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Hydraulic Jack

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Warren

07-07-2000 10:55:12




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My hydraulic jack has air in it. It will raise only about 4 inches with no load. The piston is then able to be pushed down by hand about an inch. If I put a heavy load on it, it will only raise about 3 inches. I have tried to add more hydraulic oil after removing the screw that releases pressure to allow the jack to go down. I can add oil very slowly and it is extremely messy. I am able to expel some air during this process. This has helped some, but I am wondering if there is an easier way to add the oil. Am I missing something here?

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PAUL SANTOS

10-30-2003 10:05:08




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 Re: Hydraulic Jack in reply to Warren, 07-07-2000 10:55:12  
I WOULD LIKE TO BUY A REBUILDING KIT FOR A HYNE-WARNER 2 1/2 TON FLOOR JACK. THANK YOU



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Gabe Raggio

04-22-2001 09:17:36




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 Re: Hydraulic Jack in reply to Warren, 07-07-2000 10:55:12  
I have an Allied 2 1/4 ton service jack for lifting auto's. It has lost its ability to stay up. I suspect it needs cleaning or an overhaul. Can anybody help me with my problem?

Thanks,

Gabe Raggio



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George Cavalieri

07-12-2000 12:50:52




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 Re: Hydraulic Jack in reply to Warren, 07-07-2000 10:55:12  
I agree with Mike...buy a new jack. You've spent $65 in your own time foolin with this one already.



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MIKE

07-11-2000 11:50:35




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 Re: Hydraulic Jack in reply to Warren, 07-07-2000 10:55:12  
Hyd jacks are throwaways as far as I am concerned. I buy four or five a year and once they start leaking or getting slow I replace them. I have a pile of 25-30 used jacks if anyone is interested. Rebuild kits are around 25$ and I did a couple of them, but were never as good as new. New 8 ton jacks are 63$ and if they last 6-7 monnths I am happy. Jet jacks have worked the best for me. Mike



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Dennis/Ohio

07-10-2000 17:23:26




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 Re: Hydraulic Jack in reply to Warren, 07-07-2000 10:55:12  
Warren, I use an oil can with a small spout. I put the spout inside the filler hole. As I pump the oil in, the air comes out around the spout. Good luck. Dennis..... .



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Duke

07-09-2000 17:01:32




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 Re: Hydraulic Jack in reply to Warren, 07-07-2000 10:55:12  
To get the air out of a jack pump it all the way up, then open the release valve. Turn the jack upside down and push the ram back in. Then loosen the filler screw and let the air out.You may have to do this 3 or 4 times. Point the filler screw away from you when you open it.



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Nathan(GA)

07-07-2000 19:56:20




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 Re: Hydraulic Jack in reply to Warren, 07-07-2000 10:55:12  
Warren, I'm certainly NOT an expert on jacks, but every one that I have dealt with, you put the oil in another hole. It is usually about half way up on the side. Maybe someone else can steer you right.



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AD

07-09-2000 11:36:30




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 Re: Re: Hydraulic Jack in reply to Nathan(GA), 07-07-2000 19:56:20  
Like Nathan said I am no whiz on jacks but all I own have the filler hole up about half way of the body and you can remove the rubber plug and fill with fluid. Never fill above this hole with the jack in the upright position with the cylinder fully in the down position. You can lay it on its side for easy filling but stand upright and allow fluid to run out down to filler hole level. Cylinder may have to be raised and lower a time or two to expell any trapped air then refill to proper level. If the jack will not hold under load,either the little ball in the control valve is not there( not all jacks have the ball but have a needle seat)or the seals around the cylinder are needing to be replaced. AD

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AD

07-09-2000 11:34:12




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 Re: Re: Hydraulic Jack in reply to Nathan(GA), 07-07-2000 19:56:20  
As Nathan said I am no whiz on jacks but all I have have the filler hole up about half way of the body and you can remove the rubber plug and fill with fluid. Never fill above this hole with the jack in the upright position with the cylinder fully in the down position. You can lay it on its side for easy filling but stand upright and allow fluid to run out down to filler hole level. Cylinder may have to be raised and lower a time or two to expell any trapped air then refill to proper level. If the jack will not hold under load,either the little ball in the control valve is not there( not all jacks have the ball but have a needle seat)or the seals around the cylinder are needing to be replaced. AD

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