Go BottomBelt tension
 | a522441
Join Date: May 2007 Posts: 6 Charlotte 
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2007-05-07 141880
I have a JD STX30 riding mower and the belt appears fairly loose (mower deck belt). I cannot find the length of the belt in the manual and the previous owner has said the belt is new, but I want to make sure it is not a belt for a STX38. Does anyone have the length of the belt, and/or can let me know how tight it should be?
The belt is almost falling off when the deck is in the lowest position, a little taught in the upermost position. The tensioner doesn't really make it tight at all. Thanks!
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| hardwood
Join Date: Dec 2002 Posts: 3583 iowa 
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2007-05-07 141891
Is it a John Deere belt? If so a call to the parts dept. at a Deere dealer, they will check the part number for you. Most Deere decks have a decal somewhere on top of the deck detailing the route of the belt thru the pulleys and idlers, check that. Are the bearings loose in the blade spindle ('s) or the idlers? Hope this helps. Frank. ....
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| a522441
Join Date: May 2007 Posts: 6 Charlotte
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2007-05-07 141894
It's a john deere belt, but it doesn't have any numbers on it that I could see. I had the belt routed properly per the manual and all pulleys seem tight and spin freely as expected. I did put a belt guide on it, but I am not sure if this one specifically had one from the factory. I have not gotten a chance to test it due to my other issues. Thanks! ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2007-05-07 141895
It should be a 1/2" x 104-5/8" belt on that unit.
Best of luck. ....
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| a522441
Join Date: May 2007 Posts: 6 Charlotte
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2007-05-07 141896
Thanks Murf! ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2007-05-07 141898
Always happy to help.
Any place that sells belts should be able to look it up for you. Double check it though, my guide has been wrong before!
Best of luck. ....
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| jd110_1963
Join Date: Feb 2002 Posts: 87 westminster, md
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2007-05-07 141917
That belt should be a M41960 that measures 1/2" X 102.3". I don't mean to contradict Murf 'cause he is usually right, but it sounded kind of long so I double checked. Even 102.3 sounds long to me for a single bladed deck, but that is what I came up with. ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2007-05-08 141929
No worries, like I said, the guide I have has been wrong before.
Best of luck. ....
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