As far as I know all parts between the same models of Hesston and CaseIH branded in-line balers will interchange assuming they are of the same vintage to capture the serial number breaks for revisions. The CIH equivalent to your 4650 is the 8550. To answer your other question the 700709742 gear has a 35mm diameter bore with 10mm keyway compared to the 700122623 gear's 1.125" (~28.5mm) bore and 5/16" (~8mm) keyway along with some differences in the casting itself. So, no, they are not interchangeable. The 700709742 gear is still in production on current-model balers which would explain why it is much less expensive.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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