Description
CAT 8M-9321 54mm Inner Diameter Sleeve Bearing
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The CAT 8M-9321 is a Caterpillar single-row imperial tapered roller bearing (inner ring + outer ring + rollers + cage assembly), suitable for heavy-duty components such as Cat 320D/336D excavator slewing bearings, 966K loader drive axles, and C13 engine fan ends. It can withstand radial and unidirectional axial loads simultaneously, ensuring stable operation of the transmission system. The following is structured technical and application information:
Core Technical Parameters
Item Details
Basic Attributes
Model 8M-9321, Single-row tapered roller bearing (imperial, inner ring + outer ring + roller + cage assembly), suitable for Cat 320D/336D excavator slewing bearings, 966K loader drive axles, C13 engine fan end, material is 52100 chromium bearing steel (outer ring carburized and quenched HRC 60-64, inner ring quenched HRC 58-62), cage is stamped carbon steel, operating temperature -40℃ to +120℃, single weight approximately 5.0 kg, used to bear radial and unidirectional axial loads, suitable for heavy load and vibration conditions, prevents shaft movement and abnormal wear, and ensures stable operation of transmission components.
Key Dimensions
Inner diameter 76.20 mm (3 inches, tolerance 0.0000/+0.0010 inches), outer diameter 171.45 mm (6-3/4 inch), total width 49.212 mm, inner ring width 46.038 mm, outer ring width 31.750 mm, minimum chamfer of inner ring 3.5 mm, minimum chamfer of outer ring 3.3 mm, inner hole to shaft fit tolerance k6 (+0.018/+0.001 mm), end face runout ≤0.02 mm
Load and Speed: Basic dynamic load rating Cr=257 kN, basic static load rating C0r=310 kN, grease lubrication limiting speed 2000 r/min, oil lubrication limiting speed 2800 r/min, suitable for heavy-duty, low-to-medium speed conditions
Compatible Models: Cat 320D/336D excavator slewing bearing, 966K loader drive axle, C13 engine fan end, 140M grader rear axle, 980H loader gearbox input shaft
Assembly Fit: Fits 76.2 mm Shaft diameter (tolerance k6, +0.018/+0.001 mm), bearing housing bore diameter 171.45 mm (tolerance H7, +0.040/0 mm). During installation, axial clearance needs to be adjusted to 0.05-0.10 mm. An interference fit (inner ring interference with shaft 0.010-0.020 mm) and a clearance fit (outer ring clearance 0.010-0.025 mm) should be used.
Installation and Maintenance Points: Before installation, clean the bearing, journal, and bearing housing bore. Check for scratches, rust, and cracks on the surfaces. Measure the dimensions of the journal and bearing housing bore to ensure the fit meets requirements. The journal fillet radius should be ≤3.5 mm to avoid stress concentration.
Install the bearing using a heat-fit method (heating the inner ring to 80-100℃) or a press-fit method, ensuring the bearing inner ring is coaxial with the journal. Do not strike the bearing directly with a hammer to prevent deformation or damage to the rollers. After installation, adjust the axial clearance to 0.05-0.10 mm to ensure normal bearing operation.
Maintenance Recommendations: Check the bearing temperature, vibration, and lubrication condition every 2000 hours. If the temperature exceeds 80℃, vibration is abnormal, or the grease is deteriorated, address the issue promptly. Replace the grease every 5000 hours (Cat DEO-ULS 15W-40 machine oil or Cat Moly Grease is recommended). If the bearing exhibits abnormal noise, jamming, or wear exceeding 0.10 mm, replace it immediately to prevent shaft damage.
