Learning how to start John Deere lawn mower is the first step to a perfect cut. John Deere mowers have a characteristic starting procedure that ensures a smooth and reliable engine turnover every time. While it might seem straightforward, following the correct sequence protects your engine and gets you mowing faster. This guide covers every model, from riding mowers to push mowers, and will help you troubleshoot any issues you encounter.
How To Start John Deere Lawn Mower
Before you turn the key or pull the cord, a few universal checks are needed. These steps prepare the mower and its systems for a safe start. Skipping them can lead to starting problems or even damage.
Pre-Starting Checklist For Safety And Performance
Always perform these checks in a well-ventilated area, preferably outdoors. Ensure the mower is on a level surface.
- Check the Fuel Level: Make sure there is fresh, clean gasoline in the tank. Old fuel can clog the carburetor and prevent starting.
- Inspect the Oil: Use the dipstick to verify the oil level is between the “Full” and “Add” marks. Low oil can trigger a safety shutdown on many models.
- Look for Obstructions: Check the mower deck for packed grass, twigs, or debris. Clear any blockages around the blade and discharge chute.
- Engage the Parking Brake: For riding mowers, always set the parking brake firmly before attempting to start.
- Check the Battery Connections: If your model has a battery, ensure the terminals are clean and tight. Corrosion can prevent a good connection.
Understanding Your Mower’s Controls And Features
Familiarize yourself with the specific controls on your John Deere. Common features include:
- Ignition Switch/Key: Used on riding mowers and electric-start push mowers.
- Throttle/Choke Control: Often a lever or dial for setting engine speed and choke function.
- Blade Engagement Lever (PTO): Engages the cutting blades on riding mowers.
- Fuel Shut-Off Valve: Some models have a manual valve in the fuel line.
- Primer Bulb: A small rubber button on many push mowers that pumps fuel into the carburetor.
Step-By-Step Starting Procedure For Riding Mowers
John Deere riding lawn mowers and tractors use a key-based ignition system. The exact model may have slight variations, but this procedure applies to most.
- Mount the mower and ensure you are seated securely. The seat safety switch will only allow starting if it detects weight.
- Set the parking brake fully. This is a critical safety step.
- Locate the throttle/choke lever. If the engine is cold, move it to the “Choke” position. For a warm engine, set it to “Fast” or the rabbit symbol.
- Make sure the PTO lever (which controls the blades) is in the “OFF” or disengaged position. The engine will not start if the blades are engaged.
- Place the gear shift lever in “Neutral” or “Park,” depending on your model’s transmission.
- Insert the key into the ignition switch. Turn it to the “ON” or “RUN” position to activate the electrical system. You may hear a fuel pump click.
- Finally, turn the key to the “START” position. Release the key as soon as the engine cranks and starts. It should spring back to the “ON” position.
- If you used the choke, gradually move the throttle lever to the “Fast” position as the engine warms up over 30 seconds.
Step-By-Step Starting Procedure For Push Mowers
Starting a John Deere walk-behind mower involves a manual recoil starter. The process is physical but simple when done correctly.
- Check that the fuel valve, if present, is in the “ON” position.
- Locate the engine speed control. Set the throttle lever to “Fast” or the choke symbol if the engine is cold.
- Find the primer bulb on the side of the engine. Press it firmly 3 times. Do not over-prime, as this can flood the engine. If the engine is warm, one press is often enough.
- Grasp the starter handle on the mower. If there is a blade control bar (also called a “bail”), you must hold it against the handle to engage the engine brake and allow starting.
- Pull the starter cord slowly until you feel resistance (this is the compression stroke). Then, pull it rapidly and firmly. Do not yank it all the way out; let it rewind smoothly.
- If the engine doesn’t start on the first or second pull, repeat the process. After several attempts, you may need to adjust the choke or check for flooding.
What To Do If Your Push Mower Floods
If you smell strong gasoline after multiple pulls, the engine may be flooded. Move the throttle to the “Fast” position and do NOT prime it. Pull the starter cord repeatedly (about 10 times) with the blade control engaged to clear excess fuel. Then, try the normal starting sequence again.
Starting A John Deere Mower With A Dead Battery
If your electric-start mower clicks or does nothing, the battery is likely discharged. You have a few options.
