CAT 8I-4493 BEARING

CAT 8I-4493 is a Caterpillar imperial single-row tapered roller bearing (including inner ring/outer ring/roller assembly), suitable for heavy-duty applications such as gearboxes/final drives, capable of withstanding radial and bidirectional axial loads, ensuring stable power transmission, and offering strong adaptability and durability. Cat®… The following is the core information:

Core Technical Parameters
Item Details
Part Model: CAT 8I-4493 (8I4493) Single-row tapered roller bearing, used in gearbox planetary carriers, final drives, etc., is an imperial bearing (supplied as a set)

Material: 52100 high-carbon chromium bearing steel, rollers/inner and outer rings are quenched and tempered (HRC60-64), rollers feature a convex design to reduce contact stress and prevent fatigue pitting

Key Dimensions: Inner diameter 34.925mm (1.375in), outer diameter 73.025mm (2.875in), width 24.608mm (0.969in), cone angle 10°30′, suitable shaft diameter 34.93-34.95mm, mounting hole diameter 73.03-73.05mm, clearance 0.012-0.025mm

Compatible Models: CAT For small and medium-sized equipment such as 305.5E2/306E2 excavators and 420F2 loaders, this bearing is used in the gearbox’s second shaft/differential and final drive reduction mechanisms, suitable for speeds ≤3500rpm and heavy-duty conditions.

Performance Parameters: Radial rated dynamic load 62kN, static load 78kN, limiting speed (oil lubrication) 4200rpm, operating temperature -40℃ to 120℃, impact load ≥120kN, suitable for cyclic load variations.

Core Functions and Structural Features:

Composite Load Bearing: The tapered roller structure can simultaneously withstand radial heavy loads and bidirectional axial loads, adapting to the complex forces of gearboxes/final drives, preventing shaft movement, and ensuring stable power transmission (Cat®…).

High Durability: Special heat treatment and roller crown design reduce contact stress, minimize wear and pitting, suitable for harsh conditions such as dust and vibration, extending bearing life and reducing replacement frequency.

Precise Fit: Strictly controlled imperial dimensional tolerances ensure precise fit with journals and mounting bases, preventing loosening or misalignment after installation. This guarantees shaft rotational accuracy, reduces operational vibration and noise, and prevents premature failure of gears and other components.

Complete Set Design: Includes inner ring, outer ring, rollers, and cage for easy replacement without the need for additional matching parts, ensuring overall transmission system performance is identical to the original.