How to Bleed a Hydraulic Floor Jack

Written by mary lougee
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A hydraulic floor jack has a sealed system that does not normally retain air to bleed from the cylinder. If a seal or a check valve is leaking, air may enter the system and cause the jack to act erratically when raising and lowering. Releasing the excess air in a hydraulic floor jack enables smooth and dependable operation when raising and lowering the tool.

Skill level:

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Things you need

  • Flathead screwdriver

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  1. 1

    Place the jack handle on the release valve and turn it completely clockwise to close the valve. The release valve location depends on the jack's manufacturer.

  2. 2

    Insert the handle into the pump receiver so the two half circles on the handle snap onto the two metal pins on the pump receiver.

  3. 3

    Pump the jack handle up and down to raise it to the highest level upward and outward. Each upward stroke compresses air to force hydraulic fluid upward on a down stroke and raise the jack.

  4. 4

    Pull the jack handle out of the pump receiver and place it on the release valve. Quickly turn the handle completely counterclockwise to open the valve. The jack will descend to its lowest height immediately.

  5. 5

    Turn the hydraulic oil filter plug counterclockwise with a flathead screwdriver to open it. You'll hear a slight hissing noise as air escapes from the system.

  6. 6

    Turn the hydraulic oil filler plug clockwise to tighten it and seal the system.

Tips and warnings

  • The jack handle is slightly concave on two sides opposite each other to grip the release valve.
  • Check the user’s manual for the release valve location on each hydraulic floor jack. Do not turn the overload or check valves by mistake or the hydraulic fluid will leak out of the jack.

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