Craftsman 110 Mower Wont Start

Craftsman 110 Mower Won’t Start: Comprehensive Troubleshooting Guide

Is your Craftsman 110 mower refusing to start? Whether you’re dealing with a Craftsman T110 that cranks but won’t start or a Craftsman M110 that starts then dies, this comprehensive troubleshooting guide will help you identify and fix the problem.

Craftsman 110 series mowers are popular for their reliability, but like any mechanical equipment, they can encounter starting issues due to various factors.

In this article, we’ll explore the most common reasons your Craftsman 110 mower won’t start and provide step-by-step solutions to get your lawn care routine back on track.

Quick Takeaway

Check the fuel quality and level before troubleshooting other components
Ensure your battery is charged and connections are clean and tight
Inspect spark plugs for signs of wear or damage
Clean or replace the air filter if it’s clogged
Verify the fuel solenoid and safety switches are functioning correctly

In a nutshell: When your Craftsman 110 mower won’t start, the issue typically stems from fuel problems, battery issues, spark plug failures, clogged air filters, or faulty safety switches. Following our systematic troubleshooting approach will help you identify and resolve the specific problem affecting your mower.

Common Reasons Why a Craftsman 110 Mower Won’t Start

When your Craftsman 110 lawn mower refuses to start, it can quickly derail your lawn maintenance schedule. Understanding the potential causes is the first step toward resolving the issue. The Craftsman 110 series includes both riding mowers (T110) and push mowers (M110), and while they share some common issues, each has unique considerations.

Fuel System Problems

Fuel-related issues are among the most common reasons why a Craftsman 110 mower won’t start. If your mower has been sitting unused for an extended period, the fuel might have deteriorated or become contaminated.

Stale or contaminated fuel: Gasoline can degrade within 30 days, leading to starting problems. If your mower has been sitting with fuel for more than a month, consider draining the tank and refilling with fresh gasoline.
Empty fuel tank: While this might seem obvious, always verify you have enough fuel in the tank before troubleshooting more complex issues.
Clogged fuel filter: A blocked fuel filter restricts gasoline flow to the engine. Check your filter and replace it if it appears dirty or clogged.
Carburetor issues: The Craftsman M110 carburetor can become clogged with old fuel residue, preventing proper fuel-air mixture. Clean the carburetor or consider a replacement if cleaning doesn’t resolve the issue.

If your Craftsman M110 starts then dies, fuel delivery problems are often the culprit. The momentary start indicates that initial combustion is occurring, but something is preventing sustained operation—typically related to consistent fuel flow.

Battery and Electrical Issues

For the Craftsman T110 riding mower, electrical problems often manifest as the mower cranking but not starting. The most common electrical issues include:

Dead or weak battery: If your Craftsman T110 shows no signs of life when you turn the key, a Craftsman T110 battery replacement might be necessary. Batteries typically last 2-3 years before needing replacement.
Loose or corroded battery connections: Even with a good battery, poor connections can prevent proper electrical flow. Clean the terminals and ensure tight connections.
Faulty ignition switch: When you turn the key and nothing happens, the ignition switch might be defective.
Blown fuses: Check and replace any blown fuses in the electrical system.
Damaged wiring: Inspect the wiring harness for any signs of damage, especially from rodents who may have chewed through wires.

Spark Plug Problems

The spark plug is crucial for igniting the fuel-air mixture in your mower’s engine. When the CRAFTSMAN T110 spark plug fails, the engine won’t start despite cranking.

Fouled or dirty spark plug: Carbon deposits or oil can prevent proper sparking. Clean the spark plug or replace it if heavily fouled.
Incorrect gap: The spark plug gap must be set correctly according to your mower’s specifications, usually found in the Craftsman T110 manual.
Worn-out spark plug: Spark plugs don’t last forever. Replace yours if it shows signs of wear or has been in use for more than a season.
Loose connection: Ensure the spark plug wire is securely connected to the spark plug.

Air Filter Issues

A clean air filter is essential for proper engine combustion. When the air filter becomes clogged, the engine receives insufficient air, creating an imbalanced fuel-air mixture.

Clogged air filter: Inspect your air filter and clean or replace it if it’s dirty. A clean filter is crucial for proper engine performance.
Improperly installed filter: Make sure the air filter is correctly seated in its housing.
Missing filter: Never run your mower without an air filter, as this can lead to engine damage.

