How Tos

Video: How to Maintain or Fix a Floor Jack (Air-Bleeding & Lubrication Tips)

Sunex floor jack


It’s frustrating when you need to lift something with your trusty floor jack, but discover that your previously reliable jack will only lift part-way, or not at all. Othertimes, the jack might be stuck in a lifted position and won’t lower.


For those encountering a stuck jack for the first time, having your jack stuck in the up or down position can elicit the kind of choice language that generally upsets our mothers, and ruins your plans to work on your car or truck.

The good news is that it’s usually* a fast and easy fix, and our friends at Sunex have made a short and accessible video for floor-jack maintenance which should help you solve your trapped-air problem as well as show you how to lubriate your floor jack properly to keep it in tip-top shape for the next time you need it.

(* – sometimes the universe conspires against you, and neither we nor the capable tool experts at Sunex can help you if you’re on the Cosmic Naughty List.)

How to Bleed Air Trapped in a Hydraulic Floor Jack

The most-common reason a floorjack would be stuck in the up or down position would be because of air trapped within the hydraulic pump, preventing the jack from having full range or lifting/lowering capabilities.

You need to bleed or purge the air from the jack, which isn’t difficult once you know how.

1. Rotate, or spin, handle to the right until it stops.

2. Back it up two turns to the left.

3. Pump the jack 10-15 times to release trapped air.

4. Turn the handle all the way to the right to close the relief valve.

Afterward, jack functionality should be back to normal. Now, get to work!

How to Properly Lubricate a Hydraulic Floor Jack

1. Acquire grease.

2. Apply grease to key floor jack components, which are the following:

  • Lift arm pivot pin
  • Axles on front wheels
  • Bearings under caster wheel bracket
  • Back rollers which come into contact with pump plungers
  • Universal joint near release valve
  • Handle base on inside surface of the female handle receiver (must remove handle to access)
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  1. I learned some thing new today!!!!! I did not know how to get air out of floor jack.. what I did was open fill hole an with pump not under any pressure would jack the handle a few times an watch the air bubbles..

  2. Thank you!!! I thought I’d have to rent a crane & crane operator to get my lawn tractor down! Lol I’m tired, hot & sick. Not in the mood for all that!

  3. Wow, thanks dude! I was mad at my teenage son when our neighbors moved last year they gave him a 40’s era heavy duty floor jack that’s sat on my carport for months seemingly stuck forever in up position. Works great now!

  4. Bobby mcafee says:

    My floor jack will lift when I push down on the handle but before I am push it back down it wii already be down. Can’t get it to lift anythingBobby mcafee

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