CAT 8W-7114 Flanged Sleeve Bearing

CAT 8W-7114 is a steel-backed copper alloy sliding bushing commonly used in Caterpillar construction machinery. It is suitable for the boom/stick joints of mini excavators and loaders, used for rotation and swing support under high loads. It can be used with 237-4360 sleeve and 575-1973 flange sleeve bearings. It has wear resistance, impact resistance, and self-lubricating capabilities, and is suitable for Cat® Parts in dusty working conditions. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 8W-7114, steel-backed copper alloy (CuSn8 bronze, steel backing Q235, bronze layer thickness 1.5-2.0 mm, surface tin plating 0.005 mm, porosity 15-20%, containing solid lubricant), single weight approximately 0.45 kg, operating temperature -30℃ to +150℃, load type is radial high load + bidirectional light axial load, friction coefficient ≤0.08 (oil lubrication), lubrication method is grease lubrication (recommended Cat 2V-9822 grease), design life ≥8000 hours (normal operating conditions)

Key Dimensions
Inner diameter 40 mm (tolerance 0/-0.015 mm, mating pin tolerance h7), outer diameter 50 mm (tolerance +0.012/0 mm, mating seat hole tolerance H7), length 38 mm (tolerance…) 0/-0.12 mm), wall thickness 5 mm, chamfered ends 1×45°, inner hole surface roughness Ra≤0.05 μm, outer circle cylindricity≤0.01 mm, end face parallelism≤0.01 mm
Compatible Models and Accessories: Compatible with Cat 307E2 excavator (boom-stick pin), 908M loader (bucket pin), 353E skid steer loader (working device joint), with matching 237-4360 sleeve assembly, 575-1973 flange sleeve bearing, 1J-0581 bearing cap, 474-9675 O-ring
Rated Load: Radial rated dynamic load Cr=45 kN, radial rated static load Cor=120 kN, allowable linear velocity ≤1.5 m/s (grease lubrication) / ≤3 m/s (oil lubrication), impact load ≥25 kN, ultimate pressure ≥200 MPa Installation and Maintenance Points: Before installation, clean the inner and outer surfaces of the bushing, pin, and seat hole. Check for cracks, rust, and deformation. Measure the dimensions of the seat hole (50 mm, H7 tolerance) and pin (40 mm, h7 tolerance) to ensure an interference fit of 0.010-0.025 mm.

Use cold pressing for installation. Apply pressure evenly to the bushing end face using a special press. Do not strike the copper alloy surface. After installation, check the bushing’s rotation flexibility. Ensure there is no jamming or abnormal noise. Axial movement should be ≤0.05 mm, and the coaxiality between the inner hole and pin should be ≤0.02 mm.

Maintenance and Replacement: Check the bushing’s wear and lubrication condition every 1000 hours. If the inner diameter wear is >0.2 mm or the surface copper layer is peeling off, replace immediately. It is recommended to replace the bushing simultaneously with the pin and seals to ensure joint connection accuracy and sealing effect.