A frayed pull cord can leave your mower silent, but learning how to replace lawn mower pull cord is a straightforward repair you can complete in about thirty minutes. You do not need advanced mechanical skills, just a few basic tools and a bit of patience. This guide will walk you through the entire process, from safely accessing the recoil starter to winding the new spring.
Replacing the cord yourself saves money and gets your lawn back on schedule quickly. We will cover every step in clear detail, including the tools you need and common mistakes to avoid. Let’s get your mower starting smoothly again.
How To Replace Lawn Mower Pull Cord
The core process involves removing the starter assembly, installing a new cord, and carefully reassembling everything. While designs vary slightly between mower brands like Briggs & Stratton, Honda, or Toro, the fundamental steps are universal. Always prioritize safety by disconnecting the spark plug before beginning any work.
Tools And Parts You Will Need
Gathering the right items before you start makes the job faster and easier. You likely have most of these tools already in your garage.
- Replacement Pull Cord (Check your mower’s model number for the correct length and thickness)
- Socket Set and Wrenches (Common sizes are 1/2″, 3/8″, and 10mm)
- Needle-Nose Pliers
- Phillips and Flat-Head Screwdrivers
- Safety Glasses
- Work Gloves (To protect your hands from sharp edges and the recoil spring)
- A Pair of Scissors or a Sharp Knife
- A Lighter or Matches (For melting the ends of the new cord to prevent fraying)
Safety First: Preparing Your Mower
Never skip these initial safety steps. A mower engine can kick over unexpectedly if the spark plug is connected, leading to serious injury.
- Disconnect the Spark Plug Wire. Pull the boot off the spark plug and secure the wire away from the plug. This ensures the engine cannot start accidentally.
- Drain the Fuel or Run the Tank Dry. This prevents gasoline spills while you tip the mower on its side. Consult your manual for the best method for your model.
- Clean the Area. Wipe grass and debris from around the starter assembly to prevent dirt from falling into the engine during disassembly.
- Position the Mower. Place it on a flat, stable surface with the starter assembly facing up for easy access.
Locating the Recoil Starter Assembly
The pull cord handle is attached to the recoil starter, which is usually housed under a plastic or metal cover on the top of the engine. This cover is held in place by three to five screws. Remove these screws carefully and set them aside in a small container so they don’t get lost.
Step-by-Step Removal Of The Old Pull Cord
Now, we will carefully take apart the starter to remove the broken cord. Work methodically and pay attention to how the parts come apart.
Step 1: Access the Recoil Mechanism
- Remove the starter cover screws and lift the cover off.
- Inside, you will see the pulley around which the cord is wound. The cord is knotted through a hole in the pulley.
- The pulley is held under tension by a recoil spring. Do not let the pulley spin freely as you release this tension.
Step 2: Release the Recoil Spring Tension
This is the most critical step. The spring is under significant tension. You must control its release.
- Wearing your gloves, firmly grip the pulley with one hand to prevent it from spinning.
- With your other hand, use needle-nose pliers to carefully unwind the knot securing the old, broken cord to the pulley. You may need to cut the knot if it is seized.
- Slowly allow the pulley to rotate in the direction it wants to go (usually counter-clockwise) until all spring tension is released. Let it turn until it stops moving. The spring is now relaxed.
Step 3: Remove the Old Cord and Handle
Once the spring is relaxed, you can completly remove the old components.
- Pull the remaining piece of old cord out of the hole in the pulley.
- Feed the cord back through the guide hole on the starter housing.
- Detach the cord from the pull handle by prying open the metal or plastic clamp that holds it. Save the handle if it is in good condition; you can reuse it with the new cord.
Installing The New Lawn Mower Pull Cord
With the old cord out, you are ready to install the replacement. Using the correct length of cord is vital for proper operation.
Step 1: Prepare the New Cord
- Cut your new nylon cord to the length specified for your mower model. If unsure, a common length is about 36 to 48 inches.
- Use a lighter to carefully melt and fuse each end of the cut cord. This creates a hard, tapered end that will not fray and makes threading much easier.
- Attach one end to the pull handle using the same method the old one used, typically by feeding it through and knotting it securely.
Step 2: Thread the Cord and Wind the Spring
This step requires a bit of coordination. The goal is to wind the recoil spring just enough to create proper retraction.
- Feed the unknotted end of the new cord through the guide hole on the starter housing, from the outside in.
