The SM 1252 is a heavy-duty Starter Drive (Self Drive) Full Kit specifically engineered for the Volvo FM 9 series of heavy commercial trucks. Featuring a reinforced 11-tooth pinion, this kit is designed to manage the extreme cranking torque required for the Volvo D9A and D9B engines. As a "Full Kit," it includes the necessary internal components to provide a complete overhaul of the starter's engagement system, ensuring "first-turn" reliability for long-haul and construction logistics.