They are a lock nut if memory serves me right. I had the one on the other side off on my 6620 when I rebuilt the header clutch. I know I put a new one on when I reassembled it. Seems like I engaged the separator with the motor off and maybe used a bar to to keep it from turning then used a 3/4 drive socket with a cheater bar. I do remember it was very difficult to remove. Don't remember the torque but they need to be tight when you reinstall.
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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