This is a self contained air hammer- the electric motor drives one cylinder, usually thru a gear that reduces the speed, and then thru a linkage, which drives the piston that compresses air. Then, the valving system allows that air to drive the second cylinder, the front one with the ram.
This hammer is capable of continuous blows- if you read the spec sheet I posted above, you can see it will run at 120 blows per minute- OR it can be used in single blow mode.
Most hammers like this do not have a reliable single blow mode.
If they are well maintained, and you are lucky, a skillful operator can usually do one hit, but not always.
Some hammers, for whatever reason, just never can be made to do single blows, always hitting two or three times, no matter how quick you are on the treadle.
For closed die forging, single blow is prefered, so you dont get multiple impressions from the die.
And for many freehand open die forgings, there are times when you want one hit.
The workpiece may bounce slightly from the first hit, then a second hit is slightly out of registration, making for a ruined workpiece.
To be able to predictably get one hit, with a hammer this powerful, is very useful, and not a standard feature.
But a hammer like this, new, today, is about a $200k to $300k tool, and that is for a chinese made hammer.
IF such a machine was still made in the USA, I would imagine 2014 prices to be closer to a half million.
There are only a few companies that need such a machine, and they generally buy reconditioned used machines, or new from China- because the time line, and uncertainty of costs, for refurbishing a machine like this are unknowns.
It could be great, and just need moving, footings, and electrical supply- ten or twenty grand, at commercial prices.
Or, it could need major work.
Just to diagnose it on site would require renting a decent sized forklift, and pulling the ram- a day or two of work by experienced guys.
Until the ram was pulled out, and the cylinder bore inspected, its still scrap.