1. Incorrect Tire Installation: If the tire was not installed correctly, it could cause the mower to lose traction and not move forward when you press the gas pedal. Make sure the tire is properly seated on the rim and inflated to the recommended pressure.
2. Transmission Issues: Problems with the transmission can prevent the mower from moving even if the engine starts. Check the transmission fluid level and condition and ensure that the transmission belt is in good condition and correctly tensioned.
3. Drive Belt Problems: The drive belt is responsible for transferring power from the engine to the transmission. If the drive belt is broken, worn, or loose, it can cause the mower not to move when you push the gas. Inspect the drive belt and replace it if necessary.
4. Clutch Issues: If your John Deere riding mower has a clutch, a problem with the clutch can cause it not to engage properly, preventing the mower from moving. Check the clutch for signs of wear or damage, and adjust or replace it as needed.
5. Brake Issues: If the brakes are engaged or stuck, they can prevent the mower from moving. Ensure the brakes are fully released and not obstructing the wheels.
6. Parking Brake: Some John Deere riding mowers have a parking brake that can lock the wheels in place. Ensure the parking brake is disengaged before attempting to move the mower.
7. Faulty Ignition Switch: A faulty ignition switch may not send the signal to engage the starter motor, preventing the engine from starting or the mower from moving.
If you have checked all of these potential issues and the mower still does not move, it is recommended to take it to a qualified repair technician for further diagnosis and repair.