CAT 473-4839 Pillow Block Bearing

CAT 473-4839 is an integrated tapered roller bearing assembly designed by Caterpillar for drive/hydraulic systems. It includes an inner ring, outer ring, rollers, and cage, and is suitable for C15 engines, 349D2 excavator slewing gearboxes, 992K loader gearboxes, etc. It can withstand radial and bidirectional axial loads, is suitable for high-speed heavy-duty conditions, and ensures stable operation of the shaft system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 473-4839, Single-row tapered roller bearing assembly (including inner ring, outer ring, rollers, and cage), material is high-carbon chromium bearing steel (GCr15, hardness after quenching HRC60-64, raceway surface ultra-fine ground Ra≤0.08μm), operating temperature -40℃ to +120℃, single weight approximately 4.2 kg, suitable for high-speed (≤3000 rpm), medium-heavy load conditions, withstands radial + bidirectional axial loads, and restricts axial movement of the shaft system.

Key Dimensions
Inner diameter 120 mm (tolerance 0/-0.025 mm), outer diameter 215 mm (tolerance +0.040/0 mm), width 54 mm (tolerance 0/-0.15 mm), number of rollers 18, roller diameter 20 mm, cone angle 13°15′, inner ring fit tolerance K5 (+0.018/+0.002 mm), outer ring fit tolerance J7 (+0.015/-0.010 mm), radial clearance 0.030-0.060 mm, end face runout ≤0.02 mm. Compatible with Cat C15 engines (crankshaft bearings), 349D2 excavators (slewing gearbox input shaft bearings), 992K loaders (gearbox output shaft bearings), and D11T bulldozers (final drive gearbox bearings). Uses 1J-0581 bearing caps and 474-9675 O-rings. Rated loads: Radial rated dynamic load Cr=220 kN, radial rated static load Cor=310 kN, axial rated dynamic load Ca=105 kN, axial rated static load Coa=150 kN, limiting speed (grease lubrication) 2600 rpm, (oil lubrication) 3400 rpm. RPM Installation and Maintenance Points: Before installation, clean the inner and outer rings, journals, and bearing housing bores of the components. Check for cracks, rust, and roller jamming. Measure dimensions and fit tolerances. Apply Cat-specific assembly oil to the bearing housing bores and use cold-press installation to avoid deformation from heat fitting.

Use a special press to apply even pressure during installation. Do not strike the end face or rollers. After installation, adjust the axial clearance to 0.030-0.060 mm. Manually rotate the shaft to ensure there is no jamming or abnormal noise.

Maintenance and Replacement: Check for wear, temperature, and vibration every 1500 hours. If the radial clearance is >0.18 mm or peeling or cracks appear, replace immediately. It is recommended to replace the components simultaneously with the bearing cap and O-ring to ensure support and sealing effectiveness.