130-3639: 169.48mm ID Retainer Freewheel Cam Sleeve

The Cat 130-3639 is a core component of the Caterpillar torque converter freewheel mechanism. It is a 169.48mm (6.672-inch) inner diameter retainer freewheel cam sleeve used for precise control of the freewheel clutch engagement and disengagement. It is compatible with heavy-duty equipment torque converter systems. Key information is as follows:

Core Parameters
Item Details
Type: Retainer freewheel cam sleeve, compatible with torque converter freewheel clutch, installed between the freewheel cam and stator shaft, providing cam positioning reference and axial guidance, ensuring precise switching of the freewheel one-way locking/unlocking function (Cat® Parts)
Compatible Models: Cat 980G/H loaders, D8R bulldozers, 777D mining trucks, etc.; compatible with torque converter assemblies for Cat 3406, 3508, etc. engines; used for internal maintenance of heavy-duty equipment torque converters (Cat® Parts)
Material and Process: Base material: 42CrMo alloy structural steel, integrally quenched and tempered, hardness… HRC38-42; Surface: Nitrided, depth 0.3-0.5mm, hardness HV500-600; Inner bore: Precision honing, surface roughness Ra≤0.8μm, compatible with stator shaft, ensuring assembly accuracy.
Dimensions (Metric/Imperial): Inner diameter 169.48mm (6.672 inches), outer diameter 200mm (7.874 inches), length 55mm (2.165 inches), weight approx. 1.2kg (2.65 lbs).
Mounting and positioning: Fits the torque converter housing; inner bore interference fits the stator shaft (fitting tolerance). (H7/p6), axially positioned via a retaining ring, with a clearance ≤0.05mm between the cam and freewheel cam end face, ensuring precise meshing of the cam and roller.

Functions and Application Scenarios

Core Function: Provides stable support and precise positioning for the freewheel cam, ensuring smooth separation of the cam and roller at high speed and low torque, and reliable engagement at low speed and high torque, guaranteeing efficient torque converter transmission and power switching. Suitable for Cat® Parts applications involving frequent start-stop and load fluctuations in heavy equipment.

Application Scenarios: Used to replace worn, deformed, or peeling cam sleeves when the torque converter experiences slippage, power interruption, or abnormal oil temperature rise, restoring the freewheel clutch function. Suitable for replacing internal torque converter components during major/minor overhauls.

Performance Characteristics
The alloy structural steel base material, combined with overall quenching and nitriding treatment, possesses high strength, high toughness, and excellent wear resistance, suitable for high-speed operation and impact load conditions of the torque converter, extending its service life.

Precision honing of the inner bore and nitriding of the surface reduce frictional losses with the stator shaft, improve transmission efficiency, and adapt to the high-temperature, high-pressure, and high-speed operating environment of the torque converter.

Precise dimensional and tolerance control ensures compatibility with cams and rollers, reduces vibration and noise, and improves the switching accuracy and reliability of the freewheel clutch.