CAT 8I-4472 BEARING-GEAR

CAT 8I-4472 is a Caterpillar original single-row cylindrical roller bearing, suitable for gear shaft support components such as gearboxes and transfer cases. It withstands heavy radial loads and high-speed rotation, ensuring gear meshing accuracy and transmission efficiency. The following is precise original part information:

Core Technical Parameters
Item Details
Part Model: CAT 8I-4472 (8I4472) Single-row cylindrical roller bearing (without cage assembly, including inner ring, outer ring, and roller assembly), weight approximately 0.85 kg (1.87 lb), suitable for radial positioning of gear shafts, used with spacers and locknuts.

Core Material: High-carbon chromium bearing steel (52100/SUJ2), rings and rollers are integrally hardened, hardness HRC 60-64, roller surface ultra-finely ground, raceway roughness Ra≤0.2 μm, excellent fatigue resistance and wear resistance.

Key Dimensions: Inner Diameter 65 mm (2.559 in), outer diameter 120 mm (4.724 in), width 23 mm (0.906 in), roller diameter 10 mm, quantity 18, inner ring to shaft fit tolerance H7, outer ring to housing fit tolerance J7

Structural Features: Single-row full complement roller design (without cage), radial load capacity 30% higher than caged bearings, suitable for low-speed heavy-duty gear shafts, rollers and raceways in line contact, uniform load distribution, high rotational accuracy

Compatible Machines: CAT 950GC/962GC loaders (gearbox axle 2), 140M graders (transfer case output shaft), 320GC excavators (slewing gearbox sun gear shaft), and other engineering machinery transmission systems

Accessories: Compatible spacers 8T-4127, lock nuts 6V-7853, seals 456-1559, shaft retaining rings 586-7419 Core Functions and Structural Features

Heavy-duty Radial Load Bearing: The full complement roller design is suitable for pure radial heavy-duty conditions, capable of withstanding large radial forces generated by gear transmissions, ensuring no radial runout of the gear shaft, and suitable for heavy-duty transmission components such as gearboxes and transfer cases.

High Rotational Precision: The inner ring is precisely fitted to the shaft, and the outer ring is precisely fitted to the housing (H7/J7 tolerance), with radial clearance controlled within 0.01-0.03 mm, ensuring stable gear meshing backlash, reducing transmission noise and vibration, and improving transmission efficiency.

Strong Wear Resistance and Fatigue Resistance: High-carbon chromium bearing steel is hardened, and the rollers and raceways are ultra-precision ground, reducing the coefficient of friction, suitable for high-speed rotation (maximum speed 3000 rpm) and high-frequency impact conditions, extending bearing life.

Compact Installation Fit: With a width of only 23 mm, it fits the compact installation space of gearboxes, and the axial position can be adjusted by spacers, adapting to the layout requirements of multi-axis gear transmission systems.