The center ring the vanes ride in. Roosa Master injection pumps have a similar fuel pump on the back side. I learned the hard way to write down the rotation settings when I take them apart.
If you look real close you can tell the way they pump. The cage the vanes are contained by can go in either way but the off set is to the left or right. It is that way so for different applications you can change the pump rotation to match your drive.
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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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