Having trouble starting your Craftsman lawn mower? Don’t worry, we’ve got your back! In this article, we’ll provide you with some troubleshooting tips to help you figure out why your trusty mower isn’t starting. With our friendly advice, you’ll soon be back to enjoying a perfectly manicured lawn in no time. So sit back, relax, and let’s get your Craftsman lawn mower running smoothly again!
Electrical Issues
Check the spark plug
When your Craftsman lawn mower won’t start, one of the first things you should check is the spark plug. Over time, the spark plug can become worn or dirty, which can prevent it from creating a spark to ignite the fuel in the engine. To check the spark plug, simply remove it from the engine using a spark plug socket and inspect it. If the spark plug appears dirty or damaged, it’s time to replace it with a new one.
Inspect the ignition coil
Another electrical component that can cause your Craftsman lawn mower to fail to start is the ignition coil. The ignition coil is responsible for generating the high voltage needed to ignite the fuel in the engine. If the ignition coil is faulty or damaged, it will prevent the engine from starting. To inspect the ignition coil, remove the engine cover and locate the coil. Check for any signs of damage, such as cracks or exposed wires. If you notice any issues, it’s best to replace the ignition coil to ensure your lawn mower starts properly.
Test the solenoid
The solenoid is an important part of your Craftsman lawn mower’s electrical system. It is responsible for transferring electrical current to the starter motor to start the engine. If the solenoid is faulty or damaged, it may not be able to transmit the necessary current to the starter motor, resulting in a failure to start. To test the solenoid, you can use a multimeter to measure the voltage at the solenoid terminals. If you don’t get a reading, or the reading is significantly lower than it should be, it’s likely that the solenoid is the culprit and should be replaced.
Check the wiring
A loose or damaged wire can also be the reason why your Craftsman lawn mower won’t start. Over time, the vibrations from mowing can cause wires to become loose or frayed, interrupting the flow of electricity. Inspect the wiring harness and make sure all connections are secure and free from damage. If you notice any loose or damaged wires, it’s important to repair or replace them to ensure proper electrical flow.
Fuel System Problems
Check the fuel level
One of the most common reasons why a Craftsman lawn mower fails to start is due to a low fuel level. Before investigating more complex issues, make sure that the fuel tank is filled with enough gasoline. Check the fuel level by removing the gas cap and visually inspecting the gas tank. If the fuel level is low, simply refuel the tank and try starting the lawn mower again.
Inspect the fuel filter
A clogged fuel filter can also prevent your Craftsman lawn mower from starting. The fuel filter is responsible for filtering out any impurities or debris from the fuel before it enters the engine. Over time, the fuel filter can become clogged, restricting the flow of fuel and preventing the engine from starting. To inspect the fuel filter, locate it along the fuel line, usually between the fuel tank and the carburetor. If the fuel filter appears dirty or clogged, it’s best to replace it with a new one.
Clean the carburetor
The carburetor plays a crucial role in the fuel system of your Craftsman lawn mower. It mixes the air and fuel in the correct proportions to create the combustible mixture needed for the engine to start. If the carburetor becomes dirty or clogged, it can affect the proper functioning of the engine and prevent it from starting. To clean the carburetor, remove it from the engine and use a carburetor cleaner to remove any dirt or debris. Make sure to clean all the small holes and passages to ensure proper fuel flow.
Check the fuel line
A kinked or clogged fuel line can also be the reason why your Craftsman lawn mower won’t start. The fuel line is responsible for carrying fuel from the tank to the carburetor. Over time, the fuel line can become kinked or clogged with debris, hindering the flow of fuel. Inspect the fuel line for any signs of damage or blockage. If you notice any issues, it’s best to replace the fuel line to ensure proper fuel flow and starting of the engine.
Engine Issues
Inspect the air filter
A dirty or clogged air filter can cause your Craftsman lawn mower’s engine to struggle or fail to start. The air filter is responsible for preventing dirt, debris, and other contaminants from entering the engine and affecting its performance. Over time, the air filter can become clogged with dirt and debris, restricting the flow of air. Inspect the air filter and clean or replace it if necessary to ensure proper airflow to the engine.
