U-joints appear in 3 locations on the shaft. The first is at the back end, right where the quick-connect slips on to the pto output shaft. This is at the lower right of the picture I posted in response to jm.
The second is the "double cardan" joint. This is just behind the hexagonal "telescoping" shaft that slides through the two special-purpose bearings on the snowblower front mount bracket. These are the two triangular housings at the upper left of the shaft in the picture I posted for jm.
The third is on the *other side* of these special-purpose bearings. The end of the hexagonal shaft is splined, and here there is yet another u-joint that slides onto these splines (not shown in the picture).
The most recent test was with the snowblower and this outer-most u-joint removed. Basically just spinning the PTO shaft in its bearings--it vibrates like crazy!
There may very well be problems with the splines and the forwardmost u-joint, but I'm not even there yet!
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