Given the mower's history it might be a good idea to plug a pressure gauge into the charge circuit to make sure that is up to par. A loss of charge pressure for any reason (running it dry or otherwise) would result in the kind of damage you found. I'm not sure what kind of charge pressure would be typical for a lawn mower hydro - it is probably a lot less than the 350+ psi I'm used to seeing for large servo-controlled hydrostats. Probably something in the 75 psi range would be expected.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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