How To Bleed or Air Purge a Trolley Jack

Why You Need to Bleed Your Trolley Jack

As a closed system that relies on hydraulic pressure to generate lift, you might think that a trolley jack is invulnerable to air contamination. Actually, this is far from the truth. In abstraction, it would be the case that because of the closed nature of a hydraulic floor jack, it would be expected that no air could penetrate the system and there would therefore be no need for bleeding.

Unfortunately, the world doesn’t operate in abstract, and hydraulic trolley jacks are not always perfect. The cylinder is ended by valves and seals, and air can pass through these over time. If a crack in the seal occurs, you’ll find that the reliability of the jack becomes compromised, and the jack might actually not be safe to use. The release valve can also draw air in during use which again becomes trapped within the hydraulic system. This makes looking after your trolley jack essential.

You can remedy this by bleeding your jack following a quick and simple procedure. If you really want to ensure the longevity of your jack, and that it works to its optimum level of performance, it’s something that you’ll need to master. So without further ado, here’s a short guide that explains how to bleed your trolley jack and why you really ought to do it.

  • How to Bleed Your Trolley Jack

    1. The jack handle should be placed on the release valve and turned to open the valve.
    How to Bleed Your Trolley Jack
  • How to Bleed Your Trolley Jack

    2. Place the handle back into the receiver and pump the jack handle up and down 20 times. This should force any air from the system and lubricate the seals.
    How to Bleed Your Trolley Jack
  • How to Bleed Your Trolley Jack

    3. Close the release valve.
    How to Bleed Your Trolley Jack
  • How to Bleed Your Trolley Jack

    4. Test the jack. If the jack won't lift or lifts but won't hold a load then repeat the procedure.
    How to Bleed Your Trolley Jack