Hi I have a murray 40" cut, 13.5 HP, model # 405000X8. I removed the deck, replaced the belt, and reinstalled the deck. When I started the mower i saw white smoke from the deck and smelt burnt rubber. I thought I was burning up my belt but after further investigation i realized that the smoke was coming from the blade brake. When I engage the deck the brake stays on the pulley and causes it to smoke. How do i fix this? Can I adjust the idler pulley so that when i engage the deck the brake releases the mandrel pulley?