Troubleshooting a Craftsman T110 That Cranks But Won’t Start

If your Craftsman T110 cranks but won’t start, the engine is receiving power from the battery but failing to initiate combustion. Follow these systematic troubleshooting steps:

Check the Fuel System

Verify fuel level: Ensure there’s fresh gasoline in the tank.
Inspect the fuel cap: A clogged vent in the fuel cap can create a vacuum, preventing fuel flow.
Locate and check the fuel filter: Replace if clogged.
Examine the Craftsman T110 fuel solenoid: This component controls fuel flow to the carburetor and can fail electronically while appearing physically intact.

The fuel solenoid is particularly important in the starting process. When your mower is turned on, the solenoid should receive electrical power, opening to allow fuel flow. A faulty solenoid can prevent fuel from reaching the engine despite everything else functioning correctly.

Spark Plug Inspection

Disconnect the spark plug wire: Always prioritize safety by removing the spark plug wire before handling the plug.
Remove the spark plug: Use the appropriate socket wrench.
Inspect for damage or deposits: Look for signs of oil fouling, carbon buildup, or electrode damage.
Check the gap: Use a gap tool to verify the correct spacing between electrodes.
Test for spark: With the plug connected to its wire (but not installed in the engine), ground the plug against the engine block and have someone turn the key. You should see a visible spark.

Safety Switch Verification

Craftsman T110 riding mowers have multiple safety switches that can prevent starting if not engaged properly:

Seat safety switch: Ensures the rider is properly seated.
Brake safety switch: Verifies the brake is engaged before starting.
PTO (Power Take-Off) switch: Confirms the blade engagement system is disengaged.
Neutral safety switch: Makes sure the transmission is in neutral.

If any of these switches are faulty or improperly adjusted, your mower won’t start even if everything else is working correctly. Sometimes, you can temporarily bypass these switches for testing purposes, but we recommend restoring them for safety reasons once testing is complete.

Fuel Solenoid Troubleshooting

The Craftsman T110 solenoid location is typically on or near the carburetor. To test it:

Listen for a clicking sound when you turn the key to the “On” position.
Check for voltage at the solenoid terminals when the key is on.
If the solenoid receives power but doesn’t click, it likely needs replacement.
If no power reaches the solenoid, trace the electrical circuit for breaks or faults.

Addressing Craftsman M110 Starting Problems

Push mowers like the Craftsman M110 have simpler systems than riding mowers but can still experience starting difficulties. If your Craftsman M110 starts then dies, follow these troubleshooting steps:

Carburetor Issues

The carburetor mixes air and fuel in the proper ratio for combustion. Problems with the carburetor often result in the mower starting briefly before stalling:

Remove the air filter to access the carburetor.
Clean the carburetor using carburetor cleaner spray, paying special attention to the small jets and passages.
Check the float and needle valve to ensure they move freely and seal properly.
Inspect the gaskets for damage that could cause air leaks.

If cleaning doesn’t solve the problem, a carburetor rebuild kit or replacement may be necessary.

Fuel Tank and Lines

Drain old fuel and replace with fresh gasoline.
Add fuel stabilizer if you plan to store the mower for extended periods.
Check fuel lines for cracks or blockages that could restrict flow.
Clean the fuel tank if you notice debris or water contamination.

Air Filter Maintenance

The air filter on your Craftsman M110 requires regular maintenance:

Locate the air filter housing on the side of the engine.
Remove the cover and take out the filter.
Clean foam filters with soap and water, allowing them to dry completely before reinstalling.
Replace paper filters rather than attempting to clean them.
Check for proper installation when replacing the filter and cover.

Seasonal Starting Issues with Craftsman 110 Mowers

Many Craftsman 110 mower starting problems occur seasonally, especially after winter storage or during the first few uses of spring.

After Winter Storage

If your lawn mower won’t start after winter, follow these steps:

Replace old fuel with fresh gasoline.
Change the oil if you didn’t do so before storage.
Replace the spark plug as preventative maintenance.
Clean or replace the air filter.
Check the battery on riding models, as batteries can lose charge during storage.
Lubricate moving parts that may have stiffened during storage.

After Rain or High Humidity

If your lawn mower won’t start after rain, moisture may have affected critical components:

Dry the spark plug and check for water in the spark plug well.
Inspect the air filter for moisture saturation.
Check for water in the fuel by draining a small amount and looking for separation.
Allow thorough drying before attempting to start the mower again.

