Posted by Owen Aaland on February 11, 2010 at 19:23:21 from (65.165.246.14):
In Reply to: Farmall 400 TA questions posted by Pete@Pequawketfarm on February 11, 2010 at 17:20:29:
Nebraska Kirk said: (quoted from post at 22:34:02 02/11/10)
Owen, but the TA clutch is disengaged when the TA is in low. With the TA clutch engaged, there is no gear reduction through the TA. Maybe I am missing something but it seems to me that the same amount of torque is going through the TA clutch as the main clutch.
Ah, that is where it gets a little tricky. The power coming into the TA is on the sun (small input) shaft. It is meshed with the three planetary gears which are also meshed with the transmission input shaft. As the sun shaft rotates, the planetary gears are also forced to rotate. The planetary gears are fastened to the carrier by the three small shafts. The resistance of the transmission input shaft causes the planetary gears to try to turn the carrier instead of the them turning transmission input shaft. With the TA clutch released, as long as the ramp and rollers hold the carrier, the planetary gears will turn the transmission input shaft with a geared reduction in speed.
The TA clutch connects the sun gear with the carrier assembly. That give two paths of power transmission through the TA assembly, one through the sun gear to the planetary gears, the other through the carrier to the planetary gears. The force is split between them so that there is only about half the torque going through the TA clutch as there is through the main clutch.
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