I have a land pride brush hog hooked up to my John Deere 5210 tractor. I have been experiencing the issue the bolt that hooks from the pto shaft into the gear box keeps breaking amidst the middle of brush hogging my meadow. Is there a reason for this, I have two bolts break in the matter of 2 days now, and replacing the bolt isn't fun because I can't get my hands inside there guard to slide the bolt into the pto shaft and the gear box at the same time. So I had to remove the guard after yesterday the bolt breaking. Is there a way to avoid from having the bolts break. Any help would be greatly appreciated, also got tractor last year so beginner.