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What does TA in postings mean

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novice

06-18-2003 08:16:46




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When looking through classifieds and photo postings I see the term TA discussed when describing tractor features & condition. Does this refer to transaxle or something else??




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Joe Evans

06-19-2003 09:04:09




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 Re: What does TA in postings mean in reply to novice, 06-18-2003 08:16:46  
The TA acronym is for "Torque Amplifier" not "Power Amplifier", and the ratio increases to 1.48:1 (for my tractor) when the lever is pulled in. My 460's TA does zippo when engaged (or should I say disengaged?). It will be splitsville this winter for the old gal.



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New_2_Oliver

06-19-2003 05:13:20




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 Re: What does TA in postings mean in reply to novice, 06-18-2003 08:16:46  
Many companies offered a similar device. In Massey Ferguson it was the Multi-Power. For John Deere it was called the Over-Under. Probably others but those are the obvious.



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Mike (WA)

06-19-2003 08:23:17




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 Re: Re: What does TA in postings mean in reply to New_2_Oliver, 06-19-2003 05:13:20  
And Oliver's was called Hydra-Power (their three speed on the bigger, later tractors was the Hydraul Shift). The neighbor had a JD 2020 we borrowed often, and he called the feature the turtle-rabbit, for the pictures depicting fast and slow ("go to turtle down in that corner- its pretty heavy clay"). There is no truth to the rumor widely circulated at the time that the picture designation was in deference to the limited reading abilities of many JD owners.

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paul

06-18-2003 09:58:11




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 Re: What does TA in postings mean in reply to novice, 06-18-2003 08:16:46  
It's mechanical on the older IH tractors around here....

Just a hi/lo lever so you double the number of gears on the basic IH 5 speed.

They tend to wear out kinda quick, you often lose the 'lo' part of it. But relatively simple & chaep to rebuild.

--->Paul



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novice

06-19-2003 05:33:43




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 Re: Re: What does TA in postings mean in reply to paul, 06-18-2003 09:58:11  
Paul:
If you buy a tractor with the TA not working, does the tractor have to be split to fix it?



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novice

06-18-2003 10:15:11




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 Re: Re: What does TA in postings mean in reply to paul, 06-18-2003 09:58:11  
Paul,Scott, RAB,G Taylor:
Thanks for all your replies.--



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RAB

06-18-2003 08:38:42




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 Re: What does TA in postings mean in reply to novice, 06-18-2003 08:16:46  
Hi Novice,
Generally Torque Amplifier wrt hydraulically or electrically activated gear splitter on tranny. Allows a drop in speed, with resultant increase in power to drive wheels, without having to lose momentum while changing to a lower gear using the clutch and gearstick (as per the normal alternative on tractors of the era).
Regards, RAB



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Scott(TN)

06-18-2003 08:32:12




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 Re: What does TA in postings mean in reply to novice, 06-18-2003 08:16:46  
Refers to a "torque amplifier" found in IH tractors. The TA is used to reduce the gearing in the trans thus offering more power.



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G Taylor

06-18-2003 08:39:57




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 Re: Re: What does TA in postings mean in reply to Scott(TN), 06-18-2003 08:32:12  
The TA doesn't make more power. It increases rear axle torque as it reduces rear axle rpm.



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RAB

06-18-2003 14:31:50




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 Re: Re: Re: What does TA in postings mean in reply to G Taylor , 06-18-2003 08:39:57  
On changing down, the engine revs will rise (almost) instantaneously there may well be a large increase in power available. As the axles are not meant to slow down (anymore) ie. the splitter helps to maintain your speed when the going gets tough, the only way to increase torque at the drive wheels is to supply more power. Also depends on the power and torque curves for the engine, and where it's at on these curves when the lower ratio is selected! Kinda starts to get a bit overpowering for a novice, maybe. So I suppose we were trying to keep it simple.
Regards, RAB

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buickanddeere

06-19-2003 07:16:50




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 Re: Re: Re: Re: What does TA in postings mean in reply to RAB, 06-18-2003 14:31:50  
If looked at strictly in the aspect that gearing down with the TA will allow the engine to maintain it's rated full rpm HP rather than lugging down. Then the power has just maintained at the same level, no increase or decrease. Ground speed has slowed but applied axle torque has increased. Gearing down to pull a heavier load does not "add" power. It just performs the same amount of "work" at a slower rate with a higher torque/thrust/pressure etc.

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RAB

06-19-2003 08:22:09




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 Re: Re: Re: Re: Re: What does TA in postings mean in reply to buickanddeere, 06-19-2003 07:16:50  
Look at your power curve for the engine. The power output at higher rpms generally goes up. Changing down using the TA allows SAME axle speed at higher engine rpm, so increase in axle torque does not come from a slowing axle, but from more power from the engine ie it is not now lugging down. Come on you can't have it both ways. You are claiming no more power available even though the engine revs have risen and that ground speed has slowed, when the whole idea of the thing is to stop it slowing any further. I rest my case!!

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paul

06-19-2003 10:26:49




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 Re: Re: Re: Re: Re: Re: What does TA in postings m in reply to RAB, 06-19-2003 08:22:09  
My 300 slows down every time I put it in low range. If you are lugging the engine down lower than that in high range, you have bigger problems.

Power is a funtion of time & hp. There is very little change on these old gas engines on the power curve. You are slowing rpms (of the rear axle) & increasing torque. Power remains pretty much unchanged, with minor differences in torque curve & friction differences.

I think you're getting kinda confused here. You can't slow the gear ratio & increase speed, don't know where you are coming from. We increase _torque_ at the expense of speed - power remains basically constant.

All my work gets done at the drawbar when discussing the TA, so ground speed is what we are talking about here. Engine speed is also pretty much unimportant here, which may be tripping you up? Slow down, and increase pulling ability. Work or power produced remains the same.

--->Paul

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buickanddeere

06-19-2003 14:20:47




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 Re: Re: Re: Re: Re: Re: Re: What does TA in postin in reply to paul, 06-19-2003 10:26:49  
I think what RAB is going on about is that " his tractor at "peak HP crankshaft rpms in TA low" is making more power than it would "lugged to peak torque rpm crankshaft rpms with the TA at high speed". To say however a tractor, truck what ever has more power the lower it's geared down is just an old wives tale. Power is a measure of doing work (force x distance) over a period of time. Gearing down does the same work or power. Just more thrust,pull,pressure at the slower rate of travel.

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