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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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