Description
CAT 449-5085 Tapered Roller Bearing
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CAT 449-5085 is a Caterpillar single-row tapered roller bearing, suitable for drive axles, gearboxes, and other assemblies in small loaders and excavators. It can withstand heavy radial and unidirectional axial loads simultaneously. The following is structured and precise information.
Core Parameters (Professional Version)
Project Details
Basic Attributes Model 449-5085, Single-row tapered roller bearing (including inner ring, outer ring, rollers, and cage), used in drive axle differentials, gearbox output shafts, and wheel hub shaft systems. Quantity per unit: 1–2 pieces (depending on shaft end positioning requirements).
Key Dimensions Inner diameter 50.8 mm (2 in), outer diameter 100 mm, width 30.16 mm (1.1875 in), taper angle 15°, tolerance grade ISO IT6, suitable shaft diameter 50.8 mm, mounting hole diameter 100 mm (H7 tolerance).
Material and Processing High-carbon chromium bearing steel (SAE 52100), integral quenching + tempering, raceway ultra-precision grinding, hardness 60–64 HRC, cage is stamped steel plate/nylon, roller surface convex design to reduce edge stress.
Performance Parameters Radial rated dynamic load Cr≈65 Rated axial dynamic load Ca≈32 kN, rated static load C0r≈78 kN, suitable speed ≤4000 rpm, operating temperature -40℃ to +120℃. Compatible models: Cat 906/907/908 mini loaders, 301.7/302.7 mini excavators, 420/430 mini excavators, some drive axle assemblies (e.g., 4W-0001), gearbox output shaft. Installation and maintenance points: Clean the bearings and mounting seats before installation, ensuring no burrs or rust. Journal surface roughness Ra≤0.8 μm, mounting seat roundness≤0.01 mm.
Use hot fitting (inner ring heated to 80–100℃) or cold pressing. Use specialized tooling to distribute force evenly, avoiding impact damage to the raceways and rollers.
After assembly, adjust the axial clearance (0.03–0.06 mm) according to the machine model’s maintenance manual to prevent bearing seizure or accelerated wear. It is recommended to check the bearing temperature (≤80℃) and vibration every 2000 hours. If abnormalities are found, disassemble and inspect the bearing and replace any worn parts.
