[Shop-talk] air over hydraulic bottle jacks

[Arvid Jedlicka]

Actually it seems like the air piston assembly just "pumps" the original 
hydraulic pump plunger up and down. So the air enters the cylinder and 
pushes down on the original plunger [or something close to the original 
plunger] until the air piston reaches a relief port. Then the air piston 
retracts and then takes another shot at the hydraulic plunger. It really is 
just "doing the pumping" for you. It sounds like a very slow jack hammer 
when it works.

Hope that makes some sense,
Arvid


----- Original Message ----- 
From: "Randall" <tr3driver at ca.rr.com>
To: <shop-talk at autox.team.net>
Sent: Thursday, October 30, 2008 4:41 PM
Subject: Re: [Shop-talk] air over hydraulic bottle jacks


>> I got the same (type) jack for the same purpose last year.
>
> So, what happens when what you are pressing on breaks loose ?  Does the 
> ram
> then extend all the way as the air expands ?
>
> Also, I assume that silver cylinder starts out full of hydraulic fluid,
> which gets displaced by the air.  How does it get refilled for the next
> time?
>
> Randall
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