- Jump-Start the Mower: Using jumper cables and a running vehicle or a portable jump-starter pack, connect positive to positive and negative to a clean, unpainted metal part on the mower frame. Start the mower, then disconnect carefully.
- Bypass with a Pull-Start: Some John Deere riding mowers have a backup recoil starter. Consult your manual for its location and use procedure.
- Use a Battery Charger: A maintainer or trickle charger can slowly recharge the battery if it is not completely dead.
Essential Seasonal Starting Tips
Long periods of storage, like over winter, require extra steps for an easy start.
Starting After Winter Storage
If you prepared your mower for storage by adding fuel stabilizer, starting should be easier. If not, you may need to drain old fuel from the tank and carburetor. Check and change the oil if needed, and ensure the air filter is clean. A fresh spark plug can also make a significant difference after a long dormancy.
Starting For The First Time In Spring
Beyond the winter storage steps, inspect the mower thoroughly. Check tire pressure, lubricate moving parts, and install a fully charged battery. It’s a good idea to perform these checks before you really need to mow, so you have time to address any issues.
Advanced Troubleshooting For Common Problems
If you’ve followed all steps and the mower still won’t start, use this guide to diagnose the issue.
Engine Cranks But Won’t Start
This usually indicates a fuel or spark issue.
- Check for stale fuel and replace with fresh gasoline.
- Inspect the spark plug. Remove it, reconnect the wire, and ground the metal base against the engine. Pull the starter cord; you should see a bright blue spark. If not, replace the plug.
- Ensure the fuel line is not kinked and the fuel filter, if equipped, is not clogged.
No Sound When Turning The Key
This points to an electrical problem.
- Verify the parking brake is fully set and you are seated properly.
- Check that the PTO/blade engage lever is in the “OFF” position.
- Inspect battery terminals for corrosion and ensure the battery has a charge.
- Check all safety switch connections; a faulty seat switch or brake switch can interrupt the starting circuit.
Engine Starts Then Immediately Dies
This often signals a problem with fuel delivery or a safety interlock.
- If it dies when you release the key, the ignition switch may be faulty.
- If it dies when engaging the blades, the PTO switch or circuit could be the problem.
- A clogged fuel cap vent can create a vacuum in the tank, stopping fuel flow. Try starting with the fuel cap loosened slightly.
Routine Maintenance To Ensure Easy Starts
Consistent care prevents most starting troubles. Follow this simple maintenance schedule.
- After Each Use: Clean the mower deck to prevent grass buildup.
- Every 25 Hours: Check the air filter and clean or replace it if dirty.
- Every 50 Hours: Change the engine oil (or once per season).
- Every 100 Hours: Replace the spark plug and fuel filter.
- Seasonal: Sharpen or replace the mower blade, and check tire pressure and battery charge before storage.
Frequently Asked Questions
Why Won’t My John Deere Lawn Mower Start?
The most common reasons are stale fuel, a dirty air filter, a faulty spark plug, a discharged battery, or a tripped safety switch. Always begin troubleshooting with the pre-start checklist.
Where Is The Primer Bulb On A John Deere Mower?
The primer bulb is typically a small, red, rubber button located on the side of the engine, near the air filter housing. Not all models have one; some use an automatic choke instead.
What Is The Correct Starting Procedure For A John Deere S100?
For the S100 riding mower, ensure you’re seated, set the parking brake, disengage the PTO, move the throttle to choke, and turn the key. The process is standard for most John Deere lawn tractors.
How Do You Start A John Deere Mower That Has Been Sitting?
First, drain and replace any old gasoline. Check the oil level and condition. Inspect the air filter and spark plug. You may need to prime the system several times or crank the engine longer to get fresh fuel to the carburetor.
Can You Jump Start A John Deere Lawn Mower?
Yes, you can jump-start a riding mower with a dead battery using jumper cables and a vehicle or a jump-starter pack. Always connect the negative cable to the mower’s frame, not the dead battery’s negative terminal, to avoid sparks.
Following these instructions for how to start your John Deere lawn mower will lead to reliable performance season after season. Remember, consistency is key—always follow the pre-start checks and the correct sequence for your specific model. If problems persist, consult your owner’s manual or a certified John Deere service technician for further assistance. Proper starting is the foundation of a long and healthy life for your mower.