CAT 333-8048 BEARING AS

CAT 333-8048 is a Caterpillar single-row tapered roller bearing assembly, compatible with Cat 3126 and C7 engines, 950G/962G loader gearboxes and rear axle differentials. It is used to withstand high radial and bidirectional axial loads and is a core load-bearing component of the transmission system, ensuring efficient power transmission and stable operation. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 333-8048, Type: Single-row tapered roller bearing assembly (including inner ring, outer ring, rollers, and cage), Material: Outer/Inner Ring 52100 Chromium Bearing Steel (quenched HRC60-64), Rollers 20CrMnTi (carburized and quenched HRC62-66), Cage: Stamped steel plate, Single Weight: Approx. 0.75 kg, Lubrication: Grease lubrication (recommended Cat Moly-Dee EP 2), Applicable Temperature: -40℃ to +120℃

Key Dimensions
Inner Diameter 60.00 mm (Tolerance 0/+0.02 mm), Outer Diameter 110.00 mm (Tolerance 0/-0.03 mm), Width 22.00 mm (Tolerance ±0.05 mm), Taper Angle 12°, Number of Rollers 16, Roller Diameter 10.5 mm 78.00 mm inner ring large end diameter, 98.00 mm outer ring small end diameter, chamfer C1.5×45°
Compatible Models and Applications: Compatible with the front end of the crankshaft of Cat 3126 and C7 engines, the output shaft of the gearbox of 950G and 962G loaders, and the rear axle differential. Installed in high-speed, heavy-duty transmission parts, bearing radial loads and bidirectional axial thrust.
Performance Parameters: Basic rated dynamic load 85 kN, basic rated static load 110 kN, limiting speed 4200 rpm, rated axial load 50 kN, coefficient of friction μ≤0.005 (grease lubrication), sealing class IP65, bearing rated life 9000 hours.
Structural and Performance Advantages: High-hardness bearing steel material: 52100 chromium steel, quenched, possessing high wear resistance and fatigue resistance, suitable for harsh working conditions such as mining and infrastructure, with a lifespan more than 60% longer than ordinary carbon steel bearings.

Single-row tapered roller design: Capable of simultaneously withstanding radial and bidirectional axial loads. The 12° cone angle matches the force characteristics of the transmission system, ensuring positioning accuracy and stability during high-speed operation.

Stamped steel cage: Lightweight and high-strength, effectively separating the rollers, reducing friction, improving heat dissipation during high-speed bearing operation, and reducing roller wear.

Standardized assembly: Strict dimensional tolerances, compatible with original equipment manufacturer (OEM) transmission system mounting holes, requiring no additional machining. Quick replacement is possible during maintenance, meeting the efficient maintenance needs of heavy equipment.

Installation and maintenance points: Before installation, clean the bearing, journal, and bearing housing surfaces. Check for cracks in the bearing and no roller jamming. During installation, the inner ring interference should be 0.02-0.04 mm, the outer ring clearance with the bearing housing should be 0.01-0.02 mm, and the bolt torque should be 180-200 N·m. Ensure the bearing-shaft coaxiality is ≤0.03 mm. Avoid impacts that could deform the bearing or damage the rollers.

During maintenance every 1200 hours, check for: bearing clearance exceeding 0.15 mm, pitting on the outer/inner ring, or seal failure; replace immediately. Regularly replenish grease, adding 50-80 g every 600 hours to ensure adequate bearing lubrication.

Prioritize genuine manufacturer (OEM) bearing assemblies. Aftermarket parts may have insufficient material purity or low roller precision, easily leading to bearing burn-out, abnormal noises in the transmission system, and other malfunctions, endangering safe equipment operation.