- Then, thread this end through the anchor hole in the pulley. Tie a secure knot, such as a double overhand knot, on the underside of the pulley. Trim any excess cord, leaving about half an inch.
- Now, wind the pulley. Rotate the pulley in the direction *opposite* of the cord’s pull direction (usually clockwise) for the number of turns recommended in your manual, often 3 to 4 full turns. This pre-winds the recoil spring.
Step 3: Engage the Pulley and Test the Retraction
Before putting the cover back on, you need to ensure the mechanism works.
- While holding tension on the pulley to prevent it from unwinding, carefully pull the cord out of the housing until the knot seats against the pulley.
- Slowly release the pulley, allowing the spring to pull the cord back into the housing. The cord should retract smoothly. If it does not retract fully or feels sluggish, you may need to wind the spring one more turn.
- Pull the cord out slowly a few times to test the action. It should extend and retract cleanly without catching.
Reassembling The Starter Assembly
Once the cord retracts correctly, you can put everything back together.
- Ensure the cord is fully retracted and the handle is resting against the housing.
- Align the starter cover properly over the pulley and housing.
- Replace and tighten all screws securely, but do not overtighten, especially on plastic housings.
- Give the pull handle a few firm, full pulls to ensure the engine turns over and the cord retracts reliably every time.
Final Safety Check And Testing
You’re almost done. Just a few final steps before you mow.
- Reconnect the spark plug wire firmly onto the spark plug.
- Refill the fuel tank if you drained it.
- Start the mower as you normally would. The cord should pull with consistent resistance and snap back quickly. Listen for a smooth engine start.
If the engine starts easily, congratulations! You have successfully replaced the pull cord. If the cord feels rough or the engine doesn’t turn, double-check that the cord is not pinched and that the spring is wound correctly.
Common Mistakes And Troubleshooting
Even with careful work, a few issues can pop up. Here’s how to fix them.
The Cord Does Not Retract
This usually means the recoil spring is not wound enough or has become disengaged from its anchor. You will need to reopen the housing and check that the spring is seated in its track and that you applied sufficient pre-wind turns to the pulley.
The Cord Retracts Too Forcefully or Jerkily
This indicates the spring may be overwound. Release tension and try winding it with one fewer turn. An overwound spring can also break prematurely.
The New Cord Frays Quickly
If you did not melt the ends, they will fray. Also, check the guide hole on the housing for any sharp burrs or rough edges. A small file or sandpaper can smooth these out.
The Pulley Spins Freely With No Tension
The recoil spring may have popped out of its housing or broken. This requires inspecting the spring and potentially replacing the entire recoil starter assembly if the spring is damaged.
FAQ: Lawn Mower Pull Cord Replacement
How Much Does It Cost to Replace a Lawn Mower Pull Cord?
A replacement pull cord kit typically costs between $8 and $15. This is significantly less than a professional repair, which can cost $50 to $100 including labor. If the entire recoil starter assembly is damaged, the part cost may range from $20 to $40.
Can I Use Any Rope to Replace a Lawn Mower Pull Cord?
No, you should use specifically designed nylon lawn mower starter cord. It is engineered to withstand high tension, UV exposure, and repeated pulling. Regular rope can fray quickly, break, or not grip the pulley correctly, leading to failure and potential safety issues.
How Do I Find the Right Replacement Cord for My Mower Model?
Locate the model number sticker on your mower’s engine or deck. You can then search for “pull cord for [your model number]” online or take the number to a lawn mower repair shop or hardware store. They can match the exact diameter and length you need.
Why Did My Pull Cord Break in the First Place?
Common causes include normal wear and tear from age, yanking the cord at an angle, a frayed cord that wasn’t replaced soon enough, or an engine that is hard to start due to other maintenance issues like a dirty air filter or old spark plug.
Is It Hard to Replace a Recoil Spring?
Replacing just the recoil spring is a more advanced repair due to the high tension and careful alignment required. For most DIYers, if the spring is broken, it is often more practical and safer to replace the entire recoil starter assembly as a single unit, which simplifies the process.
Replacing a lawn mower pull cord is a very manageable task that restores your equipment’s functionality. By following these steps, you can avoid the cost of a mechanic and gain the satisfaction of a DIY fix. Remember to always put safety first by disconnecting the spark plug, and take your time with the spring tension. With your new cord installed, your mower will be ready for the next cut.