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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, 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, 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 11-21-2015, 08:08:51 AM
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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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