I have a brand new 44 inch blower on my 300 X. When I engage it the pulley hits into the housing before returning back to where it is supposed to be. Dealer looked at it and said the shear pins were too tight. They brought it back and it seemed better. I went out today to run the tractor and engaged the blower. It is hitting once again. It seems better when the blower is raised and worse when all the way down. Any suggestions or is this normal upon engagement?