2 possibilities come to mind...you may have a bad internal hydraulic leak, bleeding off all the available oil to the hydraulic system, or the hex shaft from the crankshaft to the charge pump has stripped, not allowing the charge pump to turn. When you "clutch"it it may move the hex shaft enough for it to get a temporary bite and start turning the charge pump again.This would give you the hammering sound you are hearing as the front pump starts making pressure again. To check the hex shaft, remove the top link bracket,remove the plug behind it and the hex shaft should be able to be pulled out for inspection. If it has stripped it will be very noticeable,(rounded off instead of hex shaped either at the crankshaft end or about 12 inches in from the end you removed it from where it drives the charge pump. Had the same thing happen on a 4430.
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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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