Once the jack is lowered locate the oil filler port which is on the bottom of the jack s reservoir near the flat base.
Floor jack fluid fill.
To add oil to a hydraulic floor jack start by making sure the jack is completely lowered by turning the jack s release valve counterclockwise until it s as low as it can get.
The hydraulic fluid is compressed inside the floor jack and this forces the pistons to rise and this pushes the saddle to lift your vehicle.
You should check your fluid level at least once every 12 months more often if you use the jack frequently like in a workshop situation.
Then remove the plug or screw from the oil.
As a matter of fact without the hydraulic fluid the hydraulic floor jacks cannot work.
Firstly if the hydraulic floor jack is not lifting properly then the oil level is required to be checked.
In this case turn the jack upside down and drain the contaminated oil fill the jack with the new oil up to the required level.
How to fill a floor jack if you own and use a hydraulic floor jack you will want to ensure you keep the the hydraulic fluid level at full for proper and safe operation.