flatness tolerances on hydraulic pumps are really low, down in the micron range. If you can't get those pins out you're going to do more harm than good trying to lap it. run a finger across and carefully buff off any burrs that would keep the sections from seating properly. The end clearance on a gear pump is the largest driver of pump efficiency as well as durability. There is a a fine line between too much clearance and too much fluid slip across the gear faces reducing efficiency and possibly even pressure capability of the pump. Too little clearance and you can run into scuffing issues that will stick a pump or completely destroy it. Debris sensitivity comes into play here too.
I've seen gear pumps with the faces of the gear teeth worn so bad they were concave instead of convex and the lash was terrible but the end clearance hadn't worn at all and the pump still worked fine. No indication from the operator anything was wrong, pump came back to me for 20,000 tear-down inspection.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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