If your lawn mower’s starter rope has snapped or retracted, learning how to repair pull cord on lawn mower is a straightforward DIY task that can save you time and money. Repairing a pull cord typically involves rewinding the recoil spring mechanism inside the starter housing. With a few common tools and a replacement cord, you can have your mower starting smoothly again in under an hour.
This guide will walk you through the entire process, from diagnosing the problem to the final reassembly. You’ll learn the essential safety steps, the tools you need, and detailed instructions for handling the recoil spring, which is often the trickiest part.
How To Repair Pull Cord On Lawn Mower
The core process for fixing a broken pull cord is consistent across most walk-behind mowers. It involves removing the starter assembly, replacing the cord, and carefully resetting the recoil spring. Before you start, ensure the mower is on a flat, stable surface and the spark plug wire is disconnected to prevent any accidental starts.
Tools And Materials You Will Need
Gathering the right items before you begin makes the job much smoother. You likely have most of these tools already in your garage.
- Replacement pull cord (check your mower’s manual for length and thickness)
- Socket set and screwdrivers (flathead and Phillips)
- Needle-nose pliers
- Safety glasses and work gloves
- A sturdy pair of scissors or a knife
- A small container for loose screws
- Light machine oil or grease
Safety Precautions Before Starting
Your safety is the most important part of any repair. Never skip these critical steps.
- Disconnect the spark plug wire. This ensures the engine cannot start while you are working on it.
- Allow the engine to cool completely if the mower was recently used.
- Work in a well-lit area with plenty of space to lay out parts.
- Wear safety glasses to protect your eyes from springs and small metal parts.
Step-By-Step Repair Instructions
Follow these steps carefully to successfully repair your mower’s pull cord. Take your time, especially when handling the recoil spring.
Step 1: Remove The Starter Assembly
Locate the starter housing on top of the engine. It’s the plastic or metal cover where the pull cord handle is. Use your socket set to remove the bolts or screws holding it in place. There are usually three or four. Gently lift the entire starter assembly off the engine. Be cautious, as the recoil spring inside is under tension.
Step 2: Release The Old Cord And Spring Tension
With the assembly removed, you need to safely release the energy in the recoil spring. Hold the housing firmly on a table. Slowly let the pulley inside rotate, allowing the spring to unwind completely. Once all tension is released, you can remove any remaining pieces of the old cord from the pulley and the handle.
Step 3: Wind The Recoil Spring
This is the most critical step. The spring sits in a channel around the pulley. Using your needle-nose pliers, carefully hook the inner end of the spring onto the anchor post in the center of the housing. Then, turn the pulley in the direction opposite of the pull (usually clockwise) until you feel moderate resistance. This pre-winds the spring, giving it the tension needed to retract the new cord. You may here a slight clicking as it winds.
Step 4: Install The New Pull Cord
Cut your replacement cord to the correct length, leaving a little extra. Feed one end through the hole in the pulley and tie a secure knot, like a double overhand knot. Pull the knot tight so it sits flush in its notch. Then, while holding the pulley to prevent it from spinning, feed the other end of the cord through the exit hole in the starter housing and attach the handle with another strong knot.
Step 5: Reassemble And Test The Starter
Before putting the assembly back on the mower, test it. Gently pull the cord to ensure it extends and retracts smoothly. If it works, reinstall the starter housing onto the engine block, tightening the bolts evenly. Reconnect the spark plug wire. Give the cord a firm pull to start the engine and verify the repair was succesful.
Common Mistakes To Avoid
Being aware of these pitfalls can save you from frustration and having to redo your work.
- Not disconnecting the spark plug. This is a non-negotiable safety hazard.
- Letting the recoil spring fly out uncontrolled. Always wear eye protection and release tension slowly.
- Over-winding or under-winding the recoil spring. Follow the instructions for the correct pre-tension.
- Using a weak knot. The knot must withstand significant force with each pull.
- Overtightening the housing bolts, which can crack the plastic housing.
Troubleshooting Persistent Starter Problems
If you’ve replaced the cord but the starter still isn’t working right, one of these issues could be the cause.
The Cord Does Not Retract
This usually means the recoil spring is not properly engaged or is broken. You will need to reopen the housing and check that the spring’s inner hook is securely on the anchor post. If the spring is broken, you’ll need to replace the entire recoil spring kit.
The Cord Retracts Too Forcefully
An overly aggressive retraction often indicates the recoil spring was wound too tightly during installation. You’ll need to release some tension by unwinding the pulley slightly before securing the cord.
The Pulley Jams Or Grinds
Dirt, debris, or a lack of lubrication can cause the pulley to stick. Clean the inside of the housing and apply a light coat of machine oil to the spring and the pivot point of the pulley. Also check for any visible cracks in the pulley itself.
When To Call A Professional
While this repair is very DIY-friendly, there are times when seeking help is the best choice. If the starter housing or pulley is cracked or damaged, you may need a replacement part. If the engine’s flywheel or other internal components are preventing the cord from pulling, the problem is deeper than the starter assembly. A small engine repair shop can diagnose and fix these more complex issues efficiently.
Maintenance Tips To Prevent Future Issues
A little routine care can extend the life of your pull cord and starter assembly significantly. Regularly clean around the starter housing to prevent grass clippings and dirt from entering. Every few months, apply a silicone spray or light oil to the cord where it exits the housing to reduce friction. Avoid yanking the cord violently; a smooth, steady pull is more effective and less stressful on the components. Finally, store your mower in a dry place to prevent rust and corrosion on the spring.
Frequently Asked Questions
What Kind Of Rope Do You Use For A Lawn Mower Pull Cord?
You should use a dedicated replacement lawn mower starter cord. It is typically made from durable, weather-resistant nylon and is designed to withstand high tension and repeated pulling. Using the wrong type of rope can lead to premature breaking.
Can You Fix A Recoil Starter Without Replacing The Spring?
Yes, if the spring is not broken and has simply become unhooked, you can re-engage it and wind it as part of the cord replacement process. However, if the spring is cracked, kinked, or has lost its tension, it must be replaced for the starter to function correctly.
How Much Does It Cost To Repair A Lawn Mower Pull Cord?
Doing it yourself costs very little, usually just the price of the replacement cord, which is often between $5 and $15. If you take it to a repair shop, labor costs will bring the total to approximately $50 to $80, depending on your location.
Why Does My Pull Cord Keep Breaking?
Frequent breakage can be caused by a few factors. A frayed or damaged exit hole on the starter housing can cut the cord. An improperly wound or damaged recoil spring can create excessive drag. The most common reason is simply normal wear and tear from age and use.
How Tight Should The Recoil Spring Be Wound?
The spring should be pre-wound until you feel a firm, steady resistance—usually after turning the pulley one and a half to two full rotations. This provides enough tension to retract the cord fully without being so tight that it causes rapid wear or makes the cord difficult to pull.