A TA that is not adjusted properly will cause shafting problems. The TA contains a one way clutch that, along with the TA clutch, will keep the transmission input shaft from turning backwards. When you release the main clutch, if the tractor starts to go in the opposite direction, the TA will hold pressure on the transmission gears making it hard to shift. When the TA clutch is released the transmission input shaft is now allowed to rotate in the opposite direction releasing the pressure from the gears to allow them to be shifted.
A correctly adjusted clutch and TA will have the correct free travel on both clutch release bearings so that they are not turning when the clutches are released bu yet allow total release when necessary. The adjustment on the link connecting the two clutch release levers is critical to assure proper operation. The main clutch needs to be completely released before the TA clutch is released. When engaging the clutch the TA clutch must be fully engaged before the main clutch engages. These engagement points must be very close together but must happen in the correct order.
As far as free wheeling, with the TA lever pulled back the tractor should free wheel going down hill. This is because of the one way clutch in the TA. In the direct or forward position the TA clutch is also engaged and the tractor should not free wheel.
A properly operating TA should not free when when in direct drive. When pulling the TA lever is should move a couple of inches and then get harder to pull as the bearing engages the levers on the TA clutch pressure plate assembly. Before the lever is all the way back to engage the latch, that TA should down shift and the tractor will be able to free wheel. To check the adjustment link between the clutches face the tractor slightly uphill in first gear, TA lever forward. Slowly push in the main clutch. When the tractor stops, it should stay in place without rolling backwards. Pushing the clutch in a little more should allow the tractor to roll backwards. Releasing the clutch, the tractor should stop rolling backwards before it starts to move forward. If, when releasing the clutch, the tractor starts to move forward and then does an upshift as the TA engages, the connecting link is out of adjustment.
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