funny i saw this thread...i have a gravely prosteer 1336...last yr when i got it the right side seemed to get weaker and weaker as far as pulling the right tire...said something to my dealer a couple of times...i have adjusted the bar almost all the way out...was in there a couple of days ago nad he said bring by and let them look at it...mechanic sad that there is no way that the belt should be that loose w/ only 98hr..i said that it started getting that way after 5hrs use...he said to replace the belt and see if that corrects the problem...they told me a new belt was over $57!!!!!!!!!!!!!!!!!!!!!!
i said no way i'm paying $57 bucks for a belt that should not need replacing so soon and since i have been complaining about the problem since i bought the mower...dealer got on the phone w/ gravely, they approved two new belts at no charge and said that they might be replacing the rear pulleys, that they may be something wrong or they are looking at some new kind of pully or something...sorry to be so winded...bought crapped my pants when they told me $57...so my $2500 mower has $114 worth of drive belts...amazing..