Description
CAT 8S-6250 RACE
| CAT 8S-6250 RACE |
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| CAT 521-9951 BEARING-SEM |
| CAT 102-2701 BEARING |
| CAT 149-8652 BALL |
The CAT 8S-6250 is a Caterpillar genuine torque converter/transmission raceway, compatible with 3306 and 3406 series engines and corresponding torque converter assemblies. It supports rotating components and bears axial loads. The following are the original factory specifications and application information; replacement parts are not included.
Core Technical Parameters
Item Details
Part Model: CAT 8S-6250 (Raceway Seat Ring / Thrust Seat Ring)
Material: 52100 high-carbon chromium bearing steel, hardened, hardness HRC 60-64, surface roughness Ra ≤ 0.08 μm, tensile strength ≥ 1800 MPa
Key Dimensions: Inner diameter 140 mm (5.512 in), outer diameter 180 mm (7.087 in), thickness 15 mm (0.591 in), chamfer 1×45°, thrust surface flatness ≤ 0.015 mm
Single Weight: Approx. 0.73 kg (1.6 lbs)
Tolerance Standards: Inner diameter tolerance P6 (+0.018/+0.002 mm), outer diameter tolerance p6 (-0.002/-0.018 mm), thickness tolerance ±0.02 mm
Core Characteristics High hardness and wear resistance, low coefficient of friction (≤ 0.005), impact resistant, suitable for high-speed (≤ 3000 rpm) and high-temperature (≤ 120℃) torque converter operating conditions, with rust-proof surface treatment.
Structure and Core Functions
Raceway Support: As the thrust race of the internal bearings of the torque converter, it provides stable axial support for rotating components, limits axial displacement, and ensures transmission accuracy.
Load Transmission: Bears the axial load generated during torque converter operation (maximum 50 kN), disperses pressure, and prevents direct contact wear between the bearing and the housing.
Wear Resistance Protection: The 52100 bearing steel has high surface hardness after quenching, resists pitting and spalling, is suitable for heavy-duty conditions requiring long-term continuous operation, and extends the service life of the torque converter.
Compatible Models and Application Scenarios
Compatible Equipment: CAT 3306, 3406, 3406B, and 3406C engines, commonly found in 627E, 627F, and 627G wheeled tractors/loaders, and the torque converter assemblies of some loaders and heavy-duty trucks.
Core Purpose: Installed between the torque converter housing and rotating components, it supports the bearings and withstands axial forces. Suitable for heavy-duty, frequent start-stop operations in construction machinery, ensuring the torque converter’s transmission efficiency and stability.
