178-4641: Bearing – Cup(Debris Resistant)

CAT 178-4641 is a Caterpillar single-row tapered roller bearing outer ring, suitable for drive axles, gearboxes, and other components in heavy-duty equipment. It is used in conjunction with the inner ring and rollers to bear radial and unidirectional axial loads. Key information is as follows:

Key Parameters
Item Details
Type: Single-row tapered roller bearing outer ring, standard taper angle 15°~20°, suitable for mating inner rings and roller assemblies, withstands radial + unidirectional axial loads, suitable for heavy-duty impact conditions
Dimensions (Metric/Imperial): Inner diameter 127.00mm (5.000 inches), outer diameter 190.50mm (7.500 inches), width 38.10mm (1.500 inches), taper 1:12, suitable for corresponding inner rings and roller assemblies
Material: High carbon chromium bearing steel (AISI 52100), quenched and tempered, hardness… HRC60-64, ultra-fine ground surface, roughness Ra≤0.05μm, improving contact fatigue life.

Precision: Outer diameter tolerance ±0.015mm, raceway roundness tolerance ≤0.008mm, cone angle tolerance ±0.05°, ensuring precise fit with the inner ring and rollers, reducing operating noise.

Matching method: Transition fit (H7) with the bearing housing bore, suitable for the positioning requirements of heavy-duty equipment during long-term operation, preventing outer ring rotation.

Suitable scenarios: Suitable for drive axle main reducers, gearbox input shafts, and engine crankshaft rear ends of equipment such as Cat 980H loaders, D8T bulldozers, and 352F excavators. Used in conjunction with the inner ring and roller assembly to withstand heavy loads and impact loads, ensuring smooth operation of the equipment’s transmission system.

Suitable for equipment overhauls or when the bearing outer ring is worn, allowing for individual replacement of the outer ring without replacing the entire bearing assembly, reducing maintenance costs.

Performance Characteristics
High-carbon chromium bearing steel construction, with a contact fatigue life ≥1000 hours, approximately 20% longer than ordinary bearing steel outer rings, suitable for heavy-duty applications.

Ultra-precision ground raceways result in a low coefficient of friction and operating noise ≤58dB, suitable for components in equipment transmission systems requiring high stability.

Standard tapered angle design allows for adjustment of axial clearance to accommodate different loads and speeds, extending bearing life.

Matching and Replacement
Matching Inner Ring: 178-4642; Matching Roller Assembly: 178-4643; Matching Cage: 178-4644. Complete replacement of these sets is required to ensure bearing performance.

Direct Replacement: 178-4645, 198-3173. Interchangeable and suitable for the same equipment and installation conditions.