Preventative Maintenance to Avoid Starting Problems

Regular maintenance significantly reduces the likelihood of starting issues with your Craftsman 110 mower:

Change the oil according to the manufacturer’s schedule (typically every 25-50 operating hours).
Replace the spark plug annually.
Clean or replace the air filter every 25 operating hours or more frequently in dusty conditions.
Use fuel stabilizer when storing the mower for more than 30 days.
Keep the mower clean, especially the underside of the deck, to prevent debris buildup that can affect overall performance.
Sharpen the blades regularly, as dull blades increase engine strain.
Inspect belts and cables for wear or damage.

By following these preventative maintenance practices, you’ll extend the life of your Craftsman 110 mower and minimize starting problems.

When to Call a Professional

While many Craftsman 110 mower starting issues can be resolved with DIY troubleshooting, some problems warrant professional attention:

Engine compression problems that require internal engine repairs
Major electrical system failures in riding mowers
Persistent starting issues that don’t respond to basic troubleshooting
Hydrostatic transmission problems that may affect starting on riding models
Security or warranty concerns that might be voided by DIY repairs

Professional lawn mower technicians have specialized tools and expertise to diagnose and repair complex issues efficiently.

FAQ: Craftsman 110 Mower Starting Problems

What would cause a Craftsman lawn mower not to start?

The most common causes include stale fuel, a dirty carburetor, faulty spark plug, clogged air filter, dead battery (for riding mowers), engaged safety switches, or a malfunctioning ignition system. Start troubleshooting with the simplest potential causes, such as checking the fuel and spark plug, before proceeding to more complex issues.

Why is my mower engine turning over but not starting?

When the engine turns over but doesn’t start, the electrical system is working, but combustion isn’t occurring. This typically indicates issues with fuel delivery (clogged carburetor or fuel filter), ignition problems (faulty spark plug), or air intake restrictions (dirty air filter). Systematically check each of these systems to identify the specific cause.

How do I start a Craftsman push mower?

To start a Craftsman push mower like the M110: 1) Place the mower on level ground, 2) Prime the engine by pressing the primer bulb 3-5 times if equipped, 3) Hold the operator presence control bar against the handle, 4) Pull the starter rope with a smooth, continuous motion. If the mower has electric start, press the start button while holding the operator presence control bar.

When I turn the key on my lawn mower and nothing happens?

If nothing happens when turning the key on your Craftsman T110 riding mower, the most likely causes are a dead battery, loose/corroded battery connections, a faulty ignition switch, blown fuse, or a defective solenoid. Check the battery voltage with a multimeter (should read about 12.6V) and ensure all connections are clean and tight before inspecting other electrical components.

Why does my Craftsman T110 only run with starting fluid?

When your mower only runs with starting fluid, it indicates a fuel delivery problem. The starting fluid temporarily provides the combustible material needed, but the mower can’t sustain operation because it’s not getting regular fuel. Check for clogged fuel lines, a malfunctioning fuel solenoid, or carburetor issues that prevent proper fuel flow to the engine.

How often should I replace the spark plug in my Craftsman 110 mower?

For optimal performance, replace the spark plug in your Craftsman 110 mower annually or every 100 operating hours, whichever comes first. Regular replacement ensures proper spark for efficient starting and operation. Use the manufacturer-recommended spark plug type and gap setting specified in your owner’s manual.

Can a safety switch prevent my Craftsman T110 from starting?

Yes, Craftsman T110 riding mowers have multiple safety switches that can prevent starting if not properly engaged. These include the seat safety switch, brake safety switch, PTO switch, and neutral safety switch. If any switch is faulty or its circuit is incomplete, the mower won’t start as a safety precaution. These switches can be individually tested with a multimeter to identify any malfunctions.

Final Words

Troubleshooting a Craftsman 110 mower that won’t start can be frustrating, but by systematically addressing each potential cause, you can often resolve the issue yourself. Remember to start with the simplest explanations—fuel quality, battery condition, and spark plug functionality—before moving on to more complex systems. Regular maintenance is your best defense against starting problems, so establish a seasonal maintenance routine for your Craftsman 110 mower to ensure reliable performance throughout the mowing season.

Whether you own a Craftsman T110 riding mower or M110 push mower, the principles of engine operation remain the same. With proper care and timely interventions when problems arise, your Craftsman 110 mower will provide years of dependable lawn care service. If you continue to experience starting issues after exhausting these troubleshooting steps, consult a professional lawn mower repair service to diagnose and address more complex mechanical or electrical problems.

Craftsman 110 Mower Wont Start