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Floor Jack 480578
Jack purchased from Harbor Freight. Had a bit of leakage so serviced far right port on head of jack with about 3oz of oil. After service jack would lift with pumping but as soon a a load was on it seem to go into a bypass mode. Handle would continue to travel with a bit of resistance, but jack would not lift load. Since if you do something and do not like it outcome, you undo it, I drained some of the oil out. It then lifted a load, but not to full travel before the bypass started again. Drained a bit more of oil, and then it was back to beginning not lifting load at all. Added a bit more oil and no success, will not lift load again. Cannot find a operators or service manual on the web site. Does not make any sense how it is responding, maybe oil fill was just a coincidence with another failure.

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