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Farmall & IHC Tractors Discussion Forum
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TA link

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Author 
Gatz

09-25-2005 19:51:32




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I'm an AC person, but have a question for IH fans.
Today I went to a tractor show near Omaha and was asking som people about the short link that goes from the main clutch bellcrank to the TA bellcrank on the left side of the torque tube. This was on a 450, but I think it's common to a lot of 50' and 60's IH tractors.
(I used to run an anhydrous applicator behind a 560D for my cousin in the mid 60's)
The link is about 8" long and has a yoke on either end. The end that goes to the TA bellcrank is slotted to allow some free movement.
It was obvious that when in under-drive, the link came into play when the foot clutch was used.
However, in direct drive, the link didn't do anything because of the slotted end.
One person said that the purpose was to allow easier shifting of the main transmission by releasing some of the load on the gear train. (?)
Another guy said that if the link was not adjusted right, it would be very difficult to get the main transmission out of whatever gear you had it in.
Everyone agreed that the adjustment was crucial.
Can anyone shed anymore light on this subject?
Are the explanations that I was given close ?

Thanks in advance.
Gatz

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the tractor vet

09-26-2005 10:16:38




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 Re: TA link in reply to Gatz, 09-25-2005 19:51:32  
The short link is to release the T/A clutch when in the direct drive posision this releases the binding that goes on when in the high side because of the sprag .



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Nat

09-26-2005 05:44:01




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 Re: TA link in reply to Gatz, 09-25-2005 19:51:32  
One thing I do know is you can't shift these tractors if the TA is out of adjustment, period.

The TA unit is a planetary gearbox that either spins as a whole unit in direct drive, or is held in place so the gear reduction can do its work with the TA lever back. The way its designed, having the gearbox held in place prevents the transmission from turning, so you can't shift. That extra linkage releases the gearbox so the transmission can turn free, and you can shift.

At least that's how I understand it...

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