197-6440: Outer Diameter 158.75mm Self Aligning Bearing

CAT 197-6440 is a Caterpillar double-row spherical roller bearing with an outer diameter of 158.75 mm (6.25 inches). It is suitable for heavy-duty equipment drive systems. Key information is as follows:

Key Parameters
Item Details
Type: Double-row symmetrical spherical roller bearing, outer ring spherical raceway, inner ring double inclined raceway, self-aligning, capable of withstanding heavy radial loads and bidirectional axial loads, suitable for shaft deflection or misalignment, commonly used in differentials, drive axles, etc.

Dimensions (Metric/Imperial): Inner diameter 88.90 mm (3.5 inches), outer diameter 158.75 mm (6.25 inches), width 57.15 mm (2.25 inches), chamfer r min 3.5 mm, tapered bore (taper 1:12), suitable for adapter sleeve installation

Material: Inner/Outer ring: Chromium-molybdenum alloy steel (AISI 52100), hardened to a high hardness. HRC60-64; Rollers: High-carbon chromium bearing steel, ultra-precision ground; Cage: Stamped brass, tensile strength ≥400MPa, with good thermal conductivity and wear resistance.
Precision: ISO P6 grade, radial clearance C3, inner bore taper tolerance ±0.01mm, raceway roundness ≤0.005mm, ensuring operational accuracy and stability.
Rated Load: Radial basic rated dynamic load Cr 220kN, radial basic rated static load Cor 280kN, limiting speed: grease lubrication 1800r/min, oil lubrication 2400r/min.
Installation Method: Installed with a locking sleeve and lock nut, suitable for shaft diameters of 88.90mm. Preload should be controlled at a bearing clearance of 0.01-0.02mm to ensure secure installation and reduce vibration.
Suitable for: Cat 950K/L loaders, D6R bulldozers, 325D/329D. This bearing is used in equipment such as excavators for differential drive shafts and drive axle main reducer input shafts. It automatically compensates for angular errors (≤2°) between the shaft and bearing housing, making it suitable for heavy-load, vibration-prone conditions in mining and infrastructure projects, extending the service life of transmission components.

It is commonly used for replacement during equipment maintenance/overhaul, and is compatible with original adapter sleeves and lock nuts, improving maintenance efficiency.

Performance Characteristics: Double-row roller structure, high radial load capacity, approximately 50% higher than self-aligning ball bearings of the same size, capable of withstanding bidirectional axial loads, suitable for load variations under complex working conditions.

Spherical raceway design, self-aligning, effectively compensates for shaft deflection and installation misalignment, reduces local stress between rollers and raceways, and reduces wear.

The brass cage has good thermal conductivity, effectively dissipating heat generated during operation and preventing bearing overheating, suitable for medium- and high-speed operating conditions.

Matching and Replacement

Matching Components: Matching adapter sleeve H317 (inner diameter 88.90mm), lock nut KM17, locking washer MW17. It is recommended to replace them as a set to ensure installation accuracy and performance.

Direct Replacement: 197-6441, 197-6442. Interchangeable, suitable for the same equipment and installation conditions, with performance identical to the original.