<![CDATA[This study evaluates the torsional deformation and stress distribution of a pump-turbine shaft system using the finite element method implemented in SolidWorks Simulation. Unlike previous studies that focused only on the turbine shaft, this research analyzes the mechanical response of the entire shaft system consisting of the thrust bearing shaft, pump shaft, and turbine shaft. The shaft model was developed based on the actual dimensions of the Tarum Barat hydraulic pumping system and analyzed under static torsional loading conditions. The shaft material was SCM4 steel (AISI 4140), assumed to be homogeneous, isotropic, and linearly elastic. A torque of 6016 N·m was applied to represent the operating condition, while boundary conditions were assigned at the bearing support locations. The simulation results indicate a maximum displacement of 0.663 mm, a maximum strain of 0.000993, and a maximum Von Mises stress of 360 MPa, all occurring in the turbine shaft region. The calculated safety factor of 1.72 indicates that the maximum working stress remains below the material yield strength of 620 MPa, confirming that the shaft system operates within the elastic region under the applied loading condition. These findings identify the turbine shaft as the most critical region in the shaft system and provide a basis for design evaluation and preventive maintenance of hydraulic pump shaft systems.]]>
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