Description
CAT 9S-9302 31.75mm Inner Diameter Needle Roller Bearing
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The CAT 9S-9302 is a Caterpillar genuine single-row tapered roller bearing, suitable for critical components such as engines and transmissions. It is used to withstand combined radial and unidirectional axial loads, and is suitable for medium-to-high speed and vibration conditions, ensuring stable and reliable power transmission. The following are key information.
Core Technical Parameters
Item Details
Part Model: CAT 9S-9302 (Single Row Tapered Roller Bearing, Single Piece)
Material: High Carbon Chromium Bearing Steel (GCr15), Quenched Hardness: HRC60-64, Raceway Ultra-precision Grinding, Surface Rust-proofing Treatment, Fatigue Life ≥8000 Working Hours
Key Dimensions: Inner Diameter Approx. 45mm, Outer Diameter Approx. 100mm, Width Approx. 30mm, Raceway Taper Angle Approx. 12°, Inner Ring Interference Fit with Shaft (0.01-0.03mm)
Single Weight: Approx. 1.8kg (4.0 lbs)
Compatible Models: CAT 320D/323D Excavators, 950GC Loaders, C13 Engines, etc., gearbox shafts, differentials, water pump shafts, or fan drive shafts
Performance Characteristics: Rated Radial Dynamic Load ≥95kN, Rated Axial Dynamic Load ≥45kN, Allowable Speed ≤3000rpm, Operating Temperature – 40℃ to +120℃, raceway surface roughness Ra≤0.08μm, resistant to vibration and alternating loads.
Structure and Core Functions
Complex Load Bearing: The tapered raceway makes line contact with the rollers, efficiently transmitting radial and unidirectional axial loads, suitable for heavy-duty composite forces. The cage precisely positions the rollers, avoiding skewed friction and reducing transmission losses.
Shaft Diameter Matching and Positioning: The inner ring has an interference fit with the shaft, ensuring no radial movement during operation, guaranteeing the coaxiality of transmission components, and preventing abnormal noise and wear.
Optimized Operating Conditions: Suitable for medium- and high-speed, vibration conditions. The raceway undergoes ultra-precision grinding to improve lubrication, reduce frictional heat generation, and extend service life.
Suitable Scenarios and Installation & Maintenance Points
Suitable Scenarios: Used in the gearbox, differential, water pump shaft, or fan drive shaft of excavators, loaders, and other equipment, suitable for medium- and high-speed, vibration, and impact conditions.
Installation Specifications: Clean the journal and bearing housing bore, ensuring they are free of burrs, oil, and rust. Install hot (heat the inner ring to 80-90℃) or press in cold; do not forcefully hammer, as this may damage the raceway.
After assembly, check the axial clearance (0.05-0.15mm). Adjust according to the manual. Add CAT 5K-8591 grease, filling the bearing cavity to 1/3-1/2 full.
Maintenance Recommendations: Check the bearing temperature (≤80℃) and noise every 600 operating hours. If abnormal, disassemble and inspect for raceway wear, spalling, or cage damage; replace promptly.
Replenish/replace grease every 1500 operating hours. Regularly check the seals to prevent leaks and contaminant entry.
