K304523 Heavy Truck Transmission Needle Roller Bearing

Deep Application & Technical Narrative:

The K304523 is a specialized high-capacity radial needle roller and cage assembly designed explicitly for the main shafts of Fast Gear 12JSD200T and 12JSDX240T heavy-duty truck transmissions. Inside these massive 12-speed commercial gearboxes, space is highly restricted, yet radial load pressures from engine torque are immense. The needle roller design provides maximum load support within a minimal radial cross-section. Because transmission failure causes severe fleet downtime, we treat these components with absolute strictness. In our workshop, we manually verify the cage integrity and roller smoothness of every K304523 assembly, ensuring flawless high-speed rotation and reliable gear engagement for heavy transport vehicles.

• Customized B2B Supply & Packaging Solutions:

  To support our objective of supplying a full range of bearing types, we cater directly to commercial transmission remanufacturers. The K304523 is supplied in secure, oil-sealed packaging to preserve the micro-finished rollers. We offer custom branding for your B2B distribution network and facilitate efficient export routing to major heavy-duty automotive markets in Russia and South America.

• Targeted Technical Clarifications (FAQ):

• Q: Does this assembly include an inner or outer ring?

  A: No, the K series is a needle roller and cage assembly only; it is designed to run directly on the hardened transmission shaft and gear bore.

• Q: What is the primary function of this bearing in the 12JSD transmission？

  A: It supports the heavy radial loads of the mainshaft gears while allowing them to spin freely when not engaged by the synchronizer.