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Farmall & IHC Tractors Discussion Forum
:

684 has Low side TA only

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wolfy

02-27-2004 21:20:52




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I have a 684 that doesn't shift into high torque. If you do throw lever to high side, it will free wheel down hill. So, I've just been running on low side (still has 8 speeds about equivalent to the 3020). (1)Am I doing it harm staying in low torque; and (2)Might it be an easier-than-I-expect fix? Thanks for advice.




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Bernard le mécano

02-28-2004 16:59:02




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 Re: 684 has Low side TA only in reply to wolfy, 02-27-2004 21:20:52  
Hi Wolfy, check TA pressure before, 125 PSI. A small plug on the cover, under the front transmission, check for a broken reief valve spring, large plug on the same cover, or stuck relief valve. Drain the oil and remove the cover, check O rings on pipe, remove pump and plate then check gasket under the plate. May be broken seals rings on TA shaft.

Bernard le mécano Québec Canada



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wolfy

02-28-2004 18:05:25




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 Re: Re: 684 has Low side TA only in reply to Bernard le mécano, 02-28-2004 16:59:02  
Thanks, Bernard. Good info.



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JB

02-28-2004 10:29:40




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 Re: 684 has Low side TA only in reply to wolfy, 02-27-2004 21:20:52  
Hi I have been told by an IH mechanic that the Hi side of the TA is controlled by a hydraulic clutch run by a separate hydraulic pump that runs off the PTO shaft. The Lo side is a mechanical sprag clutch with a friction disk to prevent free wheeling on down slopes. The separate hydraulic pump can be accessed thru the inspection hole in the bottom of the torque tube. This pump gets its hydraulic oil from the transmission and returns it into the line that goes to the oil cooler in front of the rad. There is a check valve inline with the Hi clutches to hold the hydraulic pressure on the clutches when the engine is off to prevent run away on a slope. This valve is sometimes at fault being stuck or clogged.

The function of this hydraulic pump can be checked with a pressure and flow meter by tapping into the hydraulic pipes by the left brake pedal and under the battery box.

I have been doing some research on the 684 TA as my brother's 684 TA has started to:
1) in Hi not hold on hills with engine off.
2)sometimes in Lo if you go down a small incline when you get to the bottom it stops and you must depress and release clutch to start again.

I believe the only harm you will do running in Lo all the time is wear out the friction disks, if you go down hills with heavy loads behind.

There are a few IH mechanics that contribute to this board and can added some additional advice.

Lets us know the out come.

Good luck
JB

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wolfy

02-28-2004 13:07:20




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 Re: Re: 684 has Low side TA only in reply to JB, 02-28-2004 10:29:40  
Thanks, JB. Good info.



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