How to Change the Oil of Your Floor Jack

What You'll Need
Cleaning cloths
Small funnel
Wrench set
Hydraulic jack oil
Drain pan
Owner's manual

A floor jack is used to lift heavy objects. This lifting device pumps fluid from one chamber to another, which forces a piston to rise. The piston will rise to its optimal height when the fluid is at full capacity. The oil in the floor jack should be replaced every 3 years. Be sure to read the owner's manual provided by the manufacturer for any specific information regarding your floor jack before you attempt to change the oil in it.

Step 1 – Preparing the Jack

Position the floor jack on a hard, flat surface that is level. Inspect the floor jack for any damage or leakage. If you find any damage or leaks, be sure to have the problems fixed before you use it again. Using a damaged or leaking floor jack could lead to dangerous situation.

Step 2 – Lowering the Jack

Lower the jack to the down position. Locate the fluid release valve on the end of the jack. Use the jack handle to turn the valve a half turn, in a counterclockwise direction. Place your foot on the jack. Press the jack downward. Continue pressing until the jack is down to its lowest position. Return the fluid release valve to its original position by turning it a half turn, in a clockwise direction.

Step 3 – Locating the Oil Filler Screw

Locate the oil filler screw near the fluid release valve. Use a cleaning cloth to wipe any residue from the area near the screw. This will prevent any debris from accidentally getting into the jack while you change the oil.

Step 4 – Removing the Oil Filler Screw

Use your wrench to loosen the oil filler screw. Remove the screw and place it in a safe spot where you will be able to find it later. Open the fluid release valve by turning it a half-turn in a counterclockwise direction. Place the drain pan near the oil filler hole.

Step 5 – Draining the Oil

Position the floor jack on its side. Drain the fluid out of the jack onto the drain pan. Position the jack upside down. Drain the rest of the fluid out of the jack.  Be sure to properly dispose of the used oil.

Step 6 – Refilling the Oil

Place the jack in its proper position. Close the fluid release valve by turning it a half-turn in a clockwise direction. Use the funnel to pour the oil into the jack. Add the amount recommended by the jack manufacturer.

Step 7 – Removing Trapped Air

Open the release valve by turning one half turn in a counterclockwise direction. Fully pump the jack handle five times to remove any trapped air. Check the oil level in the jack. If necessary, add more oil.

Step 8 – Replacing the Oil Filler Screw

Position the oil filler screw back onto the jack. Use the wrench to secure the screw into its proper position.