Re: 766 TA operation questions

Posted by K.B.-826 on September 29, 2004 at 18:54:48 from (209.163.30.93):

In Reply to: 766 TA operation questions posted by Randymes on September 29, 2004 at 16:31:12:

The TA is basically a two-speed powershift. There are two different types of TA's, the mechanical, and the hydraulic. Bigger tractors like your 7 have the hydraulic TA. It is located between the engine clutch and the speed transmission. It is made up of the input shaft, a hydraulic clutch pack, a sprag clutch, and two different sized input gears. While the lever is ahead, the hydrualic clutch pack is locked up, locking the faster input gear to the input shaft, giving you direct drive. At this time the sprag clutch overruns, since that's what it is, a mechanical overrunning clutch. When the lever is pulled back, the hydrualic clutch pack disengages, and the sprag clutch is now able to transmit power. The sprag clutch is coupled to the slower input gear, which gives you the gear reduction. A hydraulic brake pack prevents the sprag clutch from overrunning at this point, so it is safe to travel downhill with the TA back, unlike the mechanical TA tractors, which will freewheel. The TA can be shifted on the go, under load. It is meant to help you pull through a tough spot by pulling it back, or start a heavy load by starting with the lever back and then shifting it ahead. It can also be used to give you a slower speed in each gear, say baling hay Low 3rd is just too slow, and Low 4th is too fast, use Low 4 with the TA back. It is not meant to be used as a brake, like coming in off the road with a full chopper box behind you and pulling back the lever for engine braking. This will fry the brake disks pretty quick. Don't be afraid to use it. The worst thing for it is leaving it in direct all of the time, as the sprages will always be overrunning and wearing away.

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• Re: 766 TA operation questions CEB 11:47:15 09/30/04 (0)

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