CAT 320-7334 BEARING

CAT 320-7334 is a Caterpillar single-row tapered roller bearing used in drivetrain systems. It is suitable for medium-to-high speed and medium-to-heavy load applications and is commonly used in wheel ends, differentials, or gearboxes. The following is raw data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 320-7334, Type: Single-row tapered roller bearing (no cage, separate inner ring), Material: Chromium-molybdenum alloy steel, Weight: 5.23 kg (11.53 lbs), Operating Temperature: -40℃ to +150℃, Suitable for radial load ≤185 kN, axial load ≤240 kN, Corrosion Resistance: ≥120 hours salt spray, Surface Treatment: Carburizing and quenching, Hardness: HRC 60-64, Elastic Modulus: 207 GPa, Coefficient of Thermal Expansion: 11.8×10^-6/℃

Key Dimensions (Metric/Imperial)
Inner Diameter: 88.9 mm (3.500 in), Outer Diameter: 152.4 mm (6.000 in), Width: 41.28 mm (1.625 in), Roller Diameter: 14.29 mm, Number of Rollers: 24, Inner Ring Large End Diameter 106.36 mm, outer ring raceway diameter 138.11 mm, chamfer C2 mm, inner ring tolerance 0/-0.015 mm, outer ring tolerance 0/-0.020 mm, width tolerance +0.10/-0.05 mm, roundness ≤0.015 mm

Performance parameters: Basic rated dynamic load Cr=185 kN, basic rated static load C0r=240 kN, limiting speed 2800 rpm (oil lubrication)/1800 rpm (grease lubrication), contact angle 15°, clearance 0.015-0.035 mm, coefficient of friction ≤0.003, fatigue limit ≥420 MPa (10^7 cycles), assembly interference 0.018-0.030 mm
Structure and Adaptability

Separable Structure: The inner ring is separable for easy installation and maintenance. It is suitable for transmission components requiring individual clearance adjustment, such as wheel end bearing housings and differential output shafts. It allows for precise control of axial and radial clearance, improving operational stability.

Heavy-Duty Adaptation Design: Made of chromium-molybdenum alloy steel with carburizing and quenching processes, it is suitable for medium- and high-speed, medium- and heavy-duty applications in engineering machinery wheel ends, gearbox shafts, and differentials. It can withstand radial and bidirectional axial loads simultaneously, exhibiting strong resistance to impact and vibration.

High-Precision Raceway: The raceway surface roughness Ra≤0.4 μm ensures uniform contact between the roller and raceway, reducing localized stress concentration and extending bearing life. It is suitable for the transmission systems of Caterpillar loaders, excavators, dump trucks, and other equipment.

Compatible Models and Application Scenarios

Loaders: Front axle wheel ends and gearbox output shafts of models such as 966K and 972K, suitable for frequent start-stop and impact conditions during material loading and unloading.

Excavators: Models 336D2 and 349D2 use travel motor output shafts and rotary gearboxes, suitable for medium-to-high speed rotation and heavy-duty requirements in excavation operations.
Dump trucks: Models 770G and 772G use differentials and drive axle wheel ends, suitable for continuous high-speed operation in heavy-duty transportation.