CAT 297-7145 BEARING-GD

CAT 297-7145 (2977145) is a Caterpillar single-row tapered roller bearing assembly (YM indicates high wear resistance and precision quality). It is suitable for the final drive and drive axle differential of CAT 980K/982M loaders, D10T/D10R bulldozers, and other models, used to withstand combined radial and bidirectional axial heavy loads. The following are the core information:

Core Technical Parameters
Item Details
Part Model: CAT 297-7145 (2977145) Single-row tapered roller bearing assembly (YM designation, including inner ring/outer ring/rollers/cage, suitable for heavy-duty transmission conditions)

Core Materials: Inner ring/outer ring: SAE 52100 bearing steel, carburized and quenched, hardened layer 1.2–1.6 mm, hardness HRC 60–64; Rollers: Chromium steel (GCr15), surface Ra≤0.4 μm; Cage: Stamped low carbon steel, anti-roller skew

Key Dimensions: Inner diameter 120 mm, outer diameter 180 mm, width 45 mm, raceway taper angle 15°, suitable journal 120 mm (tolerance h6, 0–-0.035 mm), outer ring taper 1:12, installation interference 0.015–0.030 mm

Single Weight: Approx. 4.8 kg

Compatible Models: CAT 980K/982M loader (final drive input shaft), D10T/D10R bulldozer (drive axle differential), 966M loader (steering drive axle), used in high-load rotating parts of the transmission system

Operating Fit: Dynamic radial load 280 kN, limiting speed 2600 rpm, operating temperature -30℃ to +150℃, compatible with extreme pressure lithium-based grease (NLGI 2), contact fatigue life ≥10⁶ Stress Cyclic Reaction
Core Functions and Structural Features
Separable Structure: The inner ring (cone) and outer ring (cup) are separable, facilitating installation, disassembly, and maintenance, suitable for space-constrained transmission systems.

Conical Load Distribution: A 15° raceway cone angle ensures uniform radial and axial load distribution, reducing localized stress concentration and adapting to combined heavy-duty conditions.

Interference Fit for Torque Transmission: The inner diameter and journal have an interference fit of 0.015–0.030 mm, eliminating slippage, ensuring transmission accuracy, and reducing vibration and noise.

High-Precision Cage: The stamped steel cage has uniform spacing, precise roller positioning, suppresses skewness, and extends bearing assembly life.

Installation and Maintenance Points
Installation Specifications: Clean the journal and bearing housing. Journal Ra≤0.8 μm, tolerance h6 (0–-0.035 mm), hardness HRC≥58; bearing housing tolerance H7, surface free of scratches and burrs.

For assembly, heat the inner ring (≤120℃), applying even force with a sleeve against the inner ring end face to ensure tight contact with the shaft shoulder; for cold assembly of the outer ring, adjust the preload to the value in the model manual (e.g., 120–150 N·m for the 980K final drive).

Add extreme pressure lithium-based grease, filling 1/3–1/2 of the bearing’s internal space to prevent heat buildup at high temperatures.

Maintenance Recommendations: Every 1000 operating hours, check for raceway wear, spalling, and burning; replace immediately if the inner diameter clearance is >0.05 mm. Simultaneously check journal wear (>0.02 mm requires repair).

When replacing, prioritize original parts or YM certified parts to avoid confusion with similar models such as 297-7146.

Simultaneously check the lubrication channels, cleaning away impurities to prevent abnormal wear.