The lower and upper gear set H 74119 / H 74120 forms an essential part of the mechanical drive system in the Sulzer ASL25 engine, ensuring synchronized power transmission between rotating components. Precisely machined for accurate tooth engagement and optimal load distribution, these gears operate under continuous rotational forces, vibration, and thermal influence. Their robust design and hardened surfaces reduce wear and mechanical losses while maintaining stable torque transfer. By ensuring smooth interaction within the gear train, the lower and upper gears contribute directly to reliable engine timing, efficient mechanical performance, and long service life.