John Deere Z355E chewing up deck belts (GX26422) - Pulleys or just cheap belts?

NicholasEdwards70

Forum Newbie
Hey folks, I'm working on a neighbor's John Deere Z355E, 48" deck. Blade drive belt keeps snapping on it, like every 15 hours of mowing, which is nuts.

Before just throwing another belt on and hoping for the best, I checked the spindles and both idler pulleys. Everything spins freely, no play that I could feel. So either I'm missing something or the last belt was just garbage — and it was a cheap generic one, so that's my leading theory.
Was looking at this heavier-duty belt to try instead: https://udcparts.com/products/gx26422-mower-deck-belt-replacement-for-john-deere
Anyone actually used one of these on a Z355E? Also curious if there's some known tensioner or pulley flaw on these ZTrak decks that likes to eat belts, before I bolt this one on and have it happen again in two weeks.
 
Does sound like a cheap polyester belt problem. They just can't take the heat especially when used as a deck belt. I had a similar problem with a Husqvarna years where my aftermarket was selling polyester belts for the deck. They was only lasting 10-20 hrs before. Once I found out they were the wrong type of cording and installed a Kevlar belt the problem went away.

I am coming up with the belt being 1/2" x 145.65"
 
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