The most common problem when a Mastercut zero turn radius lawn mower gives a bad cut or cuts the grass unevenly is due to dull blades. The lawn mower blades should be sharpened at least once every season depending on how much the lawn mower is used. If the blade is bent from hitting a hard or solid object, then it should be replaced.
Check the lawn mower deck to make sure it is level and the check the tire pressure of the tires to make sure they are all even.
Always clean underneath the mower where the blades are to remove any grass and buildup after each use. You can usually just spray it down with a hose to remove any debris.
The model and serial numbers on your Mastercut zero-turn mower can be found on the frame of the mower or under the seat.
NOTE: if you need a part for the small engine in your Mastercut zero-turn mower, there will be a separate model/serial number for the engine. Here are the small engines that are available in your Mastercut mower. Visit the page of the engine you have to find out where the model/serial number is located for your small engine model: