How Do You Change a Tire on a Riding Lawn Mower?
To change a tire on a riding lawn mower, first ensure safety by parking on level ground, engaging the parking brake, and disconnecting the spark plug wire. Use a jack to lift the mower at the manufacturer’s recommended jack point, remove the lug nuts with a lug wrench or socket set, take off the old tire, mount the new tire, hand-tighten the lug nuts, lower the mower, and then torque the lug nuts to the specified setting. Always consult your owner’s manual for model-specific instructions on jack points and tire pressure.
What Safety Precautions Should You Take First?
Before you begin any work on your riding lawn mower, prioritizing safety is critical to prevent injury or damage to the machine. Skipping these steps can lead to the mower rolling, accidental startup, or improper lifting.
- Park on a Flat, Level Surface: Always perform tire changes on a hard, level surface like a concrete driveway or garage floor. Avoid grass or soft ground where a jack could sink or become unstable.
- Engage the Parking Brake: Firmly set the parking brake to prevent the mower from rolling while it is lifted. If your mower has a transmission lock, engage it as well.
- Disconnect the Spark Plug Wire: This is the most important safety step. Locate the spark plug, usually on the engine’s side, and pull the rubber boot off the terminal. This prevents the engine from accidentally starting if the key is turned or the blade is engaged.
- Remove the Key: Take the ignition key out of the switch and keep it in your pocket.
- Let the Engine Cool: If the mower has been running, allow the engine and exhaust components to cool completely to avoid burns.
What Tools and Materials Do You Need?
Having the right tools on hand makes the job efficient and ensures you don’t damage the mower’s components. While specific sizes can vary by model, this list covers the essentials.
| Tool/Material | Purpose |
|---|---|
| Trolley Jack or Mower Jack | To safely lift the mower. A hydraulic trolley jack is common; a specialized mower jack or lift is even better. |
| Jack Stands | Never work under a mower supported only by a jack. Always use jack stands to secure the frame once lifted. |
| Lug Wrench or Socket Set | To remove and tighten the lug nuts. A 4-way lug wrench is convenient, but a socket set with the correct size (commonly 1/2″ or 3/4″) is often needed. |
| Torque Wrench | Essential for tightening lug nuts to the manufacturer’s specification to prevent warping the wheel or having nuts come loose. |
| Tire Pressure Gauge | To check and set the correct PSI in the new tire after installation. |
| Owner’s Manual | For model-specific information on jack points, lug nut torque specs, and tire pressure. |
How Do You Lift the Riding Lawn Mower Safely?
Lifting the mower correctly is crucial for both safety and preventing damage to the frame or body. The location of the safe jack point is the most important detail to get right.
Finding the Correct Jack Point
Always refer to your owner’s manual for the exact location. On most riding mowers, the recommended jack point is a reinforced section of the front or rear frame, often near the center of the axle you are lifting. Placing the jack on a plastic body panel, a thin metal sheet, or a non-reinforced part of the frame can cause significant damage.
Using the Jack and Jack Stands
- Position the jack under the designated jack point on the side of the mower where you need to change the tire.
- Pump the jack handle slowly to raise the mower until the tire is a few inches off the ground.
- Immediately place jack stands under the mower’s frame near the jack for secure support.
- Slowly lower the jack until the mower’s weight rests firmly on the jack stands. The jack can remain in place as a backup, but the stands should bear the load.
Why you should never use a car jack: While a car jack might physically lift the mower, its lifting pad is often too large and may not contact the correct, narrow jack point on a mower frame. A mower-specific or low-profile trolley jack is designed for the correct contact area and height.
How Do You Remove and Install the Tire?
With the mower safely lifted and supported, you can proceed with the tire swap. Work methodically to avoid losing parts or misaligning the new wheel.
Removing the Old Tire
- Loosen Lug Nuts First: Before lifting the mower completely off the ground (while the tire still has some friction), use your lug wrench to break the lug nuts loose. Turn them counterclockwise. Do not remove them yet.
- Lift and Secure: Now, use the jack and jack stands as described above to raise the tire fully off the ground.
- Remove Lug Nuts and Tire: Finish unscrewing the loosened lug nuts by hand and keep them in a safe place. Carefully pull the old tire straight off the wheel studs.
Installing the New Tire
- Align and Mount: Lift the new tire and align its holes with the wheel studs on the axle hub. Slide it on until it sits flush against the mounting surface.
- Hand-Tighten Lug Nuts: Thread the lug nuts back on by hand, turning clockwise. This ensures they are not cross-threaded. Tighten them in a star or crisscross pattern until they are snug.
- Initial Lowering and Torquing: Use the jack to lower the mower until the tire just touches the ground. This provides enough resistance to torque the nuts properly. Using a torque wrench, tighten the lug nuts to the specification found in your owner’s manual (commonly 35-65 ft-lbs), again following the star pattern.
- Final Lowering: Once all nuts are torqued, remove the jack stands and fully lower the mower to the ground.
What Final Checks Should You Perform?
The job isn’t complete until you’ve verified everything is secure and ready for operation.
- Double-Check Lug Nut Torque: After lowering the mower completely, give each lug nut one final check with the torque wrench to ensure they are tight.
- Check Tire Pressure: Use a tire pressure gauge to inflate the new tire to the PSI recommended in your owner’s manual or on the tire’s sidewall. Proper pressure ensures even wear, good traction, and prevents rim damage.
- Reconnect the Spark Plug: Firmly push the spark plug wire boot back onto the spark plug terminal.
- Test Operation: Briefly start the mower and move it forward and backward a short distance in a safe area to ensure the wheel is secure and there are no unusual noises or vibrations.
Frequently Asked Questions
Can I use a regular car jack to lift my riding lawn mower?
While it might physically lift the mower, it is not recommended. Car jacks are designed for different lift points and may not securely contact the narrow, reinforced jack points on a mower frame. Using an incorrect jack can damage the mower’s frame or body and is less stable. A hydraulic trolley jack or a dedicated mower jack is a safer and more appropriate tool.
What if I don’t have a torque wrench? Can I just tighten the lug nuts really hard?
It is strongly advised against. Over-tightening lug nuts can warp the wheel rim, strip the threads on the studs, or even cause the studs to break. Under-tightening can allow the wheel to wobble and come loose during operation. A torque wrench is the only way to ensure lug nuts are tightened to the manufacturer’s safe specification. If you don’t have one, consider borrowing or purchasing an inexpensive beam-type torque wrench.
How do I know what size tire to buy for my mower?
The correct tire size is printed on the sidewall of your existing tires. It will be a series of numbers like “15×6.00-6” or “20×10.00-8”. The first number is the overall diameter, the second is the width, and the last is the rim diameter. Always replace tires with the exact same size specifications. Your owner’s manual will also list the correct sizes.
Should I change both tires on the same axle at the same time?
It is generally recommended to replace tires in pairs (both front or both rear) to ensure even wear, traction, and handling. If one tire is worn or damaged, the other on the same axle is likely in a similar condition. Mixing a new tire with a very old, worn one can lead to uneven cutting and an unstable ride.
