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Discussion Boards > Active Subjects > Messages as Posted > John Deere Gator Forum

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05-27-2008, 14:59

Post: 154001

gacannon

Join Date: May 2008
Location: Georgia
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

Posts: 3

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Older Gator grinding gears

Motor pulley is full out and not sticking.
New belt.
The transmission pulley still rotates when engine is at very slow idle. Can not idle down any further.
you can stop the transmission pulley with your finger but its rotation is still enough to cause a grinding of the gears.
Belongs to elderly parents, the gear grinding is a problem for them.

The clutch pulley is fully disengaged, no question about it.

Can you move the engine a little to get some more belt slack.

The problem has grown worse over the years. Transmission is worn in and has little internal resistance friction.

Thought about shimming the driven spring pulley on the transmission to widen the stopped, fully extended position of the pulley.

Figure either move the engine back or shim the transmission pulley to give more slop.

There needed to be a brake to stop the input shaft to the transmission on this model. Bad design. I am sure people have this problem.

Otherwise its a good machine.

Takes nothing to spin the transmission input shaft so any friction on the belt is enought.

Any help appreciated. Figure someone might have an easy fix.

Bob, Retired Mech Eng.

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05-29-2008, 09:46

Post: 154050

gacannon

Join Date: May 2008
Location: Georgia
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

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Older Gator grinding gears

You are right about the idle. Get is slow enough and it will stop but its idling really slow and a little unstable.

Folks are in their mid 80's and things like gears grinding make them scared.

Thought about shimming the transmission pulley to make it more spread at idle to loosen the belt even further. Also thought about loosening the motor and see if it would move back just a bit to loosen the belt.

I bet when the transmissions are new, they have more internal friction and turn less freely. This gator has seen alot of miles on the farm and the trans input shaft turns absolutely free. Any belt friction and it will turn. Idle the engine up and it turns faster making for more grinding.

You help is appreciated very much.

Bob.

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