emissions. Due to these reasons, the market demand for these pressure washers has significantly increased.

The second part of this blog article focuses on challenges unique to electric pressure washers. The most typical issue with electric pressure washer motors is that they either do not start or quit abruptly. The motor may sometimes hum without generating power.

● John-Deere Electric Pressure Washer not running

If an electric pressure washer won’t start, check the fuse and ensure the electrical socket is working. If the machine remains nonfunctional, the electric motor could be defective.

Check the following if your pressure washer’s motor is not running:

– Step 1: Inspect the electrical outlet

If your electric pressure washer isn’t working, check the outlet. Remove the washer’s cable and use a voltage tester to examine the outlet. Push the reset button if the pressure washer does not start. If the issue continues, check the fuse box circuit breaker.

– Step 2: Examine the Fault Circuit Interrupter

A voltage drop might have triggered the ground fault circuit interrupter (GFCI). Reset the GFCI after unplugging the pressure washer. Allow your pressure washer to dry before reattaching it if it is wet in case it turns on when connected. Perform the following step if the pressure washer does not start after drying.

– Step 3: Examine the Extension Cable

Remove the extension cord from your pressure washer and connect it to a power outlet. Check that the plug is correctly inserted into the socket. The extension cable is most likely to blame if the issue is fixed.

– Step 4: Examine the Fuse

Check the fuse in the machine or the fuse in the socket if the electrical outlet is operational (with a light or other device plugged in), but the machine doesn’t start. If you can’t locate the fuse, see the owner’s handbook. Replace the blown fuse to get the motor working again.

– Step 5: Examine the power line

If the pressure washer continues to be inoperable, the power line may be faulty. This problem might be rectified by changing the power cable. However, you must first determine if the warranty on your pressure washer is still valid. If you cannot change the cable yourself, ask a professional for help.

– Step 6: Inspect the capacitor

A malfunctioning capacitor causes the engine of a pressure washer to make a buzzing sound. If this is the case, you may replace the capacitor yourself. If you lack the necessary experience, you should seek professional assistance. If the pressure washer’s motor does not start following the procedures mentioned above, we may presume that the motor has failed and must be fixed or replaced by the manufacturer.

● John-Deere Electric Pressure Washer Motor Stops

A faulty socket or capacitor is the most common cause of a pressure washer motor not working. A voltage drop in the main plug may sometimes cause the machine to shut off.

The motor stops when the voltage falls below a specified threshold. To verify this, use a multimeter to measure the voltage in the socket. The voltage requirements for pressure washers vary depending on location. Most pressure washers are powered by voltages ranging from 140V to 240V.

If the voltage is enough yet the machine does not power on, the capacitor may need to be changed. This is established when the engine makes a buzzing sound. After replacing the capacitor, the pressure washer must be restarted. If your pressure washer doesn’t start, contact the manufacturer to have the faulty electric motor repaired or replaced.

● John-Deere Electric Pressure Washer Motor Makes a Buzzing Noise

A buzzing noise emerging from the motor of an electric pressure washer indicates a defective capacitor or a high-pressure buildup in the system. The pump could also be damaged in this scenario.

  • Capacitor: A defective capacitor is the most probable cause of the motor humming. Motor RPMs are reduced when charge storage is insufficient. You should try replacing the capacitor to see if the buzzing stops.
  • Low Voltage: If the input voltage is below the operational range of the pressure washer, the motor may not run at the right RPMs and may buzz.
  • Pressure Buildup: When the spray gun is not in use, the water pressure in the hoses rises. Due to the increased back pressure, the pump and motor rotational speed is reduced. Push the spray gun’s release button to reduce engine pressure.
  • Pump damage: If pressure washer pumps are not properly maintained, they might fail and cause engine overheating due to inadequate pump pressure. To maintain long-term performance, make sure your pump is timely lubricated.

John-Deere Pressure Washer troubleshooting table:

