If you’re new to owning a John Deere riding mower or tractor, you might be wondering exactly how to start a John Deere lawn mower. The process is straightforward once you know the steps, but it does involve a few specific safety and operational checks that are crucial for the machine to operate correctly.
John Deere mowers may have a particular starting procedure, often including sitting in the seat and ensuring the parking brake is set. This guide will walk you through the universal steps for most models, from the older manual-start machines to the modern key-start and push-button models, ensuring you can get your lawn care done efficiently and safely.
How To Start A John Deere Lawn Mower
This section covers the universal, step-by-step procedure that applies to nearly every John Deere riding mower or lawn tractor. Following these steps in order is the best way to ensure a smooth start every time and to avoid potential damage to the mower’s starting system.
Step 1: Perform A Pre-Start Safety Check
Before you even think about turning the key, a quick visual and operational inspection is essential. This check helps prevent accidents and identifies potential problems before they escalate.
- Clear the Area: Walk the mowing path and remove any large sticks, toys, rocks, or debris that could become dangerous projectiles.
- Check Tire Pressure: Visually inspect the tires for proper inflation. Low tires can affect cutting quality and stability.
- Inspect the Mower Deck: Look underneath the deck for any caked-on grass clippings or obstructions that need to be cleared.
- Verify Blade Condition: Ensure the mower blades are securely attached and not bent or damaged.
Step 2: Prepare The Mower For Starting
Now, you need to get on the mower and configure all the controls into their correct “start” positions. Missing one of these steps is a common reason a John Deere mower won’t start.
- Set the Parking Brake: Fully engage the parking brake. This is a critical safety interlock on all models.
- Adjust the Throttle: Move the throttle/choke control to the “Fast” or “Choke” position. For a cold engine, use “Choke.” For a warm engine, “Fast” is usually sufficient.
- Set the Blade Control (PTO): Ensure the blade engagement lever or switch is in the “OFF” or “Disengaged” position. The engine will not start if the blades are engaged.
- Check the Gear Selection: For manual gear drive (shift lever) models, place the shift lever in “Neutral.” For hydrostatic models (no gears), ensure the speed control lever is in the “Neutral” lock position.
Step 3: Engage The Ignition Sequence
With all controls set, you can now proceed to start the engine. The exact method depends on whether your mower has a key switch, a push-button, or a manual choke.
For Key Start Models
Insert the key into the ignition switch. Turn the key firmly to the “RUN” or “ON” position first to activate the electrical system. You may hear a faint click. Then, turn the key all the way to “START.” Release the key as soon as the engine cranks; it will spring back to the “ON” position.
For Push-Button Start Models
On newer John Deere mowers, you may have a start/stop button. Often, you must press the brake pedal fully, then press and hold the button until the engine starts. Always consult your operator’s manual for the specific sequence.
For Manual Choke and Primer Models
Older or smaller John Deere engines might have a manual choke lever and a primer bulb. If the engine is cold, close the choke lever. Press the primer bulb 3 times (do not over-prime). Then, turn the key or pull the recoil starter rope.
Step 4: Post-Start Warm Up And Operation
Once the engine is running, allow it to warm up for 30 to 60 seconds, especially if you used the choke. This lets oil circulate and the engine to reach a stable operating temperature.
- Adjust the Throttle: If you used the choke, gradually open the choke lever or move the throttle to a mid-range setting as the engine warms.
- Disengage the Parking Brake: To begin mowing, press the brake pedal, release the parking brake lever, and then slowly release the brake pedal.
- Engage the Blades: Only engage the mower blades (PTO) when you are fully ready to cut and the engine is running at full operating speed (throttle in “Fast”).
Troubleshooting Common Starting Problems
If your John Deere mower doesn’t start, don’t worry. Work through this logical checklist before calling for service. Most issues have a simple fix.
The Engine Won’t Crank At All
If you turn the key and hear nothing, or just a single click, the issue is likely electrical.
- Parking Brake: Double-check that the parking brake is fully set.
- Seat Switch: Ensure you are sitting firmly in the seat. The mower is designed not to start if it doesn’t detect an operator.
- Battery Connections: Check for loose or corroded battery cables.
- Battery Charge: The battery may be dead. Test it or try jump-starting the mower with jumper cables (refer to your manual for proper procedure).
- Blade Engagement: Confirm the PTO/blade switch is “OFF.”
- Fuse: Locate and check the main fuse in the electrical system.
The Engine Cranks But Won’t Start
If the starter motor is turning the engine over but it won’t fire up, the problem is usually related to fuel or spark.
