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Discussion Forum

How to refill bottle jack ?

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jCarroll

01-20-2000 19:45:20




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My hydraulic jack will only extend about 1/4 of its intended height. At that point, the handle 'feels' like there is no more oil to pump. The jack will hold a load OK, just won't fully raise.

How do you refill the oil on these jacks?




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jCarroll

01-24-2000 14:28:16




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 Re: How to refill bottle jack ? in reply to jCarroll, 01-20-2000 19:45:20  
Thanks for the tips.

My problem (apparently) was air trapped in the oil chamber, becasue after I did the purging cycle, the jacks (2) performed OK.



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AD fm (AR)

01-20-2000 20:07:46




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 Re: How to refill bottle jack ? in reply to jCarroll, 01-20-2000 19:45:20  
There should be a rubber plug on the side of the jack about half way of the body. Lay jack on side remove rubber plug and fill with hydraulic oil and stand jack back up on its base and allow excess oil to run out until fluid is level with hole(or put in some fluid and stand up to check for level)and replace rubber plug. This is to be did with the piston in the down position. So as to not over fill.

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marvin

01-21-2000 12:01:38




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 Re: Re: How to refill bottle jack ? in reply to AD fm (AR), 01-20-2000 20:07:46  
I had the same pronblem with my jack. I pulled the polug and added fluid so that it was full to the hole and then replaced the plug. Now it does not want to pump at all. Either the jack has gone bad or I have air in the line someplace. How do you determine where the problem is and how do you get the air out of the passage ways?



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Well....

01-21-2000 13:52:40




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 Re: Re: Re: How to refill bottle jack ? in reply to marvin, 01-21-2000 12:01:38  
Open the valve and pump it 15 or 20 times with the valve open...then close it and jack it up. Hopefully it will go to the full extention even if its slow. Once its at the top...pump it 4 or 5 more times to bleed off the air. Open her back up and mash her down and hopefully that will handle the problem. Its been a while since I messed with one but I think thats the way I did it and it worked.

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AD fm (AR)

01-21-2000 14:57:27




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 Re: Re: Re: Re: How to refill bottle jack ? in reply to Well...., 01-21-2000 13:52:40  
If by chance someone has unscrewed the control valve all the way out the little ball valve that is in some jacks may have been lost and that will keep the shut off valve from seating tight enough to hold the pressure.
To bleed the air from lift chamber.Some times you can open the control valve and then stand on the base and pull up on the lift post to draw fluid into the chamber then turn the jack upside down and push down and that will expell the air that is trapped in the lift post chamber. Then close the control valve,pump up the jack. Invert jack and open the control valve and expell the air, repeat procedure until you no longer hear the air or the lift post is solid under a load with no spring if load is removed.
DO NOT pump lift handle with jack in inverted position or while laying on side opposite the control valve as this will force air into the lift chamber.

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