CAT 418-6277 BEARING

CAT 418-6277 is a Caterpillar original single-row tapered roller bearing, commonly used in gearboxes, differentials, or wheel hubs of excavators, loaders, and other equipment. It is suitable for medium and heavy-duty working conditions, can withstand radial and unidirectional axial loads, ensures stable operation of transmission components, and is a key wear part of the transmission system. The following are the core information and key points:

Core Technical Parameters
Item Details
Part Model: CAT 418-6277 (4186277) Single Row Tapered Roller Bearing, Original Equipment Manufacturer (OEM), includes inner and outer rings and roller assembly, no universal replacement model
Material: Chromium-molybdenum alloy steel (SAE 52100), Inner and outer ring/roller hardness HRC 60-64, cage is stamped steel plate, corrosion resistance rating ≥72 hours neutral salt spray test
Key Dimensions: Inner diameter 80mm, outer diameter 140mm, width 42mm, chamfer r=2.5mm, radial clearance 0.012-0.022mm, cone angle 10°, compatible shaft diameter tolerance js6, bearing housing tolerance H7
Compatible Models: CAT 320D/323D excavator, 966H/972H loader, D6R Used in bulldozers and other applications, for transmission components such as gearbox output shafts, differential half-shafts, and wheel hubs.

Performance Parameters: Dynamic rated load 150kN, static rated load 180kN, limiting speed 2200r/min (grease lubrication)/2800r/min (oil lubrication), operating temperature -40℃ to 120℃

Core Functions and Structure:

Combined Load Bearing: The tapered roller design can simultaneously withstand radial and unidirectional axial loads, suitable for frequent start-stop and variable load operations in construction machinery, avoiding overload damage.

Precise Positioning: The inner and outer ring tapered surfaces ensure precise contact between the rollers and raceways, reducing vibration and noise, maintaining rotational accuracy, and extending the life of gears, shafts, and other components.

High-Efficiency Heat Dissipation: Suitable for grease or oil lubrication, rapid heat dissipation through the lubricating medium prevents overheating and meets the needs of continuous heavy-duty operations.

Easy Assembly: The separate inner and outer ring design facilitates installation and disassembly, adapting to on-site maintenance and reducing maintenance difficulty.

Installation and Maintenance Points

Installation Specifications: Clean the journal and bearing housing bore to remove oil and rust. Journal roughness Ra≤0.8μm, roundness≤0.01mm; use heat mounting (heat bearing to 80-100℃). Do not directly strike the inner or outer rings.

During installation, adjust the axial clearance to 0.02-0.04mm. Ensure the bearing end face fits tightly against the shaft shoulder. Tighten the bearing housing bolts to the torque specified in the equipment manual (typically 70-90 N·m).

Maintenance Recommendations: Every 1000 working hours, check: bearing temperature (≤80℃), vibration level (≤4mm/s), and grease condition. Replenish or replace grease promptly if abnormal. Replace grease every 2000 working hours (for grease lubrication).

Only use genuine 418-6277 bearings. Do not substitute with ordinary tapered roller bearings to avoid insufficient load capacity, improper clearance leading to premature failure and transmission component malfunctions.