Where is the fluid filler hole on a Larin LJ-4000 floor jack?

Answer 1

Look under the nameplate and you should see a dome-shaped cap (mine is painted same red color as the cylinder). This in fact is a rubber 'bung' covering the fill hoe - pry this cap off with your fingers or a flat screwdriver blade (careful not to damage the rubber sealing part). To drain, completely remove the raise/lower screw and drain from this hole with the jack tipped upright (you may have to operate the jack's lever a few times. When empty, place jack on level ground and use a suitable shaped funnel to reach the open fill hole. Fill with Jack Oil till fluid is up to the fill hole lower edge. Replace the cap, being careful to re-seat the sealing edge completely - you may need to use your blunt screwdriver again. Operate jack and raise to maximum, keep pumping to purge system. If further purging is necessary, lower fully and pump 10-20 times with raise/lower screw open. Hope this helps!