CAT 165-8386 1.94\ Plain Bushing

CAT 165-8386 is a Caterpillar genuine bimetallic composite bushing (steel back + bronze alloy layer), suitable for the boom, stick, and bucket pin hinge joints of excavators, loaders, and other construction machinery. It reduces friction and wear between the pins and connecting rods. The following is raw data and does not include replacement parts information for Cat®…

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 165-8386, Type: Bimetallic Composite Bushing, Material: Steel Backing (Q345) + Bronze Alloy (CuSn10Pb10), Single Weight: 1.25 kg, Operating Temperature: -40℃ to +120℃, Rated Radial Load ≤120 kN, Coefficient of Friction ≤0.12 (Oil Lubrication), Corrosion Resistance: 96-hour Salt Spray, Surface Treatment: Tin Plating Passivation, Installation Method: Cold Press/Hot Mounting, No Self-Lubricating Structure, Requires Regular Grease Application

Key Dimensions (Metric/Imperial)
Inner Diameter: 50 mm (1.969 in), Outer Diameter: 60 mm (2.362 in), Length: 75 mm (2.953 in), Wall Thickness: 5 mm (0.197 in), Inner Diameter Tolerance: +0.02/-0.01 mm, Outer Diameter Tolerance: +0.03/-0.01 mm, Length Tolerance: + 0.1/-0.05 mm, C1 mm chamfer at both ends, Ra≤0.8 μm inner hole surface roughness, cylindricity of outer diameter≤0.015 mm

Performance Parameters: Surface hardness HB 80-100 (bronze layer), steel back hardness HB 180-200, tensile strength ≥550 MPa (steel back), bronze layer bonding strength ≥150 MPa, wear life ≥8000 hours (normal operating conditions), interference fit 0.02-0.03 mm, suitable pin diameter 50 mm (tolerance + 0.01/-0.005 mm)

Structure and Fitting Characteristics: Bimetallic wear-resistant structure: The steel back provides high-strength support, and the bronze alloy layer has excellent friction reduction and anti-galling properties, suitable for heavy-load, low-speed oscillating conditions, effectively absorbing impact loads and reducing pin wear.

Precise Dimensional Fit: Strict tolerance control ensures a tight fit between the bushing and connecting rod holes/pins, preventing loosening after installation and guaranteeing the motion accuracy of the hinged parts, reducing vibration and noise caused by clearances.

Lubrication System Compatibility: Compatible with centralized lubrication systems in construction machinery. Regular application of lithium-based grease can further extend service life. Suitable for harsh working conditions such as dust and humidity, providing excellent corrosion resistance.

Compatible Models and Application Scenarios:

Excavators: Compatible with the boom-stalk hinge and stick-bucket hinge of models such as 320GC and 330GC, used to withstand heavy loads and impact loads during excavation operations, ensuring operational stability.

Loaders: Compatible with the bucket connecting rod and boom hinge of models such as 966K and 972K, used to transmit power and withstand radial loads during loading operations, reducing component wear.

Others: Compatible with the chassis hinges of some Caterpillar bulldozers and graders, suitable for low-speed, heavy-load oscillating conditions, ensuring the reliability of chassis structure connections.

Installation and Maintenance Points (Original Data)

Installation: Clean the connecting rod bore, pin, and bushing, ensuring they are free of oil and metal shavings. Inspect the bushing for cracks, deformation, or alloy layer peeling, and ensure the inner bore is smooth and free of scratches.

For cold-press installation, the pressing force should be ≤100 kN. For hot-press installation, the heating temperature should be 80-100℃. Ensure the bushing is properly installed, with its end face flush with the connecting rod bore, without any misalignment. After installation, the inner bore roundness should be ≤0.02 mm.

After installation, add NLGI 2 lithium-based grease and run for 1 hour, checking for abnormal heating or noise at the hinge joint.

Maintenance: Check the lubrication status every 500 hours and replenish grease. Check the bushing wear every 2000 hours. Replace the bushing immediately when the inner bore wear exceeds 0.15 mm to prevent excessive wear on the pin and connecting rod.

Use a dedicated pulling tool during disassembly to avoid damaging the bushing and connecting rod bore. Do not hammer or strike the bushing to prevent deformation or alloy layer peeling.