CAT 581-8945 BEARING-CUP-GD

CAT 581-8945 YM is a Caterpillar genuine single-row tapered roller bearing outer ring (Cup), suitable for drivetrain/drive axle tapered roller bearing assemblies. The following is purely precise information (no additional description) for Cat®…:

Core Parameters and Information

Item Details
Part Model: CAT 581-8945 YM (5818945) Tapered Roller Bearing Outer Ring (Cup-shaped Outer Ring)

Part Type: Single-row tapered roller bearing outer ring, suitable for pairing with corresponding inner rings (Cone) to form a complete bearing, capable of withstanding radial + unidirectional axial loads

Material: High carbon chromium bearing steel GCr15, carburized and quenched, hardness HRC60-64, raceway surface ground Ra≤0.4μm

Key Dimensions: Inner diameter 178.52mm (cup-shaped tapered surface), outer diameter 254.00mm (r6 tolerance), width 46.04mm, cone angle 10°30′, raceway curvature radius 8.5mm

Structural Features: Outer ring with retaining groove, no cage (fits with inner ring assembly), contact angle 15°, rated dynamic load 280kN, rated static load 380kN

Matching: Bearing housing bore fit tolerance H7, interference fit 0.010-0.020mm, operating temperature -40℃ to +120℃

Lubrication Requirements: Oil lubrication (CAT DEO-ULS 15W-40), lubrication pressure 0.20-0.30MPa, flow rate ≥0.8L/min

Compatible Machines and Assemblies:

Loaders: CAT 950M, 962M, 972M (front drive axle differential assembly)

Excavators: CAT 330GC, 336GC (travel motor reduction gearbox output shaft bearing)

Compatible Assemblies: Drive axle differential housing, gearbox output bearing housing, steering knuckle kingpin bearing housing

Matching Parts: 581-8945 Outer ring, corresponding inner ring (e.g., 581-8946), roller assembly, 8T-4125 elastic retaining ring, adjusting shims (0.10-0.30mm)

Installation and Fitting Points:
Clean the seat bore and outer ring surface, ensuring no burrs or oil stains. The seat bore roughness Ra≤1.6μm, and the outer ring raceway should be free of scratches.

Cold press installation, pressure ≤40kN. Use guide fixtures to ensure coaxiality. Do not directly strike the outer ring end face.

Interference fit with the seat bore: 0.010-0.020mm. Rear end face runout ≤0.03mm, radial runout ≤0.02mm.

After assembling with the inner ring assembly, adjust the axial clearance to 0.025-0.045mm, preload torque 20-25N・m, ensuring smooth rotation without jamming.