CAT 298-8193 BEARING

CAT 298-8193 is a Caterpillar genuine single-row tapered roller bearing (complete assembly, including inner ring/rollers/cage/outer ring), suitable for heavy-duty components such as the swing motor of Cat 320D2/323D2 excavators and the hydraulic cylinder articulation of the bucket cylinder of 966M loaders. It is used to withstand radial + unidirectional axial combined loads. The following is the professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 298-8193, Type Single-row Tapered Roller Bearing (Complete Assembly), Material 52100 High Carbon Chromium Bearing Steel (Vacuum Degassed), Inner Diameter φ65 mm (2.559 in), Outer Diameter φ120 mm (4.724 in), Width 35 mm (1.378 in), Single Weight Approx. 2.8 kg, Rated Dynamic Load 125 kN, Rated Static Load 150 kN, Contact Angle 15°, Compatible with NLGI 2. Lithium-based grease (with EP additive), IP65 corrosion resistance, with stamped steel cage (16 rollers per row)

Key Dimensions: Inner diameter tolerance +0.010/-0.008 mm, outer diameter tolerance +0.025/-0.015 mm, width tolerance ±0.12 mm, inner hole surface roughness Ra≤0.8 μm, outer diameter Ra≤1.6 μm, end face runout ≤0.05 mm, coaxiality ≤0.03 mm, roller diameter φ12 mm, roller length 22 mm

Material and Process: 52100 bearing steel forging → precision machining → integral quenching (HRC 60-64) → ultra-precision grinding, tensile strength ≥1800 MPa, yield strength ≥1500 MPa, hardened layer depth 1.8-2.2 mm, inner ring interference fit with shaft (0.015-0.025 mm) The outer ring has a clearance fit with the mounting seat (0.02-0.03 mm).

Compatible Models: Cat 320D2/323D2 excavator swing motor output shaft bearing, 966M/972M loader boom lifting cylinder lower articulation bearing, D6K/D7E bulldozer steering clutch bearing. Suitable for heavy-duty transmission/articulation parts with a shaft diameter of φ65 mm. Often used with 298-8194 bearing housing.

Assembly Fit: Interference fit with the shaft (0.015-0.025 mm). After installation, the bearing and journal locating surface should be in contact (deviation ≤0.1 mm). It is recommended to use a bearing heater (80-100℃) for heat fitting. Cold installation and forceful hammering are strictly prohibited. Working clearance: 0.08-0.12 mm.

Installation and Maintenance Points: Before installation, clean the bearing, journal, and mounting seat. Check for cracks, raceway pitting, or roller damage. Heat the inner ring with an 80-100℃ heater. After 15-20 minutes, heat-fit the bearing to the journal and use a dial indicator to check the coaxiality to ≤0.03 mm.

After installation, test for smooth, unrestricted rotation. Perform a 30-minute no-load test run, monitoring the temperature to ≤80℃. Check every 1500 hours. Replace immediately if raceway wear >0.15 mm, or if peeling or abnormal noise occurs.

The initial grease filling should be 1/3 of the bearing volume. Replenish every 1000 hours. In dusty/humid conditions, shorten the interval to 500 hours. Avoid mixing different types of grease.