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Discussion Starter #1 (Edited)
I have a John deere La110 with a 42 inch cutting deck. I am trying to replace the deck belt on it for the first time. It seems as though the new belt is not long enough to reach the pulley that hangs below the engine. I bought the correct belt but it still appears to be several inches short.... any advice? Sorry for the rookie question. Every time i watch a video of a replacement, it looks so easy to just slip it on that last pulley, but my belt is either too short or way too tight. can't figure it out.
 

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Have someone pull the tensioner out so that the belt is as loose as possible?
 

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Your belt part number is GX20072 ?

Are you following the instructions in your manual ?

LA 110 Owners Manual


Under "
Mower Service", go to " Replacing Mower Drive Belt ( 107 cm (42 in,) mower Deck)"
 

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Discussion Starter #5
I have followed the manual, and That is my part number. That is why I am so confused. It should work, but it is not, I will try to have someone hold the tensioner for me and see if that helps. I have never been more frustrated.
 

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I have followed the manual, and That is my part number. That is why I am so confused. It should work, but it is not, I will try to have someone hold the tensioner for me and see if that helps. I have never been more frustrated.
Is the Mower Engagement Cable disconnected ? It should be when installing the belt.
 

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You may have to give that tensioner a shot of WD-40. It'll move.
Also, check the deck adjustment-I think it is called the draft rod (the one in the front). Make sure it isn't too loose (which would make the deck further back).
 

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Discussion Starter #11
"DARN", I thought we had something there.
I know that whatever it is, it has to be obvious and I will feel like an idiot when I finally figure it out... I'm just stumped. other than the wrong size belt being packaged in the right packaging... I have no ideas. I laid the new belt next to the old one, the old one was a couple inches longer, however, I chalked that up to it being old and stretched out.
 

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I'd start with measuring/comparing the length of the old belt with the new belt. Take into account some stretching and wear, but it shouldn't be that much longer. If the lengths match, then 9 times out of 10 it's the routing, or as mentioned the tensioner. Sometimes that actual belt has been changed mid production and doesn't show up in the manual/parts list.

Make sure you're not going around a post or guide that would make the new belt appear too short.

Just my 2 cents.
 

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Discussion Starter #13
I'd start with measuring/comparing the length of the old belt with the new belt. Take into account some stretching and wear, but it shouldn't be that much longer. If the lengths match, then 9 times out of 10 it's the routing, or as mentioned the tensioner. Sometimes that actual belt has been changed mid production and doesn't show up in the manual/parts list.

Make sure you're not going around a post or guide that would make the new belt appear too short.

Just my 2 cents.

roughly how much longer do you think the old belt should be due to stretching? I didn't measure but I would say the old belt was roughly 4 inches longer than the new one is. I have the 42 inch deck, and I bought the 42 inch belt... maybe it takes a longer belt?
 

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Troy,
Can you find ant identification on the old belt?
 

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Discussion Starter #15
Troy,
Can you find ant identification on the old belt?
I will look when I get off work this afternoon. Im not confident as it was really worn, but there may be a visible number on there. That being said, the belt that was on it was not a john deere belt. Would you recommend that i put a different brand on it, or should I get the John deere one?
 

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roughly how much longer do you think the old belt should be due to stretching? I didn't measure but I would say the old belt was roughly 4 inches longer than the new one is. I have the 42 inch deck, and I bought the 42 inch belt... maybe it takes a longer belt?
I'd estimate no more than 1 inch longer for stretch. I don't have info on belt length/tractor/deck, so I don't know what length belt you need. If anything, take the old belt to the JD dealer, with your tractor deck info and see what he/she comes up with. Use the old belt as a comparison right at the counter and ask questions if there is much difference.

I'd prefer OEM belts. I have an old Wheelhorse, and the OEM belts seem to last longer ... why? dunno. :dunno:

Just my 2 cents and good luck.
 

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Troy, are any of the belt sheaves of other brand/make ?
 
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