CAT 109-8069 Fan Drive Wear Sleeve

CAT 109-8069 is a wear-resistant sleeve specifically designed for Caterpillar fan drive systems. It is used for sliding support between the fan drive shaft and the hub/bearing housing, reducing relative wear between components. It is suitable for fan drive mechanisms of heavy equipment such as excavators and loaders, ensuring stable power transmission and system durability (Cat® Parts). The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 109-8069, Type: Fan-driven wear-resistant sleeve, Material: High wear-resistant bronze alloy (containing 8%-10% tin, 2%-4% lead), Surface self-lubricating treatment, Single weight approximately 0.5 kg, Suitable temperature: -30℃ to +120℃, Installation method: Clearance fit, Suitable for grease lubrication, Self-lubricating backup capability (Cat® Parts)

Key Dimensions
Inner diameter: 45 mm, Outer diameter: 55 mm, Width: 30 mm, Chamfer: 1×45°, Inner diameter tolerance: H7, Outer diameter tolerance: g6, Shaft fit clearance: 0.015-0.03 mm, Suitable shaft diameter: 45 mm, Suitable bearing housing bore diameter: 55 mm

Compatible Models and Parts
Compatible with Cat 320D/323D excavators C6.4 engine fan drive shaft, 966K Loader fan hub support, D6T bulldozer fan drive mechanism, installed between the fan drive shaft and the hub, supports the fan’s radial load. Suitable for speeds ≤1800 rpm and radial loads ≤20 kN.

Performance Parameters: Brinell hardness HB 90-110, tensile strength ≥250 MPa, coefficient of friction ≤0.15 (dry friction), wear rate ≤0.05 mm/1000 hours. Can operate under short-term oil-free conditions, extending component replacement cycles.

Structural and Performance Advantages:

Material Compatibility: Bronze alloy combines good wear resistance and self-lubrication, suitable for low-speed, medium-load operation in fan drive systems, reducing frictional loss between the shaft and the housing.

Self-Lubricating Backup: Special surface treatment forms a self-lubricating layer, providing short-term protection for the shaft and sleeve even with insufficient lubrication, reducing the risk of failure due to dry friction.

Reasonable Clearance Design: Precise fit clearance ensures smooth operation while avoiding vibration and noise caused by excessive clearance, balancing support stability and operational flexibility.

Strong adaptability to various working conditions: Wide temperature range, suitable for construction machinery operating in different ambient temperatures. Excellent resistance to harsh conditions such as dust and mud, extending service life.

Installation and maintenance points: Before installation, clean the inner and outer surfaces of the sleeve and the installation area to remove oil and burrs. Check the sleeve for cracks and deformation. Use manual press-fit to ensure the sleeve end face fits snugly with the positioning surface. After installation, check the shaft’s rotation flexibility for any jamming.

Maintenance every 1500 hours: Check the sleeve for wear. If the inner diameter wear exceeds 0.1 mm or there are severe scratches or peeling on the surface, replace it immediately. Regularly replenish grease to ensure adequate lubrication and avoid dry friction.

Prioritize genuine parts. Aftermarket parts may have substandard material composition or dimensional deviations, easily leading to poor fit after installation, accelerating shaft and sleeve wear, and affecting the stability of the fan drive system.