You probably dont want to hear this, but you should remove the pump and overhaul it. Not knowing the sound its making, you are correct that it could be the cam striking the cam follower. This would be due to a broken piston spring, not holding the follower against the cam. Although the pump seems to be working well, this is a condition that can cause the pump to fail down the road, or tomorrow. This pump controls itself through a series of orifices and spool valves. If the wrong orifice becomes plugged, the pump cant unload and dangerously high pressure will result. This can happen if that spring continues to break up and circulate pieces through the system. On the bright side, it could continue to function as it is right now for the rest of our lives, but consider this: if our guess is correct, the pump is only running at 3/4 capacity right now, because one piston is not making a full stroke. So there is more hydraulic speed to be had for the cost of a handful of reasonably priced parts and one afternoon.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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