This 12JSDX240T-1707107 output shaft washer is designed for the FAST 12JSDX240T heavy-duty transmission. It installs on the gearbox output shaft to control axial clearance and absorb axial thrust during power transfer. Manufactured from high-strength alloy steel with surface hardening treatment for outstanding wear resistance. It reduces friction between rotating components and prevents abnormal axial movement and component damage. Suitable for heavy-load long-haul transportation and frequent start-stop operating conditions. Each washer undergoes thickness, flatness and hardness inspection before factory delivery. Solves common faults including output shaft shaking, abnormal noise and premature part wear. Essential thin wear spare part for overhaul of 12JSDX240T gearbox fitted on SHACMAN X3000.