CAT 077-4407 BEARING RETA

CAT 077-4407 is a Caterpillar genuine bearing retainer ring (pure original factory information, no additional description). It is a shaft-mounted flexible bearing retainer ring (external clamp type), compatible with CAT engineering machinery bearings and shaft components, used for axial positioning to prevent movement and ensure stable operation of bearings and related assemblies. Cat®…

Core Parameters and Information

Item Details
Part Model: CAT 077-4407 (0774407) Bearing Retaining Ring

Structure Type: Shaft-type elastic retaining ring with opening and double mounting jaws, external clamping axial limiting structure, suitable for axial positioning of bearing outer/inner rings (Cat®…)

Material: 65Mn spring steel, blackened surface oxide, hardness HRC47-51, tensile strength ≥1250 MPa

Key Dimensions: Inner diameter 47 mm, outer diameter 54 mm, thickness 1.5 mm, opening width 5 mm, jaw diameter 2.5 mm, suitable shaft groove width 1.6 mm

Performance Parameters: Operating temperature -40℃ to 180℃, elastic recovery rate ≥95%, shear strength ≥800 MPa, anti-loosening axial force ≥8.5 kN

Compatibility Standard: Complies with CAT retaining ring technical specifications, dimensional accuracy IT9 grade, surface roughness Ra≤1.6 μm Compatible Models and Assemblies

Compatible Parts: Bearings, shafts, bushings, and other components requiring axial positioning. Commonly used for axial limiting of bearing inner/outer rings.

Compatible Equipment: CAT 326D2/336D2 excavators, 986M loaders, D7E bulldozers, etc. Used for axial positioning of shafts in bearing-related assemblies such as gearboxes, hydraulic pumps, travel mechanisms, and slewing bearings.

Installation: 1-2 pieces depending on the model and location. Installed in the shaft groove to prevent axial movement of the bearing and related parts.

Installation and Maintenance Points

Before installation, clean the shaft groove, bearing end face, and retaining ring. Check the retaining ring for deformation, cracks, normal elasticity, and intact clamp holes.

Use shaft retaining ring pliers to pry open the retaining ring, insert it into the shaft groove, and ensure it is fully engaged with the bearing end face without gaps.

After installation, check that the bearing axial movement is ≤0.03 mm, operates smoothly without jamming or abnormal noise, and that the retaining ring shows no signs of loosening.

Maintenance: Check the elasticity and installation condition of the retaining ring every 2000 hours. Replace it immediately if it is deformed, loses elasticity, or breaks to prevent the bearing from shifting and causing damage to the components.