<![CDATA[Hydraulic excavators are subjected to external digging resistance and gravitational loads that are transmitted through the bucket, arm, boom, and supporting structure. Understanding this load path is important for identifying the force distribution and critical regions of the working mechanism. This study investigates the force and load distribution in the working mechanism of a Takeuchi TB150C excavator under a quasi-static condition. The analysis combines Free Body Diagram (FBD) modeling, force and moment equilibrium, and equivalent beam analysis. The input data were obtained from field observation, component measurements, technical manuals, and supporting engineering references. The loads considered include component self-weight, material weight, soil resistance, hydraulic cylinder forces, and pin reactions. The results show that the bucket cylinder force required to maintain equilibrium was 27.54 kN. The resultant bucket load used in the equivalent arm analysis was 14.001 kN. For the boom equivalent beam, the calculated vertical reaction and support moment were 85.384 kN and 249.15 kN.m, respectively. The maximum bending moment obtained for the arm was 28.266 kN.m. The load was transmitted sequentially from the soil to the bucket, bucket pin, arm, boom pin, boom, upper structure, swing bearing, undercarriage, and track system. The SFD and BMD results indicate that the boom and arm support regions experience the largest internal actions. Therefore, these regions are identified as the most relevant locations for further stress, deformation, and fatigue investigations. Keywords: excavator, force analysis, load distribution, static analysis, working mechanism.]]>
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