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Hydraulic jack problem

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Fred

04-10-2003 07:05:26




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Have A small 2 ton jack, that after A few strokes,won`t raise any more.Full of oil.Could it be air & if so,how do get rid of it? Regards,Fred




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gardener

11-02-2003 17:40:05




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
Not exactly related, but i have a hydraulic project, a dump trailer which i want to weld up, wanting to use a 10000psi hand pump unit (comes with a 6" receiving piston)... to operate a proposed 24-30"stroke cylinder having 3000psi. A local expert tells me that the hand unit will blow the seals in the 24-30" receiving piston regardless of load.
I reckoned that if my load doesnt exceed 3 tons, then it would never get to the point of bursting anything. Is this correct?
There is the problem of insufficient oil capacity in the sending unit, but can a reservoir be inserted? ,and how?
Is it necessary to find a one-way cylinder or can i adapt a 2-port cylinder somehow?
I really want to do this with a manual pump action.
I've already built a minidumper using an engine hoist jack cylinder.....dumps around 1400 lbs. Thanks to any who can help with this. I cant justify an expensive electro-dependant 12-volt power unit for something i would use only a few times a year..... ...gardener

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mahsa

06-24-2003 04:45:14




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
I don't want to reply I just want to ask you that how does a hydraulic jack work?



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John

04-10-2003 17:25:12




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
If you think the ball is not seating correctly, We use a brass drift and tap the ball to form a better seat. The ball should be quite hard.

Make sure there is clean oil in the resevoir. And that the resevoir is filled when the jack is in the down position.



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Fred

04-11-2003 09:36:58




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 Re: Re: Hydraulic jack problem in reply to John, 04-10-2003 17:25:12  
Thanks fellows.Air was the problem.Followed your advice & it works fine now.Thanks again, Fred.



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Duke(WNY)

04-10-2003 16:07:01




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
Try pumping the jack up as far as it will go - open the release valve - turn jack upside down and push the ram back in - this will move air to the reservoir. Set jack upright and remove filler screw to let air out. Repeat as necessary.



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bill

04-10-2003 14:58:38




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
On most jack problems it due to air. A very easly test to do is open the valve and let the jack drop by itself,,, then use the handle to try and pump the jack up 10 to 15 strokes, with the valve still open. then close the valve. If the jack is going to work, then it will. Learned that from a gent who fixed alot of jacks.



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bobcat

04-10-2003 14:27:26




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
I have one like that, I've been using for years.
What I do is push down on the ram as I pump, then it's ok, works like it should till it's all the way down again, then push again & ok!



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Vern-MI

04-10-2003 13:41:41




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
Probably either dirt (metal or other debris) in the oil or bad ball seats either poorly machined or made from cheap and crumbling gray cast iron causing the check valves to not seat or work properly. Chuck it.



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Paul (WI)

04-10-2003 13:12:36




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
I had a jack act like that and I found out that there were loose pieces of plastic in the oil. These pieces wouuld get caught in the ball checks.



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Ben in KY

04-10-2003 08:50:14




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 Re: Hydraulic jack problem in reply to Fred, 04-10-2003 07:05:26  
It is probably the seals in the pump part. I had one doing that, I found it was sucking air into the pump chamber on the upstroke and air locking because of this. The jack is still that way, because I have found no place to get parts for it. It is a cheapo import, they do not seem to last very long :( Cheap is cheap in hydraulic jacks.



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Fred

04-10-2003 11:38:31




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 Re: Re: Hydraulic jack problem in reply to Ben in KY, 04-10-2003 08:50:14  
Thanks for the come back Ben.Sounds like I might have the mate to yours.I went cheap & got just what I paid for.Never to old to learn!! Fred



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