Figure 12-64.-Buffer bolt.small plungers.A weighted piston rests on theseplungers. Ajar of the hammer while in operation forcesthe piston and plunger down and thus drives a smallamount of oil past the ball check valves and into the feedlines. Two of the feed lines have terminal checks thathold back the high pressure of the combustion chamber.A small pipe plug is provided at each terminal to observethe flow of oil.NOTE: Fill the oil reservoir with high temperature,high detergent No. 30 to No. 40 viscosity diesel enginelubricating oil with a flash point of 425° to 450°.CYLINDER.— The cylinder is a stress-relievedweldment made from steel tubing and plate with a borespecifically chrome-plated to prevent seizing, galling,and rapid wear. The shape of the shell forms a fuel andoil tank as well as protection for the fuel and oil pumps,lines, and trip mechanism. Cover plates, front and backprovide easy access to the components. For safety intransporting and rigging the hammer, the ram piston islocked in place by a travel plug found midway on thefront of the hammer. This plug should be removed whenthe hammer is rigged and ready for operation and shouldFigure 12-65.-Maximum ram-piston overstroke.be replaced when the hammer is removed from the leadsor is laid horizontal. The ram piston is a chrome-steelforging that has eight compression rings.BASE ASSEMBLY.— The anvil block in the baseassembly group is held in place by buffer bolts and hascompression rings identical to those on the ram piston(fig. 12-64). Radial thrust or side thrust to the hammeris transmitted to the leads through the thrust bearing. Avibration damper, concealed under a shroud, isolates thecylinder from the shock vibration of the anvil. Bufferbumpers absorb the recoil from the Belleville washertype of buffer springs connected to the anvil by bufferbolts, dampening overtravel and holding the hammertogether. Pins lock the buffer compression nuts to thebuffer bolts and are held captive by the buffer housing12-46
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