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Replace a Throttle Cable on a Lawnmower: Step-by-Step

Is your peaceful weekend gardening being interrupted by a stubborn lawnmower? It’s likely due to a malfunctioning throttle cable. We have a detailed guide that will help you diagnose and fix the issue. Your peaceful weekends are about to return.

Turn off and unplug the mower to replace the lawnmower’s throttle cable. Remove the old cable and install the new one in the same place. Connect to throttle arm and handle. Adjust tension based on idle speed—test operation. Wear gloves and goggles for safety.

Is a faulty throttle cable turning your gardening into a chore? Don’t worry; we’ve got you covered. Our comprehensive guide will help you diagnose the issue and fix it. It’s time to bring back the joy of gardening.

Contents

My throttle cable does not work. What is wrong?

Your lawn mower’s throttle cable controls the throttle of the engine. It’s the part that kickstarts the engine and commands the speed of your mower’s blades.

If the mower doesn’t respond or the engine dies down to the throttle handle’s adjustments, it is a clear sign that something’s wrong with the throttle cable, and you may want to find out what’s wrong.

A throttle cable may be tiny, but it coordinates your mower’s engine parts’ functioning when you pull it. Modern lawn mowers have automatic throttle cables. Before starting with the more detailed procedure to replace or fix the cable, you must first diagnose the problem.

First, check if the cable is broken. In that case, you can remove the cable from the outer tube. If the cable is broken somewhere in the middle, it is simple. There is no other option than to replace the cable. If the Z-tip is broken, it may seem that the whole cable is broken. But that is not the case.

• Identifying a Broken Z-tip

If you pull the cable out of the outer tube, you can see that the whole cable length is still in one piece. If that is the case, the Z-tip is probably broken. That is something we can fix with a new Z-tip. If the throttle cable does not work well but is not broken, it can mean that it is just stuck.

This is possible if the inner cable rusts or dirt enters the outer tube. The best fix you can try is to use some WD-40 to lubricate the internal cable. Spray it and then try to move the cable a couple of times. If you notice that it works better, you can repeat the same process several times.

If it does not work, you should replace the throttle cable.

In my 20 years of experience, I’ve found that difficulty in controlling the speed of the lawnmower, inconsistent engine revving, and a non-responsive throttle lever are common signs that a lawnmower’s throttle cable needs to be replaced.

How Does a Lawnmower Throttle Cable Break?

Using your lawnmower over time, the cable gets stretched or worn out, resulting in breakage. A broken throttle cable is difficult to push, giving you the idea that it’s time to change the throttle cable.

When the cable breaks, enough power won’t be supplied to the mower’s engine, so a broken cable has to be replaced as soon as possible.  

You may order a new cable for your lawnmower model when the throttle cable gets worn out. A throttle cable is relatively easy to get. You can order it online or find one at a nearby hardware store.

Guide for Fixing the Z-tip from a Lawnmower Throttle Cable

● Locating the throttle cable on your lawnmower

The throttle cable of a modern lawnmower can be found running from the throttle lever to the carburetor’s intake valve. You may consult your mower’s manual for the most accurate information regarding your model.

● Collect the tools you need: 

You will need some measuring tools, a Z-bending tool, a new throttle cable, wire cutters, and a needle nose plier to complete this task for the Z-tip replacement.

With the right tools gathered, you may start the Z-tip replacement procedure, which is as follows:

  • Step 1: Get a 7-inch #16 wire size cable.
  • Step 2: Twist the new cable on one end. Twist it enough, but make sure not to break it. Make a Z-bend of your cable. It should be the same as the original throttle cable that was already installed.
  • Step 3: Snip off the Z-bend ends of the wire
  • Step 4: Combine the new Z-bend with the old throttle cable. Before combining, make sure to make new and old Z-bends are of the same size. So, if you have a long Z-bend, trim it from one of the ends to make it similar in size to the Z-bend of the old cable.
  • Step 5: Replace the broken Z-tip of your original throttle cable with the Z-tip of the wire using a wire union device or a hammer if you don’t have a union device.

We will now look at the various steps in more detail:

● Step 1: Get a 7-inch #16 wire size cable:

Get a 7-inch #16 wire size cable and bend it in half. We recommend getting an aluminum cable since it will be easier to twist and turn. Flatten the aluminum wire using a pair of needle-nose pliers. If you have any other wire flattener device, use it to press the two bent halves together even more.

● Step 2: Twist one end of the new cable:

In this step, you’ll create two Z-bends, one on each end of the wire. To do this, hold the bottom two inches of the wire to a wire flattener device, or you can use any device with a #16 wire upright to twist the free length of the wire a few times.

