KOYO HICAPLM4854810 Wheel Bearing

The KOYO HICAPLM4854810 is a premium tapered roller wheel bearing set (comprising the LM48548 cone/inner ring with roller cage and the LM48510 cup/outer ring) engineered to absorb high radial and axial forces. Developed by renowned Japanese bearing manufacturer KOYO, the "Hi-Cap" (High Capacity) technology ensures increased dynamic load capacity, optimized rolling element geometry, and exceptional wear resistance in vehicle wheel hub assemblies.

Technical Specifications

• Component Type: Tapered roller wheel bearing (inner and outer ring set)
• Inner Diameter (d): 34.925 mm (1.3750 in)
• Outer Diameter (D): 65.088 mm (2.5625 in)
• Total Assembly Width (T): 18.034 mm (0.7100 in)
• Inner Ring Width (B): 18.034 mm
• Outer Ring Width (C): 13.970 mm
• Material: High-purity, hardened alloy bearing steel
• Design: Heavy-duty (Hi-Cap) internal raceway and roller assembly

Function and Importance in the Suspension System

The wheel bearing is a critical safety and mechanical component in the vehicle chassis. Its primary function is to minimize friction between the rotating wheel hub and the stationary steering knuckle/spindle, while continuously supporting the vehicle weight and handling complex dynamic forces generated during cornering and braking. The tapered roller design is specifically tailored to manage unidirectional axial thrust loads and substantial radial loads with superior rigidity and running accuracy.

Typical Symptoms of Bearing Wear and Failure

• Growling or Humming Noise: A noise resulting from micro-cracking and spalling (pitting) on the raceways, which increases proportionally with vehicle speed and intensifies during load shifts while cornering.
• Overheating: Friction-induced heat buildup at the wheel hub caused by lubricant breakdown, insufficient lubrication, or improper pre-load clearance adjustment.
• Wheel Hub Play: Excessive mechanical free play resulting from wear on the rollers and raceways, leading to imprecise vehicle handling and uneven tire wear.
• Steering Wheel Vibrations: Shaking and vibration felt at higher speeds due to compromised suspension geometry and wheel alignment stability.