CAT 482-6754 125mm Outer Diameter Roller Bearing

CAT 482-6754 is a Caterpillar original single-row cylindrical roller bearing (NJ type, with a single flange on the inner ring, capable of withstanding unidirectional axial loads). It is compatible with the Cat 793D mining truck gearbox axle, D11T bulldozer drive axle differential, and 992K loader gearbox planetary carrier output shaft, used for radial support in heavy-duty drivetrain systems. The following is a professional technical and application guide:

Core Technical Parameters (Professional Version)

Item Details Basic Attributes Model 482-6754, Type Single-row cylindrical roller bearing (NJ type, single flange on the inner ring, stamped steel cage + single-row cylindrical rollers), compatible with Cat 793D mining truck gearbox axle, D11T bulldozer drive axle differential, 992K loader gearbox planetary carrier output shaft, 785D mining truck balance shaft bearing housing, material is inner ring/outer ring/roller (SAE 52100) Bearing steel, quenched hardness HRC 62-66; cage (SAE 1010 steel sheet stamping, galvanized and passivated surface); inner diameter 100.0 mm (tolerance JS6, +0.022/-0.022 mm); outer diameter 150.0 mm (tolerance h7, 0/-0.035 mm); width 35.0 mm (tolerance ±0.20 mm); unit weight approximately 2.8 kg; rated radial load Cr≥190 kN; rated static load Cor≥210 kN; operating temperature -40℃ to +120℃; lubrication method: grease lubrication (NLGI 2 lithium-based grease) / oil lubrication (ISO VG 68 anti-wear hydraulic oil); limiting speed (grease lubrication) ≤2800 rpm, (oil lubrication) ≤3600 rpm; axial load capacity ≤30 kN (unidirectional).

Key dimension: Roller diameter 10.0 mm (tolerance…) ±0.02 mm), 28 rollers, cage window clearance 0.3-0.5 mm, inner ring flange height 5.0 mm (tolerance ±0.10 mm), radial clearance C3 group (0.045-0.075 mm), interference fit with shaft (interference 0.010-0.025 mm), clearance fit with housing bore (clearance 0.020-0.040 mm)

Material and Manufacturing Process: Inner/outer rings are vacuum quenched + low-temperature tempered, surface ultra-precision ground (Ra≤0.2 μm), rollers adopt a convexity design (logarithmic curve) to reduce edge stress, cage is an integral stamped and riveted structure, no risk of loosening or deformation, contact fatigue life ≥6000 hours (under rated load), impact load resistance ≥40 kN, repeat assembly accuracy ≤0.10 mm

Compatible Models: Cat 793D/785D mining truck gearbox second shaft / Three-axis drive axle differential for D11T/D10T bulldozers, planetary carrier output shaft for 992K/988H loader gearboxes, and vertical shaft for 789D mining truck steering knuckles. The core components are used for radial support in the transmission systems of heavy-duty equipment, suitable for radial loads ≥160 kN and speeds ≤2500 rpm, replacing traditional ball bearings to improve radial load capacity.

Assembly fit: Interference fit with shaft (interference 0.010-0.025 mm, heat fitting temperature 80-100℃), clearance fit with housing bore (clearance 0.020-0.040 mm). Axial positioning after installation uses a shaft shoulder and lock nut. Radial runout ≤0.08 mm, axial movement ≤0.10 mm. When used with matching bearings 482-6755, coaxiality error ≤0.05 mm. Installation and Maintenance Points (mm) Before installation, clean the bearing, journal, and housing bore. Check that the bearing is free of rust and the cage is free of deformation. Ensure the journal and housing bore surfaces are free of scratches and burrs. Measure the shaft diameter/bore diameter and roundness to ensure they meet tolerances (journal roundness ≤ 0.02 mm, housing bore roundness ≤ 0.03 mm).

During assembly, use the hot-fitting method (heat the bearing to 80-100℃). Smoothly install the shaft assembly, guiding it into the housing bore with a special tooling to ensure uniform contact between the rollers and the inner and outer raceways without jamming. After installation, use the lock nut to axially lock and prevent axial movement. Allow the bearing to cool naturally to room temperature before loading.

Maintenance Recommendations: Check the lubrication condition and bearing wear every 800 hours. If pitting, peeling, or wear on the inner/outer raceway > 0.10 mm appears on the roller surface, immediately replace the bearing and repair the journal/housing bore to prevent decreased transmission accuracy or bearing seizure.