That frustrating moment when the pull string snaps back without engaging the engine signals a common fix. Learning how to fix the pull string on a lawn mower is a straightforward repair that can save you time and money. With a few basic tools and some patience, you can have your mower running again in no time.
This guide will walk you through the entire process, from diagnosis to reassembly. We’ll cover the common causes of pull cord failure and provide clear, step-by-step instructions.
How To Fix The Pull String On A Lawn Mower
The pull string, or recoil starter, assembly is a simple but crucial system. When you pull the handle, the cord unwinds from a pulley, turning the engine’s crankshaft to start it. A spring inside recoils the cord back. Problems occur when the cord breaks, the spring fails, or the pulley mechanism jams.
Tools And Parts You Will Need
Before you begin, gather these items. Having everything on hand will make the repair smoother.
- Replacement pull cord (check your mower’s manual for length and thickness)
- Screwdrivers (flathead and Phillips, as needed for your model)
- Socket set or wrenches
- Needle-nose pliers
- A pair of gloves to protect your hands
- Safety glasses
- Replacement recoil spring (if necessary)
- Light machine oil or grease
Safety First: Preparing Your Mower
Always prioritize safety before starting any repair. A few simple steps will prevent accidents.
- Disconnect the spark plug wire. This is the most important step to ensure the engine cannot start accidentally.
- Tip the mower on its side, with the air filter and carburetor facing up. This prevents oil and fuel from leaking into these sensitive areas.
- Clean any loose grass and debris from around the starter assembly housing. This stops dirt from falling into the engine during the repair.
Locating The Recoil Starter Assembly
The recoil starter is typically housed under a plastic or metal cover on the top of the mower engine. It is held in place by several screws. Sometimes it’s integrated into the blower housing. Refer to your mower’s manual for the exact location if your unsure.
Step-By-Step Repair Process
Follow these steps carefully to fix your lawn mower’s pull string.
Step 1: Removing The Starter Housing
Use the appropriate screwdriver or socket to remove the screws securing the starter cover. Keep the screws in a safe place. Gently lift the cover away to reveal the pulley and spring mechanism inside. Be cautious, as the recoil spring is under tension.
Step 2: Assessing The Damage
Look closely at the assembly. Identify the problem. Is the cord completely broken? Is it frayed but still attached? Has the cord come un-wound from the pulley? This assessment determines your next steps.
- Broken Cord: You will need to replace the entire cord.
- Frayed Cord: Replacement is still the best option to prevent future snaps.
- Detached Cord: The cord may have simply come untied from the pulley or handle.
- Broken Spring: If the pulley does not recoil at all, the spring may be broken or disconnected.
Step 3: Releasing The Old Cord And Spring Tension
This step requires care. Hold the pulley firmly with one hand. Slowly let it rotate in the direction of the winding to release any remaining tension in the spring. Use your pliers to untie or release the knot holding the old cord in the center of the pulley. Remove the old cord completely.
Step 4: Installing The New Pull Cord
- Feed one end of the new cord through the hole in the starter housing where the handle will be.
- Tie a secure knot on the new handle, or reattach the old handle if it’s in good condition.
- Wind the pulley in the direction opposite of the recoil spring’s tension (usually clockwise) for about 2-3 turns. This pre-tensions the spring.
- While holding the pulley to prevent it from spinning, feed the other end of the cord through the anchor hole in the pulley.
- Pull the cord tight and tie a strong, reliable knot. A figure-eight or double overhand knot works well. Trim any excess cord, leaving about half an inch.
Step 5: Rewinding The Recoil Spring
If your spring is still good, you now need to wind the cord onto the pulley. Slowly release your hold on the pulley, allowing the spring to pull the cord into the housing, winding it neatly around the pulley. If the spring is broken, you’ll need to replace it, which involves carefully removing the pulley and installing a new spring—a more delicate task.
Step 6: Reassembling The Housing
Before putting the cover back on, pull the cord out fully to check for smooth operation. It should extend and retract smoothly. Apply a small drop of oil to the center of the pulley where it rotates. Carefully place the cover back over the assembly, ensuring the pull cord exits cleanly through its guide hole. Reinstall and tighten all screws securely.
Testing Your Repair
Once reassembled, it’s time to test your work. First, return the mower to its upright position. Reconnect the spark plug wire. Give the pull cord a few slow, full pulls to ensure everything engages and feels smooth. Then, try starting the engine normally. If it starts, you’ve successfully fixed the pull string.
Common Problems And Troubleshooting
Sometimes, the repair doesn’t go perfectly. Here are solutions to frequent issues.
The Cord Is Hard To Pull Or Jerky
This often indicates a problem with the recoil spring or a misaligned pulley. The spring may be over-wound or binding. You may need to disassemble again and check the spring’s seating. Also, ensure the pulley is sitting flat and not rubbing against the housing.
The Cord Does Not Recoil Back In
The recoil spring is likely broken, disconnected, or has lost its tension. The spring will need to be replaced. This is a common failure point, especially on older mowers.
The Engine Cranks But Doesn’t Start
If the cord turns the engine over but it won’t fire, your pull string repair was successful, but the problem lies elsewhere. Check your spark plug, air filter, and fuel system. The starter’s job is just to turn the engine.
Preventative Maintenance Tips
To avoid future pull string problems, a little maintenance goes a long way. Regular care can extend the life of your starter assembly significantly.
- Periodically clean grass clippings and debris from around the starter housing.
- Lubricate the pulley post with a light oil once a season.
- Avoid yanking the cord violently; use a smooth, firm pull.
- Store your mower in a dry place to prevent rust and corrosion on the spring.
- Replace a fraying cord immediately, before it breaks completely.
When To Call A Professional
While this is a DIY-friendly repair, some situations warrant professional help. If the engine’s flywheel or crankshaft is damaged, or if the entire starter assembly is cracked or broken, a repair shop might be the better option. If you’re uncomfortable with the spring tension or the repair seems beyond the steps here, seeking help is a smart choice.
Frequently Asked Questions
How Much Does It Cost To Fix A Lawn Mower Pull Cord?
A replacement pull cord typically costs between $5 and $15. A whole recoil starter assembly, if needed, can range from $20 to $50. Doing the repair yourself saves on labor costs, which can be $50 or more per hour.
Can I Use Any Rope To Replace A Lawn Mower Pull Cord?
No, it is not recommended. Lawn mower pull cord is a specific, durable nylon rope designed to withstand high tension, UV exposure, and repeated pulling. Regular rope will fray and break quickly, potentially causing damage or injury.
Why Does My Pull Cord Keep Breaking?
Frequent breakage can be caused by a frayed or damaged guide hole in the housing, an over-tensioned recoil spring, or using the wrong type of cord. Inspect the entire path of the cord for rough edges that might be wearing it down.
How Do I Know If The Recoil Spring Is Bad?
The main sign is a lack of retraction. If you pull the cord and it does not wind back in automatically, or if it comes out too easily with no resistance, the spring is likely broken or has become disconnected from the pulley.
Is It Hard To Replace A Lawn Mower Starter Assembly?
Replacing the entire assembly is often simpler than repairing individual parts. It usually involves removing a few screws, swapping the old unit for the new one, and reattaching the pull handle. It avoids the need to handle the tensioned spring directly.