Cub 125 PTO

No.

You have to disassemble the unit to install the clutch disk. There are 6 set screws that need to be removed before you slide the PTO assembly off the shaft. I would soak the screws with PC Blaster before attempting to un-screw them. It takes a 1/8-inch long handle allen wrench.
 
Make sure your set screw heads are clean before you start so you can properly insert the allen wrench fully in the head. If you don't you can easily strip the head and you will have to use a drill to remove the screws and will probably ruin the clutch in the process.
 
You need a manual to learn how to get the clutch off unless youalready know how. There is a bearing with a eccentric lock collar that has to come loose.
 
The set screws are in 3 different holes spaced around the hub, they are small hex allen wrench, one on top to lock the bottom screw, 6 total. You can then pull the clutch off.
 

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