No clues following my initial post about the spring failing three times...I installed a new one and then shone a trouble light under the mower with the deck lowered and the engine running.....the belt appears to run smoothly through all of the pulleys, but the tension spring is vibrating quite...
I have an x300 with 90 hours on it....the drive belt idler tension spring broke two months ago and I replaced it. It has just broken again after about 4 hours cutting...anybody else experienced this problem?....everything under the mower appears to be fine.