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Tool Talk Discussion Forum

Hydraulic jack

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Slowpoke

03-09-2008 10:44:39




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I recently aquired an old red bottle jack about 10 tons, no identification. It only went up about 2" before stopping. I drained the old dark oil, removed and cleaned the two springs and balls and the return valve. It was filled on it's side with new fluid, plugged and put upright in a press so I could do some bending.

The pump started out with full pressure strokes, then decreased to nothing as the ram extended to about 3". I thought it needed more oil, so I removed the rubber plug. There was a loud sound of a vacuum being released. I didn't add more oil, but I tried pumping again and the jack worked like it should, with full pressure strokes and the ram extending with each pump.

When I opened the return valve, the press springs forced the ram down and oil came out of the filler hole and ran all over the workpiece and the press. Why was there a vacuum and how can it be eliminated so the jack will work?

The jack has no packing nut at the ram or pump. It has factory welded collars so I see no way of replacing the seals although they are not leaking now.
Thanks

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guido

03-10-2008 05:50:10




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 Re: Hydraulic jack in reply to Slowpoke, 03-09-2008 10:44:39  
Hello Slowpoke
We had a 20 or 2 ton bottle jack at work with air over hydraulic I think it was a blackhawk or something . You fill it the same way upright.The filler is on the the top side close to the valve. One trick to remember: put some oil in it and jack it up.
When it stops going, up do it again. When there is enough oil in it , it will be fully extended.
Guido.



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Duke(WNY)

03-10-2008 05:19:00




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 Re: Hydraulic jack in reply to Slowpoke, 03-09-2008 10:44:39  
Take a close look at the top of the reservoir and see if there is a snap ring (with no 'eyes') holding the packing in. Jack is probably a Blackhawk "welded" jack, although most of the ones I have seen used a screw for a filler plug rather than a rubber plug.



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guido

03-09-2008 12:50:33




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 Re: Hydraulic jack in reply to Slowpoke, 03-09-2008 10:44:39  
Hello slowpoke.
If you filled the jack on its side you over filled it.
It should be filled up to the oil filler hole with the jack standing up and with the ram all the way down.
Guido.



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oleblu

03-09-2008 17:49:13




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 Re: Hydraulic jack in reply to guido, 03-09-2008 12:50:33  
guido is correct that a jack should be upright with the ram all the way down to check/fill with oil. Then replace the fill plug, run the jack all the way out, open the valve, turn the jack UPSIDE DOWN and collapse the ram all the way in. Close the valve and re-check your fluid level. This procedure was told to me by a repair shop to remove the trapped air in the jack.



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Slowpoke

03-09-2008 22:51:31




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 Re: Hydraulic jack in reply to oleblu, 03-09-2008 17:49:13  
I did what guido said, and set the jack upright and let the oil level drop down to the bottom of the fill hole, and the ram pumped out full length without a load. I'll try your upside down method tomorrow and see if more oil is needed. In the case of a floor jack, is the fluid brought up to the fill hole while the jack remains on its side?
I was also given a non-working 20 ton Hein-Werner jack that was made in Taiwan. There are no plugs for the passageways, but it does have a nut for the ram seal and the pump shaft.
With the two bottle jacks came a large floor jack and a truckload of other things like an airless sprayer, 8 scaffold jack screws, boxes of new and used plumbing fixtures for tubs, rebar, a working model 77 skilsaw, a working Craftsman 1/2" drill, an old tool box with lots of heavy offset chisel like thingies and other stuff which I have no idea what its use is. It was a country yard sale where most of the stuff was free, yet people ignored the 10x30' area of "junk" items. Did I say two truckloads? Yes two, but it's a small truck. When I learn how to post pictures here, I'll put some of the unknown items on display.

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