If it is like most Sears lawn tractors, the starter motor gear that engages the flywheel is a composite (read: plastic) pice that over time will wear out. When that happens it will just grind on the flywheel and not start the tractor. The gear is usually installed in the starter motor shaft with a washer, spring, and roll pin. The gear can be purchased and replaced without replacing the entire starter.
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If it is like most Sears lawn tractors, the starter motor gear that engages the flywheel is a composite (read: plastic) pice that over time will wear out. When that happens it will just grind on the flywheel and not start the tractor. The gear is usually installed in the starter motor shaft with a washer, spring, and roll pin. The gear can be purchased and replaced without replacing the entire starter.