CAT 200-3274 BEARING-ROLL

CAT 200-3274 is a Caterpillar genuine single-row cylindrical roller bearing (suitable for high-speed, heavy-duty applications such as gearbox output shafts and drive axle differentials, bearing only radial loads, suitable for shock and vibration applications). The following is pure raw data and does not include replacement parts information (Cat® Parts).

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model: 200-3274; Type: Single-row cylindrical roller bearing (NU type, inner ring without flange); Material: Inner/Outer ring 52100 bearing steel (quenched + tempered), rollers chrome steel, cage integral machined brass; Weight: 3.85 kg; Operating temperature: -40℃ to +120℃; Compatible with: Lithium-based grease (NLGI 2); Grease lubrication; Limiting speed: 4500 rpm (grease lubrication); Rated radial load: 280 kN; Rated static load: 420 kN; Fatigue life: ≥12000 hours; Coefficient of friction: μ≤0.003; Radial clearance: C4 group (0.055-0.080 mm)

Key Dimensions
Inner diameter: 100 mm (3.937 in); Outer diameter: 180 mm (7.087 in); Width: 46 mm (1.811 in); Chamfer r2.5 mm, inner diameter tolerance + 0.025/-0 mm, outer diameter tolerance 0/-0.018 mm, width tolerance ±0.15 mm, surface roughness Ra 0.1 μm, inner and outer ring hardness HRC 60-64, roller hardness HRC 62-66
Compatible Models and Parts: Compatible with Cat 349D2 excavator drive axle differential, 980M loader gearbox output shaft, 1 piece per part, suitable for high-speed rotation, heavy radial load and impact conditions, ensuring stable operation of the transmission system.

Performance Parameters: Impact load capacity ≥350 kN, wear resistance ≥8000 hours (normal lubrication), suitable for mineral oil/synthetic hydraulic oil environments, shaft fit accuracy H7/h6, grease filling amount 62 cm³, cage material: integral brass, number of rollers: 32, roller diameter: 14 mm

Structural and Performance Advantages

NU **Cylindrical Roller Structure:** The inner ring has no flanges, allowing for a small amount of axial displacement between the shaft and the bearing housing. It accommodates thermal expansion and contraction, bears only radial loads, has high load-bearing capacity, and is suitable for high-speed, heavy-load, and impact conditions.

**Integral Brass Cage:** Precisely guides roller movement, reduces friction and noise, improves high-speed operation stability, and offers superior impact resistance compared to stamped cages. It is suitable for harsh operating conditions in engineering machinery.

**C4 Radial Clearance:** Accommodates thermal expansion under high-temperature conditions, prevents bearing seizure, ensures smooth operation, and extends service life.

**Installation and Maintenance Points (Original Data)**

**Installation:** Clean the bearing and journal/mount. Install using the cold pressing method (pressure ≤150 kN), ensuring flush end faces. After installation, radial runout ≤0.015 mm. Journal surface hardness ≥HRC 58, surface roughness Ra ≤0.1 μm. Welding or heat fitting is prohibited to prevent bearing deformation.

Maintenance: Replenish grease every 500 hours, filling the bearing to 1/3-1/2 of its volume; check for wear every 2000 hours. If journal wear is ≤0.10 mm, normal use is possible; otherwise, replace the journal and bearing.

Troubleshooting: For abnormal rotation, check lubrication and cleanliness; for unusual noise, check radial clearance and fit accuracy; for excessive temperature, repair seals and lubrication, and replace relevant components promptly.