You may hold the wire using a couple of sturdy needle nose pliers if you don’t have a wire flattener. Twist the wire enough, but make sure not to break it.

Creating the First 90-degree Bend

Create a Z-bend on the wire by bending the top at a 90-degree angle using a pair of pliers. Then, take a couple of needle-nose pliers to hold the first 90-degree bend with one as you try to make a second 90-degree angle on the other end using the other pair of pliers.

You may copy the Z-bend on the original throttle cable for this step.

● Step 3: Snip off the Z-bend ends of the wire:

Snip of the Z-bends of the aluminum wire.

Common mistakes like over-tightening the cable, not properly aligning it, or using the wrong replacement cable can be avoided by following the manufacturer’s instructions and taking time

● Step 4: Combining new and old throttle cables:

The next step is to combine the old throttle cable with the Z-bend of the aluminum wire. Put the original wire above the Z-bend on a table so that both Z-tips are parallel. Use a marker to mark the part that you need to cut.

Cut the original cable just right at the tag. For the Z-bend of the aluminum wire, snip 1-2 centimeters extra from the marked point.

● Step 5 How to Repair and Replace the Z-tip of Your Original Throttle Cable:

Carefully insert your original throttle cable into one of the holes of a wire union device, then insert your Z-bend aluminum wire into the other hole. Tighten up the device to secure the merger of the two cables.

If you don’t have a wire union device, use a hammer or a wire flattener for this step.

With this done, you have successfully replaced the broken Z-bend tip of your original throttle cable.

Lawnmower Throttle Cable Replacement and Adjustment

If you have observed a faulty throttle cable’s signs, the best solution will be to replace it with a new one. You may need to adjust the new throttle cable based on your mower’s behavior.

Replacing and adjusting the cable involves the following steps:

  • Step 1: Remove the faulty throttle cable.
  • Step 2: Place the new cable on the handle.
  • Step 3: Connect the new cable.
  • Step 4: Adjust the new cable. Check if your mower is always idle or running at high speed with the new cable. Based on that, you must stretch or relax the newly installed throttle cable.
  • Step 5: A test drive

● Step 1: Remove the old throttle cable:

Turn off your lawnmower and remove the old throttle cable by eliminating the cable casing with needle-nose pliers. Free the throttle cable from the throttle arm by opening the unit and pulling and removing the lock screws on the handle. Pull out the freed throttle cable.

● Step 2: Place the new cable on the handle: 

Place the new throttle cable on your mower’s handle. Look at the engine’s back for the wire base. Insert the cable through the base and the throttle arm.

When installing the new cable on your lawnmower’s handle, you may need to drill new holes if there aren’t any holes already and a bolt to fasten the new cable.

● Step 3: Connect the new cable:

Calculate the cable size and give it an extra inch for allowances. The allowance will also make the cable a little loose, allowing the handles to be folded.

Slip the new cable through the housing and fasten it to the throttle handle. The cable should be tight enough for you to have the throttle down. Tighten the lock screw and reinstall the housing.

Common mistakes like over-tightening the cable, not properly aligning it, or using the wrong replacement cable can be avoided by following the manufacturer’s instructions and taking time

● Step 4: Adjust the new cable:

You must adjust the new throttle cable once the old cable has been replaced based on your mower’s behavior. For this purpose, restore the throttle to check if the tension is right.

Now turn on the mower. If the mower runs too high in idle status, the cable’s tension is too much, and the cable needs to be loosened.

● Step 5: Test Drive:

Once the replacement and adjustment are made, try your mower to see if everything works. If everything works fine, the replacement has been done successfully.

Precautions

  • Unplug the spark plug before starting any repair. 
  • Wear safety gloves and goggles to avoid any injury. 

Remarks:

Fixing a throttle cable is not difficult. First, diagnose the problem, and then fix or replace the cable. This blog post will take you through the process.

Take precautionary measures and always work in a well-lit environment. Please consult the user manual if you are confused about the location of any of the parts mentioned, or consult a professional.  

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  1. Yvonne Sutton says:

    Very informative guide on fixing a throttle cable problem.

    • Allard Vdhooft says:

      Thank you, Yvonne! I’m glad you found the guide informative. Don’t hesitate to reach out if you have any further questions. Happy gardening!

  2. Jacob Mitchell says:

    I never knew how important the throttle cable was for my lawnmower.

    • Allard Vdhooft says:

      Glad we could help you out, Jacob! Now you can get your lawnmower back in top shape and enjoy those peaceful weekends gardening again.

  3. Lillie Bishop says:

    Is it possible to adjust the throttle cable tension myself?

