Basically, fluid - especially oil - is the main lifelin […]
Basically, fluid - especially oil - is the main lifeline of every reliable hydraulic bottle jack, whether it is a Hydraulic Bottle Jack or a maintenance jack. Their main job is to do weightlifting. Without oil, it will not be able to perform the usual tasks of lifting heavy objects, which is why the oil level in hydraulic jacks is always checked to maintain its lasting availability.
First of all, you may need some help from reliable tools to complete this task (especially for newcomers). What you need is a screwdriver, a pair of pliers and a small funnel. In addition, it is highly recommended not to use brake fluid or oil or ATF as these oils may damage or corrode the seals and the interior of the jack tank due to high levels of chemicals. For best results, use ISO 150 or AW-32 hydraulic oils because of their lower viscosity characteristics.
All you have to do is lower or fold the jack's ram lifter by loosening the release valve (this is a small bolt near the jack's main pump). As for bottle jacks, rams should also be lowered. Locate the plug of the jack and remove it (do not confuse it with other screws with rubber caps that do not adjust). For ground jacks, most plugs are installed directly below the main pump and may also need to be removed. In the bottle jack, it should be on one side of the cylinder. If your jack needs to be emptied, you can do this by pumping repeatedly when tilting.
Using a funnel, slowly fill the hydraulic bottle jack with hydraulic oil. Make sure the tank is full. Once it begins to leak, you will know this. After that, close the jack plug tightly. The next thing to do is to tighten the release valve and then give it several pumps to ensure that the oil flows to the jack's reservoir or hydraulic chamber. Although it is not always recommended to change the hydraulic fluid, it is best to check the condition and performance of the hydraulic fluid before it is decided to change. However, typical hydraulic oils can be used up to 6 months to 1 year.