296-6268: Bearing – Needle(Debris Resistant)

CAT 296-6268 is a roller bearing assembly used by Caterpillar for powershift transmissions. It is designed for supporting the main/countershaft of heavy-duty equipment transmissions. Its core function is to provide stable radial support and axial positioning, ensuring efficient transmission of the gear set. It is suitable for heavy-duty operating conditions. Key information is as follows:

Core Parameters
Item Details
Type: Roller bearing assembly (including inner ring, outer ring, rollers, and cage), suitable for transmission main/countershaft, mounted in the transmission housing bearing seat, used to support high-speed rotating gear shafts, absorb radial loads, limit radial runout of the shaft, and ensure gear meshing accuracy.

Compatible Models: Cat 980K/L/M loaders, D9T/R bulldozers, 777E/F mining trucks, etc., suitable for powershift transmission assemblies with Cat C15 and C18 engines, used for bearing assembly replacement during transmission overhauls/major repairs.

Material and Manufacturing Process: Inner/Outer Ring: High carbon chromium bearing steel (GCr15), integrally quenched + Tempered, hardness HRC60-64; Rollers: GCr15SiMn, surface-hardened, hardness HRC62-66; Cage: Brass, stamped, with good wear resistance and thermal conductivity; Seal: Nitrile rubber (NBR) double-lip seal, preventing oil leakage and impurity intrusion.

Key Dimensions: Inner diameter 100mm (3.937 inches), outer diameter 180mm (7.087 inches), width 46mm (1.811 inches), weight approx. 3.8kg (8.38 lbs), radial clearance 0.015-0.035mm, compatible with gearbox bearing housing installation tolerances.

Installation Requirements: Transition fit with gearbox housing bearing housing (fit tolerance H7/js6), axial positioning via retaining ring, apply Cat-specific gearbox oil (TO-4) before installation, bolt preload torque 65-75 N・m, ensuring reliable bearing assembly fixation.

Functions and Suitable Scenarios:
Core Function: For gearbox spindle / The countershaft provides stable radial support, limiting radial runout, reducing gear meshing clearance variations, and lowering transmission noise and vibration. It is suitable for heavy equipment operating under frequent gear shifts and fluctuating loads, ensuring the transmission’s power transmission efficiency and reliability.

Suitable Scenarios: Used to replace worn, fatigued, or sealed bearing assemblies when experiencing transmission noise, abnormal gear wear, increased oil temperature, or decreased power transmission efficiency. This restores normal transmission operation and is suitable for internal transmission component replacement during major/minor overhauls.

Performance Characteristics: Made of high-carbon chromium bearing steel with an integral quenching process, it possesses high hardness, high wear resistance, and good toughness, capable of withstanding high-speed transmission operation and impact loads, suitable for long-term stable operation under heavy load conditions.

Brass cage and roller surface strengthening treatment reduces friction loss, improves heat dissipation, and extends bearing life.

Nitrile rubber double-lip seals effectively prevent transmission oil leakage and the intrusion of external dust, moisture, and other impurities, suitable for the high-temperature and high-pressure operating environment of the transmission.

Precise dimensional and tolerance control ensures compatibility with gearbox shafts and bearing housings, reduces installation errors, and improves gear transmission accuracy and stability.