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@ca.rr.com>
To: <shop-talk@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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