This is an air over hydraulic 1000# two stage trans jack that won't hold. I can't find a single word of info from the company rep. It's new from a tool supplier who buys the infamous "trailer" load at a time. Who has no knowledge of the equipment he sells. It will raise a load but after a minute or less it suddenly drops an inch or so, again & again. There are no visible leaks or damage. Any suggestions or similar experiences? Thanks SL.