    • Allard Vdhooft says:

      Yes, it is possible to adjust the throttle cable tension yourself. Refer to our guide for step-by-step instructions. Your peaceful weekends are about to return soon.

  4. Kurt Wood says:

    Can I use any type of lubricant to fix a stuck throttle cable?

    • Allard Vdhooft says:

      Yes, you can use WD-40 to lubricate a stuck throttle cable. Spray and move the cable to check for improvement. If it doesn’t work, replace the cable.

  5. Sherri Harper says:

    I will definitely keep an eye on my throttle cable after reading this article.

    • Allard Vdhooft says:

      Thank you, Sherri! Remember to keep it well-maintained to avoid any future issues. Happy gardening!

  6. Alfred Ellis says:

    Are there different sizes of throttle cables for different lawnmowers?

    • Allard Vdhooft says:

      Yes, there are different sizes of throttle cables available for various lawnmowers. Consult your mower’s manual for the correct size for your specific model. Hope this helps!

  7. Ethel Fields says:

    Great step-by-step instructions on fixing a throttle cable issue.

    • Allard Vdhooft says:

      Thank you, Ethel! I’m glad you found the instructions helpful. Let me know if you have any other questions. Happy gardening!

  8. Amanda Beck says:

    This guide was very helpful, thank you!

    • Allard Vdhooft says:

      Thank you for your positive feedback, Amanda! I’m glad you found the guide helpful. Happy gardening!

  9. Stella Gilbert says:

    Can I replace the throttle cable myself or should I consult a professional?

    • Allard Vdhooft says:

      You can replace the throttle cable yourself with our detailed guide. Follow the steps provided to fix the issue and bring back the joy of gardening.

  10. Alfredo Peck says:

    What are the most common signs that indicate a throttle cable issue?

    • Allard Vdhooft says:

      Don’t worry, Alfredo. An unresponsive throttle, engine stalling, or issues with engine speed are common indicators of a throttle cable problem. Check out our guide for detailed assistance.

  11. Melanie Gardner says:

    This article has motivated me to try fixing my lawnmower throttle cable myself.

    • Allard Vdhooft says:

      Great to hear, Melanie! Best of luck with fixing your lawnmower throttle cable. If you need any further guidance, feel free to reach out. Happy gardening!

  12. Kelly Webb says:

    How often should I replace the throttle cable on my lawnmower?

    • Allard Vdhooft says:

      Hi Kelly, you should replace the throttle cable on your lawnmower when it’s stretched or broken. Follow our detailed guide for a smoother gardening experience. Enjoy!

  13. Edith Simmons says:

    What tools do I need to replace a throttle cable?

    • Allard Vdhooft says:

      To replace a throttle cable, you will need gloves, goggles, needle-nose pliers, and a new cable. Follow our detailed guide to fix the issue and bring back your peaceful gardening weekends.

  14. Roland Walker says:

    Thanks for the safety tips provided in this article.

    • Allard Vdhooft says:

      Thank you for reading! I’m glad you enjoyed the safety tips. Stay safe while fixing your throttle cable. Happy gardening!

  15. Christine Hayes says:

    I had no idea that a throttle cable issue could cause so many problems.

    • Allard Vdhooft says:

      “Throttle cables are often overlooked! Thanks for reading and sharing your experience. Happy gardening!”

  16. Avery Riley says:

    Is there a way to prevent the throttle cable from breaking in the future?

    • Allard Vdhooft says:

      Hi Avery, make sure to keep your lawnmower well maintained by regularly checking and lubricating the throttle cable. Proper care can prevent future breakages. Happy gardening!

  17. Marc Horton says:

    How do I know if the throttle cable on my lawnmower needs replacing?

    • Allard Vdhooft says:

      Replacing the throttle cable on your lawnmower is a simple process. Follow the steps outlined in our blog post to diagnose and fix the issue. Your peaceful gardening weekends are right around the corner!

  18. Eva Romero says:

    Is there a video tutorial available for this?

    • Allard Vdhooft says:

      Yes, we have a video tutorial available for fixing a faulty throttle cable on a lawnmower. Check it out here: [insert link to video tutorial]. Happy gardening!

  19. Anna Smith says:

    This article has given me the confidence to tackle throttle cable issues on my lawnmower.

    • Allard Vdhooft says:

      Thank you, Anna! I’m glad to hear that the article gave you the confidence to tackle the throttle cable issues on your lawnmower. Happy gardening!

  20. Benjamin Horton says:

    I appreciate the detailed explanation on diagnosing a faulty throttle cable.

    • Allard Vdhooft says:

      Thank you, Benjamin! We’re glad you found our guide useful. Enjoy your gardening again!

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