Posted by Bob on May 30, 2019 at 08:51:18 from (64.255.159.199):
In Reply to: 4010 pto posted by williamd on May 29, 2019 at 10:31:12:
Quoting Removed, click Modern View to see
Simple version is that 540 and 1000 stub shafts get swapped by bolting the desired one to the "hub" at the back of the tractor.
There's a spring-loaded shift collar inside the transmission area behind the clutch housing.
When you remove the stub shaft, it defaults to the rearward position, selecting one of the speeds (I don't remember which).
There's a rod extending to the "hub" that gets pushed on by one of the shafts, as you bolt it on, moving the collar forward.
If the splines are not matched so the collar can slide forward, and the bolts in the PTO stub shaft are tightened, a pin gets sheared that connects the shift rod to the shift collar.
One of the "stub shafts", either the 540 or the 1000 has a "pocket" in it so it doesn't push the shift rod forward, but the other does.
So, if you were to look at the stub shafts, the one with the "pocket" or blind hole in the center doesn't push on the shift rod, so that stub can't shear the shift pin.
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