This is a technical engineering drawing (sheet M-504) from the US Army Corps of Engineers for the Lower Granite Dam Turbine Intake Gate Hydraulic System Upgrades project. The detailed mechanical schematic provides cross-sectional views of critical hydraulic system components, specifically focusing on cylinder and support beam details (section A3) and piston stub rod and coupling details (section A13). The drawing includes specific technical annotations for anode and mounting configurations (section L12), with multiple detailed views illustrating the intricate mechanical design of hydraulic system elements. The document includes general notes in the top right corner and appears to be part of the technical documentation for a precise engineering upgrade to the dam's hydraulic systems.
