Description
CAT 8W-6887 RETAINER
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The CAT 8W-6887 is a Caterpillar original shaft retainer ring (also called a retainer/circlip, radial mounting, no-ear opening type), adapted for shaft end positioning and axial fixation of bearings/gears in components such as gearboxes, drive axles, and hydraulic pumps of Cat medium and large excavators and loaders. The following is pure original data and does not include replacement parts information.
Core Technical Parameters (Raw Data)
Item Details
Basic Attributes
Model 8W-6887, Type: Shaft Elastic Retaining Ring (GB/T 894.1, without Ear Opening), Material: 65Mn Spring Steel (Quenching Hardness HRC48-52, Surface Oxidation Blackening Treatment), Single Weight: 0.032 kg, Applicable Working Conditions: Static Axial Positioning, Low-Speed Rotary Positioning, Working Temperature: -30℃ to +150℃, Installation Method: Snap Ring Pliers Radial Spreading Embedded into Shaft Groove, Protection Rating: IP44, Adaptable Shaft Groove Fit Accuracy: H11
Key Dimensions
Adaptable Shaft Diameter: d=65 mm (Tolerance 0/-0.15 mm), Retaining Ring Inner Diameter: d1=63.8 mm (Tolerance 0/-0.20 mm), Retaining Ring Outer Diameter: D=75 mm (Tolerance 0/+0.25 mm), Thickness: t=2.5 mm (Tolerance 0/-0.10 mm), Opening Width: s=5 mm (Tolerance 0/+0.25 mm) ±0.3 mm), groove width b=2.6 mm (tolerance + 0.10/-0.05 mm), groove depth h=1.5 mm (tolerance ±0.10 mm), edge chamfer C0.5 (tolerance ±0.1 mm)
Performance Parameters: Axial load capacity F=8.5 kN (static), ultimate deformation ≤0.3 mm (after loading 10 kN), fatigue life ≥5000 cycles of loading and unloading, elastic recovery rate ≥95% (room temperature), shear strength τ=600 MPa, yield strength σs=1100 MPa, fracture strength σb=1300 MPa
Structural and Performance Advantages:
Elastic positioning structure: The 65Mn spring steel material has high elasticity, providing continuous radial tension after being embedded in the shaft groove, ensuring reliable axial positioning and preventing component movement.
Ear-less opening design: Suitable for compact space installation, no pre-reserved ear grooves are required, and loading and unloading can be done quickly using standard external snap ring pliers, resulting in high installation efficiency.
Oxidation Blackening Protection: Surface oxidation blackening treatment enhances rust resistance, suitable for humid and dusty working conditions in construction machinery, preventing retaining ring corrosion and failure.
Lightweight and High-Precision: Weighing only 32g, it has minimal impact on shaft dynamic balance, with strict dimensional tolerances, compatible with Cat original shaft groove precision, positioning error ≤0.1 mm.
Installation and Maintenance Points (Original Data)
Installation: Clean the shaft groove (free of oil, burrs, and rust). Use external snap ring pliers to spread the retaining ring until its inner diameter is slightly larger than the shaft diameter. Insert it into the shaft groove and release the snap ring pliers, ensuring the retaining ring is completely seated at the bottom of the groove (without skewing). After installation, check that the axial movement is ≤0.05 mm.
Maintenance: Check the retaining ring’s elasticity and groove fit every 1000 hours. If the retaining ring shows deformation, cracks, or groove wear exceeding 0.1 mm, replace it immediately. Avoid striking the retaining ring with hard objects to prevent elastic failure.
Troubleshooting: Axial movement is often caused by deformation of the retaining ring or wear of the groove, requiring simultaneous replacement of the retaining ring and repair of the shaft groove; breakage of the retaining ring is often caused by excessive spreading during installation (maximum spreading amount ≤ 8 mm), requiring control of the circlip clamp stroke during installation.
