Wow.. yes finally got someone that knows this forklift.yes the bottom shelf cylinder holder appears to leak..the bottom of piston has a packing sleeve that looks like and does unscrew with a tap of screwdriver and hammer.. does that need to be released also or do I just unbolt bottom fluid vessel.. re :4 bolts? Fluid appeared to be coming up through this sleeve..is there any manual that u could suggest to buy to give me an exploded view of piston. The manual I have only shows a single stage piston.. would really like to educate myself on this multi stage piston.. any more help would be greatly appreciated..Dave