Out of desperation because my porta power quit on me one day i made a hydraulic line and attached it to an oxygen tank. I filled the line with oil and opened op the tank. Moved the boom for about 5 minutes before the ait froced the oil through and told the operator to overgrease until it took grease everywhere. Only tried it once but, it worked.
I keep a squirt can of engine oil in my toolbox for situations like this.Squirt the pin a couple times a day,drench it pretty good and in a day or two it will take grease.I have done this many times.Ron G
Mixing oil and oxygen under pressure was always a no no. Chance of explosion they say. Just what I heard.