Posted by Janicholson on January 28, 2010 at 20:32:00 from (64.61.211.189):
In Reply to: PTO posted by Doug Woody on January 28, 2010 at 19:37:43:
There are 4 basic PTO realities. 1) Early PTO systems in most cases were driven from gears in the power train after the primary engine clutch. These are PTO at its most crude. 2) Some mid century tractors had a system that put a secondary clutch after the transmission (usually after the differential, and before the bull gear reduction final drive. This allowed the tractor to be stopped and the PTO to continue to power the attachment. It also was still turning all the trans gears, so shifting gears was not reasonable when the differential clutch was used. A major improvement, but no shifting without clashing unless the main clutch was used. 3) A two stage foot clutch was offered as well by some manufacturers (and still can be found on new tractors of some makes) this clutch stopped the tractor with the main clutch when the pedal was about 1/2 way depressed. Pushing it all the way down disengaged the PTO. This was and still is very useful, but not independent from the operator control with the pedal. 4) a IPTO or independent PTO, is driven by a separate shaft from the engine and has its own built in clutch and usually a brake as well. The control lever is moved from stop to run with these systems, and they can be far more handy than the above for most applications. JimN
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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