HELP-which hub is this?

[classicdmax 190]

i recently purchased an auxiliary hub from ebay to use as a hub pulling apparatus. once i got my existing hub removed (which came off pretty easy), upon examination, i noticed the slot for woodruff key was different. im not sure if this is a sign of wear and tear, or just a hub from a different model tractor. 

 

on the left is the recently purchased, right was existing hub removed from tractor. the numbers on back are the same...perhaps casting numbers. not sure

 

recently purchased hub

 

existing hub....as you can see the channel seems reamed out. to me this looks to be wear, but am unsure. if its not wear, why the hell would they do this as it seems it would leave potential slop in the connection from hub to axle shaft

 

for the helluvit, woodruff key...

 

 

[benji756 341]

I would say thats wear

[oldlineman 1,541]

Looks like wear to me too

[Ed Kennell 42,111]

Put the good new one on and use old worn out hub as the puller.

Add a second set screw 90 degrees from the existing one.

Edited November 17, 2016 by Ed Kennell

[classicdmax 190]

Thanks guys

 

ive seen a posting regarding a second set screw somewhere here before....just drill and tap I assume? Need I be concerned about the set screw deforming axle shaft at all?

[lynnmor 7,847]

I mill a flat for the set screw.  Of course an axle still installed would need a different approach.  You can install the hub and tighten the set screw enough to mark the location and then file a flat where the mark is.  Make the flat large enough to completely accept the set screw diameter.  Also, a spot face where the new set screw lock nut contacts the hub will help lock it.