The sweet sound of a lawnmower humming along, conquering your overgrown grass, is often abruptly interrupted by a frustrating “snap.” The pull string – that seemingly simple cord responsible for bringing your mower to life – has given way. Don’t despair! A broken pull string is a common lawnmower problem, and with a little know-how, you can fix it yourself and be back to enjoying a well-manicured lawn in no time. This guide will walk you through the process of identifying the problem, choosing the right replacement, and repairing your lawnmower’s pull string, saving you the hassle (and cost) of calling a repairman.
Understanding the Pull String Mechanism
The pull string is a vital part of your lawnmower’s starting mechanism. It’s connected to a recoil spring, which stores energy when you pull the string. This stored energy is then used to turn the engine’s crankshaft, initiating combustion and starting the mower. When the pull string breaks, the entire starting system is compromised, leaving you unable to fire up your lawnmower.
Identifying the Problem: The Broken Pull String
Before you rush to buy a new pull string, make sure the problem is actually a broken string. Sometimes, the issue might lie elsewhere:
- Tangled String: The pull string can get tangled around the recoil spring or other internal components, preventing it from pulling smoothly.
- Worn Spring: A worn-out recoil spring may not be able to store enough energy to start the engine, causing the pull string to break.
- Binding Mechanism: If the recoil mechanism inside the housing is stuck or jammed, the string may break as it tries to pull against the resistance.
To confirm that the string is the problem, carefully inspect the string:
- Visual Inspection: Check for any visible breaks or tears in the string.
- Test the Pull: Attempt to pull the string gently. If it moves freely, the issue might be elsewhere.
If you discover a broken string, you’re ready to move on to the next step: replacement.
Choosing the Right Replacement Pull String
The right pull string is crucial for smooth operation and longevity. Here’s what to consider:
- Length: Measure the length of the original string from the starting point to the end, ensuring the new string is the same.
- Material: Most pull strings are made of durable nylon or polypropylene. Choose a string that matches the original material for optimal performance.
- Compatibility: Check the string’s compatibility with your lawnmower model. Not all strings are universal, and some manufacturers have specific requirements.
Pro Tip: Look for pull strings with a built-in metal loop. This loop helps prevent the string from fraying or breaking near the attachment point.
Replacing the Broken Pull String: A Step-by-Step Guide
With your new pull string in hand, you’re ready to tackle the repair. Follow these simple steps:
1. Disassemble the Pull String Mechanism
- Locate the Pull String Housing: The housing is usually located on the top or side of the lawnmower, covering the recoil spring and other components.
- Remove the Housing Cover: Depending on your model, the cover may be held in place by screws, clips, or a combination of both. Carefully remove the cover, taking note of any order or position of the screws for reassembly.
2. Remove the Broken String
- Locate the Old String: The string will be attached to the recoil spring and the housing cover.
- Detach the String: Carefully remove the string from both ends, releasing any tension on the recoil spring.
3. Install the New String
- Attach the New String: Thread the new string through the holes or grooves in the housing cover and attach it to the recoil spring. Ensure the string is securely attached to prevent it from slipping.
- Replace the Housing Cover: Carefully put the housing cover back in place, ensuring all screws, clips, or fasteners are secure.
4. Test the New String
- Pull the String: Gently pull the string to ensure it moves freely and the recoil mechanism functions correctly.
- Start the Engine: Attempt to start your lawnmower. If the string engages the engine smoothly, you’ve successfully replaced the broken pull string.
Additional Tips and Troubleshooting
1. Lubricating the Mechanism: After replacing the string, it’s a good idea to lubricate the recoil spring and other moving parts with a light oil or lubricant. This will help reduce friction and wear, improving the longevity of the system.
2. Proper Maintenance: To prevent future pull string issues, regularly inspect the string for signs of wear, fraying, or damage. Also, make sure the recoil mechanism is clean and lubricated.
3. Troubleshoot Further Issues: If you’ve replaced the string and your lawnmower still won’t start, there could be a deeper issue with the recoil spring, the starting mechanism, or other parts of the engine. If you’re unsure how to diagnose or repair these problems, it’s best to consult a qualified lawnmower mechanic.
Conclusion: A DIY Victory Over the Broken Pull String
Repairing a broken pull string on your lawnmower is a relatively simple DIY project that can save you money and frustration. By following the steps outlined in this guide, you can easily replace the broken string, get your lawnmower back in operation, and enjoy a perfectly manicured lawn once again. Remember to always prioritize safety and use caution when working with tools and machinery. And if you ever encounter a more complex issue, don’t hesitate to seek professional assistance.
FAQs
Q1: What is a pull string and why does it break?
A pull string is a vital component in a lawnmower’s starting mechanism. It’s a rope attached to the recoil starter, which is a spring-loaded mechanism that rotates the engine’s crankshaft. The string itself is usually made of nylon or a similar material, designed to withstand repeated pulling and wear. However, it can break due to overuse, wear and tear, or even if it gets caught on something while pulling.
Q2: How do I know if my pull string is broken?
If you’re having trouble starting your lawnmower and hear a clicking sound but no engine crank, it’s likely that your pull string is broken. You can also visually inspect the string for any signs of fraying, wear, or breakage. If you see any of these, then it’s time to replace the string.
Q3: What tools do I need to replace a broken pull string?
You’ll need a few basic tools to replace the pull string. First, you’ll need a Phillips head screwdriver, which is commonly used to remove screws on lawnmowers. Additionally, a pair of pliers can come in handy for gripping the string while you’re pulling it through. You’ll also need a new pull string, which can be purchased at most hardware stores.
Q4: How do I remove the old pull string from the lawnmower?
Locate the recoil starter housing, typically a round plastic or metal cover near the engine. Use a Phillips head screwdriver to remove the screws holding the housing in place. Carefully pry the housing open, taking note of any springs or other components that may be attached to the pull string. You can then carefully pull the old string out of the housing.
Q5: How do I install a new pull string?
With the old pull string removed, thread the new string through the recoil starter housing. Make sure to thread the string through any holes or guides on the housing. This ensures the string properly engages with the starter mechanism. Once the new string is threaded through, carefully close the housing and reattach the screws.
Q6: Do I need to wind the recoil starter after replacing the pull string?
Yes, you need to wind the recoil starter after replacing the pull string. This is important because the starter needs to be wound to store energy and provide the initial power to crank the engine. To wind the starter, simply pull the new string several times until it becomes difficult to pull.
Q7: What if I’m still having trouble starting the lawnmower after replacing the pull string?
If you’ve replaced the pull string but still can’t start the lawnmower, it’s possible that there’s another issue. The problem could be related to the carburetor, spark plug, or a faulty ignition system. In these cases, it’s best to consult a professional mechanic or refer to your lawnmower’s user manual for troubleshooting instructions.