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Jeff, your problem description is among the best that I have ever seen. I agree with you that it is baffling to say the least. The metal filings are probably left over from the original follower failure - unusually difficult to get things cleaned up after a failure. I may not be able to help you. Any help I may give will be in the form of a question. I have fixed some of these but each is different and I've never been near a D-19. From your description, it sounds like a belly mount pump like those in series II and III D-17 tractors. Do you have an exploded view of the pump? This is important because there are so many parts in these devils and it is very difficult to know if anything is missing without the exploded view. I once had one apart on a CA - it wouldn't work because it was missing a spool from the valve (how could this happen???). If the pump cylinders are perfectly smooth and the plunger springs are still the correct length and tension, the Cam follower should never leave the cam. Since you hear slapping, it sounds like the plunger is not coming out like it should at operating speeds. Probably, you could compare the springs. If any are different, I'd replace all the short springs. If the cylinders have scratches, they must be smoothed out. If there are scratches on any of the plungers, they must be removed. And lastly, everything must be very clean. But you may already know all of this and I haven't helped you. Before assembling into the tractor, move each of the plungers into maximum in position and release. I had one once that looked good but it wasn't. I couldn't get it all the way pushed in (and this wasn't obvious) because of debree in the cylinders. In another it couldn't go in completely because of a cylinder gaul - and it would stick in the in position. If it doesn't pop out incredibly fast without hesitation, it might permit the follower to come off the cam and cause a slap. And lastly, I am assuming you have pulled out everything in the pump and cleaned all of the passages. This should be pretty easy to take apart and reassemble if you have an exploded view. Don't assume all of the parts are there and in the right place. I have exploded views for all D-17 and D-14 tractors and it may be the same for a D-19. Email me and I can send a copy of the D-17 pumps. Or email with more info and general discussion. Remember, when doing all of this, something caused that cam follower to fail. This not a common failure. Something happened in that cylinder to cause this. Find that something and the problem is probably solved. This device is pretty simple and fool proof if all the parts are in good condition. Good luck.
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