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Tool Talk Discussion Forum

hydraulic floor jack

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doorguy

04-07-2004 07:57:44




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My Craftsman 3 1/2 ton floor jack will not lift. It acts like the valve is not completely closed. I removed the valve assy. to inspect, and it looks okay to me. Is the taper on the end of this stem a metal to metal seal or is there supposed to be an O-ring seal? Also there are three screws on the valve body that have a tag that says do not adjust. What do these control? Thanks, doorguy




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Vern-MI

04-08-2004 04:36:05




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 Re: hydraulic floor jack in reply to doorguy, 04-07-2004 07:57:44  
Craftsman sells jacks made in China from grey cast iron rather than nodular iron. The grey cast iron crumbles at the edges of the valve seats and allows the oil to leak past. Also these bits of metal debris float around and get trapped between the seats and the mating balls or tapered stems and cause leakage. Dissasemble the hydraulics and thouroughly clean and inspect the seats for damage. If no damage then reassemble using new synthetic oil and it should work OK.

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moonlite

04-07-2004 16:26:30




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 Re: hydraulic floor jack in reply to doorguy, 04-07-2004 07:57:44  
For some reason which I do not understand my hydraulic jacks accumulate a lot of dirt in the fluid. I try to take good care of them and keep them in a good dry place with the ram in the lowered position. I have found that by replacing the fluid I can sometimes restore one to working. I use tractor thansmission / hydraulic fluid.



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Duke(WNY)

04-07-2004 16:21:38




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 Re: hydraulic floor jack in reply to doorguy, 04-07-2004 07:57:44  
You could have some dirt in one of the valves.
It could be air bound. Will the jack pump up with no load on it?



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doorguy

04-07-2004 18:54:09




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 Re: Re: hydraulic floor jack in reply to Duke(WNY), 04-07-2004 16:21:38  
The jack will partially raise with no load on it, but then you can push it back down. Thanks doorguy



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Duke(WNY)

04-08-2004 15:35:02




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 Re: Re: Re: hydraulic floor jack in reply to doorguy, 04-07-2004 18:54:09  
This means that it's lifting until the return spring tension over powers the lifting power. Could be a lot of things: ram cup bad, pump cup bad, dirt in the valves. Your only option is to tear it down and find out what the problem is.



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Bob

04-07-2004 08:47:57




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 Re: hydraulic floor jack in reply to doorguy, 04-07-2004 07:57:44  
The valve is PROBABLY just metal to metal.

As far as the 3 screws, 1 may be pump inlet check valve, 1 may be pump outlet check valve, and one may be the spring loaded pressure relief valve that prevents a strong-arm from lifting something beyond the capacity of the jack. Just a guess, but typical of hydraulic jacks.

Good luck, and BE CAREFULL!



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Dave H (MI)

04-07-2004 13:12:01




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 Re: Re: hydraulic floor jack in reply to Bob, 04-07-2004 08:47:57  
"Good luck, and BE CAREFULL"

As if I am not paranoid enough about roll overs, how is it that my jack is going to kill me? I have to work on a Craftsman floor jack soon. Are you referring to maybe something falling off of it?



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Bob

04-07-2004 14:34:54




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 Re: Re: Re: hydraulic floor jack in reply to Dave H (MI), 04-07-2004 13:12:01  
I was referring to a defective or improperly repaired jack dropping the load suddenly and hurting someone.



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mj

04-07-2004 16:31:27




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 Re: Re: Re: Re: hydraulic floor jack in reply to Bob, 04-07-2004 14:34:54  
Jack it up and then put jack stands under the load.....Roger?



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Bob

04-07-2004 16:47:45




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 Re: Re: Re: Re: Re: hydraulic floor jack in reply to mj, 04-07-2004 16:31:27  
I once had a floor jack (new), that chose to rapidly drop a car JUST AS I WAS PUTTING THE JACKSTANDS UNDER!

Hence, the advice, BE CAREFULL!



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Mel in sw Iowa

04-10-2004 20:32:31




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 Re: Re: Re: Re: Re: Re: hydraulic floor jack in reply to Bob, 04-07-2004 16:47:45  
Two years ago I was under the back end of my dually, which was suspended (4,000# on this axle) by two 3 ton jackstands, blissfully working away when I noticed something odd. I looked directly at one of the jackstands, as the light was just right, and saw daylight through a horizontal fracture through the vertical ratchet column at the top of the jack stand. I quickly crawled out from under, raised that side of the truck with a floor jack and found the ratchet column in two pieces(supposed to be one). Part of the fracture was dark, part fresh. I had probably jacked up one side of my truck, placed this stand, and as I jacked up the other side, placed too great a side load on the jack stand. I left my fractured import at our NAPA store as an object lesson, and purchased two 6 ton stands that are hopefully better quality. I got lucky that it didn't drop my truck on my chest. Complacency almost snuck up and bit me. I am fortunate that I was taking my time and paying attention that day.

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Dave H (MI)

04-08-2004 17:46:19




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 Re: Re: Re: Re: Re: Re: hydraulic floor jack in reply to Bob, 04-07-2004 16:47:45  
That answers my question, thank you. Good advice...not that I would be caught under something on jacks. If I can't reach it from the side, I don't reach it.



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Rusty Jones/ The Mower Ma

04-13-2004 09:02:24




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 Re: Re: Re: Re: Re: Re: Re: hydraulic floor jack in reply to Dave H (MI), 04-08-2004 17:46:19  
Well, if ya buy yer jack stands from a tool man/seller, like Snap-on, you can be pretty sure of the quality of the stands! Never buy those jack stands made out of a light guage, split, tin pipe, three legged type! And, be careful of some other cheapie types--after all--you get what you pay for--and maybe even more, like a crushed body or head! The type with the top part made of 2 pieces are dangerous, too! And, Sears used to have tools that could be trusted, but since they are making their tools in China, stay away from anything that could break, bust, or cause any mayhem to yer body, or head and hands. 'nother thing--NEVER reach in under a raised floor jack, under the saddle end, to get a tool you have dropped or it rolled under there! Fish for it with a stick to get it out!! The raised saddle end can suddenly lose its pressure, fall down, and if yer arm is in there---no more guitar playing for you! And, after you have it all raised up, and setting on the jack stands, go push on the vehicle, to see if it is steady, so it won't fall on ya after ya get under it! And, the heavier the vehicle, the heavier the jack stands should be! Don't ask a boy to do a man's job! Rusty Jones

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