unscrew the bleeder screw
make sure it's full of oil
Hydraulic Jack oil
A 10W hydraulic oil will work fine. Your local auto parts store should have it.
There should be a screw on the side of the jack--remove and fill until oil runs out of this screw. Make sure that the "ram" is fully retracted into the body of the jack
Hydraulic jack oil at auto parts or Wal-Mart store
To add oil to a hydraulic bottle jack, first ensure the jack is fully retracted. Remove the oil fill plug, usually located at the top of the jack, and check the oil level; it should be just below the fill hole. Using a funnel, add the appropriate hydraulic oil until it reaches the correct level, then replace the fill plug securely. Finally, test the jack by operating it a few times to ensure proper function and check for any leaks.
Bottle jack hydraulic systems typically use hydraulic oil as the fluid. This oil is specifically formulated to provide the necessary hydraulic pressure for lifting heavy loads while also ensuring smooth operation and lubrication of the internal components. Common types of hydraulic fluids include mineral oil-based fluids, which may contain additives to enhance performance and prevent corrosion. Always check the manufacturer's specifications for the recommended fluid type.
Open the drain screw that holds the body of the hydraulic jack. This way you can addhydraulic oil to the hydraulic jack.
Use "Hydraulic Jack Oil" only
Yes, they are different. Brake fluid will eat the jack seals. Some people might suggest transmission fluid or motor oil, but there's really no need -- hydraulic jack oil is inexpensive and easily available at many tool, hardware, and auto parts stores. And it's supposed to keep seals in the best possible condition. Here are a few part numbers you can search for: GUNK 4KTN1 Hydraulic Jack Oil, 12 Oz Gold Eagle Heavy Duty Jack Oil - JF16 "Ace" Hydraulic Jack Oil (at Ace Hardware Stores). As of this writing in mid 2010, a 12 oz bottle is about $4.
Hydraulic jack oil Available at auto parts store or Wal-Mart Use AW68 grade hydraulic oil
These jacks generally use hydraulic oil to operate the hydraulic system. There are a number of different types of oil for these jacks, but they are so similar that they are often marketed as "hydraulic jack oil" and there is little to no differentiation.