CAT 256-4837 CAP-BEARING-GD

CAT 256-4837 (2564837) is a Caterpillar single-row tapered roller bearing, suitable for the final drive or drive axle of wheel loaders/excavators. YM indicates a high-quality replacement. The following are the core technologies and compatibility information:

Core Technical Parameters
Item Details
Part Model: CAT 256-4837 (2564837) Single-row tapered roller bearing (YM quality, suitable for final drive/drive axles, withstands radial + unidirectional axial loads, ensuring heavy-duty positioning)

Core Material: Bearing steel (GCr15SiMn, HRC 60–64), raceway ultra-precision ground (Ra≤0.08 μm), cage: stamped steel plate, surface anodized for rust prevention, compatible with lithium-based grease (NLGI 2, -20℃ to +120℃)

Key Dimensions: Inner diameter 100 mm, outer diameter 215 mm, width 58 mm, taper angle 10°, raceway curvature radius 52 mm, mounting surface runout tolerance ≤0.02 mm, compatible with M20×1.5 bolts (mounting hole spacing 190 mm)

Single weight: Approx. 6.8 kg (14.99 lb)

Compatible models: CAT 966K/972K wheel loaders (final drive), 326D/329D excavators (drive axle), compatible final drive models 9J-3000/9J-3001, often used with 6W-4765 retainer

Operating compatibility: Rated radial load 380 kN, rated axial load 180 kN, limiting speed 2200 rpm, operating temperature -30℃ to +120℃, suitable for heavy-duty impact conditions on construction sites

Core functions and structural features:

Heavy load bearing: Single-row tapered roller design, compatible with final drive/drive axle, withstands high radial loads… Unidirectional axial combined load suppresses shaft movement and ensures positioning accuracy for heavy-duty transmission.

High-precision fit: Ultra-precision grinding of the raceway and precise machining of the tapered surface ensure a 0.01–0.03 mm clearance with the bearing housing, guaranteeing preload accuracy and reducing impact and noise.

Impact-resistant and durable: GCr15SiMn steel is hardened, resisting impact loads of 420 kN. The stamped steel cage resists impact deformation, adapting to complex on-site conditions.

YM quality assurance: YM is a Caterpillar-approved high-quality replacement standard. Materials, dimensions, and tolerances are consistent with the original manufacturer, offering near-original compatibility and durability at a higher cost-performance ratio.

Modular matching: Modularly matched with the 6W-4765 retainer, simplifying assembly and adapting to CAT final drive standard mounting interfaces.

Installation and maintenance points:
Installation specifications: Clean the mounting surface, ensuring it is free of rust and oil. Bearing housing tolerance +0.01–+0.03 mm ensures precise fit.

Install by hot pressing (oil temperature 80–90℃, heating for 20–30 min) or cold pressing. Do not strike the end face to avoid damaging the raceway.

Use M20×1.5 bolts (grade 10.9) for symmetrical tightening, torque 180–200 N·m, controlling preload 0.02–0.04 mm.

Maintenance Recommendations: Inspect every 1000 working hours for cracks, raceway peeling, seal damage, and grease leakage. Replace promptly.

Before long-term storage, rotate the bearing 5–8 times to ensure even grease coverage of the raceway, preventing dry friction and corrosion.

Replacement: Prioritize CAT original parts or YM/SEM/GD quality parts of the same specification, ensuring compatibility with the retainer and bearing housing.