You can try driving them up with a jack or down with a post. Before that or between you can try a diesel/ATF mixture, your favorite rust breaker, or any other dozens of other people's favorite.
If it looks quite stubborn, you can burn the mixture in the holes to give some thermal cycling to allow the penetrant to sneak deeper; also, if you try wacking the piston just after the flame goes out (may want a rag around the post to protect yourself from any hot residue), a cold piston and warm sleeve should break easier.
See if you can get a pair to move up (a jack is a good option), then removing the caps on the other two you can drive them down putting force on only one at a time.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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