A broken pull string halts your mowing progress, but the repair is usually less complex than it seems. Learning how to fix the lawn mower pull string is a straightforward task that can save you time and money. With a few basic tools and some patience, you can have your mower running again in under an hour. This guide will walk you through the entire process, from diagnosis to the final pull.
How To Fix The Lawn Mower Pull String
Before you start taking things apart, it’s crucial to understand what went wrong. The pull start system on a lawn mower is a relatively simple mechanism. When you pull the handle, the cord unwinds from a pulley or recoil assembly, which turns the engine’s crankshaft to start it. The spring inside the recoil housing then retracts the cord back. Common failures include a snapped cord, a cord that won’t retract, or a handle that has come detached.
Tools And Parts You Will Need
Gathering the right materials before you begin will make the job smoother. You likely have most of these items in your garage already.
- Replacement pull cord (check your mower’s manual for thickness and length, or bring the old cord to a hardware store)
- Screwdrivers (flathead and Phillips)
- Socket set or wrenches
- Needle-nose pliers
- A pair of vice grips or locking pliers
- Safety glasses
- Work gloves
Safety First: Preparing Your Mower
Always prioritize safety when working with machinery. A simple mistake can lead to injury.
- Disconnect the Spark Plug: This is the most important step. Locate the spark plug wire and firmly pull it off the plug. This prevents the engine from accidentally starting while your hands are near the blade and recoil system.
- Drain the Fuel (Optional but Recommended): For added safety, especially if you need to tip the mower, consider draining the gas tank or running the engine until it’s dry.
- Clean the Area: Clear away any grass clippings and debris from around the starter assembly to prevent dirt from falling into the engine.
Locating The Recoil Starter Assembly
The pull string mechanism is housed in the recoil starter assembly. On most walk-behind mowers, this is a plastic or metal housing on the top of the engine, often held in place by three or four bolts. On some models, it may be on the side. Refer to your mower’s manual if your unsure of its location.
Step-By-Step Repair Process
Now, let’s get into the detailed steps for fixing the broken pull string. Follow these instructions carefully.
Step 1: Removing The Starter Assembly
- After disconnecting the spark plug, use your socket set or screwdriver to remove the bolts securing the starter housing to the engine.
- Gently lift the entire assembly away. Be cautious, as the recoil spring inside is under tension.
- Place the assembly on a clean, flat work surface with the side facing up that shows the pulley the cord wraps around.
Step 2: Releasing The Old Cord And Spring Tension
- Carefully lift the pulley to see the recoil spring beneath it. Do not let it snap.
- Using your needle-nose pliers, slowly unwind the pulley in the direction opposite of its winding tension until all spring tension is released. The spring should lay flat in its housing.
- Once the spring is relaxed, you can remove the knot or clip holding the old cord’s end on the pulley. Pull the old cord out completely.
Step 3: Installing The New Pull Cord
- Feed one end of your new cord through the hole in the starter housing where the handle will be.
- Tie a secure knot (a figure-eight or double overhand knot works well) on the end of the cord that will sit inside the pulley. Trim any excess cord from the knot.
- Place this knotted end into the notch or anchor point on the pulley. You may need to hold it in place with a finger.
Step 4: Winding The Recoil Spring And Pulley
- Wind the pulley in the direction specified by any arrows or in the direction that tightens the main recoil spring. Usually, this is clockwise. Wind it the number of turns recommended in your manual (often 3-5 full turns).
- While maintaining tension on the pulley, carefully route the cord around the pulley’s groove.
- Slowly let the pulley retract into the housing, allowing the spring to pull it down. The cord should now be wound neatly onto the pulley.
Step 5: Reattaching The Handle And Reassembly
- Thread the free end of the cord through the hole in the pull handle.
- Tie another secure knot and pull it tight against the handle. Trim any excess cord, leaving a small tail.
- Test the retraction by pulling the cord out a few inches and letting go. It should snap back smoothly.
- Finally, reposition the starter assembly back onto the engine and secure it with the bolts. Reconnect the spark plug wire.
Troubleshooting Common Pull String Problems
Sometimes, the issue isn’t just a broken cord. Here are solutions to other frequent problems.
The Cord Pulls But Does Not Retract
This almost always indicates a problem with the recoil spring. The spring may be broken, disconnected, or has lost its tension. You will need to disassemble the starter housing to inspect the spring. If it’s broken, a replacement recoil spring kit is needed. If it’s just slipped off its anchor, you can carefully rehook it while wearing gloves for protection.
The Cord Is Stuck Or Extremely Hard To Pull
A stuck cord can be caused by several issues. First, ensure the engine isn’t seized by trying to turn the blade by hand (with the spark plug disconnected). If the engine turns freely, the problem is likely in the starter mechanism itself. The pulley may be binding, or the cord could be jammed inside the housing. Dismantling the assembly for a thorough cleaning and inspection is the best course of action.
The Handle Broke Off The Cord
This is the simplest fix. You can purchase a universal replacement pull handle at any lawn mower shop or home center. Just untie the old knot on the cord, thread the cord through the new handle, and tie a new, sturdy knot. Make sure the knot is large enough that it cannot pull back through the handle’s hole.
Preventative Maintenance Tips
Taking care of your pull start system can prevent future breakdowns and extend its life. A little maintenance goes a long way.
- Lubricate Periodically: Apply a small amount of light machine oil to the recoil spring and the pulley shaft during your seasonal tune-up. Avoid over-oiling, as it can attract dirt.
- Keep It Clean: Regularly blow out grass clippings and debris from around the starter housing with compressed air.
- Pull Gently: Avoid yanking the cord with excessive force. Use a smooth, steady pull to start the engine.
- Store Properly: Store your mower in a dry place to prevent rust and corrosion on the metal parts of the starter assembly.
When To Call A Professional
While most pull string repairs are DIY-friendly, there are times when seeking professional help is wiser. If you discover a severely damaged starter housing, a broken engine component, or if the engine is seized, a small engine repair shop is your best bet. If you feel uncomfortable handling the tensioned recoil spring, it’s also perfectly reasonable to take the assembly to a pro for them to rewind safely.
Frequently Asked Questions
What is the average cost to fix a lawn mower pull cord?
If you do it yourself, the cost is minimal, usually just the price of a replacement cord and handle, which is often under $10. If you take it to a repair shop, labor will increase the total cost to approximately $50 to $100, depending on your location and the shop’s rates.
Can I use any type of rope as a replacement pull cord?
No, it is not recommended. Lawn mower pull cord is specifically designed to be durable, flexible, and resistant to weather and abrasion. Using improvised rope like paracord or nylon twine can lead to premature breaking and may not handle the recoil tension safely.
How often does a lawn mower pull string need to be replaced?
There’s no set schedule. A pull cord should last for many years with proper use. Replacement is typically only needed if it breaks, frays significantly, or the handle detaches. Preventative maintenance can greatly extend its lifespan.
Why does my pull cord keep breaking?
Frequent breakage can be a sign of a deeper issue. Common causes include a damaged or rough spot inside the starter housing that frays the cord, a misaligned pulley, or a recoil spring that is too tight. Inspect the entire path of the cord for any abrasive surfaces and smooth them out if possible.
Fixing a lawn mower pull string is a highly satisfying repair that restores your equipment’s functionality. By following this guide, you’ve gained the knowledge to tackle this common problem confidently. Remember to always work safely, disconnect the spark plug first, and take your time, especially when handling the recoil spring. With your mower fixed, you can get back to maintaining a perfect lawn.