- Check the Fuel: Is there fresh gasoline in the tank? Old, stale fuel is a leading cause of starting issues. Drain and replace with fresh fuel if needed.
- Fuel Shut-Off Valve: On some models, a manual fuel valve under the tank might be closed.
- Choke/Throttle Setting: For a cold engine, make sure the choke is fully on. For a warm engine, try starting with the choke off.
- Spark Plug: Remove and inspect the spark plug. Is it fouled, wet, or damaged? Clean it with a wire brush or replace it with a new, properly gapped plug.
The Engine Starts Then Immediately Dies
This often points to a safety interlock issue or fuel delivery problem. The most common culprit is the seat safety switch. The mower starts when you’re seated, but if you lift off the seat with the parking brake not set, it will stall. Make sure you remain seated and that all safety switches are funtioning correctly.
Seasonal Starting Considerations
How you start your mower can depend on the time of year, especially if it has been in storage.
Starting After Winter Storage
Proper preparation in the fall makes spring starting easy. If you didn’t prepare it, you may need to:
- Install a fully charged battery.
- Drain any old fuel from the tank and carburetor, and add fresh gasoline.
- Check the oil level and condition.
- Inspect the air filter and clean or replace it if dirty.
Starting In Cold Weather
Colder temperatures make engines harder to start. Use the choke fully, and consider letting the engine crank for a few 5-10 second intervals with pauses in between to avoid flooding. A battery maintainer used during storage will ensure a strong charge.
Starting In Hot Weather
Hot engines can be prone to vapor lock (fuel vaporizing in the lines). If the mower was just running and is hot, try starting it without any choke. If it cranks but doesn’t start, let it cool down for 15-20 minutes before trying again.
Essential Maintenance For Reliable Starting
Consistent, simple maintenance is the key to avoiding starting problems alltogether. A well-maintained mower starts with ease season after season.
- Battery Care: Keep the terminals clean and tight. Use a trickle charger during long off-season storage to prevent the battery from discharging completely.
- Fresh Fuel: Always use fresh, clean gasoline. Consider using a fuel stabilizer if you plan to store the mower for more than 30 days, and try to run the engine dry or use a fuel additive before storage.
- Air Filter Service: A clogged air filter restricts airflow and makes starting difficult. Check the filter regularly and replace it according to the maintenance schedule—usually once a season or more often in dusty conditions.
- Spark Plug: Replace the spark plug at least once per mowing season, or as recommended in your manual. A worn plug provides a weak spark.
- Oil Changes: Change the engine oil and filter regularly. Old, dirty oil increases engine wear and can make an engine harder to turn over.
Safety Reminders Every Operator Should Know
John Deere’s starting procedure is built around your safety. Never bypass safety switches or ignore these fundamental rules.
- Always start the engine from the operator’s seat, never while standing beside the mower.
- Keep your hands and feet away from the mower deck and discharge chute at all times.
- Do not ever attempt to start the mower with the blades engaged.
- Make sure children and pets are indoors or at a safe distance before starting and operating the equipment.
- Always wear sturdy shoes and eye protection while operating your lawn mower.
Frequently Asked Questions (FAQ)
Why Do I Have To Sit In The Seat To Start My John Deere Mower?
This is a critical safety feature. The seat switch is an interlock that prevents the engine from starting unless it detects an operator’s weight. This stops the mower from being started accidentally while someone is near it, and it also activates the automatic shutdown if you leave the seat with the blades engaged.
What Is The Correct Way To Start A John Deere Lawn Tractor?
The correct way is to follow the operator-presence safety system: set the parking brake, ensure the blade control is off, put the transmission in neutral, sit firmly in the seat, then turn the ignition key. This sequence ensures all safety interlocks are satisfied.
How Do You Start A John Deere Mower That Has Been Sitting?
For a mower that’s been sitting, especially over winter, check the battery charge, add fresh gasoline, and verify the oil level. You may need to clean the spark plug and air filter. Prime the system if it has a primer bulb, use full choke, and be prepared to crank it slightly longer than usual.
Where Is The Primer Bulb On A John Deere Lawn Mower?
The primer bulb is typically a small, red, rubber button located on the engine cowling, near the air filter or throttle controls. Not all models have one; newer engines often have an automatic choke system instead. Press it firmly 2-3 times before starting a cold engine.
Why Won’t My John Deere Lawn Mower Turn Over?
If it won’t turn over (crank), the issue is almost always electrical. Check the simple things first: the parking brake, seat switch, blade engagement switch, and battery connections. A dead battery or a faulty safety interlock switch are the most common causes for no crank situations.