Posted 9/29/2020 19:32 (#8521768 - in reply to #8521639) Subject: RE: Need help gear box Picture
Floyd County, Iowa
In the past, I've squirted some panther pi$$ on/in the couplings, then with a couple pipe wrenches (in your case 1 on each coupling), turn the couplings in opposite directions. Just don't go hog wild until they start to move a little.
May not be the proper method, but it worked for me on the shafts in a gearbox.