A broken or malfunctioning pull cord spring can prevent your lawn mower from starting, leaving you frustrated on a hot summer day. Understanding the role of the pull cord spring in your mower’s recoil starter mechanism and knowing how to fix it can save you both time and money. In this article, we’ll guide you through the process of fixing a lawn mower pull cord spring, covering common issues, the tools you’ll need, the step-by-step repair process, safety precautions, and maintenance tips to keep your mower in good working order.
Understanding the Pull Cord Spring
The pull cord spring, often referred to as the recoil spring, is a crucial component of the recoil starter mechanism in most lawn mowers. When you pull the starter cord, the spring winds up, storing energy. This energy is then used to retract the cord back into the starter assembly after you’ve pulled it. If the spring is functioning properly, the cord should retract smoothly, making it easy to pull again the next time you start the mower.
Without a properly working spring, your pull cord may not retract, or worse, it may snap or get stuck altogether, leaving you unable to start your mower. To fix this issue, it’s important to first understand what can go wrong with the spring and how to address it.
Common Issues with the Pull Cord Spring
There are a few common problems that occur with the pull cord spring:
1. Broken or Worn-Out Spring
Over time, the pull cord spring can weaken or break due to constant use. A broken spring can lead to the cord not retracting properly or failing to engage when you pull it. In such cases, replacing the spring is necessary.
2. Spring Not Recoiling Properly
Dirt, debris, or misalignment can prevent the spring from recoiling as it should. If the spring is clogged with dirt or the recoil mechanism is out of alignment, it may cause the cord to stick or fail to retract properly. Cleaning the components and realigning the spring can fix this issue.
3. Improper Tension
If the spring is not wound tightly enough, it can fail to generate enough force to retract the pull cord. Conversely, if the spring is wound too tightly, it can cause excessive resistance, making it difficult to pull the cord. Finding the right tension is key to ensuring smooth operation.
Tools and Materials Needed
Before starting the repair, gather the following tools and materials:
- Screwdrivers (flathead and Phillips)
- Pliers (needle-nose pliers are most useful)
- Replacement spring (if necessary)
- Gloves (to protect your hands)
- Safety goggles (to protect your eyes from flying debris or springs)
- WD-40 or another lubricant (for cleaning and lubricating the spring)
- Clean rag (for wiping parts clean)
Step-by-Step Repair Process
Step 1: Disconnect the Spark Plug
Before you start working on your lawn mower, always disconnect the spark plug to avoid any accidental starting of the engine. This is a safety measure to ensure you don’t hurt yourself while repairing the pull cord spring.
Step 2: Remove the Recoil Starter Assembly
To access the pull cord spring, you’ll need to remove the recoil starter assembly. This is the part that houses the spring and the pull cord.
Locate the screws that secure the recoil starter to the mower housing. Most mowers have 3-4 screws.
Use a screwdriver to remove the screws and set them aside.
Lift the recoil starter assembly off the mower carefully. Be mindful of any washers or small parts that may fall off during this process.
Step 3: Inspect the Spring for Damage
Once the recoil starter assembly is removed, you can inspect the pull cord spring. Look for signs of wear, rust, or any breaks in the spring.
If the spring is broken, it will need to be replaced entirely. A broken spring is not repairable.
If the spring looks worn or dirty, you can attempt to clean it and re-tension it.
Step 4: Remove the Damaged Spring (If Necessary)
If you need to replace the spring, follow these steps:
Release the spring tension: Carefully unwind the spring. You can do this by slowly loosening it or using pliers to grip and unwind it. Be cautious—springs are under tension and can snap back suddenly.
Remove the spring from the recoil assembly: Once the tension is released, you can remove the spring from the housing.
Step 5: Install the New or Re-tensioned Spring
If you are replacing the spring with a new one, follow these steps:
Align the new spring in the recoil assembly, ensuring it fits snugly in the designated slot.
Wind the spring: Begin winding the new spring around the spool. Use the appropriate winding tool or your hands, depending on the type of spring. Be sure to wind it tightly but not too tightly, as excessive tension can cause problems later on.
Reattach the spring: Once the spring is wound and properly aligned, secure it in place within the recoil starter housing.
If you are simply re-tensioning the spring:
Clean the spring thoroughly with a rag and lubricant.
Carefully wind the spring back into the housing, ensuring that it is aligned correctly and functions smoothly.
Step 6: Reassemble the Recoil Starter Assembly
After replacing or re-tensioning the spring, it’s time to reassemble the recoil starter.
Place the recoil starter assembly back onto the mower.
Align the screw holes and replace the screws that were removed earlier. Tighten them securely but be careful not to overtighten, as this could damage the assembly.
Reattach the pull cord: If the cord came off during disassembly, carefully wind it back into place and ensure it is positioned correctly in the recoil starter.
Step 7: Test the Pull Cord Mechanism
Once the assembly is reassembled, it’s time to test the pull cord mechanism.
Reconnect the spark plug.
Pull the cord to check if it retracts properly. The cord should pull out smoothly and retract quickly back into the housing.
Test the engine start to ensure that the recoil starter mechanism is working properly.
Safety Precautions
While working on a lawn mower, it’s crucial to follow basic safety precautions:
Disconnect the spark plug before starting any repair work. This is one of the most important safety steps.
Handle sharp components with care: When removing screws or working with the recoil assembly, be mindful of sharp edges that could cause cuts.
Be cautious with spring tension: Springs are under tension and can snap back unexpectedly. Always handle them with care and wear safety goggles to protect your eyes.
Work in a well-ventilated area: If you’re using any lubricants or cleaning agents, make sure the area is well-ventilated to avoid inhaling fumes.
Maintenance Tips
Proper maintenance can extend the life of your lawn mower and prevent future issues with the pull cord spring. Here are some helpful tips:
1. Regular Cleaning
Periodically clean the recoil starter assembly, especially if you’ve been using the mower in dusty or dirty conditions. Dirt and debris can cause the spring to stick or fail to recoil properly.
2. Lubricate the Spring
Apply a small amount of lubricant to the spring and recoil mechanism. This will help the spring move smoothly and prevent rust from forming. Be sure to wipe off any excess lubricant to avoid attracting dirt.
3. Inspect the Spring Regularly
Check the spring for signs of wear or rust at least once a season. If you notice any damage, replace the spring before it completely breaks.
4. Store the Mower Properly
When storing your mower for the off-season, make sure to keep it in a dry area to avoid moisture buildup that can lead to rust on the spring.
Conclusion
Fixing a lawn mower pull cord spring can seem daunting, but with the right tools and knowledge, it’s a repair that you can easily tackle on your own. By understanding the role of the pull cord spring, identifying common issues, and following the step-by-step repair process, you’ll be able to get your mower back in action in no time. Don’t forget to perform regular maintenance to keep your lawn mower in great condition and avoid future problems. With a little care and attention, your lawn mower will continue to start smoothly and reliably for years to come.
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