CAT 446-6041 BEARING

CAT 446-6041 is a Caterpillar genuine single-row tapered roller bearing (with cage), suitable for Cat 320D2/323D2 excavator slewing bearings, 966M loader gearbox axle, etc., used to withstand combined radial and unidirectional axial loads, ensuring stable operation under heavy load conditions. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 446-6041, Type Single-row Tapered Roller Bearing (outer ring separable), Suitable for Cat construction machinery transmission and slewing mechanisms, Material High Carbon Chromium Bearing Steel (GCr15SiMn), Inner Diameter φ65 mm, Outer Diameter φ120 mm, Width 34 mm, Taper Angle 12°30′, Single Weight Approx. 1.8 kg, Rated Dynamic Load 102 kN, Rated Static Load 128 kN, Limiting Speed ​​3200 r/min (grease lubrication)/4500 r/min (oil lubrication), operating temperature -30℃ to +150℃, lubricant compatible with NLGI 2 lithium-based grease (with EP additive)

Key Dimensions: Inner diameter tolerance 0/-0.015 mm, outer diameter tolerance 0/-0.020 mm, width tolerance ±0.15 mm, inner ring raceway cone angle tolerance ±15′, roller cone angle tolerance ±10′, inner ring reference end face runout ≤0.015 mm, outer ring end face runout ≤0.020 mm, surface roughness inner ring raceway Ra≤0.4 μm, outer ring raceway Ra≤0.6 μm

Material and Manufacturing Process: Inner ring/outer ring/roller are made of GCr15SiMn (quenched HRC 60-64), cage is made of stamped steel plate (SPCD, galvanized surface), using an integrated design of stamped cage + roller assembly, rollers are convex modified to reduce contact stress. 15%, heat treatment is integral quenching + tempering + ultra-precision grinding, residual austenite content ≤5%, free from defects such as decarburization and cracks, cleanliness reaches NAS 8 level.

Compatible models: Cat 320D2/323D2/326D2 excavator slewing bearing planetary gear shaft, 966M/972M loader brake input shaft, D6K/D7E bulldozer final drive output shaft, compatible shaft diameter φ65 mm, commonly used with 446-6042 bearing housing rings and 446-6043 sealing rings.

Assembly fit: Inner ring interference fit with shaft (0.010-0.020 mm), outer ring clearance fit with bearing housing (0.005-0.015 mm), bearing clearance after installation 0.025-0.040 mm. For bearings installed in pairs, use a face-to-face (DF) or back-to-back (DB) arrangement to ensure axial positioning accuracy.

Installation and Maintenance Points:

Before installation, clean the bearing, journal, and bearing housing, checking for rust, deformation, or raceway peeling. Install the inner ring using the hot-fit method (heat the inner ring to 80-100℃ and hold for 10-15 minutes). The outer ring should be cold-pressed in; do not force it in.

After installation, check that the bearing rotates freely without jamming. Run it under no-load for 30 minutes, monitoring the temperature to ≤85℃. Check every 1500 hours. Replace immediately if pitting, peeling, or clearance >0.10 mm is observed on the rollers or raceways.

The initial grease filling should be 1/3-1/2 of the bearing cavity. Replenish every 1000 hours, but shorten this to 500 hours in dusty/humid conditions. Avoid mixing different types of grease.