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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.
Lets look at the whole problem. Did you have a new unit inside. Is the charge correct for unit. 1 lb of refrigerant makes difference. Four tons should be big enough if you have proper insulation. I have three tons in a 2100 square foot house. Its plenty big enough. You may have to small a return air. To small a return can cut a four ton unit to 2.5 ton unit very easily. 1.5 square foot pf free grille area per ton. Rusty
You need to rebuild the carburetor. Go to m-and-d.com then parts diagram then illustrated parts online then parts look up then under select OEM select Homelite then do as instructed. You should find the parts you need and hopefully the parts breakdown for the carb. this will help you in the rebuild. If it does not have the parts breakdown for the carb. find what mfg and model carb. it is then go to that site for breakdown.
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