Update:
Dad picked up a new belt so we could go mow his new place so the fencing contractor could get to the fenceline and do their job easily.
$33 later after a trip to Lowe's-we had the JD replacement belt,and installed it in about 10 minutes. Got a really good look at the design of the deck and the belt routing,and I'm not really impressed with the tensioning system,but it appears to work OK.
Dad fired up the mower and within 30 minutes the new belt had jumped off.....
Now-I'm more than a bit irritated since we had to pull the pulley guards off again,and it's over 90 degrees outside by now. Well,the new belt was gouged and had a nice sized nick in the outside cover, but considering we were almost an hour's drive to another belt-we put it back in place. Then I noticed something that seemed a bit odd-the deck wasn't even close to being level with it in the lowest position(first time I'd seen it lowered all the way on a flat concrete surface). At first I was concerned that Dad had hit something and bent the leveling rods,but after a very close inspection-all of those components were still like they were when it was shipped. It's pretty apparent that the local Deere dealer that prepped this machine didn't care enough to adjust it properly since he wasn't going to be selling it (Dad bought this machine at the same Lowe's we got the replacement belt from). Took me a mere 5 minutes to adjust the rollers and the leveling of the deck,and even with the gouged/nicked belt-Dad mowed the remaining 2 acres of thick grass/weeds without another incident(about 3 more hours of mowing time with several stops for water and stops to move property stringlines) ,and no scalping at all like it had been doing at my place.
This just proves that the Dealers don't care a bit about the machines that they are "prepping" for sales at the larger stores-and that's a terrible injustice to the very people that are likely to purchase other JD equipment from them at a later date. If I hadn't noticed the deck leveling issue,it's likely that we'd be on the 4th or 5th belt now,and at $30/
ea...That machine would be getting really expensive and the general attitude would be formed that JD equipment was crap. I'm sure Dad would be ridding himself of this belt eating machine very soon if we didn't find this adjustment issue,and all he would have to say about it would be that he'd never own a piece of JD equipment again,and would tell everybody that.
JL