CAT 1N-8157 BEARING A

CAT 1N-8157 (1N8157) is a Caterpillar original double-row angular contact ball bearing assembly used for high-precision support of rotating components such as engines and transmissions. The following is purely accurate information (no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 1N-8157 Double-row angular contact ball bearing assembly

Part Type: Double-row angular contact ball bearing assembly (paired installation, 30° contact angle, with cage and seal), capable of simultaneously withstanding radial and bidirectional axial loads, suitable for high-speed, high-precision rotating components, suppressing shaft runout, and ensuring transmission accuracy and stability

Material: Inner ring / Outer ring / Balls: GCr15 high-carbon chromium bearing steel (quenching hardness HRC60-64); Cage: Reinforced nylon PA66-GF25 (temperature resistance -40℃ to 120℃, lightweight and wear-resistant); Seal: Nitrile rubber NBR (lip seal, dustproof and leak-proof, suitable for mineral oil lubrication)

Key Dimensions: Inner diameter 35.00 mm (1.3780 in), outer diameter 72.00 mm (2.8346 in), width 34.00 mm (1.3386 in), ball diameter 8.731 mm (0.3437 in), number of balls 18, pitch circle diameter 53.00 mm (2.0866 in), contact angle 30°

Structural Features: Double-row symmetrical arrangement, with non-contact seals, built-in preload, suitable for rigid shaft support requirements, allows for slight angular deviations in the shaft system (≤1.5°), compensates for installation coaxiality errors, and reduces vibration and noise during high-speed operation.

Compatible Structures: Engine camshaft support bearings, gearbox input shaft bearings, hydraulic pump drive shaft bearings, generator main shaft bearings

Applicable Operating Conditions: Suitable for radial loads ≤42.5 kN, axial loads ≤28.3 kN, and speeds ≤8500 rpm. RPM, suitable for high-speed, medium-load, low-impact rotating component support conditions.
Compatible Models and Assemblies:
Engine: CAT 3304, 3306, C7.1 (camshaft bearing assembly, balance shaft bearing assembly)
Excavator: CAT 312D2, 313D2 (hydraulic pump drive shaft bearing assembly, swing motor output shaft bearing assembly)
Loader: CAT 938M, 950M (transmission input shaft bearing assembly, drive shaft support bearing assembly)
Compatible Assemblies: 3306 camshaft bearing assembly, 312D2 hydraulic pump drive shaft bearing assembly, 938M transmission input shaft bearing assembly
Installation and Fitting Points: Inner ring with shaft interference fit (interference 0.005-0.015 mm), outer ring with bearing housing transition fit (clearance 0-0.012 mm). Cold press installation using a special mounting sleeve. Do not directly strike the bearing end face to prevent damage to the seal ring, steel balls, and raceways.

Before installation, clean the journal, bearing housing bore, and bearing, ensuring there are no burrs, oil stains, or rust. Inspect the bearing for cracks and deformation, ensuring smooth rotation without jamming or abnormal noise. The seals should be intact and undamaged.

After installation, the bearing end face should align with the locating step, with radial runout ≤0.02 mm and axial movement ≤0.05 mm. Operation should be smooth without abnormal vibration or noise, and lubrication should be adequate without overheating.

During disassembly, use a dedicated puller to evenly pull out the inner ring. Do not pry forcefully to avoid damaging the shaft and bearing housing. Before reuse, inspect the raceway, steel balls, and seals; replace if they do not meet requirements.