air over hydraulics info wanted

Assuming it's the 20 ton, SKU 41487, I have one, pulled out the assembly/operating instructions, doesn't spec the CFM. More air at 90 psi will make it pump longer. If your air pressure drops below 90 psi it will run slower. I run an air-over-hydraulic 8-ton long-throw jack all the time on my shop hoist, and that one has to run for a long time to move all the way, and it completely outruns my compressor which delivers an honest 17 CFM. (5 horse 2-stage Quincy) But the compressor catches up quickly.

I use the 20 ton in my shop press, and the ram rarely has to extend over a couple of inches. I don't recall ever having the 20-ton exceed my compressor's ability to deliver.

Sorry for the non-definitive answer, hope it helps a little.

GWE

Grant, how do you like that jack, I looked into it also and hesitated to buy. Would appreciate some feedback.

I like mine fine. Really exceptional value for the money. A blacksmith I know named Steve Smith (posts here on occasion) also has one and I believe he says he uses his in his forging press and likes it too.

Even if the air-over unit broke entirely it would still work fine as a regular bottle jack, in other words you can always pump it by hand.

Mine's relatively nicely made and works just fine.

When they're on sale for $79.99 (most of the time) and you can score one of those elusive 20% off coupons (which seem to have disappeared from the place I'd bookmarked, anyone know where they went?) they're very inexpensive.

I use mine on a 20 ton shop press.

GWE

I got one and put it in my 20T H frame press. I like it and haven't found any faults. Hard to beat at about $65 with coupons and whatnot.

Pete C.

Weren't me. My forging press has a plain 6" hydraulic cylinder I got at a fine junkyard in Colorado (Martin's Salvage). It started life as one of the cylinders in a trash truck. I run it off of a log splitter pump (2 speed).

Steve

Hi Grant,

It looks like they've made some changes, no duh :)

Try: