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It may just need to have some oil added to it, they do lose some over time. There should be either a rubber plug or a screw in plug toward the top of the cylinder on the side. If that is not the problem, it has to be rebuilt, new seal put into it. If it is a name brand, rebuild kits are sometimes available. Some off brand or import ones just have to be replaced.

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12y ago
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15y ago

Older quality jacks made in USA are rebuildable. You need to contact the company that built the jack and purchase a rebuild kit. If it's made in China, throw it away and buy a new one.

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15y ago

Try turning the screw in the front to tighten it.

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Q: How do you repair a hydrolic jack that fails to lift?
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