Charlie pretty much covered it. It is an underdrive unit. Direct drive is lever ahead as would give same gear ratios you have with out a TA. DD is driven through a 7 inch dry clutch very similar to any dry clutch and low range TA is a reduction through a planetery gear set. It utilizes a one way clutch mounted at rear of planet carrier commonly know as the ramp and roller that keeps carrier from rotating backwards. When the one way clutch fails it allows the carrier to rotate backwards, input going forward and output shaft stand still there fore tractor does not move. What usually happens is the rollers in the one way form a groove in ramp and therefore they cannot move out to lock (wedge) onto the carrier. Heavy oils in rear end also cause these rollers to stick much more so than lighter hy-transmission lubes. The tractor will free wheel when pulling ta lever back and like said is not a good thing to do at high rate of speed. Normal usage with free wheeling for a few feet at lower gears does no harm. Being a mechanic, of course we like to throw all the blame one can onto an operator if something fails, but truth is, they are basically wear items and they fail with use. That is what is on the tractor for though so use it and don't abuse it at they are fine. TLC goes farther than anything else on any piece of equipment. I have seen owners change fluids etc religiously and beat the heck out of their machines and have all kinds of breakdowns, and vise versa, seen operators rarely change fluids but handle everthing with kid gloves and they last forever. There is always a balance point.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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