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John Deere STX38 Shredding Belt to Mower Deck


animalfriendly's Avatar
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TX

07-12-15, 09:10 PM   #1  
John Deere STX38 Shredding Belt to Mower Deck

Hello.

I just bought a used JD STX38 (yellow deck) and enjoyed mowing about 1/4 acre of easy grass and then when I went into some taller stuff the mower suddenly stopped spinning. I looked at the deck and saw the remains of the shredded belt that connects the PTO to the Mower Deck.

I figured the old one was worn out so I got a new belt from the JD dealership ($20) and put it on (this is not as fun as on newer JD riding mowers either). The engine stopped here and there through some easy stuff again, but when I got to some taller grass (where it had to work a little), it shredded the new belt! It is a fun mower to drive--turns easy and has a great chute that blows the grass behind instead of directly to the side, so I'd like to fix it. Also, it fits between the wheel wells of a Ford Ranger.

Before I start replacing random tensioners and stuff, I was wondering if anyone on this forum might have some ideas.

Is this a common occurrence? Is the tensioner spring too tight (the spring was not the easiest to put on--had to pull it a couple inches)? I saw a post on the internet about some kind of design flaw with a spacer on the deck somewhere--anyone heard of any "TSB"s with this mower.

 
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cheese's Avatar
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07-12-15, 10:04 PM   #2  
Check for bad idler pulleys, belt mis-alignment, deck tilted too far down in the front, or any places where the belt is rubbing another part.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
animalfriendly's Avatar
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07-13-15, 06:01 AM   #3  
Thanks! The deck does appear to be too far down in the front (obviously not level at least). You think this will cause shredding of a new belt? The fix sounds too easy to be true.

 
Norm201's Avatar
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07-13-15, 06:10 AM   #4  
I've got an owners manual for this unit if you need it. PM and I can send it to you.

 
cheese's Avatar
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07-13-15, 08:32 AM   #5  
The front can be down just a little, but it shouldn't be more than a half inch or so. A heavy tilt to the front puts the pulleys at too much angle in relation to the belt coming from the engine. Usually this causes the belt to jump off a lot rather than to shred. Overheating the belt can cause it to shred as well.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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