The most common cause for a John Deere zero turn lawn mower engine to overheat is low oil. Always check the oil level before each use to make sure the engine has the correct amount. Otherwise, it wonâ€™t run properly.
Also, clean any debris or grass away from the cooling fins on the engine. This could also cause the engine to overheat.
The model and serial numbers on your John Deere zero-turn mower can be found under the seat, on the top right side of the frame.
NOTE: if you need a part for the small engine in your John Deere zero-turn mower, there will be a separate model/serial number for the engine. Here are the small engines that are available in your John Deere mower. Visit the page of the engine you have to find out where the model/serial number is located for your small engine model: