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Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

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 online now
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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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Old 11-15-2015, 11:14:22 PM
I like oldstuff I like oldstuff is offline
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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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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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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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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 online now
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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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