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112 Variable 'need for speed' adjustment

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John

04-04-2002 03:27:10




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I recently aquired a 1968 (according to the dealer) JD 112 to tug trailer loads of stuff around at my cabin. I don't have a manual and I'm trying to figure out how to adjust the variable speed drive. The problem is that I don't reach anywhere near top speed unless I complete the variator pully movement by pulling the clutch pedal towards me to a 90 degree position to the deck while I'm moving (yes the variator lever is all the way forward when I am doing this). When I pull the pedal towards me the tractor will accelerate. If I let go of the pedal it will eventually ease forward a few inches and settle in at somewhere much less than top speed.

This tractor was given to me and except for the $35 seat brackets (each) I had to buy it is in great shape. I am pretty pumped up about getting the old girl moving again.

A prevous post said something about an adjustor plug on the right side of the tractor. I've messed with the large 3/4 inch bold recessed in the right side below the variator lever but got no results. I'd appreciate any detailed info on what I'm supposed to do with it. Thanks for your help.
John

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Steve from MO

04-04-2002 11:18:19




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 Re: 112 Variable 'need for speed' adjustment in reply to John, 04-04-2002 03:27:10  
I have the manual for my 210. It's the same procedure. If replacing the spring doesn't fix the problem, email me and I can fax you the procedure. I don't have the manual scanned though, and it's more involved than complicated.



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phil

04-04-2002 07:49:04




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 Re: 112 Variable 'need for speed' adjustment in reply to John, 04-04-2002 03:27:10  
John, as you learned, there is an adjustment on the right side. You won't be able to adjust it by turning it in or out, you will need the adjustment procedure that is in the book. It fixes the problem that you have (unless the spring is broken, but usually it's the adjuster). I sold mine a couple years ago so i can't post the procedure, sorry. The variable speed drive is load sensitive - it will gear down when it senses a tractive load. So when you pull a drag, heavy trailer, etc, you will sense it gearing down by itself, that's normal.

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DPOST

04-04-2002 06:25:40




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 Re: 112 Variable 'need for speed' adjustment in reply to John, 04-04-2002 03:27:10  
John

From what you describe, it sounds like you have a broked return sping. Somewhere on the under side near the back of the tractor lives a spring that pulls the foot pedal back. The spring is about 6 inches long and 1 inch in diameter. The hooks tend to break where they enter the coil. The replacemet spring is about $12 and is a different design so the hooks are less likely to break off. The spring should be available in any good JD lawn and garden shop. The shop I deal with actually had one in stock.

Also for what its worth, I got by one season with a broken spring by using big bungie cord to pull the foot pedal back. I hooked one of the bungie to the foot pedal ran it over the to the axel housing and attached the other end to the draw bar. Ugly but it worked.

Take care
D.D.Post

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