The SM 4826 is an ultra-heavy-duty Starter Drive (Self Drive) engineered specifically for the Caterpillar 42MT series starter motors. Utilizing the robust DEL.TYPE (Delco-style) architecture, this unit features a reinforced 11-tooth pinion and a high-density 19-spline internal configuration. It is precision-calibrated to handle the extreme cranking torque required for large-displacement Caterpillar diesel engines used in earthmoving and construction machinery.