My dad and I bought 3 air bumper jacks the other day , and one of them was brand new , never used , and for some reason , it by-p***es air thru the cylinder , we took it apart , and it only has a flat piston-looking piece with a rubber ring around it that acts as a seal ring (like a piston in a cylinder) , it has greae on it to lubricate it , , anyway , I tooke it apart , cleaned everything , put it back together , and still the same thing , anyone have any advice on these? , the jack is made like this....
I have an old one, like that, that leaks a little,and I lifted the outer cylinder off, cleaned it an lubed it with grease, re-***embled, and greased LIBERALLY, through the port, in the top of the cylinder....................Still leaks a little, but lifts WELL, and safely, ( for it's design), up to the level where the locks can be engaged.............................I use mine, as needed, and feel comfortable with it.
I used 2 of them doing exhaust for 10 years. I just got used to raising the vehicle, letting it down on the safety locks and forgetting about it. It will get your attention if it suddenly falls an inch to the locks if you are under it on a creeper. Whatever you do don't rely on the air cylinder to keep the car in the air. If it leaks so bad that it won't raise the car then it's probably junk. I do this with 4 and 2 post lifts also. I came in one morning to find that my guy did not set the safeties and my 4 post lift with a car on it leaked down over night crushing the roof of a 2 year old Pontiac. The front safety caught but the back one didn't. Thank God for insurance.
I think they were made leaking. Mine leaks a little too. I have an old tire iron bumper jack pry bar I shove thru the side holes as a safety stop backup and just deal with it.
I only used an ammount that was in it when I took it apart , (about a heaping handful) , is that enough , or do I just pump the whole cylinder with say , 2 -3 cartriges of grease? , like I said , this is a brand-new jack , never used , We bought them from a place that was shutting down and it litterally looks unused , will a gut load of grease do the trick? , if so , where is the orfice that you pump it in at?
It seemed a little stiff , but , I think it was because of the cold weather here , I layed it in front of the heater , and it became soft and pliable , pulled it back around the piston , and put it back together , can you buy those rubber rings?
I have four of them and occasionally I dis***emble them and clean and re-grease them. Then I introduce a very thick oil into the air inlet, about enough to fill the top of the seal 1/4' deep. I use "Motor medic" there are other "old motor cures" on the market that will work well also.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o> <o></o> One of the jacks has a pipe plug on the top that I can just pour it in, the others I have to inject into it using a vertical 1’ pipe about 1’ long threaded into the inlet and capped on the other end with a valve to apply air.
Some rubber supply houses carry various styles of O rings in either round or square design. A jack will usually use the square design O ring. Or you might try a local hydraulic place. Often there are some that spe******e in jack repair and may have the O ring, and suggestions on your leakage issue.
we have to old ones that we use for our racing operation that we got from our old mechanic in town. if i recall right one leaks a little, we just lift the car up the bring it down and lock it in position, they work great for the price we paid....free
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