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Hi again guys. My clarke 1 ton engine crane started leaking hydraulic oil after i folded it up for storage. I,ve had it a good few years and only used it a few times. Has the oil seal gone, and if so are they easy to replace, or is there a simple cure? Also, is hydraulic oil the only sort i can use? Cheers. Alan
 

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wouldnt hurt to chuck some engine oil in anyway, nothing to lose anyway. I dont know if you can 'bleed' them should there be an air lock causing a problem.
 

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I have an ancient 3 ton trolley jack that keeps going on engine oil. Years ago I had a Wolseley 16/60 with tired lever arm shockers which were a bit stiffer with engine oil in.
 

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Our work one has leaked for as long as i can remember, all you need do is lower the ram right down, half way up the ram is normally a rubber bung, take out the bung and refill with hydraulic oil, you may need to work the hydraulics a bit to bleed it through, sorted.
 

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To be honest, I send my rams to a hydraulic specialist for service. Would you want your engine suddenly dropping to the floor and smashing the sump, or landing on the cars bodywork as you lift it in?
 

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Have you identified the actual source of the leak - is it around the ram seal itself or could it be from the low pressure area spilling oil as you have it folded down?
 

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In my view - not the larger diameter round shiny slithery thing but somewhere else like a filler plug or the small pump piston (this isn't low pressure except when you have it folded down of course). Like Col suggests, it could be a good option to get it to a hydraulic engineering company as they usually stock seals and know what to do.
 
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