Once olgentdc responses with the answer to whether we are dealing with a hoist cylinder that doubles as a reservoir or a separate reservoir, things may be clearer. If it is the cylinder doubling as a reservoir, they will blow oil out the filler/vent opening if they are over filled. The reservoir section is the rod side of the piston and will not hold as much oil as piston end without the rod running through it. When the valve is shifted to lower the body, the return oil is sent to the rod end of the cylinder. It is not uncommon for someone not realizing this to dump oil in the fill opening as the body is going up, if it is not fully raising. Then continuing to add more than maybe a gallon of oil beyond what is needed to extend the ram fully, it will blow out when the body is lowered. And if it has air in the oil from being low, it can blow even more out. From having seen this a number of times, I think this is the issue based on what he has posted so far.
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