What hydraulic oil to use in a old Sears jack?

Presume it a hydraulic jack. Most are sealed, some of the more expensive types will have a valve, usually hidden somewhere.
But what you need to look for first is where it is leaking from.
If it has lost fluid chances are one of the seals have blown.

hydraulic oil is what is needed.

Sounds like a bad seal on that plunger that pumps up and down. That plunger should unscrew and then it's pilled out , there should be an O ring. That is where it probably is leaking. You probably need to top off oil. You can jack oil in an auto store or Lowes, etc.

It was made by Hein-Werner, Similar to the WS model also 3,000lbs (not 3 tons). Been out of production at least 20 years or more. Guardian was Hein-Werner's cheaper off brand. Kind of a "dumbed-down" version. Also made an H-101 which was similar to H-W OS (O-Boy) model of 2500lbs.

Try a hydraulics dealer who sells Hein Werner parts. although obsolete, about 1/2 the parts are still available.

Lastly: Hydraulic jack oil. Never use brake fluid. Engine oil in a pinch, by I would never do it.

Sounds like it needs some hydraulic fluid added.Look for a rubber plug or screw on the side of the hydroelectric cylinder where the ram comes out.Buy a zoom spout oilier and save the oil.Use some solvent and clean it out.Add some hydraulic fluid and fill until it starts to come out.You may be able to find an oil can that will work for you. Leave the jack in the closed position when you fill it.

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craftsman tools are supposed to have a lifetime warranty, take it back and throw a fit, they will replace it

how do i bleed my floor jack

Hi, A hydraulic jack is a pretty simple device, consisting of a piston/ cylinder, an oil reservoir, and a valve. You close the valve, pump the handle, which pumps oil into the cylinder and raises the jack. When you open the valve, it allows the oil to flow back into the reservoir and the jack will lower. If it still has oil in it, ( or is still in the up position) start with the valve, you should be able to remove it an clean it up. If you need more help, let me know. Good Luck, this should Fixya!

Hi,

I think I have the same jack. Th serial number was on a little sticker that is long gone,but the model number you need might needs is: 875.501390.

Hope this helps.
Gary

I have a Sears 1 1/2 ton floor jack. I was able to buy a repair kit from Astro Pneumatic Tool Company 372 OLD U.S. Hwy 52 South Mount Airy N,C 27030-8093
1-800-221-9705
John