The D7 shaft should have the same spline couplings. It's just shorter because the D7 does not use the adapter.

It was last mounted on a D7E. I don't know if that makes any difference or not, I can't verify the spacer was used but have pictures of the D7E using this power unit. I removed my gear cover on my D6 and the shaft given to me when I bought it is too small to engage the splines. Unless I got the wrong shaft assembly the D7E splines might be a bit bigger than a D6 9U is.

That explains the special coupling shaft. The d7E is beyond the normal application range for the #25 9Dxxxx CCU.

Just my luck, the piece I have is not likely worth trading with anyone either, heh. That does explain a lot though, so I should expand my search for a D6 D7 winch coupler shaft too? The idea being the splined coupler is the hard part to find, and I can machine and weld to fit my needs.

Yes, on the D7 shaft couplings but only through the 17A series.

I have checked hub city, McMaster, Grainger and some online sources, 1.7 OD/16 spine is common spline size, the Cat part is not. Located a shaft for $275 plus shipping. How bad do you want to sell your part Old Magnet? Heh, heh. I know I can make one, just started driving piling on a new bridge job so my time is limited for a while. I guess it's like an old carpenter always told me "you gotta want it" to make it happen.

Around here a machinists time goes for about $115/hr and it's probably a good days work to knock one of those out.

Not to take away from the OP, but is there a CAT machine that uses a 2" OD, 15 spline coupler? I've been told that is the size that I need for my AC HD11b. Having a hard time finding that size anywhere. I'm hoping that if there was a CAT machine that used that size, it would expand my search area a bit!

Andrew

There are/were several AC HD adapter shafts but the HD11b is not one of them.
Some more less known coupling sizes....