CAT 077-6379 BEARING

CAT 077-6379 is a Caterpillar genuine single-row tapered roller bearing, suitable for the drive axle wheel ends/differentials of wheel loaders, excavators, and other equipment. It can withstand both radial and unidirectional axial heavy loads simultaneously. The following is pure raw data and does not include replacement parts information for Cat®…

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 077-6379, Type: Single-row tapered roller bearing, Material: High-carbon chromium bearing steel (GCr15), Weight: 2.1 kg, Operating Temperature: -30℃ to +120℃, Fitting Shaft Diameter: 65 mm, Rated Radial Load: 42 kN, Rated Axial Load: 20 kN, Limiting Speed: 2800 rpm, Lubrication Method: Grease/Oil Lubrication Compatible

Key Dimensions (Metric/Imperial): Inner Diameter: 65 mm (2.56 in), Outer Diameter: 120 mm (4.72 in), Width: 29 mm (1.14 in), Number of Rollers: 20, Roller Taper Angle: 14°, Inner and Outer Ring Fit Tolerance: P6, Radial Clearance: C3

Performance Parameters Inner and Outer Ring Hardness: HRC 60-64, Roller Hardness: HRC 62-66, Surface Roughness: Ra≤0.04 μm diameter, cage material: stamped steel plate, sealed structure, non-contact dust cover, compatible with system working pressure ≤20 MPa.

Structure and Compatibility Characteristics:
Heavy-duty compatibility: Tapered roller structure adapts to complex load conditions of drive axle wheel ends/differentials, dispersing shaft stress, improving operational stability, and withstanding impact loads during equipment travel and operation.

Precision assembly: Factory pre-adjusted clearance and tolerances, adaptable to specific machine models without additional adjustments, suitable for dusty and vibrating conditions, ensuring assembly accuracy and operational reliability.

Wear-resistant and contamination-resistant: High-carbon chromium bearing steel quenching treatment, high surface hardness and wear resistance, high-strength stamped steel plate cage, dust cover design reduces contaminant intrusion and extends bearing life.

Compatible Machine Models and Application Scenarios:
Loaders: 938K, 950K, 966K, etc.

Excavators: 312GC, 313D2, 320D2, etc.

Application Scenarios: Drive axle wheel end support, differential output shaft support, ensuring efficient power transmission of the travel system and adapting to the heavy-duty operation requirements of medium and large-sized construction machinery.

Installation and Maintenance Points (Original Data)

Installation: Clean the shaft diameter and bearing housing bore, ensuring no scratches or rust on the surface. Shaft diameter tolerance k6, bearing housing bore tolerance H7.

Use the hot-fit method (oil temperature 80-100℃). Do not strike. After installation, check end face runout ≤0.05 mm.

After installation, add NLGI 2 lithium-based grease and run under no-load for 5-10 minutes to ensure no jamming or abnormal noise.

Maintenance: Check the bearing’s operating condition every 1800 hours. Replace immediately if the temperature rise exceeds 40℃ or abnormal noise occurs.

Check the grease condition every 500 hours. Clean the grease filler nozzle when replenishing to prevent contaminants from entering.