CAT 283-1257 BEARING

CAT 283-1257 is a Caterpillar single-row tapered roller bearing (inner ring + roller assembly), suitable for gearboxes/differentials of loaders, excavators, and other equipment. It can withstand heavy radial and unidirectional axial loads, ensuring stable operation of the transmission system. It has strong adaptability and durability. Cat® … The following are the core information and key points:

Core Technical Parameters
Item Details
Part Model CAT 283-1257 (2831257) Single Row Tapered Roller Bearing (Inner Ring + Roller Assembly), used for gearbox shaft 2, differential pinion shaft, suitable for small and medium-sized engineering machinery transmission systems Cat®…

Material Inner ring/roller is chromium bearing steel (GCr15SiMn), quenched + tempered (HRC60-64), cage is stamped steel plate, impact resistant, fatigue resistant, suitable for heavy-duty working conditions

Key Dimensions Inner diameter 47mm, outer diameter 80mm, width 22mm, cone angle 10°, clearance class C3, suitable shaft diameter 47.01-47.03mm, mounting hole diameter 80H7, installation tolerance ±0.02mm

Compatible Models CAT 906M/907M loaders, 307/308 Excavator, C3.3/C4.4 engine, used for gearbox shaft 2, differential pinion shaft, transfer case input shaft, matching outer ring 283-1258, suitable speed ≤2800rpm.

Performance Parameters: Radial rated load 42kN, axial rated load 18kN, limiting speed (grease lubrication) 3200rpm, operating temperature -40℃ to 120℃, interference fit 0.012-0.022mm.

Core Functions and Structural Features:

Combined Load Bearing: Tapered roller structure adapts to radial + unidirectional axial combined loads of gearbox/differential, withstands medium to high impact vibration, ensures smooth rotation of transmission components, and reduces energy consumption and wear.

High Precision Fit: Raceways are ultra-precision ground, dimensional and geometric tolerances are strictly controlled, and the interference fit with the shaft is precise, with no looseness or misalignment after installation, ensuring overall bearing rotational accuracy, reducing wear of transmission components, and extending service life.

Wear-resistant and durable: Made of high-carbon chromium bearing steel with quenching and tempering treatment, it boasts high hardness and strong wear resistance. The smooth raceway surface reduces the coefficient of friction and minimizes heat generation during operation, making it suitable for harsh outdoor and dusty conditions, and extending maintenance intervals.

Highly adaptable: The dimensions are identical to the original manufacturer, perfectly matching the original outer ring. Replacement is convenient, requiring no additional adjustments, ensuring overall bearing performance is consistent with the original Cat®…