Atlas Copco CoPro Gasoline Jackhammer Breaker Gas Powered Freedom!.What you get with the Jackhammer Jet System Instruction manual on how to install and run the Jackhammer Jet System NEW!!! ‘ of PSI Rated Hydraulic hose to attach to your Jackhammer ‘ of impact resistant hose rated up to PSI of water pressure.A breaker is a powerful percussion hammer fitted to an excavator for demolishing concrete structures or rocks. It is powered by an auxiliary hydraulic system from the excavator, which is fitted with a foot operated valve for this purpose. Additionally, demolition crews employ the hoe ram for jobs too large for jackhammering or areas where blasting is not possible due to safety or environmental .Other kinds of jackhammers. Not all jackhammers use compressed air, so it’s a bit misleading to refer to them all, generi.y, as “pneumatic drills.”.