Started get stuck in flywheel

Hi i had the started tested and tested good as well as the baterery i have a Craftsman lt/200 and the started gear get stuck on the flywheel and never crank the motor when i turn the key to off the started gear stay engauge in the flywheel any help would be appreicated thank sometime i turn the gear with a screwdrive back on the started and it will start the mover but most of the time it don't