Hey Chris, I have been reading your post and it sounds like you know what you are talking about. I too have a floor jack that will not pick up one wheel of my truck, but it will go up with no load. I filled it with hydraulic oil, but as far as bleeding, I am not familiar as to how to do this if that is the problem. This jack is only a couple years old at best. I just bought it from a guy hoping I could fix it. The model number is 480578. Is this something I could rebuild myself and where would I get the parts. I thank You very much in advance and hope you and your family have a safe and warm new year. My email is email@example.com and I would appreciate any info you could offer,
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on most jacks that have a pump up handle that on the side you pu in a handle that goes up and down. on the bottom of that part you will see a little metal nub. Just turn that conter clock wise and it will lower the jack
If your talking about a 1960 car jack you will see a littlw lever on the side that you move up or down, This will let you jack it down
Hope this helped and dont for get to rate us. Be SAFE when working around jacks
You either need to top up the oil, or change the oil. Both of these are easy to do. You'll need some high-grade jack oil, an Allen wrench, a rag or two, and a funnel.
1.) Relieve the pressure and lower the jack arm all the way down. 2.) Remove the tool tray from between the two rear wheels. 3.) Wipe the oil fill plug clean. (You don't want any gunk or debris falling inside.) 4.) Remove the plug with the Allen wrench.
Look inside. If the oil level is at or below the inner cylinder wall, you'll need to add oil. Don't go more than 3/16"-1/4" above the inner cylinder wall.
With the pressure still off, gently raise & lower the arm two or three times. Check and adjust your oil level again. Then screw the plug back in & tighten it with your Allen wrench.
Everything OK? Great. If not, repeat 1 through 4, then lay the jack on its side & drain ALL the oil out (into a container). When it's empty, set it upright & fill it. Again, raise & lower the arm several times.
Replace the plug, tighten it, then test. Raise the jack all the way up, then lower it all the way down, without any load on it. Repeat this two more times. (This helps to dissipate the air bubbles in the oil.) It should now be ready to use.
IT SOUNDS LIKE IT IS CAPABLE OF MOVING FLUID FROM THE RESERVOIR TO THE CYLINDER. CAN YOU SEE THE SMALL PUMP PISTON POP BACK OUT WHEN PUMPING THE HANDLE? MOST JACK PROBLEMS BELIEVE IT NOT IS AIR. THEY GET AIR POCKETS IN THEM AND CANT PUMP THEM OUT. TRY REMOVING THE FILL PLUG ( TYPICALLY A SMALL RUBBER POP-IN CAP ) FROM THE CYLINDER AND JACK IT UP. IF THIS WORKS DO IT FEW TIMES, THEN REINSTALL THE PLUG. YOU COULD ALSO HAVE A SMALL CHECK VALVE PROBLEM INSIDE. IF YOU DISASSEMBLE, BEWARE OF SMALL SPRINGS AND CHECK BALLS. MAKE NOTES. HOPE THIS HELPS.
DONT KNOW WHO BUILT THIS JACK- AC DELCO JUST PUT STICKERS ON IT. TYPICALLY YOU REMOVE A PLASTIC SCREW IN PLUG OR A POP IN RUBBER STOPPER FROM THE TOPSIDE OF THE CYLINDER. WITH THE JACK ALL THE DOWN, FILL IT COMPLETELY UP AND IT SHOULD WORK. SOMETIMES THEY GET AIR IN THEM - JUST LEAVE THE PLUG OUT AND JACK IT UP A FEW TIMES, THEN INSERT PLUG. USUALLY 10 WEIGHT HYD OIL. OR "JACK OIL" AT THE STORE.