I reciently bought a cub 3660 zturn commercial and have had prablems with grass deposits on the righi side of the mower. It will leave a one inch trail of grass when cutting thick grass. only in sertain types of grass. After many calls to the rep my dealer told me that they are sending another set of blades to run in conjunction with the high lifts already on . Cub has known of the problem and has been working with their techs to find a solution. Doubles.lets see how that works. Yes they did crank up the rpms 3650 and set the deck to its proper pitch . I just wonder where they got this idea from??????