CAT 189-4718 BEARING

CAT 189-4718 is a Caterpillar genuine single-row cylindrical roller bearing (suitable for transmission components such as gearboxes, differentials, and transfer cases, capable of withstanding heavy radial loads and operating at low to medium speeds, ensuring smooth power transmission). The following is the original data and does not include information on replacement parts.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model: 189-4718, Type: Single-row cylindrical roller bearing (inner ring + outer ring + rollers + cage assembly), Material: High carbon chromium bearing steel (GCr15SiMn), Weight: 1.26 kg, Operating Temperature: -40℃ to +120℃, Suitable for: Extreme pressure lithium-based grease (NLGI 2), Rated dynamic load: ≥152 kN, Rated static load: ≥185 kN, Limiting speed (grease lubrication): ≥3600 rpm, Coefficient of friction: μ≤0.005, Suitable for: Mineral oil/synthetic gear oil environments, Fatigue life: ≥9000 hours

Key Dimensions
Inner diameter: 60 mm (2.362 in), Outer diameter: 110 mm (4.331 in), Width: 28 mm (1.102 in), Number of rollers: 18, Roller diameter: 10 mm, Roller length: 22 mm, Inner ring large end diameter: 72 mm diameter, outer ring small end diameter 98 mm, chamfer r2.0 mm, inner diameter tolerance 0/-0.015 mm, outer diameter tolerance 0/-0.020 mm, width tolerance ±0.15 mm, surface roughness Ra 0.2 μm, hardness HRC 60-64, hardened layer depth 0.6-0.9 mm. Compatible Models and Parts: Compatible with Cat 320D2 and 323D2 excavator swing mechanisms (1 piece per part), 950M loader gearbox secondary shaft (2 pieces per part). Used to bear heavy radial loads, suitable for medium-low speed and high load transmission conditions, ensuring stable operation of components.

Performance Parameters: Impact load capacity ≥160 kN, wear resistance ≥8500 hours (normal lubrication), shaft fit accuracy k5, seat fit accuracy H7, grease filling amount 12 cm³, radial clearance C3 (0.025-0.045). (mm)
Structural and Performance Advantages
Single-row cylindrical roller structure: Specifically designed for heavy radial load conditions. Rollers make line contact with the raceway, resulting in uniform load distribution and strong load-bearing capacity, suitable for the high load requirements of transmission components such as gearboxes and differentials.

GCr15SiMn material: Quenched and tempered, balancing hardness and toughness, exhibiting excellent fatigue resistance and wear resistance, suitable for the impact and vibration environments of complex engineering machinery.

C3 radial clearance design: Suitable for medium-low speed, high load conditions, compensating for installation errors and thermal expansion, preventing jamming during operation, reducing friction loss, and extending bearing life.

Installation and Maintenance Points (Original Data)

Installation: Clean the bearing and shaft/bearing housing. Install using hot mounting (oil temperature ≤100℃) or cold pressing method, pressure ≤80 kN, ensuring flush end faces. After installation, radial runout ≤0.03 mm, shaft surface roughness Ra ≤0.2 μm. Welding or high-temperature heating is prohibited to prevent bearing deformation and material performance degradation.

Maintenance: Replenish grease every 500 hours, filling the bearing to 1/3-1/2 of its volume; check for wear every 2000 hours. If roller end face wear is ≤0.2 mm, normal use is possible; replace the bearing if wear exceeds this limit.

Troubleshooting: For abnormal operating noise, check radial clearance and lubrication; for abnormal temperature, check installation accuracy and load; for abnormal wear, inspect seals and cleanliness, and replace relevant components promptly.