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Allis Chalmers Discussion Forum

Torque clutch High Low Shift

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Phil H

07-16-2007 11:21:58

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I was wondering, just what was the "torque shift" High Low all about? AC gave it an 8 speed configuration with the 4sp + H.L. and 2spd. in Reverse. It's easy to see how they came up with the numbers but did you have to push the clutch in to shift from High to Low, because it looks like it is hydrolic operated. I recently looked at a 190xt with a new clutch, and it would surge ahead or back when in neutral and the H.L. shift in Neutral also. This actually loaded the engine down, and had to be held with the brakes. I can't believe AC made this tractor to behave like this. It looks like something is either out of adjustment or going bad. Anyone have experience with this?...thanks...Phil

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Jerry Coulter

07-16-2007 14:52:06

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 Re: Torque clutch High Low Shift in reply to Phil H, 07-16-2007 11:21:58  
There is something badly wrong with a 190XT if it wants to go while the tranny is in neutral. And the hi-low is engaged by hydraulic, can be shifted on-the-go, and tends to creep in neutral if the tranny is in gear.

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John (MO)

07-16-2007 14:48:15

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 Re: Torque clutch High Low Shift in reply to Phil H, 07-16-2007 11:21:58  
If it is adjusted properly it will stop pulling when the power director is in neutral as soon as the fluid warms up.

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07-16-2007 13:22:03

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 Re: Torque clutch High Low Shift in reply to Phil H, 07-16-2007 11:21:58  
Yep thats just the nature of the beast. The D-17 was also bad about doing that and is common with all of them with that set up. So yep its normal

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Tramway Guy

07-16-2007 12:54:00

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 Re: Torque clutch High Low Shift in reply to Phil H, 07-16-2007 11:21:58  
Yes, the tractor might tend to 'creep' with the transmission in gear and the Power Director in neutral which is normal; but if it creeps with the tranny in neutral, there is definitely a transmission problem. Most likely a bearing or shift collar hanging up somewhere between the input and output shafts. There might be other places, but it shouldn't happen.

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Phil H

07-16-2007 13:46:06

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 Re: Torque clutch High Low Shift in reply to Tramway Guy, 07-16-2007 12:54:00  
I can see the torque shifter causing things to surge when the hydrolic fluid is cold or until everything gets warmed up with use, but when the main trans. is in neutral, that just doesn't seem right. Could you shift the torque lever without using the clutch? .......thanks...Phil H

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Jack a

07-17-2007 03:20:44

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 Re: Torque clutch High Low Shift in reply to Phil H, 07-16-2007 13:46:06  
Yes you can but in road gear I wouldn't shift down without braking at the same time and throttling down. The PD is about the most reliable setup in it's day.

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