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Old 03-28-2020, 11:00 AM   #10
rotorwrench
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Join Date: Jun 2010
Location: San Antonio, Texas
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Default Re: Floor jack won't release under load, any ideas?

The piston on a jack should be retracted all the way before filling. It would be hard to overfill one using this configuration. As soon as you start pumping the fluid to the piston, the reservoir level will decrease. Some jacks have a vent valve to prevent liquid locking in this instance.
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