CAT 105-8129 319.47mm Outside Diameter Flanged Sleeve Bearing

CAT 105-8129 is a Caterpillar single flange wear-resistant bushing, which is compatible with the stick, boom, or connecting rod pin holes of Cat 315C/315L/317 excavators. Its core function is to reduce friction and wear between the pin and the hole, withstand heavy loads and impacts, and ensure flexible operation of the articulated parts. It is a key wear part for the connection between the boom and stick. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 105-8129, Type: Single Flange Wear-Resistant Bushing, Material: Tin Bronze (ZCuSn10Pb1, self-lubricating with oil), Single Weight: Approx. 1.8 kg, Applicable Temperature: -20℃ to +120℃, Coefficient of Friction ≤0.15, Rated Bearing Pressure: 250 MPa, Lubrication Method: Oil/Grease compatible, Assembly Method: Interference fit (Interference amount 0.03-0.05 mm)

Key Dimensions
Inner Diameter: 50 mm (Tolerance 0 to -0.015 mm), Outer Diameter: 65 mm (Tolerance 0 to +0.02 mm), Total Length: 80 mm (Tolerance ±0.1 mm), Flange Outer Diameter: 85 mm (Tolerance ±0.15 mm), Flange Thickness: 10 mm (Tolerance ±0.08 mm), Flange Positioning Step Height: 3 mm, Inner Hole Surface Roughness Ra≤0.8 μm, inner and outer circle coaxiality ≤0.02 mm
Compatible Models and Applications: Compatible with the boom and stick hinge joints, and connecting rod and boom connection pin holes of Cat 315C, 315L, and 317 excavators. Matching parts include hinge pins (105-8130), locking washers, and locking bolts to support the hinge pins, reduce relative motion wear, and withstand radial and impact loads during excavation.
Performance Parameters: Bushing surface hardness HB180-220, compressive strength ≥600 MPa, tensile strength ≥200 MPa, fatigue life ≥5×10⁵ cycles, wear rate ≤0.01 mm/1000 hours, maximum oscillation angle ±30°, maximum oscillation frequency 5 times/second
Structural and Performance Advantages: Wear-resistant and self-lubricating: The tin bronze material has a high oil content and excellent self-lubricating properties, reducing friction and wear at the hinge joints, increasing the lifespan by approximately 2 seconds compared to ordinary steel bushings. Superior performance, adaptable to harsh working conditions such as dust and vibration, reducing the frequency of lubrication and maintenance.

Precise positioning: The single-flange structure enables axial positioning, preventing bushing movement within the pin hole. The high precision of the flange positioning step and pin hole ensures coaxiality between the hinge pin and bushing, reducing impact and noise at the hinge joint.

Heavy-duty adaptability: The high compressive strength of the material allows it to withstand the heavy loads and impacts of excavator digging operations. The interference fit ensures structural stability after installation, preventing bushing loosening and guaranteeing connection rigidity and operational stability at the hinge joint.

Easy installation: The integral structure allows for quick pressing into the pin hole using a hydraulic press. The flange face can directly mate with the parts for positioning, simplifying the assembly process and facilitating rapid on-site replacement, reducing maintenance costs.

Installation and Maintenance Points
**Before installation, clean the pin hole and bushing surface, and check the bushing for cracks, deformation, and scratches.** Use a hydraulic press to press the bushing into the pin hole, ensuring the bushing and pin hole are coaxial and the flange surfaces are tightly fitted during the pressing process. After installation, check that the inner hole roundness is ≤0.02 mm to ensure the hinge pin can rotate freely.

Every 500 hours of maintenance, check the bushing wear. If the inner hole wear is >0.1 mm or the bushing shows cracks or loosening, replace it immediately. Regularly add lithium-based grease (Cat 2G-8310 recommended), adding only enough to overflow each time to ensure sufficient lubrication of the hinge area.

When replacing parts, prioritize original equipment manufacturer (OEM) parts. Aftermarket parts may experience accelerated wear due to insufficient material purity or machining precision, leading to premature damage to the hinge pin and pin hole, affecting equipment operating efficiency.