How to fix Lawn Boy 10515 Model(3 Easy Ways)

Lawn Boy is a well-known brand of lawnmowers that has been in business for many years. 

Their lawnmowers are known for their durability and ease of use, but like any piece of machinery, they can experience issues over time. 

One common model that homeowners may experience problems with is the Lawn Boy 10515. 

In this post, we’ll discuss some common issues that you may encounter with Lawn Boy 10515 and provide some possible solutions.

How to fix Lawn Boy 10515 model

How to fix Lawn Boy 10515 model

1. Difficulty starting the engine

One common issue that homeowners may experience with the Lawn Boy 10515 is difficulty starting the engine. 

This can be caused by a variety of factors, such as a dirty air filter, a clogged carburetor, or a weak spark. 

How to Fix

To fix this issue, you can try cleaning or replacing the air filter, cleaning the carburetor, or checking the spark plug and replacing it if necessary.

2. Stalling while in use

Another common problem with the Lawn Boy 10515 is that it may stall while in use. This can be caused by a variety of factors such as a dirty air filter, a clogged fuel filter, or a problem with the carburetor. 

How to Fix

To fix this issue, you can try cleaning or replacing the air filter, cleaning the fuel filter, or checking the carburetor and making any necessary adjustments.

3. Difficulty adjusting the cutting height

A third issue that homeowners may experience with the Lawn Boy 10515 is difficulty adjusting the cutting height. This can be caused by a problem with the adjustment lever or a problem with the linkage. 

How to Fix

To fix this issue, you can try checking the adjustment lever and making sure it is not bent or damaged and then inspect the linkage for any damaged or loose parts, replace or adjust as necessary.

Read Lawn Mower Makes Grinding Noise When Trying to Start(Solved)

4. Lawn mower blades not rotating 

A fourth common problem is the lawn mower blades not rotating while mowing. 

This can be caused by a variety of factors such as a clogged deck, dull or damaged blades, or a problem with the drive belt. 

How to Fix

To fix this issue, you can try cleaning the deck, sharpening or replacing the blades, or checking the drive belt and making any necessary adjustments or replacements.

It’s worth mentioning that it’s always good practice to consult the manufacturer’s manual for the appropriate troubleshooting steps for your specific model.

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IssuePossible CausesSolutions
Difficulty starting engineDirty air filter, clogged carburetor, weak sparkClean or replace air filter, clean carburetor, check spark plug and replace if necessary
Stalling while in useDirty air filter, clogged fuel filter, problem with carburetorClean or replace air filter, clean fuel filter, check carburetor and make any necessary adjustments
Difficulty adjusting cutting heightProblem with adjustment lever, problem with linkageCheck adjustment lever and make sure it’s not bent or damaged, inspect linkage for any damage or loose parts and replace or adjust as necessary
Lawn mower blades not rotatingClogged deck, dull or damaged blades, problem with drive beltClean the deck, sharpen or replace blades, check drive belt and make any necessary adjustments or replacements

Read How to Start Mower After Running Out of Gas(5 Tips)

Why won’t my Lawn Boy start?

Possible CausesSolutions
Not enough fuel or fuel is staleAdd fresh fuel or replace stale fuel
Not enough oil or oil is dirty/contaminatedCheck oil level and add oil or change oil if necessary
Spark plug is dirty or fouledClean or replace spark plug
Air filter is dirty or cloggedClean or replace air filter
Carburetor is dirty or cloggedClean or rebuild carburetor
Battery is low or not chargedCharge battery or replace if necessary, check connections
Choke is not set correctlyCheck the choke setting and adjust it according to the manufacturer’s manual

Maintenance Tips for Lawn Boy 10515 Model

Maintenance TaskDescription
Check oil level and change oilCheck the oil level regularly and change the oil according to the manufacturer’s manual’s recommendations
Check and replace air filterCheck the air filter for dirt and debris and replace it as needed
Keep engine and surrounding area cleanGrass clippings, dirt, and debris can accumulate on the engine and surrounding areas, which can cause damage over time.
Check and drain the fuel filterKeep an eye on the fuel filter and drain water from it if needed
Check and sharpen bladesCheck the blades regularly and sharpen them as needed for proper cutting
Check and adjust tire pressureKeep the tires properly inflated for smooth running
Check the deck and clear any build-upCheck for grass clippings build-up under the deck, remove them, and keep the deck clean to avoid clogging
Store properlyStore the mower in a dry, protected area when not in use.

Read How to Start a Riding Lawn Mower with a Screwdriver(In 5 Steps)

How do I start a lawn boy?

The process of starting a Lawn Boy lawn mower can vary depending on the specific model you have. However, most Lawn Boy models have a similar starting process. 

