When your lawn mower won’t start, knowing how to fix cord on lawn mower is an essential skill. That sudden snap or frustrating lack of tension means the starter rope has broken or come loose, but the repair is often straightforward. When the starter cord on your lawn mower fails, the repair often involves rewinding a new rope onto the pulley. With a few common tools and a bit of patience, you can have your mower running again and save a costly trip to the repair shop.
This guide will walk you through the entire process, from diagnosis to the final pull. We’ll cover safety, the tools you need, and detailed steps for the most common types of recoil starters.
How To Fix Cord On Lawn Mower
Fixing a broken pull cord is a manageable DIY task. The core principle is the same for most walk-behind mowers: you must access the recoil starter assembly, remove the old rope, and carefully wind a new one onto a spring-loaded pulley. Rushing can lead to frustration or injury, so taking it step-by-step is key.
Safety First: Essential Precautions
Before you touch any tools, your safety is the top priority. A lawn mower’s recoil spring is under high tension and can cause serious injury if released uncontrolled.
- Disconnect the Spark Plug: Always remove the spark plug wire from the plug. This ensures the engine cannot accidentally start while your hands are near the blade.
- Wear Safety Gloves: Thick work gloves protect your hands from sharp metal edges and the cord itself.
- Work on a Clean, Flat Surface: A sturdy workbench or table is ideal. Avoid working on the grass where small parts can be lost.
- Contain the Recoil Spring: The spring is housed in the starter assembly. Be mindful that it is under tension and should be handled with care during disassembly.
Tools And Parts You Will Need
Gathering everything before you start makes the job smoother. You likely have most of these items already.
- Replacement Starter Rope: Check your mower’s manual for the correct diameter and length. Common sizes are 3/32″ or 1/8″ in diameter and about 4-5 feet long.
- Socket Set and Screwdrivers: For removing the starter assembly cover (often held by 3-4 bolts).
- Needle-Nose Pliers and a Small Awl or Ice Pick: For threading the new rope and holding mechanisms.
- Lighter or Matches: To melt the ends of the nylon rope to prevent fraying.
- A Clamp or Vice: Helpful to secure the starter housing while you work.
- Safety Glasses: To protect your eyes from debris.
Step-By-Step Repair Guide
Follow these steps carefully. If you get stuck, take a break and review the instructions.
Step 1: Access the Recoil Starter Assembly
First, disconnect the spark plug wire. Then, locate the starter cover on the top of your mower’s engine. It’s the plastic or metal casing where the pull handle is. Use your socket set to remove the bolts holding it down. Sometimes these bolts also hold a metal shroud; you may need to remove that as well. Gently lift the starter assembly off the engine. You might here a slight click as it comes free.
Step 2: Release Tension and Remove the Old Rope
With the assembly in your hands, you’ll see the pulley and the remaining old rope. Slowly let the pulley unwind until all spring tension is gone. You may need to hold the pulley and gently release it turn by turn. Once all tension is released, use needle-nose pliers to pull the knot of the old rope out of the notch in the pulley. Discard the old rope.
Step 3: Prepare the New Starter Rope
Cut your new rope to the length of the old one, or as specified in your manual. Use a lighter to carefully melt and fuse each end of the rope. This creates a hard, tapered end that is easier to thread and won’t fray. Make one end especially neat, as this will be the end that knots inside the pull handle.
Step 4: Wind the Recoil Spring
This is the most delicate part. The spring needs to be pre-wound to provide retraction power. Turn the pulley in the direction opposite of its normal pulling rotation (usually clockwise) until you feel resistance. Then, turn it slightly more—typically 1 to 1.5 full turns—and carefully hold it in place. Some assemblies have a slot or hole where you can insert a screwdriver or awl to lock the pulley in this tensioned position.
Step 5: Thread and Knot the New Rope
With the spring under tension and the pulley locked, thread the un-melted end of your new rope through the exit hole in the starter housing and then through the hole in the pulley. Tie a secure knot, like a figure-eight or double overhand knot, on the side of the pulley that will sit inward. Trim any excess, but leave enough so the knot cannot slip back through the hole. Slowly release the pulley lock, allowing the rope to be pulled into the housing until the knot seats against the pulley.
