CAT 299-0248 BEARING

CAT 299-0248 is a Caterpillar single-row tapered roller bearing (including inner and outer rings/roller assemblies) for drive systems. It is suitable for drive axles and gearboxes of equipment such as loaders and excavators. It can withstand heavy radial and unidirectional axial loads, is suitable for shock and vibration conditions, and ensures precise positioning and stable operation of transmission components. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 299-0248, Type: Single-row tapered roller bearing (including tapered sleeve), Material: Chromium steel (52100), Surface carburized and quenched (HRC60-64), Single weight: Approximately 4.8 kg, Applicable temperature: -40℃ to +120℃, Corrosion resistance rating: IP54, Rated speed: 1800 r/min (grease lubrication), Recommended lubricant: Cat DEO-ULS 15W-40, Sealing type: Non-contact dust cover (nitrile rubber + steel plate)

Key Dimensions
Inner diameter: 100 mm (shaft diameter tolerance h7), Outer diameter: 215 mm (bearing housing tolerance H8), Width: 45 mm (tolerance ±0.10 mm), Roller size: 16 mm × 38 mm (24, evenly distributed in a single row), Cage material: Stamped steel plate, Contact angle: 15°, Clearance rating: CN (radial clearance) 0.015-0.030 mm), chamfer 2 mm, installation interference 0.012-0.022 mm
Compatible Models and Applications: Compatible with Cat 323D2 and 330D2 excavators, 966M and 972M loaders, for final drive reduction gearbox, drive axle differential, and gearbox input shaft. Supporting parts include bearing cap 222-4616, fixing bolt 9R-2498, and adjusting shim 7Y-0597. Rated radial load ≥320 kN, axial load ≥180 kN. Suitable for stable transmission under heavy load and impact conditions.
Performance Parameters: Rated dynamic load C≥380 kN, rated static load C0≥450 kN, fatigue life ≥9000 hours, limiting speed 2200 r/min (oil lubrication), coefficient of friction ≤0.003, allowable angular deviation ≤1.5°, dust cover protection level. IP54 waterproof and dustproof, suitable for dusty environments.
Structural and Performance Advantages:
**Bidirectional Load Bearing:** Tapered roller structure can simultaneously withstand heavy radial loads and unidirectional axial loads, suitable for drive axles, gearboxes, and other components requiring axial positioning, preventing component movement.
**Precise Positioning:** The inner and outer rings have a tapered surface fit. Preload can be controlled by adjusting shims during installation, ensuring coaxiality of transmission components, reducing vibration and noise, and improving transmission efficiency.
**Heavy-Duty Adaptability:** The high rigidity of the stamped steel cage precisely guides roller movement, suitable for impact and vibration conditions, extending bearing life.
**Reliable Protection:** Non-contact dust cover design effectively prevents dust and moisture intrusion, reduces grease leakage, and lowers maintenance frequency.

Installation and Maintenance Points:
**Before installation, clean the shaft diameter, bearing housing, and bearing to remove oil, rust, and burrs. For the inner ring, heat-fit (80-100℃); for the outer ring, heat-fit (cold-fit). Use specialized installation tools and avoid hammering. Ensure the dust cover fits snugly. Control the preload force to 50-80 N·m, and ensure the clearance meets CN requirements.

After installation, check for radial runout ≤0.02 mm and axial movement ≤0.03 mm. Perform a 1-hour trial run; 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 dust cover is damaged. Add grease every 500 hours, filling the bearing cavity to 1/3-1/2 full to avoid excessive grease leading to overheating.