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so i have a 2006 mr688s (032711) the jack operates great lifting the cab but when i want to go down it will pump up and get solid and not move. The only way to lower cab is to open the line, there's no leaks or damage visible. My question is there a relief valve inside maybe hanging up? Has anybody had this problem before? Thanks!!

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You may have a bad cab tilt cylinder.  I had that happen. The oil was bypassing inside the cylinder so in effect it was putting oil to both sides of the cylinder.    Power Packer in Indiana is very helpful

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