Here are the general steps you can follow to start a Lawn Boy lawn mower:

  • Make sure the fuel tank is full of fresh gasoline and the oil level is correct as per your manual instructions
  • Set the choke – Depending on your model, you may have a manual or automatic choke.
  • Consult the owner’s manual to know how to properly set the choke.
  • Set the throttle – Most Lawn Boy models have a throttle that controls the speed of the engine.
  • Make sure it is set to the “Start” or “Choke” position.
  • Place the lawn mower in a clear area and make sure the blades are disengaged.
  • Pull the starter cord – Most Lawn Boy models have a starter cord that you need to pull to start the engine. 
  • Pull the cord firmly, but do not yank it. Repeat this process a few times if the engine does not start.
  • Once the engine starts, wait for a few seconds and release the choke if the manual, let the automatic choke work if you have an automatic choke
  • Gradually adjust the throttle to the desired speed and engage the blades if you are ready to mow.

Lawn Boy Mower Won’t Start

1. Check the fuel.

Ensure that there is enough fuel in the tank. If it’s low, fill it up with fresh gasoline. Also, check if the fuel valve is open if your mower has one.

2. Check the spark plug.

Remove the spark plug and inspect it for signs of damage or fouling. Clean or replace the spark plug if necessary.

3. Clean the air filter.

A dirty or clogged air filter can prevent the mower from starting. Remove the air filter and clean or replace it as needed.

4. Check the oil level.

Make sure the oil level in your mower is sufficient. Low oil levels can trigger safety mechanisms that prevent the engine from starting.

5. Check the safety features.

Ensure that the safety features, such as the kill switch and the blade engagement lever, are in the correct positions.

6. Prime the engine.

If your mower has a primer bulb, press it several times to prime the engine before starting.

7. Check the battery (if applicable).

If your Lawn Boy mower has an electric start feature, make sure the battery is charged. If the battery is dead or low, you may need to recharge or replace it.

8. Consult the owner’s manual.

Refer to the manufacturer’s instructions for specific troubleshooting steps and maintenance procedures for your particular model of Lawn Boy mower.

Read 11 Common Gravely Mower Electrical Problems(With Solutions)

Final Remarks

The Lawn Boy 10515 is a reliable lawn mower, but like any piece of machinery, it can experience issues over time. 

By understanding some of the common problems that homeowners may experience with this model, you can take the necessary steps to fix them. 

Regular maintenance, such as cleaning the air filter and replacing the spark plug, can help prevent many of these issues from occurring in the first place. 

If you’re unable to fix the problem yourself, you may need to take the lawn mower to a professional for repairs.

Read Riding Mower Making Noise When Blades Are Engaged(Fixed)


My Lawn Boy 10515 mower won’t start. What should I do?

If your mower won’t start, start by checking the fuel level and ensuring the fuel valve is open.

Inspect the spark plug for damage and clean or replace it if needed. Clean the air filter and check the oil level. Also, make sure the safety features are in the correct positions, and try priming the engine if applicable.

How can I adjust the cutting height on my Lawn Boy 10515 mower?

To adjust the cutting height, locate the cutting height adjustment lever or knob on your mower.

Move it to the desired height setting, usually indicated by numbers or symbols. Ensure that both sides of the mower deck are set at the same height for an even cut.

My Lawn Boy 10515 mower is not cutting the grass evenly. What could be the problem?

Uneven cutting can result from several issues. Check the blade for damage or dullness, and sharpen or replace it if necessary. Ensure that the blade is securely attached to the mower.

Adjust the cutting height to a proper setting and make sure the mower deck is level. Uneven terrain can also affect cutting performance.

How often should I change the oil in my Lawn Boy 10515 mower?

It’s generally recommended to change the oil in your mower after every 25 hours of operation, or at least once a year.

Refer to the owner’s manual for specific instructions on the type of oil to use and the proper oil change procedure for your model.

My Lawn Boy 10515 mower is vibrating excessively during operation. What should I do?

An unbalanced blade, a loose or damaged blade adapter, or a bent mower blade can all cause excessive vibration.

Check the blade for balance and replace it if necessary. Inspect the blade adapter for tightness and replace it if damaged.

If the blade is bent, replace it with a new one. If the issue persists, it’s advisable to seek professional assistance.

George Bill
George Bill

George Bill is a Mechanical Engineer by Profession and an avid gardener and has been mowing his lawn for over 20 years. He has used a variety of different mowers during this time.
George is an expert at maintaining his mowers and over the years, he has learned many tricks and techniques for getting the best results from his mowers and is always happy to share his knowledge on this site.