CAT 321-6281 BUSHING

CAT 321-6281 is a Caterpillar high-hardness alloy steel track bushing, compatible with excavator/loader chassis track links. It provides rotational support between pins and links, withstands heavy loads and impacts, and improves the wear resistance and lifespan of the track system. It has strong compatibility with Cat®… The following are the core information and key points:

Core Technical Parameters

Item Details
Part Model CAT 321-6281 (3216281) Track Bushing (Rotary Type), compatible with track link pin holes, used in chassis running systems to ensure smooth track operation Cat®…

Material 42CrMo alloy structural steel, quenched + tempered (HRC58-62), surface nitrided, wear-resistant layer thickness 0.8-1.2mm, impact resistant, fatigue resistant, suitable for heavy-duty conditions

Key Dimensions Inner diameter 50.8mm, outer diameter 76.2mm, length 70mm, wall thickness 12.7mm, 5° chamfer at both ends, compatible pin diameter 50.81-50.83mm, link pin hole diameter 76.2H7, installation tolerance ±0.02mm

Compatible Models CAT 320D/320D2/323D For excavators and 966M/972M loaders, this product is used for track link kingpin bushings, compatible with pins 321-6282, suitable for speeds ≤50rpm.

Performance Parameters: Radial rated load 120kN, ultimate load 180kN, operating temperature -40℃ to 120℃, suitable track tension 80-100mm, maintenance cycle 2000 working hours.

Core Functions and Structural Features:

Heavy Load Bearing: The alloy steel structure can withstand heavy radial loads and impact loads during track movement, suitable for complex road conditions, preventing direct contact between the link and the pin, reducing wear, and ensuring stable operation of the track system.

High Wear Resistance: Surface nitriding treatment and high-hardness materials significantly improve wear resistance, suitable for harsh working conditions such as dust and mud, extending the service life of the track bushings and reducing replacement frequency.

Precise Fit: Strictly controlled dimensional and geometric tolerances ensure precise fit with pins and chain link pin holes, preventing loosening or misalignment after installation. This guarantees the rotational accuracy of the track links and reduces vibration and noise during operation (Cat®…).

High Compatibility: Perfectly matches original track pins and links, allowing for easy replacement without additional adjustments, ensuring the overall performance of the track system is consistent with the original.