KOYO HICAPLM50134910 Wheel Bearing

The KOYO HICAPLM50134910 wheel bearing is a premium-quality, precision-engineered tapered roller bearing unit designed to meet automotive industry standards for high load capacity and durability. As part of the Hi-Cap (High Capacity) series from renowned Japanese bearing manufacturer KOYO, it features optimized internal geometry and specially heat-treated rolling elements, ensuring minimal internal friction and exceptional service life even under extreme operating conditions.

Technical Specifications

• Manufacturer: KOYO
• Part Number / SKU: HICAPLM50134910
• Component Type: Tapered roller wheel bearing (cone and cup assembly / LM501349 - LM501310)
• Design: Hi-Cap (high-capacity tapered roller design)
• Load Capacity: Accommodates simultaneous high radial and significant unidirectional axial loads
• Material Quality: High-purity, hardened chrome steel alloy with a wear-resistant raceway finish

Wheel Bearing Function and Purpose

The wheel bearing is one of the most critical safety components of the suspension, providing the mechanical connection between the wheel hub and the axle spindle. Its function is to ensure smooth wheel rotation with minimal resistance while absorbing dynamic forces generated by vehicle curb weight, acceleration, braking, and cornering. Thanks to its tapered roller configuration, this structural component delivers outstanding rigidity and load distribution across the chassis system.

Typical Symptoms of Wear and Failure

Due to severe operating stress, mechanical wear, loss of lubrication, or moisture ingress, wheel bearings gradually wear out. Common signs indicating that the bearing requires replacement include:

• A continuous humming, droning, or grinding noise from the suspension that increases proportionally with vehicle speed.
• Wheel running noise that changes in pitch or intensifies during load transfers (such as when cornering).
• Excessive end play or looseness at the wheel hub when inspected on a lift.
• Abnormal heat buildup at the wheel hub after driving.
• Vibrations emanating from the running gear that can be felt through the steering wheel or vehicle body.