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ok ordered a relief and a mini mast transducer just to be on the safe side , and at the top you are right it does not seem to bypass. I will up date when the parts come
I've seen a couple of odd ball things cause seals to blow out- excessive temps- How hot does the oil get in this cyl compared to the other cyl's?, Environment- How is the surface this unit rides on- smooth or moderately bumpy? Tires- same as enviroment. Operator- is he/she constantly "bumping" the hoist cyl up & down rather than smoothly operating the hoist.
What is the pressure relief set to? You should be around 2000psi.
I would start there.. if the prop valve was bad and the cylinder had no deceleration it should still not blow the seal out.
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