CAT 081-4872 70mm Inner Diameter Spherical Roller Bearing

CAT 081-4872 is a Caterpillar single-row self-aligning roller bearing (spherical roller bearing) suitable for rotor drives, gearboxes, or final drives of equipment such as excavators and loaders. It can compensate for the angular misalignment between the shaft and the bearing housing (≤2.5°), withstand heavy radial loads and light bidirectional axial loads, and is suitable for stable operation under impact and vibration conditions. Cat® Parts Store. The following is structured technical and application information:

Core Technical Parameters
Item Details
Basic Attributes
Model 081-4872, Type: Single-row self-aligning roller bearing (with seal), Material: Chromium steel (52100), Outer ring spherical, inner ring double raceway, surface carburized and quenched (HRC60-64), Single weight approximately 2.8 kg, Applicable temperature: -40℃ to +120℃, Corrosion resistance rating: IP54, Rated speed: 2200 r/min (grease lubrication), Recommended lubrication: Cat DEO-ULS 15W-40, Seal type: Contact rubber seal (nitrile rubber)

Key Dimensions
Inner diameter: 70 mm (shaft diameter tolerance h7), Outer diameter: 150 mm (bearing housing tolerance H8), Width: 35 mm (tolerance ±0.10 mm), Roller size: 12 mm × 28 mm (18, evenly distributed in a single row), Cage material: Stamped steel plate, Clearance rating: CN (radial clearance) 0.010-0.025 mm), chamfer 1.2 mm, installation interference 0.01-0.02 mm
Compatible Models and Applications: Compatible with Cat 320D2 and 336D2 excavators, 966M and 972M loaders, for rotor drive shafts, gearbox output shafts, and final drive reduction gearboxes. Supporting parts include bearing housing 532-9426, retainer 9R-2498, and gasket 7Y-0597. Rated radial load ≥220 kN, axial load ≥45 kN. Compensates for shaft deflection and installation errors, prevents bearing seizure, and reduces vibration and noise.

Performance Parameters: Rated dynamic load C≥240 kN, rated static load C0≥280 kN, fatigue life ≥8000 hours, limiting speed 2800 r/min (oil lubrication), coefficient of friction ≤0.002, allowable angular deviation ≤2.5°, sealing ring lip pressure 0.1-0.3 MPa, waterproof and dustproof, suitable for humid and dusty working conditions.

Structural and Performance Advantages:
* **Strong Self-Alignment:** The outer ring spherical design automatically compensates for angular misalignment between the shaft and bearing housing, suitable for shaft bending or misalignment during installation, avoiding wear on the roller edges and extending service life.
* **Heavy Load Bearing:** The single-row roller structure has a large contact area, capable of withstanding heavy radial loads and light bidirectional axial loads, suitable for impact and vibration loads during equipment operation.
* **Reliable Sealing:** The nitrile rubber contact seal effectively prevents dust and moisture intrusion, reduces grease leakage, is suitable for harsh working conditions, and reduces maintenance frequency.
* **Stable and Wear-Resistant:** The stamped steel cage has high rigidity, precisely guiding roller movement, reducing friction and wear, improving bearing rotation accuracy and reliability, and is suitable for low-speed, heavy-load working conditions.

Installation and Maintenance Points:
**Before installation, clean the bearing, journal, and bearing housing to remove oil, rust, and burrs.** Install the inner ring hot (80-100℃) and the outer ring cold. Use a dedicated installation tool (e.g., Cat 1U-0624). Do not strike the bearing. Ensure the seal fits snugly and the clearance meets CN requirements.

After installation, check for radial runout ≤ 0.02 mm and axial runout ≤ 0.03 mm. Run the bearing for 1 hour; the bearing temperature should be ≤ 80℃, with no abnormal noise or leakage.

Maintenance: Check the clearance and seal every 2000 hours. Replace immediately if the clearance is > 0.04 mm or the seal is damaged. Add grease every 500 hours, filling the bearing cavity to 1/3-1/2 of its volume. Avoid excessive grease to prevent overheating.