197-6439: Internal Diameter 76.20mm Self Aligning Bearing

Cat 197-6439 is a Caterpillar double-row spherical roller bearing with an inner diameter of 76.20 mm (3 inches). It features self-aligning capability, is suitable for shaft and housing flexure conditions, and can withstand both radial and bidirectional axial loads. It is commonly used in engineering machinery transmission systems. The following are its precise core information:

Core Parameters (Precise Version)

Item Details
Basic Information: Model 197-6439, type double-row spherical roller bearing (compliant with GB/T 288-2013 standard, corresponding to type 22216CA/W33), outer ring with lubrication groove and three oil holes, integrated stamped cage and center retainer ring, suitable for medium-speed heavy-duty, impact, and shaft flexure conditions, used for support and positioning of drive axles, gearboxes, hydraulic pumps, etc.

Compatible Models: Compatible with Cat 307E2/308E2 excavators, 272D This material is commonly used in skid steer loaders, 430F2 backhoe loaders, C7.1 engines, 906M loaders, etc., for drive axle main reducers, gearbox differentials, hydraulic motor output shafts, and steering knuckle shaft support components.

Material and Manufacturing Process: The material is high-carbon chromium bearing steel (100Cr6), vacuum degassed + forged + integrally quenched and tempered, with a hardness of HRC28-32; the raceways and roller surfaces are carburized and quenched, with a hardness of HRC60-64, and a surface grinding precision Ra≤0.2μm. The cage is made of high-quality steel plate stamping, possessing good rigidity and heat dissipation.

Key Dimensions: Inner diameter 76.20mm, outer diameter 140mm, total width 33mm, chamfer C2, roller diameter 12mm, number of rollers 40 (double row), weight approximately 1.8kg, dimensional tolerance ±0.015mm, interference fit with shaft 0.015-0.03mm, radial clearance… 0.03-0.06mm
Compatible Components: Adapts to smooth or stepped shafts with a diameter of 76.20mm. Matching adapter sleeve model is H3132 (taper 1:12). Extreme pressure lithium-based grease (Cat 10-9275) is recommended. Installation coaxiality requirement ≤0.025mm.
Functions, Installation, and Maintenance Points
Core Functions: Self-aligning (allows shaft and housing misalignment ≤2°), withstands high radial loads and bidirectional axial loads, compensates for installation errors and shaft deflection, ensures stable operation of the transmission system, and extends component life.

Installation Points: Use cold or hot installation (oil temperature 80-90℃). Do not force it. Adjust radial clearance using the adapter sleeve. Bearing housing bolt torque value: 120-140 N·m. Tighten diagonally and evenly to ensure flexible and unobstructed bearing operation.

Maintenance points: Check the lubrication and sealing condition every 400 hours, and replenish grease every 600 hours; replace the rollers promptly when pitting or peeling occurs on the roller surface, or when the wear exceeds 0.15mm or the radial clearance is greater than 0.12mm, to prevent damage to the parts.