I found the following info that answers this question at
http://www.hyjacks.com/H7.HTM
unscrew the bleeder screw
make sure it's full of 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
For most floor and bottle style jacks, you can get hydraulic fluid at most hardware stores. I work at Ace Hardware and we carry it in 20 oz. and gallon containers. The Ace item number for the 20 oz. bottle is 85435. Gary
Open the drain screw that holds the body of the hydraulic jack. This way you can addhydraulic oil to the hydraulic jack.
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form_title=Purchase a Hydraulic Jack form_header=Hydraulic Jacks are a vitally important Would you like the hydraulic jack with an easy lift mechanism or is the standard jack sufficient for you?=_ Does the jack need to be portable?= () Yes () No How heavy will the vehicles be?=_
Remove screw that lowers jack
hydraulic brake and hydraulic jack
This is a very general question. I am familiar with hydraulic or "bottle" jacks, and I think this is what your question is about. Hydraulic jacks have a pump to force hydraulic fluid into a hydraulic cylinder, which forces it to extend. This action is what raises whatever load you place it under. The fluid is usually pretty specific to the jack. Go to your local hardware store and ask for hydraulic jack oil. I have seen people use transmission fluid in a pinch (way out on the farm, miles from the store).