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2 ton aluminum jack has stopped lifting
I have model 480578, and built a Lotus Super 7 with it! Now, I use the jack to change from street tires to slicks, and it stopped lifting, making a "chirp" with each handle stroke. I purchased a bottle of Jack Oil, and the level was very low in the jack. I went thru the Air Purge system 5 times, adding oil at the beginning of each sequence to replace the air that was removed. It still will not lift weight! What did I do wrong? I bought the jack in 2005 and I really like it! Could it be the pump valves? How do I check them?

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