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Re: HELP! 826 Hydro tranny trouble!


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Posted by Owen Aaland on May 13, 2011 at 14:52:43 from (216.47.32.42):

In Reply to: HELP! 826 Hydro tranny trouble! posted by tobyfloyd61 on May 12, 2011 at 17:56:42:

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Cap the two lines coming out of the transmission. You will need two 1/4 inch flare fitting caps. If you can find steel caps that is best. Steel ones should be 37 1/2 ° flare which is what the tractor uses. If all you fan find are brass they may work n\but most likely they will be 45° and may fail as you can develop pressures in excess of 5000 PSI.

Capping the lines eliminates all the controls except the lever. That is a good test to see whether the problem is inside or outside the transmission housing. Make sure you have enough room around you so that you can stop by shutting off the engine if you have to.

It is kind of strange that the Foot-N-Inch valve did not stop the tractor. It's function is to control the pressure at which the high pressure relief valves open. Depressing the pedal results in both high pressure valves opening and the tractor will stop. Normally any failure results in the tractor stopping. I would lean toward servo problems since the pump servo controls both forward and reverse functions. The motor servo only controls the speed in the upper forward range.


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