I had the same problem with the Liftall pump on my '47 M this spring. The crack in mine was about half way along the high-pressure passageway for the left rear outlet (the one on the pump back plate).
I ended up using carb cleaner to remove the oil residue from that passageway, screwed a plug into the end of it, then mixed up 3 tubes of JB Weld and filled/plugged that passageway completely. I let it cure overnight, re-assembled and installed the pump, it's been working fine with no leaks or problems since. (I only use one hydraulic outlet, so having only two working outlets isn't a problem for me.)
I don't know if just the pump back plate is still available anywhere, but even if it is, I doubt I could get if for the $15 it cost me for the JB Weld. The only whole pumps I could find, including this site, sell for at least $700.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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