Doosan DXB 170h Hammer Attachment The new DXB 170h hammer attachment for Doosan DX225 and DX255 excavators is the first model in an upcoming line of Doosan hammer attachments. The hammer has an operating weight of 3,572 lb and fits into the 5,000-lb impact class. It has an operating pressure of 2,610 psi at a flow of 26.5 to 39.5 gpm. For more information, visit www.doosaninfracore.com.