Jump to content
ri702bill

Broken hub setscrew removal ??

Recommended Posts

ri702bill
Posted (edited)

All:

Last fall as I was switching the summer turf tires for the loaded ones with chains for plowing, I checked the tightness of the single setscrew over the Woodruff key on the C81. I backed off the jam nut and to my surprise, about 2/3 of the screw came out with it (probably a parting gift from the previous owner). The remaining portion is tight - I am in the process of drilling the top half thru with a 3/16" carbide drill so I can reinstall it and use it as a guide to drill the lower portion. I plan to try an Easy-out after I soak the screw with PB Blaster.

1. I do not want to damage the hub.

2. I have ordered new 1" long square set screws.

3. If I damage the Woodruff key, I'll replace it.

Has anyone run into this and had good success in removing the remaining portion so the hub can be removed??

Bill

Edited by ri702bill

Share this post


Link to post
Share on other sites
 
pfrederi

No experience but I will watch your progress with great interest.  i broke an alloy steel set screw off flush on one of my chargers....:angry-banghead:

Share this post


Link to post
Share on other sites
 
8ntruck
Posted (edited)

A left handed drill bit might help. If it catches the stub of the set screw just right, it will help loosen it, or maybe back it out.

 

Good luck.

Edited by 8ntruck

Share this post


Link to post
Share on other sites
 
ri702bill

So far - partial success. I was able to drill a hole thru the broken off portion using a carbide center drill and 3/16" carbide drill bit in the lathe. I then used it as a guide to use the 3/16" bit to drill a full diameter into the part in the hub. I have a couple of TiN coated left handed cobalt drill bits on order that should arrive today - more to follow .....

Bill

  • Excellent 2

Share this post


Link to post
Share on other sites
 
ri702bill

Success!!!! It took a bit of doing and a second set of eyes (and tools) but I was able to drill thru the screw and into the key. My son suggested I try what he does with broken lock bolts. I supported the hub by the small diameter with wooden 4x4's and he hammered a Torx T27 bit into the screw. Next he used his cordless impact drill / driver and it backed right out.

Lessons learned:

I was able to drill easily with the 3/16" Tin coated left handed cobalt bit - I could not then open it up to 1/4" with the next bit, it just ruined the edge of the flutes. These bits need a full bite to work.

In hindsight, the left handed bit worked, but I do not feel it freed it up at all.

I tried a couple of "Easy-outs" with no success - the screw is harder than the tool and could not get them to bite.

Next up - remove the hub and replace the Woodruff key.

Bill

20210420_133201.jpg

20210420_133206.jpg

  • Like 1
  • Excellent 2

Share this post


Link to post
Share on other sites
 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...