Re: Another TA Question

Posted by K.B.-826 on September 07, 2006 at 19:46:26 from (68.115.95.87):

In Reply to: Another TA Question posted by TSH on September 07, 2006 at 17:42:10:

Like Randy says, the hydraulic TA used on the 706 and bigger tractors does not have a planetary like the SMTA-686 sized tractors. Imagine a simple two-speed transmission. It has a top shaft and a bottom shaft. The engine turns the top shaft, and the bottom shaft is the output. One gear on the top shaft meshes with one gear on the bottom shaft to provide the direct drive ratio (lever ahead). The other gear on the top shaft meshes with the other gear on the bottom shaft to provide a reduction (lever back). When the lever is ahead, the MCV valve routes oil to a hydraulic clutch pack, which locks the direct drive gear to the top shaft. When the lever is pulled back, the clutch pack disengages, a mechanical one-way sprague clutch locks the low gear to the top shaft, and a hydraulic brake pack engages to keep the sprague clutch from overrunning, which would cause the tractor to freewheel downhill. So yes, power flows through the TA unit at all times. Always shift as fast as you can to avoid slipping the clutch pack. Some of the late 86 series and all of the 3088 series use an electric switch to power a solenoid which moves the shift valve to provide an instant shift.

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