2000 Posts and climbing!!!
Join Date: Feb 2012
Re: Broken Attachment Bolts on older JD 4030
And, if you get drilled all the way through, put some decent penetrate in through that hole, while drilling up through increments, and let it soak back through the threads from the backside. My favorite is a home made brew of a 50/50 mix of Acetone,and ATF. Works better than anything I've bought of the shelf, including KROIL. If you get of side a bit, just drill until you get close to the threads in the casting. Then take a center punch, or a very small chisel, and collapse that side in. That little bit of heat while drilling my expand/contract the bolt enough to let the penetrate creep to the front. Once you are as big as you can go, you can take a pretty decently pointed center punch, and turn it in the direction to turn it out.
Once you have it out, if you have a tap large enough you can chase the threads,and clean them out. If not, take a same size bolt, and make a couple cross cuts across the threaded end for 1/4" -3/8" making your own thread chaser.
And, I'm pretty much
a stickler for using never-seize on bolts like this. You never know when you'll need to take it apart, or have this happen again.