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Message: <blockquote data-quote="Fishfiles" data-source="post: 15526" data-attributes="member: 782"><p>Are there holding valves on the cylinders , they woud be manifold block mounted to the base end of the tube which acts as a saftey device to prevent boom from dropped if a hydraulic oil blow out occured , --- there could also be restricter / orifice valves in the plumbing , it will look like a fitting and have a plastic (usually) which is in there to slow down the down side movement , have seen these cause problems ----------could be the nut holding the piston to the rod loosened up ---------how did this all start , did you disassemble the cylinders for repairs , or did the problem start it all</p></blockquote><p></p>