Cub Cadet Lt1045 Belt Problems . I have a cub cadet lt1045. The belts' length is why it swings too far back. I have a cub cadet lt 1045 rider with a 46" deck that I can't keep a from www.justanswer.com The mower belt keeps coming off. Discussion starter · #5 · jun 5, 2014. I've noticed that the rod for the brake on the left side has come out and the spring is keeping the brake pressed against the spindle.