CAT 389-5179 BEARING

CAT 389-5179 is a Caterpillar genuine single-row tapered roller bearing assembly (including inner ring, outer ring, rollers, and cage). It is suitable for differentials, final drives, or gearboxes in heavy-duty equipment, and can withstand combined radial and unidirectional axial loads. It is suitable for high-frequency vibration and shock conditions in mining, infrastructure, and other applications, ensuring smooth operation of the transmission system. The following are key information.

Core Technical Parameters

Item Details
Part Model: CAT 389-5179 (Tap Roller Bearing Assembly)

Material: High carbon chromium bearing steel (GCr15), quenching hardness HRC60-64, raceway ultra-precision ground, surface rust-proof treatment, fatigue life ≥12000 working hours

Key Dimensions: Inner diameter approx. 100mm, outer diameter approx. 150mm, width approx. 35mm, tapered raceway half-cone angle approx. 12°, outer ring interference fit with bearing housing (0.015-0.04mm)

Single Weight: Approx. 2.8kg (6.2 lbs)

Suitable Machines: Differential main reducer, final drive planetary gear shaft, and gearbox second shaft support parts of CAT 980K/L loaders, 770G mining trucks, D9T bulldozers, etc.

Performance Characteristics Rated radial dynamic load ≥120kN, rated axial dynamic load ≥55kN, allowable speed ≤2500rpm, operating temperature -40℃ to +120℃, resistant to vibration and alternating loads, low coefficient of friction.

Structure and Core Functions

Bidirectional Load Bearing: The tapered rollers and inner and outer raceways are in line contact, efficiently transmitting radial and unidirectional axial loads, adapting to the combined force requirements under heavy-duty conditions, and preventing component movement and abnormal wear.

High-Precision Guiding: The cage is made of stamped steel plate, accurately positioning the roller spacing, avoiding roller misalignment and friction. The raceway surface roughness Ra≤0.08μm reduces rolling friction loss and improves transmission efficiency.

Convenient Installation and Positioning: The inner and outer rings are separable for easy assembly and maintenance. The outer ring has an interference fit with the bearing housing to ensure stable operation, while the inner ring has a transition fit (0-0.02mm) with the shaft to ensure coaxiality.

Suitable for harsh working conditions: The optimized sealing structure (compatible with corresponding oil seals) prevents dust and mud intrusion, making it suitable for complex operating environments such as high temperatures and dusty conditions, extending bearing life.

Suitable Scenarios and Installation & Maintenance Points

Suitable Scenarios: Used in core transmission components such as differentials, final drives, and gearboxes in large loaders, mining trucks, bulldozers, etc., suitable for heavy-load, high-frequency vibration, and impact conditions, ensuring reliable power transmission.

Installation Specifications: Clean the journals and bearing housing bores, ensuring they are free of burrs, oil, and rust; use cold press-fit or heat fitting (heat the bearing to 80-90℃), and avoid forceful hammering that could damage the raceways.

After assembly, check the axial clearance (0.05-0.15mm), adjust according to the equipment manual, and add specified grease such as CAT 5K-8591, filling the bearing cavity to 1/3-1/2 full. Maintenance Recommendations:

Check bearing temperature (≤80℃) and noise every 800 working hours. If abnormal, disassemble and inspect for raceway wear, spalling, or cage damage, and replace promptly.

Regularly inspect seals to prevent grease leakage and contaminant ingress. Replenish or replace grease every 2000 working hours. Take rust-prevention measures when storing for extended periods.