With my 4" cylinder I did the Area (pi x radius squared) x hydraulic pressure and and the force came out to 15 tons.
The 5 inch would double that since the area of the cylinder would be about double but the cycle time would be half and I wanted a compromise between force and time.
As stated elsewhere, if I get into a bad knot or stubborn log I just load the pump pressure against the blade and give the push plate a smack with my sledge. For the wood I burn, I seldom need the sledge.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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