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Farmall & IHC Tractors Discussion Forum
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Question for Hugh (and others) on TA

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61-4010

10-22-2006 03:56:19




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Hugh (or anyone else that wants to jump on)....I read the posts regarding the TA plowing and have a question for ya. For background, I recently purchased a 1466 and the TA low is out. I plan to have it replaced by an IH dealership for many reasons. But regardless, you noted free wheeling in low. Can you elaborate here? If you are in high 4 with the TA in low and start going down a grade, will the tractor just free wheel if in low TA? And that is what messes these up?

Just want to make sure I"m hearin" ya right. Gonna spend good dough to get this TA replaced and I don"t want to repeat it any time soon. Thanks!

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Hayfarmer

10-22-2006 09:28:24




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 Re: Question for Hugh (and others) on TA in reply to 61-4010, 10-22-2006 03:56:19  
When I first got my SMTA the low side of the TA was out. I used it on the high side for a year or so then I had to go in and replace the PTO disconnect and since it was split I decided to do another split and fix the TA. I have been really glad I did, on mine I replace the ramp and rollers, the clutch was ok. I have used it a lot especially running a baler to slow down when I hit a heavy spot. It has also been good when discing or plowing. I am glad I didn't got the elimination route. Think it was about the same price as fixing it. I think it depends upon how you use the tractor and if you don't have a TA you operate differently.

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the Unforgiven

10-22-2006 08:45:45




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 Re: Question for Hugh (and others) on TA in reply to 61-4010, 10-22-2006 03:56:19  
When the T/A went away so bad on my 1086 that it could no longer be used in high, I installed the T/A eliminator and could not be happier with it. The T/A was NEVER used, the handle had probably not been pulled two dozen times since it was new. The dealer replaced the first one at about 4000 hours, the second one was done at 8500. The only times this tractor was down was for one fuel pump, and being an early 10 without the water filter, it took an in-frame at about 6500 hrs. due to cavitation. And it is true that the T/A was never adjusted properly after our tractors were delivered, but you know what, neither was the rest of the tractor, and they are still servicable. I am one of those people who believes if there is a weak spot in an older IH, it IS the T/A. The T/A may have gotten a bad rap, but I think they do not deserve as good of a rap as the rest of the tractor. After decades of hard use and abuse the 300, 450, and 560, all original owners on this farm, can still serve, but not a good T/A in the bunch. I remember when I was away at school for a couple years the hydraulic pump on the 450 started leaking fluid into the crankcase so every couple weeks they would drain a couple gallons out of the pan and pour it back into the hydraulics! The pto is about shot now but it is still a really dependable tractor. Sorry I strayed from the original question a little, but since I missed out on the T/A debate on the last page I figured I had better jump in here and take a few punches myself.

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TomH in PA

10-22-2006 07:19:20




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 Re: Question for Hugh (and others) on TA in reply to 61-4010, 10-22-2006 03:56:19  
This is my understanding of it, correct me if it's wrong...

Tractors with a torque amplifier are in two gears at the same time, low and high. There is a clutch for each, so when you switch from high to low you are disengaging one clutch and engaging the other. If you move the lever slowly you're riding one clutch or the other or both, which of course will wear it out quickly.

The early TAs that Allen referred to had what's called a "one-way" sprag clutch. The engine could power the tractor forward, but when the tractor overran the engine (coasting downhill) the clutch slipped. This of course wears the clutch out quickly. IH replaced the sprag clutch with one that didn't slip while going downhill, but by then the TA had a reputation for failing.

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Allan In NE

10-22-2006 08:47:14




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 Re: Question for Hugh (and others) on TA in reply to TomH in PA, 10-22-2006 07:19:20  
Tom,

Both styles drive the low side thru that sprague and both "overrun" the sprague on the high side. Normal operation; doesn't hurt that sprague a bit.

Small style tractors use a planetary type reduction unit incorporating a conventional type "T/A clutch" to lock the driving members of the planetary up solid, to turn as one unit, which produces direct drive. When this T/A clutch is released, power flow is then thru the planetary giving a reduction and increased torque.

Large style tractors use a hydraulically actuated lever to switch between either a direct (straight thru) drive or a gear reduced constant mesh setup and they also incorporate a double hydraulic clutch(s) setup to prevent the freewheeling. These hydraulic clutch packs don't transmit power; merely hold the tractor back on de-acceleration.

Tractor is actually directly gear driven via the main clutch in both modes and in both styles of T/As.

Hope I got all that right. :>(

Allan

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TomH in PA

10-22-2006 10:33:15




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 Re: Question for Hugh (and others) on TA in reply to Allan In NE, 10-22-2006 08:47:14  
Sounds simple enough. Maybe now I'll go try to figure out how women think. Not.



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Allan In NE

10-22-2006 04:07:50




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 Re: Question for Hugh (and others) on TA in reply to 61-4010, 10-22-2006 03:56:19  
No, not on a 1466. They do not free-wheel; different design.

You're thinking of the small frame tractors like the 400, 560, 656, 666 & 686.

I wouldn't worry about your T/A. They are way tougher than folks let on.

Allan



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sd pete

10-22-2006 06:45:49




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 Re: Question for Hugh (and others) on TA in reply to Allan In NE, 10-22-2006 04:07:50  
That new Ta will last for years, Just dont use it for a brake when pulling heavy loads in road gear.



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