The pressure washer is not producing high pressure
Hose with small diameter
Replace your hose with a 1″ (25mm) or 5/8″ (16mm) hose
Restricted water supply to the washer
Check for the kinks and leaks in the hose
Inadequate water supply
Ensure the water source is unobstructed and fully turned on
Clogged intake filter
Remove the filter and rinse it with warm water
Air in the pump
Ensure that the hose and fittings are airtight. Shut off the washer and squeeze the trigger until water flows steadily from the spray tip
The suction tube or detergent bottle is not connected properly
Install the suction tube and detergent bottle correctly
Detergent too thick
Dilute the thick detergent by adding water
Obstructed spray tip
Remove the debris with a needle
No pressure tip on the wand
Install a suitable pressure tip at the end of the wand
If your model has a belt, it can be loose.
Tighten or replace the belt.
Pulsing pressure washer (output pressure varies high and low)
Inadequate water supply
Ensure that the water source is fully on and check the hose for kinks and blockage
Obstructed spray tip
Remove the debris with a needle
Pump sucking air
Ensure that the hose and fittings are airtight. Shut off the washer and squeeze the trigger until water flows steadily from the spray tip
Clogged intake filter
Remove the filter and rinse it with warm water
Calcified hose, tip, or trigger
Clean the hose, pressure tip, or trigger with vinegar or a cleaner designed for this purpose
Noisy Pump
Air in the pump
Ensure that the hose and fittings are airtight. Shut off the washer and squeeze the trigger until water flows steadily from the spray tip
Clogged inlet filter
Remove the filter and rinse it with warm water
Pump leaking water
Damaged or worn water seals
Replace the seals with new ones or call a professional
Loose fittings
Ensure that all the fittings are tight
Erratic water pressure, changing up and down
Unloader valve
Check and clean the unloader valve. If in bad shape, replace it
No output pressure. Or the motor stops when using the trigger (electric models)
Unloader valve
Check and clean the unloader valve. If in bad shape, replace it

● John-Deere Electric Pressure Washer Motor troubleshooting table:

The motor won’t start
The power switch is in the “OFF” or “0”  state
Turn the power switch “ON” or “1”
Cord not plugged
Plugin the power cord
Damaged, too long, or improper extension cord
Replace the existing cord with a 25′ (7.6m) 14 AWG cord or a 50′ (15m) 12 AWG cord
Inadequate power from the electrical outlet
Plug the cord into a different outlet
The pressure washer circuit breaker tripped
Please wait for the washer to cool down and restart it
The motor buzzes but fails to run
Loss in voltage due to the extension cord
Plug the unit directly into the outlet without an extension cord. If the problem isn’t solved, replace the extension cord
Low supply voltage
Ensure that only the pressure washer runs on that circuit at the time of use
Residual pressure in the system
Shut off the washer and squeeze the trigger to release pressure
Residual friction among the internal components
Cut the water supply and turn the machine ON for 2 to 3 seconds. Try it a couple of times or until the motor starts. Don’t let the machine run dry for more than 3 seconds.
Unit not used for long periods
I recommend calling a professional for help
Motor not working
Faulty Timer
Disconnect the leads from the timer. If your pressure washer doesn’t turn off after the time out, the timer is faulty, and you need to replace it.

● John-Deere Gas Pressure Washer Engine troubleshooting table:

Leaks in the spray wand, spray tip, or extension
Damaged or broken O-rings or plastic insert
Replace the worn O-rings or call a professional
Pressure washer pump dripping oil
Worn or damaged oil seals
Inspect the oil seals and replace them if worn
No water from the washer outlet
The water supply is off
Turn the water supply ON
Kink in the hose or faucet not fully open
Remove any kinks and debris from the hose or water lines. Check and fully open the faucet.
The motor won’t start
Check the battery
Check if the battery is charged correctly. Charge or replace when in bad condition. Examine the battery terminals for a proper connection. Clean if needed.
Check the fuel filter
Clean the fuel filter if dirty. In that case, check the gas tank, as this is the most likely culprit.
Check the gas supply
Check the fuel level and add if needed. Ensure that the gas can flow to the carburetor. Remove any blockage.
Check the Air-filter
Clean the air filter. Replace it when it is in bad condition or it is a paper air filter.
Check the carburetor
Remove and clean the carburetor with some carb cleaner. It is also possible to clean it without removing it.
Fuel gap blocked
Check that the hole in the fuel cap is open. Clean if needed.
The engine is stalling, or starts and stops
Check the carburetor
Remove and clean the carburetor with some carb cleaner. It is also possible to clean it without removing it.
Air filter
Clean the air filter. Replace it when it is in bad condition or it is a paper air filter.
Check for bad gas
Suppose you have old gas, more than a few months old. It can turn bad. Drain and replace the gas. Next time add a fuel stabilizer.
  1. Christopher Fox says:

    How can I prevent water from getting into the oil of my pressure washer’s engine?

    • Allard Vdhooft says:

      To prevent water leakage into the oil of your pressure washer’s engine, check the oil seals and ensure they are intact and functioning properly. Regularly inspect and replace worn seals to avoid this issue.

  2. Leslie Wright says:

    I’ve been having issues with my pressure washer, this gave me some ideas on how to fix it

    • Allard Vdhooft says:

      Glad to hear the post was helpful, Leslie! Don’t hesitate to reach out if you have any more questions or need further assistance.

  3. Harper Griffin says:

    I didn’t realize how important it is to clean the air and fuel filters regularly, thanks for the heads up

    • Allard Vdhooft says:

      Thanks for reading! Regular maintenance is key to keeping your pressure washer running smoothly. Happy cleaning!

