SAHCMAN X3000 X5000 X6000 TRUCKS Transmission Rear Combined Tapered Roller Bearing 16JSS300T-1707109

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SAHCMAN X3000 X5000 X6000 TRUCKS Transmission Rear Combined Tapered Roller Bearing 16JSS300T-1707109

FUNCTION

1. Limit Load Capacity under Combined Loads: The tapered rollers feature a unique angled design, enabling them to simultaneously withstand extremely heavy radial loads and bidirectional axial loads. This ensures the output shaft remains firmly secured during critical moments such as truck startups and full-load uphill climbs.
2. Precise Positioning of the Output Shaft Assembly: Utilizing a precisely ground intermediate spacer, the double-row combined bearing controls internal axial clearance to a micron-level tolerance right at the manufacturing stage. This guarantees that the output shaft remains free of longitudinal shifting or radial runout during high-speed rotation, thereby indirectly safeguarding the downstream output shaft oil seal against oil leakage caused by eccentricity.
3. High Efficiency and Low Friction: Benefiting from advanced heat treatment processes, the raceway surfaces exhibit exceptional hardness and surface finish. Under splash lubrication from gear oil, this design minimizes frictional losses during high-speed rotation, effectively preventing bearing seizure or burnout during prolonged, high-speed vehicle operation.

DETAILS

Interconnection with Upstream and Downstream Components
1. Upstream Connection: Auxiliary transmission main shaft and speedometer gear. The inner ring of the bearing is press-fitted directly onto the output shaft, resting firmly against the speedometer sensor gear; this provides a stable radial center of rotation for the gear, thereby preventing runout that could lead to signal inaccuracies in the speedometer sensor.
2. Downstream Connection: 19109-2 dual-lip oil seal and flange yoke. The outer ring of the bearing is seated within the bearing bore of the auxiliary transmission's rear cover, with its rear face positioned immediately adjacent to the output shaft's rear oil seal. Should this bearing experience wear or looseness, the output shaft will develop eccentric oscillation; this condition can instantly rupture the downstream dual-lip oil seal, resulting in severe oil leakage from the transmission.

Typical Early Warning Signs of Bearing Damage
1. Metallic Clanking and Roaring: When the vehicle is traveling-whether under a light load or fully loaded-a continuous, metallic-friction roaring sound emanating from beneath the chassis, which intensifies as vehicle speed increases, typically indicates that fatigue spalling or pitting has occurred on the bearing raceway.
2. Risk of Gear Disengagement and Jumping: If the axial clearance of the bearing increases due to wear, it can cause the entire output shaft to shift back and forth during sudden acceleration or when lifting off the throttle. This axial movement of the shaft directly displaces the synchronizer, thereby triggering a serious malfunction involving the automatic disengagement of gears within the auxiliary transmission.

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