mcratchet1 Posted January 13, 2020 Share Posted January 13, 2020 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!! Quote Link to comment https://www.bigmacktrucks.com/topic/60531-cab-jack-help/ Share on other sites More sharing options...
ws721 Posted January 13, 2020 Share Posted January 13, 2020 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 1 Quote Remember if it's got a hood it's no good! Link to comment https://www.bigmacktrucks.com/topic/60531-cab-jack-help/#findComment-440269 Share on other sites More sharing options...
mcratchet1 Posted January 14, 2020 Author Share Posted January 14, 2020 ok thanks i'll look them up Quote Link to comment https://www.bigmacktrucks.com/topic/60531-cab-jack-help/#findComment-440311 Share on other sites More sharing options...
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