  4. Oscar Watts says:

    What’s the best way to unclog the fuel lines in a John-Deere pressure washer?

    • Allard Vdhooft says:

      To unclog fuel lines in a John-Deere pressure washer, start by checking carburetor jets, fuel filters, and tank vents. If electric, check voltage and fuses. Clean or replace as needed.

  5. Cathy Mason says:

    I never knew how to check the spark plug on my pressure washer, this article was very helpful

    • Allard Vdhooft says:

      Thank you, Cathy! I’m glad you found the article helpful. If you have any other questions or need further assistance, feel free to reach out. Happy pressure washing!

  6. Celina Hoffman says:

    I appreciate the tips on maintaining the engine of the pressure washer, very useful

    • Allard Vdhooft says:

      Thank you, Celina! I’m glad you found the engine maintenance tips helpful for your pressure washer. Let me know if you have any other questions.

  7. Hunter Garcia says:

    Super helpful information, especially for someone like me who is new to pressure washers

    • Allard Vdhooft says:

      Thank you, Hunter! I’m glad you found the information helpful as a new pressure washer user. If you have any questions or need more assistance, feel free to reach out. Enjoy your pressure washer experience!

  8. Larry Gibson says:

    How often should I clean the carburetor on my John-Deere pressure washer?

    • Allard Vdhooft says:

      For best performance, clean the carburetor on your John-Deere pressure washer annually or as needed. Check for fuel blockages and vapor locks for smoother operation.

  9. Elizabeth Ramirez says:

    What are the signs that the seals on the pressure washer’s engine need to be replaced?

    • Allard Vdhooft says:

      Check for oil leaks around the engine and be aware of any buzzing sounds, which can indicate engine issues. Regular maintenance and inspections can help prevent seal replacement.

  10. Ernest Warren says:

    Very detailed troubleshooting steps, I feel more confident in fixing my pressure washer now

    • Allard Vdhooft says:

      Glad the troubleshooting steps helped! Don’t hesitate to reach out if you need more assistance. Happy pressure washing!

  11. Wyatt Porter says:

    This was so helpful, I had no idea what to do when my pressure washer stopped working

    • Allard Vdhooft says:

      Thank you, Wyatt! I’m glad the information was helpful to you in resolving the issue with your pressure washer. Let me know if you have any other questions!

  12. Juan Welch says:

    Can using a different type of fuel affect the performance of the pressure washer?

    • Allard Vdhooft says:

      Different types of fuel can indeed affect the performance of a pressure washer. The wrong fuel type can damage the engine or reduce its efficiency. Always refer to the manufacturer’s recommendations for the best results.

  13. Justin King says:

    Thank you for the step-by-step guide on troubleshooting pressure washer problems

    • Allard Vdhooft says:

      Thank you for your feedback, Justin. I’m glad you found the troubleshooting guide helpful. Feel free to reach out if you have any more questions.

  14. Sofia Day says:

    I didn’t know about vapor lock in pressure washer engines, thanks for the info

    • Allard Vdhooft says:

      Glad to help, Sofia! Remember to keep up with regular maintenance to avoid issues like vapor lock. Happy cleaning!

  15. Melissa Bennett says:

    I’ll make sure to follow these tips to keep my pressure washer running smoothly, thank you for sharing

    • Allard Vdhooft says:

      Thank you, Melissa! I’m glad you found the tips helpful for your John-Deere pressure washer maintenance. Happy cleaning!

  16. Jared Roberts says:

    I appreciate the detailed troubleshooting steps, it makes it easy to follow

    • Allard Vdhooft says:

      Thank you, Jared! I’m glad you found the troubleshooting steps helpful. Let me know if you have any other questions.

  17. Hilda Cruz says:

    Does the type of water used in the pressure washer affect its performance?

    • Allard Vdhooft says:

      Yes, the type of water used in a pressure washer can affect its performance. Make sure to use clean, fresh water to maintain the integrity of your pressure washer.

  18. Marilyn Williams says:

    Great article, very informative and easy to understand

    • Allard Vdhooft says:

      Thank you, Marilyn! I’m glad you found the article helpful. Let me know if you have any questions about troubleshooting your John Deere pressure washer.

  19. Howard Moore says:

    How can I tell if the pressure washer’s engine isn’t getting enough power?

    • Allard Vdhooft says:

      To diagnose insufficient power in your John Deere pressure washer engine, check for clogged air filters, carburetor jets, and fuel lines. Ensure proper fuel delivery and air intake for optimal performance.

  20. Darren Pearson says:

    Is it normal for the pressure washer to leak oil after long periods of use?

    • Allard Vdhooft says:

      Yes, it is normal for a John-Deere pressure washer to leak oil after long periods of use. The issue might be due to a worn seal or an overfilled oil tank.

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