Step 6: Attach the Pull Handle and Test
Thread the other end of the rope through the hole in your pull handle. Tie another secure knot, melt the end slightly to lock it, and trim. Before reassembling, give the cord a few gentle pulls to ensure it retracts smoothly. If it does, reattach the starter assembly to the engine with the bolts. Finally, reconnect the spark plug wire. Your mower should now be ready for a test start.
Common Problems And Troubleshooting
Even with careful work, you might encounter a minor issue. Here’s how to solve common problems.
The Cord Does Not Retract
This usually means the recoil spring was not wound with enough tension, or it slipped during assembly. You will need to disassemble again and repeat Step 4, ensuring you apply the correct number of pre-winding turns.
The Cord Retracts Too Forcefully or Jerkily
This indicates the spring may have been overwound or is catching. Disassemble with caution, release all tension, and rewind it carefully. Ensure the spring is seated correctly in its housing and hasn’t become dislodged.
The Knot Slips or the Cord Frays Quickly
Always melt the ends of nylon rope. If a knot slips, you did not tie it tightly enough or trimmed it too short. Use a more reliable knot and leave a slightly longer tail after melting.
Preventive Maintenance Tips
A little care can prevent future cord breaks and extend the life of your starter mechanism.
- Pull Straight: Always pull the starter cord straight out. Angled pulls cause uneven wear on the rope and the pulley.
- Avoid Yanking: Use a smooth, firm motion. Jerking the cord puts sudden stress on the rope and the spring.
- Lubricate Periodically: Once a season, consider applying a small amount of dry lubricant or powdered graphite into the recoil assembly to keep things moving smoothly.
- Clean the Housing: When you change the oil or sharpen the blade, quickly blow out any grass clippings or debris from around the starter area.
When To Call A Professional
While this repair is very doable, there are times when seeking help is the best choice.
- A Broken or Damaged Recoil Spring: If the spring itself is snapped or mangled, replacing it is more complex and hazardous. A professional can do it safely.
- Stripped Bolt Heads or Damaged Housing: If the assembly casing is cracked or the bolts won’t come out, a repair shop has the tools to fix or replace the entire unit.
- Lack of Confidence: If you feel unsure at any point, there’s no shame in taking the mower to a technician. Your safety is worth the cost.
Frequently Asked Questions
How Do You Restring A Lawn Mower Pull Cord?
Restringing a lawn mower pull cord is the same process as fixing a broken one. You must access the recoil assembly, release the spring tension, remove the old rope, pre-wind the spring, and thread and knot the new cord. The key steps are winding the spring correctly and securing the knots properly.
Can I Use Any Rope To Replace My Lawn Mower Starter Cord?
No, you should use specifically designed nylon starter rope. It is durable, flexible, and resistant to the elements and friction. Using the wrong type of rope, like paracord or cotton, can lead to rapid fraying, breaking, or even damage to the pulley mechanism.
Why Does My Lawn Mower Cord Keep Breaking?
Frequent breaks are often caused by a damaged or rough spot on the pulley or the exit hole in the housing, which acts like a saw on the rope. Inspect these areas for burrs or cracks and smooth them with a file if needed. Also, ensure you are pulling the cord straight and not yanking it.
How Much Does It Cost To Fix A Pull Start On A Lawn Mower?
If you do it yourself, the cost is just for the replacement rope, usually between $5 and $10. If you take it to a small engine repair shop, the total cost for labor and parts typically ranges from $50 to $100, depending on your location and the mower model.
Is It Hard To Replace A Recoil Starter Spring?
Replacing the recoil spring itself is considered a more advanced repair due to the high tension involved. The spring is tightly coiled and can fly out dangerously if not handled correctly. For most DIYers, replacing the entire starter assembly (which comes pre-wound) is a safer and easier option than trying to replace just the spring.
Fixing a lawn mower pull cord is a satisfying repair that restores function to your essential garden tool. By following these steps, prioritizing safety, and taking your time, you can confidently solve this common problem. Remember to always disconnect the spark plug first, wind the spring with care, and test the mechanism before final reassembly. With this knowledge, you’ll be prepared the next time you hear that disappointing snap.