When the starter rope on your mower breaks, learning how to replace the lawn mower pull cord is an essential repair. Replacing the cord restores easy starting with a few tools and saves you a costly trip to the repair shop.
This task might seem intimidating, but it’s a straightforward process. With basic tools and a new pull cord, you can have your mower starting smoothly again in under an hour.
This guide will walk you through every step. We’ll cover the tools you need, safety precautions, and detailed instructions for common mower types.
How To Replace The Lawn Mower Pull Cord
The core process for replacing a pull cord is similar across most walk-behind mowers. The key is working carefully and keeping track of all the small parts. Always refer to your mower’s manual for specific diagrams if available.
Tools And Materials You Will Need
Gathering the right items before you start makes the job go much smoother. You likely have most of these tools already in your garage.
- A replacement pull cord (check your mower’s model number for the correct length and thickness)
- Socket set or wrenches
- Screwdrivers (flathead and Phillips)
- Needle-nose pliers
- A pair of sturdy gloves
- Safety glasses
- A clean workspace
Important Safety Precautions
Safety must come first. A lawn mower engine contains powerful springs that can cause serious injury if released unexpectedly.
- Disconnect the spark plug wire. This is the most critical step to prevent the engine from accidentally starting.
- Allow the engine to cool completely if the mower was recently used.
- Wear safety glasses to protect your eyes from dirt, grease, and small parts.
- Work on a flat, stable surface where parts won’t get lost.
- Be mindful of the recoil spring inside the starter assembly. It is under tension.
Step-By-Step Replacement Guide
Follow these steps carefully. Taking pictures with your phone before disassembly can be a huge help for reassembly.
Step 1: Access The Recoil Starter Assembly
First, you need to remove the starter assembly from the mower engine. This usually involves removing a few bolts or screws.
- Locate the bolts or screws holding the plastic starter housing to the engine. These are typically around the perimeter.
- Use the appropriate socket or screwdriver to remove them. Place them in a small container so they don’t get lost.
- Gently lift the entire starter assembly away from the engine. There may be a locating tab, so wiggle it slightly if it feels stuck.
- Set the assembly on your workbench with the pulley facing up.
Step 2: Remove The Old Pull Cord
Now you will release the old, broken cord from the pulley and spring mechanism.
- Slowly let out any remaining cord from the pulley. You may need to turn the pulley counter-clockwise to release tension.
- Locate the knot or clip where the cord is attached to the pulley. You might need to remove a cover or retaining washer to see it.
- Untie the knot or release the clip and pull the old cord out of the housing. Note how it was routed through the exit hole.
- If the cord is broken and the end is retracted, you’ll need to carefully lift the pulley to retrieve the knotted end from the spring hub.
Step 3: Wind The Recoil Spring (If Needed)
Sometimes when the cord breaks, the recoil spring loses its tension. If the pulley spins freely with no resistance, the spring needs to be rewound.
- Lift the pulley carefully out of the housing. The spring is underneath it.
- Wear gloves and use pliers to carefully re-engage the spring’s outer hook into the notch in the housing.
- Turn the pulley slowly clockwise until you feel moderate tension. Do not overwind it. Usually, 1-2 full turns is sufficient.
- Realign the pulley so the cord anchor hole is lined up with the cord exit hole in the housing.
Step 4: Install The New Pull Cord
This is the main part of the repair. Patience is key to getting the knot secure and the length correct.
- Feed one end of the new cord through the exit hole in the starter housing from the outside.
- Pull the cord through and tie a secure, large knot at the end. A figure-eight knot or double overhand knot works well.
- Route the cord around the pulley’s guide and seat the knot into its anchor slot on the pulley.
- Wind the pulley clockwise (the direction opposite of pulling) to wrap the new cord onto the spool. Keep the cord taut as you wind.
- Leave about 6 to 8 inches of cord hanging out of the exit hole. This will become your new handle length.
Step 5: Reattach The Handle And Test Tension
With the cord installed, you need to attach the handle and ensure the recoil action works properly.
- Thread the free end of the cord through your handle and tie another secure knot.
- Gently pull the cord out a few inches to engage the pulley with the spring. You should feel smooth resistance and the cord should retract when released.
- If the cord does not retract, the spring may not be engaged. If it retracts too forcefully, you may have wound it to tightly.
- Pull the cord all the way out to check for smooth operation and full retraction. Make any adjustments now.
Step 6: Reinstall The Starter Assembly
Once the cord is working perfectly on the bench, you can put everything back on the mower.
- Carefully align the starter assembly back onto the engine shaft. Make sure any locating tabs or slots are lined up.
- Reinstall and tighten all the bolts or screws you removed earlier. Do not overtighten the screws on plastic housing.
- Reconnect the spark plug wire.
- Give the pull cord a final test start. It should pull smoothly and the engine should turn over.
Common Problems And Troubleshooting
Sometimes, things don’t go perfectly on the first try. Here are solutions to frequent issues.
The Cord Retracts Too Fast Or Too Slow
This is usually a spring tension issue. If it’s too fast, the spring is overwound. If it’s too slow or sluggish, the spring may be worn out or need more tension. You may need to remove the assembly and adjust the spring windings slightly.
The New Cord Keeps Breaking Or Fraying
Check the cord exit hole for sharp edges or burrs. Smooth it with a file or sandpaper if needed. Also, ensure you are using the correct thickness and type of cord specified for your mower. A cheap cord may not hold up.
The Pulley Does Not Engage The Engine
If you pull the cord and the engine doesn’t turn, the pulley dogs or engagement tabs may not be extending. This could be due to grease, dirt, or worn parts. The starter assembly may need a deeper cleaning or replacement of internal components.
Maintenance Tips To Prevent Future Breaks
A little care can extend the life of your new pull cord significantly. Follow these simple habbits.
- Always pull the cord straight out. Angled pulls cause extra friction and wear.
- Don’t yank the cord violently. Use a smooth, steady motion to start the engine.
- Keep the cord and starter housing clean from grass clippings and debris.
- Occasionally apply a small amount of silicone spray to the cord where it exits the housing to reduce friction.
- Store your mower in a dry place to prevent the cord from degrading.
Frequently Asked Questions
Here are answers to some common questions about lawn mower pull cord replacement.
How Much Does It Cost To Replace A Lawn Mower Pull Cord?
A replacement pull cord typically costs between $5 and $15. Doing the repair yourself saves on labor, which a shop might charge $50 or more for. It’s a very cost-effective DIY fix.
Can I Use Any Rope As A Replacement Pull Cord?
No, you should not. Lawn mower pull cord is specifically designed to be flexible, durable, and resistant to weather and abrasion. Using a generic rope like paracord can lead to quick fraying, breaking, and potential safety issues.
How Do I Know What Length Of Cord To Buy?
The best way is to check your owner’s manual or look up the part using your mower’s model number. If that’s not possible, measure the old cord if you have it, or measure the distance from the starter housing to the handle at full extension and add a few inches for knots.
Why Does My Pull Cord Keep Getting Stuck?
A sticking cord is often caused by a damaged or misaligned recoil spring, a frayed cord jamming inside, or damaged pulley mechanisms. It may require disassembly, a thorough cleaning, and inspection of all internal parts for wear.
Is It Hard To Replace A Recoil Spring?
Replacing the recoil spring is more challenging than just the cord. The spring is under tension and can fly out if not handled carefully. If you’re not comfortable, it may be best to replace the entire starter assembly as a unit, which is often simpler.