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Garden Tractors Discussion Forum

x320 John Deere throwing drive belt

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dan newberry

04-14-2018 19:25:05




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This message is a reply to an archived post by dan newberry on November 17, 2016 at 13:14:37.
The original subject was "Re: x320 John Deere throwing drive belt".

Just an update for future forum searchers...

The reason the drive belt comes off the x320 JD mower is... the parking brake releases a *lot* of tension off the drive belt, and with the engine at higher rpm's, the pulley just sheds the belt (at the engine).

To prevent this from happening shut the engine off *before* mashing in the parking brake. You do have to press the parking brake before starting the tractor, but of course the rpm's won't be at max, so there shouldn't be an issue there.

In any event, the belt throwing problem is not the belt itself, and it's not the belt guides. We installed a new belt from the John Deere dealer, and inspected and ensured that every one of the belt guides was properly in place and adjusted, and pulleys were not bent or knicked.

It's the parking brake... shutting the engine off at high rpm after locking that parking brake has the propensity to throw the drive belt.

I hope this helps others avoid this pain in the neck issue. :o :)

Dan

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jeffcat

04-16-2018 09:04:13




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 Re: x320 John Deere throwing drive belt in reply to dan newberry, 04-14-2018 19:25:05  
I would still guess that a belt guide is missing or positioned incorrectly. Had trouble with a Simplicity years ago where a bolt fell out that held a little bent up wire guide for the transmission drive belt. When you pushed the clutch in the belt would hunch it's back aroubd the pulley and the tractor would try to stay in gear. Total pain in the bunns till I figured it out.



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ed will

04-15-2018 12:11:34




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 Re: x320 John Deere throwing drive belt in reply to dan newberry, 04-14-2018 19:25:05  
Hi, would it help if you idle the motor before putting the park brake on. I always do that although none of mine are JDs. Ed Will Oliver BC



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ed will

04-15-2018 10:36:28




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 Re: x320 John Deere throwing drive belt in reply to dan newberry, 04-14-2018 19:25:05  
Hi, would it help if you idle the motor before putting the park brake on. I always do that although none of mine are JDs. Ed Will Oliver BC



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dan newberry

04-15-2018 14:20:11




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 Re: x320 John Deere throwing drive belt in reply to ed will, 04-15-2018 10:36:28  
Ed, that does seem to help a lot. We have a few different folks who use this mower and it's hard to police everyone, but I do think you're right, dropping the idle would help.

I think the design would benefit from an additional belt guard closer to the front pulley (the one on the engine's crank).

Dan



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dan newberry

04-14-2018 19:34:26




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 Re: x320 John Deere throwing drive belt in reply to dan newberry, 04-14-2018 19:25:05  
I should mention... there is *probably* some way to adjust the twin tensioning pulleys on the drive belt, which may help this belt throwing issue. I couldn't see any way to do it while I was under my mower, but that doesn't mean it can't be done, I may have just overlooked it.

It wouldn't seem likely that John Deere would produce this mower with such a glitch... if I figure out a way to adjust the tension on the drive belt, I'll post back.

Dan

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