Posted by Owen Aaland on May 16, 2012 at 19:57:53 from (216.47.35.152):
In Reply to: How does a TA work? posted by Senator on May 16, 2012 at 18:58:07:
The first style of TA used a planetary gear set with a ramp and roller over running clutch for the lower speed. They used a dry clutch, like the main clutch only smaller, to lock the complete assembly together to provide direct drive to the transmission. When in the TA position they will free wheel when going downhill.
The TA in your tractors use two pair of gears for different ratios with the upper gears on the input shaft and the lower gears on the speed transmission counter shaft. In the TA or lower speed position there is a one way sprag clutch that locks up between the front upper gear and the input shaft. It also has a hydraulic lockup that provides some lockup but is mainly there to keep the tractor from free wheeling. In the direct, higher speed, position there is a hydraulic lockup clutch to lock the rear gear to the input shaft. In this position the front gear will driven from the counter shaft and will be turning faster than the input shaft. The sprag will release to allow the gear to spin on the input shaft.
The TA works by giving you two different speeds on the speed transmission counter shaft. In the TA position the power comes in through the input shaft from the clutch and is transmitted to the lower shaft and then drives the rear upper gear in the TA at a speed less than then the input shaft speed. 4th gear is accomplished by engaging the 3/4 sliding gear on the upper speed transmission output shaft with the rear gear in the TA assembly. The other three speeds are achieved by engaging different upper shaft gears with mating gears on the counter shaft. In the Direct Drive position the power comes in the input shaft and the rear TA gear is locked to it. In 4th the power is just transmitted to the output shaft with no speed reduction in the speed transmission. The other three speeds have the power transmitted from the rear gear to the counter shaft and then back up through the selected gear set.
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