I don't ever remember needing to change the step sheaves on our 80. Though all we combined were small grains (oats, wheat, and barley)so it would depend on what your harvesting. The sheaves, if I remember right were arranged as opposite cones; small end lined up with big end on the other sheave. Had three steps if I remember. For gib key removal you need to bump the sheave back slightly on the shaft then the gib key should pry out - gib keys are tapered. Hope this helps some. Paul
Re: IH #80 combine in reply to Paul swPa, 10-11-2018 20:40:58
Paul Thank You so much, I did not know what the key was called and once you told me and I realized that I was on the right path I was able to pull up so much info, now finding a gib key puller or making one of my own.
Re: IH #80 combine in reply to Jim Kam, 10-12-2018 03:31:18
Jim, We never had a regular gib key puller. Just used a heel bar or find a chisel (or two) with the right kind of taper to it and drive in between the head of gib key and (in this case) the sheave. As to the sheave having a separate hub, as another post said, I really can't remember - too long ago. I can only remember needing to change the speed maybe one time (for whatever reason) which was done by loosening the belt tensioner, moving the belt to another step in the sheaves, and readjusting the tensioner. Sort of like changing the speed on a drillpress. Paul
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