It is the large cylinder in the middle. I have replaced the seals in the cylinder but not the small check ball and spring in the bottom of the ram. The ball and spring was moving free and did not have any trash that I could see in it. This has a three cylinder set up. It will creep down even with mast extended up using the other cylinders, but it is the center cylinder that will creep down. Is that small ball in the bottom of ram the saftey valve you are talking about?
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