Check the oil level
The oil level in your Craftsman lawn mower’s engine plays a crucial role in its proper functioning. If the oil level is too low or the oil is old and dirty, it can affect the engine’s ability to start and run smoothly. Check the oil level using the dipstick and add more oil if necessary. If the oil appears dirty or contaminated, it’s important to drain and replace it with fresh oil to ensure optimal engine performance.
Clean the cooling fins
The cooling fins in your Craftsman lawn mower’s engine are responsible for dissipating heat and keeping the engine at a proper operating temperature. Over time, the cooling fins can become clogged with dirt, grass clippings, and other debris, hindering their ability to cool the engine. Inspect the cooling fins and use a brush or compressed air to clean them. Ensure that they are free from any blockages to prevent overheating and starting issues.
Inspect the valves
The valves in your Craftsman lawn mower’s engine control the flow of air and fuel into and out of the combustion chamber. If the valves become dirty or out of adjustment, it can affect the engine’s ability to start and run smoothly. Inspect the valves and clean them if necessary. If you notice any signs of wear or damage, it’s best to have the valves adjusted or replaced by a professional to ensure optimal engine performance.
Clogged Mower Deck
Clean the mower deck
A clogged mower deck can cause your Craftsman lawn mower to struggle or fail to start. The mower deck is responsible for cutting the grass and can become clogged with grass clippings, dirt, and debris over time. To clean the mower deck, turn off the engine and safely lift the mower. Use a brush or a pressure washer to remove any buildup from the underside of the deck. Ensure that the discharge chute and grass clippings bag are also clear of any obstructions.
Inspect the blade
A dull or damaged blade can affect the cutting performance of your Craftsman lawn mower and cause the engine to strain or fail to start. Inspect the blade for any signs of wear, such as chips or nicks. If the blade appears damaged, it’s best to replace it with a new one. Additionally, make sure to sharpen the blade regularly to ensure clean and efficient cutting.
Check the drive belt
The drive belt in your Craftsman lawn mower is responsible for transferring power from the engine to the cutting blades. If the drive belt becomes loose or damaged, it can affect the blade’s rotation and cause the engine to struggle or fail to start. Inspect the drive belt for any signs of wear or damage, such as fraying or cracking. If you notice any issues, it’s important to replace the drive belt to restore proper functionality.
Faulty Safety Features
Check the safety key
Many Craftsman lawn mowers are equipped with a safety key system to prevent accidental starts. If the safety key is not properly inserted or is damaged, it can prevent the engine from starting. Ensure that the safety key is securely inserted into the ignition switch and check for any signs of damage. If the safety key is not functioning correctly, it may need to be replaced.
Inspect the seat switch
Some Craftsman lawn mowers have a seat switch that is engaged when you sit on the mower. This safety feature prevents the engine from starting or shuts it off when you are not seated. If the seat switch is not properly engaged or is faulty, it can prevent the engine from starting. Inspect the seat switch and make sure it is securely connected and functioning correctly. If necessary, replace the seat switch to ensure proper operation.
Test the blade engagement switch
The blade engagement switch is another safety feature found on many Craftsman lawn mowers. It prevents the cutting blades from turning unless it is engaged. If the blade engagement switch is not properly engaged or is faulty, it can prevent the engine from starting. Test the switch by turning the key to the “On” position and then engaging the blade engagement switch. If the engine does not start or the blades do not spin, there may be an issue with the switch that needs attention.
Battery Problems
Check the battery connections
If your Craftsman lawn mower has an electric start feature, it relies on a battery to provide the necessary power. If the battery connections become loose or corroded, it can prevent the engine from starting. Inspect the battery connections and ensure they are tight and free from corrosion. If you notice any issues, clean the connections and reattach them securely to ensure a proper electrical connection.
Test the battery voltage
A weak or dead battery can be the reason why your Craftsman lawn mower won’t start. Test the battery voltage using a multimeter to determine its charge level. A voltage reading below the recommended range indicates that the battery is weak and may need to be charged or replaced. If the battery voltage is within the recommended range but the engine still fails to start, the issue may lie elsewhere.
Charge or replace the battery
If the battery voltage is low, it’s important to charge it using a battery charger specifically designed for lawn mower batteries. Follow the manufacturer’s instructions to safely charge the battery to its recommended voltage. If the battery fails to hold a charge or the voltage remains low after charging, it’s best to replace it with a new battery to ensure reliable starting of the engine.
