CAT 137-6877 Differential and Bevel Gear Bearing Retainer

CAT 137-6877 is a Caterpillar genuine shaft retaining ring (circlip), a dedicated fastener for axial positioning of bearings. It is suitable for bearing assemblies in rotating components such as gearboxes, drive axles, and wheel hubs, and is used to limit axial movement of the inner/outer ring of the bearing, preventing bearing displacement, accelerated wear, or failure under impact conditions. Cat®…

Core Technical Parameters

Item Details
Part Model CAT 137-6877 Bearing Retaining Ring (Shaft Elastic Retaining Ring)

Material 65Mn spring steel, overall tempering + surface galvanizing/oxidation treatment, good elasticity, fatigue resistance, salt spray test ≥96h, suitable for dusty and humid working conditions of construction machinery Cat® …

Key Dimensions Free diameter 65mm (2.559in), groove diameter 63mm (2.480in), thickness 2.5mm (0.098in), width 3.5mm (0.138in), suitable shaft diameter 65mm, mounting groove width 3.5mm, groove depth 1.25mm Cat® …

Compatible Models Excavator 320D/323D, Loader 930K/950K, Road Roller CS68B, Engine C9.3, used for axial positioning of wheel hub bearings, differential bearings, gearbox output shaft bearings, and water pump bearings Cat® …Performance Features Flexible opening design ensures a tight fit to the shaft groove after installation, providing continuous preload; galvanized/oxidized surface for corrosion protection, suitable for heavy-duty and vibration conditions; precise dimensions ensure compatibility with bearings and shaft grooves, preventing assembly clearances from causing abnormal noise or displacement (Cat®…)
Core Functions and Installation Points
Axial Positioning and Anti-migration: Embedded in a dedicated groove on the shaft, it restricts the axial movement of the bearing inner ring, preventing collisions and wear between the bearing and adjacent components, ensuring rotational accuracy and transmission efficiency.
Installation Specifications
Clean the shaft groove and retaining ring, removing burrs and oil stains, ensuring no impurities affect the fit.
Use special retaining ring pliers to pry open the retaining ring and smoothly insert it into the shaft groove, ensuring it is fully engaged at the bottom of the groove without tilting or coming out.
After installation, check that the clearance between the retaining ring and the bearing end face is ≤0.1mm to ensure no axial movement of the bearing, while avoiding interference that could deform the retaining ring or damage the shaft groove.

Maintenance Recommendations:

Inspect every 800-1000 working hours. Check for deformation, breakage, corrosion, or loosening of the retaining ring. Replace it immediately if any issues are found.

When replacing the bearing, the retaining ring must be replaced simultaneously to prevent positioning failure caused by the elasticity degradation of the old retaining ring.

Store in a sealed, moisture-proof environment to prevent corrosion from affecting elasticity and assembly accuracy (Cat®…).