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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
... [Read Article]
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