Posted by Janicholson on September 02, 2020 at 19:09:51 from (24.240.46.228):
In Reply to: Re: 806 update posted by rustred on September 02, 2020 at 18:54:23:
The big frame TA has three clutches, two of them are driven by MCV pressure directed by the TA lever to either engage the direct clutch (front), or the rear clutch TA holding clutch to prevent runaway down hill, but it is a weak clutch not designed for engine power at all, and a Sprag clutch (one way), which takes all the TA main body reverse rotation and transfers it to the housing. Just like a Mechanical TA in smaller tractors. If the front clutch fails, and bleeds off substantial MCV pressure it slips, forcing the TA main body to turn backward. This puts the power on the sprag clutch which has failed (it slips intermittently. In mechanical TA tractors, if the Sprag clutch fails, the friction disk dry clutch drives the TA at crank shaft RPM and the tractor remains operational in direct drive. If a front dry clutch fails in a mechanical TA, it will drive in TA reduction all the time, TA lever forward or back. If the sprag clutch also fails in a small frame tractor, it will not move. Jim
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