Re: 826 Problem

Posted by K.B.-826 on February 22, 2006 at 17:56:17 from (68.115.111.89):

In Reply to: 826 Problem posted by Donny on February 22, 2006 at 10:33:19:

Sounds like you didn't get the dump valve set right. The purpose of this valve is to dump all the oil pressure out of the TA circut when the clutch pedal is pushed down, disengaging the direct drive hydraulic clutch pack. Now, without going into detail, due to the way the TA works the mechanical sprauge clutch for TA range automatically locks up whenever the input shaft is stopped and the tractor is trying to roll backward. Since your Direct Drive clutch is not being disengaged, it creates the effect of being in Direct Drive and TA at the same time, and just like being caught in two gears at once, this binds up the whole transmission, making shifting hard. To prove this, next time you find yourself in that situation, pull the TA lever back. Doing so will disengage the DD clutch and unbind the transmission. Now, to adjust the dump valve, first get your transmission oil pressure light working. Whenever the light is out and the TA lever is ahead, the DD clutch is engaged. Adjust the dump valve to the point where the oil pressure light goes out just before the main clutch starts to engage as you let up the clutch pedal. Don't adjust it to the point where the main clutch starts to engage before the DD clutch, or you will get very harsh, jerking starts.

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