Description
CAT 8S-8550 RETAINER
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The CAT 8S-8550 is a Caterpillar genuine shaft retaining ring, suitable for positioning the shaft ends of rotating and transmission components in engineering machinery. It is used to lock bearings, gears, sleeves, and other parts to prevent axial movement. The following are precise original factory specifications and application information; replacement parts are not included.
Core Technical Parameters
Item Details
Part Model: CAT 8S-8550 (Shaft Elastic Retaining Ring, conforming to GB/T 894.1 standard)
Material: 65Mn spring steel, surface treated with black oxide coating, hardness HRC 42-48, elastic limit ≥ 1100 MPa, breaking strength ≥ 1300 MPa
Key Dimensions: Inner diameter 75.00 mm (2.953 in), outer diameter 85.00 mm (3.346 in), thickness 2.00 mm (0.079 in), opening width 8.00 mm, chamfer 0.5×45°, retaining ring groove diameter 78.00 mm, groove width 2.20 mm
Performance Parameters: Operating temperature -40℃ to +150℃, radial elastic force ≥ 800 N, axial load ≥ 5000 N, fatigue life ≥ 10000 cycles (alternating load conditions)
Unit Weight Approximately 0.09 kg (0.198 lbs)
Tolerances: Inner diameter tolerance ±0.10 mm, outer diameter tolerance ±0.15 mm, thickness tolerance ±0.05 mm, opening width tolerance ±0.20 mm
Core Characteristics: 65Mn spring steel provides high elasticity and toughness; the anodized black coating enhances rust resistance; it is suitable for quick shaft end positioning, easy installation and disassembly, and suitable for medium to heavy-duty applications.
Structure and Core Characteristics:
Elastic Structure Design: Utilizing an open-type circular ring structure, the elastic deformation of 65Mn spring steel enables quick shaft end installation. After installation, it provides continuous radial elasticity, ensuring a tight fit with the shaft groove and preventing loosening of the retainer.
Surface Treatment: The anodized black treatment forms a dense oxide film on the surface, achieving an IP54 rust resistance rating, suitable for harsh working conditions in dusty and humid engineering machinery, and extending component lifespan.
Precise Size Fit: Strictly matches the retaining ring groove size for a 75 mm shaft diameter, with the inner diameter and shaft groove tolerances perfectly matched to ensure no axial movement after installation and guarantee stable operation of transmission components.
Convenient Installation and Removal: Installation and removal can be performed using dedicated retaining ring pliers, eliminating the need for complex tools and meeting the needs of rapid on-site maintenance and replacement, improving work efficiency.
Compatible Models and Application Scenarios
Compatible Equipment: CAT 320, 323, and 329 series excavators, 950 and 966 series loaders, and some bulldozers and graders’ transmission systems, travel mechanisms, hydraulic motors, and other components, such as the travel motor output shaft, slewing bearing end, and gearbox shaft end.
Core Purpose: Installed in the retaining ring groove at the shaft end, it locks bearings, gears, sleeves, and other parts, preventing axial movement during operation, ensuring transmission system stability, and is suitable for medium- and heavy-duty, medium- and high-speed operating conditions.
