I think you are correct. I would do some time testing first. Work the boom several times and time the lift stroke to get a base line on its speed. if it gets in a streak of drifting down, stop it part way down with a high lift jack, cherry picker, or chain fall to a beam. then remove and cap the lines going to the cylinder/s. now manually lower the boom, and if it is good internally, it will just move a little and then stop and stay put. If it drifts down, even a little, the piston (in one or the other cylinders) is bypassing. Simple, rule out one of two possible issues using the least difficult method. Jim
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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,
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