Stale or Contaminated Fuel
Drain the old fuel
If your Craftsman lawn mower has been sitting idle for a while, the fuel may have gone stale or become contaminated. Stale or contaminated fuel can prevent the engine from starting or running properly. To address this issue, drain the old fuel from the fuel tank into a suitable container. Avoid pouring the old fuel into the ground or another container that is not designed for fuel storage.
Replace with fresh fuel
After draining the old fuel, replace it with fresh, high-quality gasoline. It’s recommended to use a fuel stabilizer when storing your lawn mower for extended periods to prevent the fuel from going stale. However, if the fuel has already gone bad, it’s best to start with fresh fuel to ensure optimal engine performance and starting.
Use fuel stabilizer
To prevent future issues with stale or contaminated fuel, it’s a good practice to use a fuel stabilizer when filling up your Craftsman lawn mower’s fuel tank. Fuel stabilizers help to keep the fuel fresh and prevent it from breaking down or becoming contaminated over time. Follow the manufacturer’s instructions for the appropriate amount of fuel stabilizer to use based on the size of your lawn mower’s fuel tank.
Ignition Key Issues
Ensure the key is properly inserted
Sometimes, an obvious solution can be overlooked. If your Craftsman lawn mower fails to start, double-check that the ignition key is properly inserted into the ignition switch. Ensure that the key is fully inserted and turned to the “On” position. If the key is loose or not fully turned, it may prevent the engine from starting.
Inspect the ignition switch
The ignition switch is responsible for controlling the flow of electricity from the battery to the engine and other electrical components. If the ignition switch is faulty or damaged, it can prevent the engine from starting. Inspect the ignition switch for any signs of wear, damage, or loose connections. If you notice any issues, it’s best to replace the ignition switch to ensure reliable starting and operation of your Craftsman lawn mower.
Overheating
Clean the cooling system
Overheating can cause your Craftsman lawn mower’s engine to shut down or fail to start. To prevent overheating, make sure the cooling system is clean and free from any obstructions. Inspect the cooling fins, radiator, and other cooling components for dirt, grass clippings, or debris. Use a brush or compressed air to clean them, ensuring proper airflow and cooling.
Check the cylinder head gasket
A faulty cylinder head gasket can cause the engine to overheat and fail to start. Inspect the cylinder head gasket for any signs of damage, such as leaks or cracks. If you notice any issues, it’s best to replace the cylinder head gasket to prevent further damage to the engine.
Inspect the radiator
The radiator in your Craftsman lawn mower’s engine is responsible for cooling the coolant and preventing overheating. If the radiator becomes clogged or damaged, it can affect the engine’s ability to cool properly and cause starting issues. Inspect the radiator for any signs of damage or blockage. If you notice any issues, it’s best to replace the radiator to ensure proper cooling of the engine.
Mechanical Problems
Inspect the starter motor
If your Craftsman lawn mower’s engine fails to start, it’s important to inspect the starter motor. The starter motor is responsible for turning the engine over to start the combustion process. Over time, the starter motor can wear out or become faulty, preventing the engine from starting. Inspect the starter motor for any signs of wear, damage, or loose connections. If you notice any issues, it’s best to replace the starter motor to ensure reliable starting of the engine.
Check the flywheel
The flywheel in your Craftsman lawn mower’s engine is responsible for storing and transferring energy to the engine’s crankshaft. If the flywheel becomes damaged or misaligned, it can affect the engine’s ability to start and run smoothly. Inspect the flywheel for any signs of damage, such as cracks, chips, or misalignment. If you notice any issues, it’s best to have the flywheel repaired or replaced by a professional to ensure optimal engine performance.
Inspect the piston rings
The piston rings in your Craftsman lawn mower’s engine create a tight seal between the piston and cylinder wall, ensuring proper compression and combustion. If the piston rings become worn or damaged, it can cause compression loss and result in starting difficulties. Inspect the piston rings by removing the spark plug and inspecting the cylinder wall for any signs of wear or damage. If you notice any issues, it’s best to have the piston rings replaced by a professional to ensure proper engine compression and performance.
By troubleshooting and addressing these common issues, you can increase the chances of getting your Craftsman lawn mower back up and running smoothly. Remember to follow the manufacturer’s instructions for maintenance and consult a professional if you are unsure or uncomfortable with any repairs. With proper care and attention, your Craftsman lawn mower will be ready to tackle your lawn with ease.