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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Hough transmission

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Author  [Modern View]

11-08-2012 20:11:32

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If your convert er temp goes up when hill climbi ng and returns to normal when not, then I would think it is getting the proper oil supply. If it were hot all the time that would be different. The converter must be full of oil all the time, if it was straved of oil and not full it would soon destroy itself. I would go back to the transmission control. There should be ports for checking the pressure on each clutch pack. Put gauges on all of them and see that they go to full pressure when in use and turn to zero when not. You may have a leak that allows partial pressue to a clutch when it should not have any causing an internal drag in the transmission. That is the only thing I can think of that would cause your strange problem.

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Bill in il

11-09-2012 06:42:16

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 Re: Hough transmission in reply to DGH, 11-08-2012 20:11:32  
Ok so you have me almost convinced its not in the converter. I need to let the machine sit outside overnight and see how it respnonds to the transmission test again. The thought about a internal drag of some sorts sounds interesting. That oil is used for holding the clutches together but what else are they used for inside the transmission? Anything? I need to find another gauge lower than the 5000 psi one i have before I can test that.

I also see there used to be an airline connected to the top of the transmission what is the purpose of that? It's not the airline for the transmission disconnect or the one connected to the brake pedal.

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Dr. Walt

11-11-2012 05:40:58

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 Re: Hough transmission in reply to Bill in il, 11-09-2012 06:42:16  
Hi Bill, this problem of yours has just about got me stumped. You stated: "I also see there used to be an airline connected to the top of the transmission what is the purpose of that? It's not the airline for the transmission disconnect or the one connected to the brake pedal." Is there a "vent line" fitting or a "pressure" fitting? If it IS a pressure fitting, have you tried applying air pressure to it to see what happens - both at rest & while operating?

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11-09-2012 09:54:16

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 Re: Hough transmission in reply to Bill in il, 11-09-2012 06:42:16  
The control oil pressure is generaly used for operation the drive clutches and pressure lubrication of bearings etc. Now I have not worked on the one you have, so don't know what the air would be used for. Maybe a holding brake when the transmission is in neutral? You need to get a manual for that machine. But in my experience you have an unusual problem.

Those types of transmissions usually have a foward and reverse clutch pack and one for each speed. So for any speed you need to operate one of the direction clutches and one of the speed clutches and all the others are off. I once found a piece of rubber from the inside of a hose in the valve body. That caused erratic opertion and that was really hard to find.

It sound like yours does not fully go into gear, so that is why I think it is a control issue.
When it is slugish does the engine rev freely and the machine not move or is the engine loaded and the machine not move?

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