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Machine Shop and Tool Talk

Air in manual bottle jack


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  #1  
Old 11-15-2015, 08:01:41 PM
Dwayne Oxford Dwayne Oxford is offline
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Default Air in manual bottle jack

Bought a short 12T for $5 at flea mkt. with air trapped. When I was a kid I remember reverse flushing but have forgotten the procedure. Hope someone can relieve my ignorance.
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Old 11-15-2015, 10:43:12 PM
akuna akuna is offline
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Default Re: Air in manual bottle jack

I just fill with oil, pump up as much as it will go with out running out of oil, then open valve and push the ram down. Repeat until no more air in jack.

Looking forward to see if there is a different way.
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  #3  
Old 11-15-2015, 11:14:22 PM
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Default Re: Air in manual bottle jack

Open the valve and slowly pump it ~20 times. That usually purges the trapped air. Works on my extremely high quality chin jack every month.
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  #4  
Old 11-16-2015, 12:18:13 AM
Heins Heins is offline
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Default Re: Air in manual bottle jack

Pump the jack up all the way, turn the jack up side down and push the ram in all the way.
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  #5  
Old 11-16-2015, 11:06:42 AM
Dwayne Oxford Dwayne Oxford is offline
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Default Re: Air in manual bottle jack

Heins method I think is what we did or close. Seems we pulled the ram up. How's the air get in anyway? Be WAY better to stop it happening.
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  #6  
Old 11-16-2015, 11:47:31 AM
ronm ronm is offline
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Default Re: Air in manual bottle jack

Somebody probably used it laying on its side. Some jacks had an arrow showing which side to have up when using it sideways, some don't...if it's laid down with the pump up, it will suck air.
Or somebody used it low on oil...
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Old 11-16-2015, 02:46:47 PM
Heins Heins is offline
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Default Re: Air in manual bottle jack

You shouldn't pull the ram up, that would cause it to suck air. Pump the ram up.
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Old 11-18-2015, 05:36:05 PM
Dwayne Oxford Dwayne Oxford is offline
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Default Re: Air in manual bottle jack

Got the air out. Seems like it don't take in a full charge on upstroke but works ok. It's a Pro-Lift, Shinn Fu of Taiwan. I think it's got screw top but haven't been able to turn the top. Anybody got good way to hold the ram without skinning it up?
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Old 11-19-2015, 12:20:38 AM
akuna akuna is offline
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Default Re: Air in manual bottle jack

Quote:
Originally Posted by Dwayne Oxford View Post
Got the air out. Seems like it don't take in a full charge on upstroke but works ok. It's a Pro-Lift, Shinn Fu of Taiwan. I think it's got screw top but haven't been able to turn the top. Anybody got good way to hold the ram without skinning it up?
Make sure it is full of oil.

Try a plumbers strap wrench (not chain type) on the ram and pliers or pipe wrench on the top part. If that does not work you would have to make up a clamp out of metal or hard wood. Two blocks with the proper hole drilled in between them to fit the ram. Clamp in a bench vice as tight as you can get and try the pipe wrench. Rosin will help hold it. Same thing gun smiths do to turn barrels off.
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Old 11-19-2015, 10:08:39 AM
Heins Heins is offline
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Default Re: Air in manual bottle jack

Sounds like the seal in the small pump ram is bad and sucking air.
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Old 11-20-2015, 10:01:50 PM
Dwayne Oxford Dwayne Oxford is offline
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Default Re: Air in manual bottle jack

O ring on pump ram was small so I replaced it. Cup seemed good. Don't think it's sucking air now, just don't suck oil up fast. Does better if you pause at top of upstroke. Like oil is too thick or check valve is too small.
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Old 11-20-2015, 11:49:46 PM
akuna akuna is offline
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Default Re: Air in manual bottle jack

Have had inexpensive jacks with messed up check valves. Is it worth the time? Not remembering what it was and bottle jacks are easy to come by.
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Old 11-21-2015, 08:08:51 AM
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MoRo MoRo is offline
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Default Re: Air in manual bottle jack

Instead of buying el-cheep-o bottle jacks, new, I watch the garage sales. I've picked up 2-ton and 5-ton jacks for just a couple dollars. Worked like champs right off.
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Old 11-21-2015, 12:09:46 PM
dkamp dkamp is offline
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Default Re: Air in manual bottle jack

If it's slow to respond when lifting handle, it may be thick oil, or there may be a passageway full of crud (through the check valve, which is often the same as the control valve). With it being airlocked before, it's probably cruddy... and if it was leaking, someone probably put whatever thick oil in that they had. Suggestion would be to take off handle and pump, remove valve, dump out the oil, spray in some mild solvent, try to blow out any crud, then clean up and reassemble, fill it with a thinner oil... if you don't have any hydraulic jack oil, ATF, or even a 5w motor oil will work. Some guys will use brake fluid, but not such a great idea, as a leaky jack always winds up leaking on things that you don't want to lose paint off of...
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Old 11-21-2015, 12:11:56 PM
ronm ronm is offline
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Default Re: Air in manual bottle jack

Quote:
Originally Posted by Dwayne Oxford View Post
O ring on pump ram was small so I replaced it. Cup seemed good. Don't think it's sucking air now, just don't suck oil up fast. Does better if you pause at top of upstroke. Like oil is too thick or check valve is too small.
The pump on my press (not a bottle jack) acts like that-if you want a full stroke you have to pause a second to let the pump cyl. fill...it's not as bad now that the press is inside-when it had to sit outside the garage it was pretty slow in cold weather. Never bothered me enough to tear into it & find what causes it...I did change the oil & it made no difference.
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Old 11-21-2015, 02:43:02 PM
George Andreasen George Andreasen is offline
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Default Re: Air in manual bottle jack

Does it actually have "jack oil" in it? Don't laugh, there is such a critter and you can buy it by the gallon at most auto stores. Its viscosity is thinner than most oils so it moves quicker.

I filled my Harbor Fright garage crane with jack oil and it works FAR better than the yak fat that came with it......
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Old 11-21-2015, 09:34:21 PM
Dwayne Oxford Dwayne Oxford is offline
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Default Re: Air in manual bottle jack

Recon I've got the "bargain" affliction and like to get stuff working. I didn't drain the oil, just added "real" jack oil. May disassem. and look at valve block. THANX all.
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Old 11-22-2015, 09:32:52 AM
ShaneZahn ShaneZahn is offline
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Default Re: Air in manual bottle jack

Here;s a good reference site for servicing several types of jacks. Use the site map for your parts, drawings, instructions, Etc.
http://www.hcrcnow.com/
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Old 11-22-2015, 10:55:38 AM
sdowney717 sdowney717 is offline
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Default Re: Air in manual bottle jack

The bottle jacks I own have a rubber oil fill plug on the side.
I force the piston down, the use a small screw driver I press the rubber seal open on the side and air hisses out.
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Old 11-22-2015, 02:55:49 PM
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Default Re: Air in manual bottle jack

^ My 20 ton also has that little rubber 'programmed leak' feature. I have to store it in it's side with the plug up.
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