Product Introduction

The 390A / 7781 Auxiliary Box Output Tapered Roller Bearing is a high-quality transmission component designed for SINOTRUK FAST gearbox truck spare parts applications. It is engineered to support the output shaft of the auxiliary gearbox system, providing stable rotation, accurate shaft positioning, and reliable power transmission performance under heavy-duty operating conditions.

Manufactured according to OEM standard quality requirements, this tapered roller bearing features precision-machined rollers and raceways combined with durable bearing steel construction. The tapered roller design allows effective handling of combined radial and axial loads, reducing friction, improving rotation efficiency, and increasing resistance to wear during continuous operation.

The 390A / 7781 bearing is commonly used in SINOTRUK FAST manual gearbox auxiliary box assemblies, supporting output shaft components and related drivetrain mechanisms. It helps maintain gearbox alignment, reduce vibration, and improve the overall durability of transmission systems used in heavy trucks, construction vehicles, and long-distance transportation applications.

As an aftermarket replacement part, this auxiliary box output bearing is suitable for gearbox repair workshops, fleet maintenance companies, transmission specialists, and wholesale truck spare parts distributors. With OEM-standard quality, direct replacement compatibility, and reliable service life, it provides an effective solution for SINOTRUK FAST gearbox maintenance and repair requirements.

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