CAT 320-7344 BEARING

CAT 320-7344 is a Caterpillar genuine single-row tapered roller bearing, suitable for heavy machinery gearboxes, drive axles, or final drive systems, used to withstand combined radial and unidirectional axial loads. The following is pure raw data and does not include replacement parts information for Cat®…

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 320-7344, Type: Single-row tapered roller bearing (inner and outer rings + roller assembly), Material: High-carbon chromium bearing steel (GCr15), Weight: 2.45 kg, Suitable for maximum radial load 102 kN, maximum axial load 38 kN, Limiting speed: 2800 rpm, Operating temperature: -40℃ to +120℃, Suitable for general-purpose lithium-based grease/gear oil, Used in gearbox output shafts, drive axle differentials, final drives, etc., providing high rigidity and stable load transmission.

Key Dimensions (Metric/Imperial)
Inner diameter: 75.0 mm (2.953 in, tolerance 0/-0.015 mm), Outer diameter: 130.0 mm (5.118 in, tolerance ±0.12 mm), Width: 33.0 mm (1.299 in, tolerance ±0.1 mm), Number of rollers: 20 1 roller, 15.0 mm diameter, 24.0 mm length, outer ring raceway angle 12°, inner ring raceway angle 15°, taper 1:12, shaft fit tolerance k6, bearing housing fit tolerance H7.

Performance Parameters: Inner and outer ring surfaces hardened, hardness HRC 60-64, tensile strength ≥1800 MPa, contact fatigue life ≥8000 hours, rotational accuracy P6 grade, radial clearance 0.015-0.028 mm, grease filling 150±10 g, open sealing type (compatible with labyrinth/contact seals), capable of withstanding moderate impact loads.

Structure and Compatibility Characteristics:

Combined Load Compatibility: The tapered roller structure can simultaneously withstand radial and unidirectional axial loads, suitable for transmission components with bidirectional forces, such as gearboxes and drive axles. The taper design ensures uniform load distribution, reduces contact stress, and minimizes the risk of pitting corrosion.

Ease of Installation: The inner and outer rings are separable, facilitating individual installation and disassembly. Suitable for assembly scenarios with limited space, after installation, adjusting the axial preload optimizes bearing rigidity and operational accuracy, suppressing vibration and noise.

Operating Condition Compatibility: Made of high-carbon chromium bearing steel with quenching treatment, suitable for high-frequency vibration and impact conditions in engineering machinery. Resistant to gear oil and grease corrosion, with no significant wear or roller detachment risk over long-term use. Compatible with mainstream models such as Cat 966GC and 323GX.

Installation and Maintenance Points (Original Data)

Installation: Clean the bearing and mounting surfaces (free of oil and metal shavings). Hot-fit (≤100℃) or cold-press into the journal for the inner ring. Press the outer ring into the bearing housing. Adjust the axial preload according to the equipment manual (recommended preload torque 15-18 N·m) to ensure smooth and unobstructed bearing rotation, with a coaxiality ≤0.05 mm.

Maintenance: Check the bearing operating temperature (≤80℃) and noise every 2000 hours, and replenish grease or change gear oil; replace immediately if roller pitting, raceway wear, or cage deformation are found; apply anti-rust oil and seal for long-term storage to prevent bearing corrosion.