CAT 389-6326 BEARING-SLV-GD

CAT 389-6326 YM is a genuine Caterpillar bimetallic sleeve bearing (shroud), commonly used in hinge pins, cylinder pins, or connecting rods of loaders, excavators, and other equipment. It is compatible with CAT 950G/966G loaders, 320D excavators, and other models, providing support, positioning, and friction reduction, ensuring smooth relative movement between the pin and the support, and extending component life.

Core Technical Parameters

Item Details
Part Model: CAT 389-6326 YM Bimetallic Sleeve Bearing, Original Part Number 3896326, no official direct replacement model. For non-original parts, refer to the same specification bimetallic bushing.

Material: Bimetallic structure: Steel back is Q235B low carbon steel, thickness 2.0mm; anti-friction layer is tin bronze (CuSn8P), thickness 1.0mm, oil content 15-20%, surface tin-plated for corrosion protection, suitable for dry friction and boundary lubrication conditions.

Key Dimensions: Inner diameter 80mm, outer diameter 90mm, length 60mm, wall thickness 5mm (steel back 2mm + bronze layer 1mm + clearance 2mm), suitable for pin diameter 80mm, fit clearance 0.05-0.10mm, dimensional accuracy conforms to ISO 4379 standard H7/g6 grade.

Compatible Models: CAT 950G/966G Loaders, 320D/330D excavators, and D6R bulldozers use this product for boom articulation pins, stick pins, bucket cylinder lower pins, and connecting rod sleeve bearings, adapting to rotating and sliding parts between pins and supports.

Performance Characteristics: The bimetallic structure balances strength and wear reduction. The steel backing bears heavy loads, while the bronze layer is wear-resistant and friction-reducing. The oil-impregnated design allows for short-term operation without lubrication. It is suitable for impact and vibration conditions, preventing direct wear between the pin and support, and reducing the coefficient of friction to 0.15-0.25.

Core Functions and Structure:

Load Bearing and Positioning: The steel backing provides sufficient load-bearing capacity to withstand the radial load transmitted by the pin, ensuring coaxiality between the pin and support, preventing component jamming or damage caused by pin misalignment, and adapting to the force transmission requirements under heavy-duty conditions.

Friction Reduction and Wear Resistance: The tin bronze friction-reducing layer forms a low-friction pair with the pin surface, reducing wear during relative movement. The oil-containing design stores lubricant, providing lubrication during boundary lubrication, reducing frictional loss, and extending the service life of the pin and sleeve.

Clearance Compensation: Adapts to the fit clearance between the pin and the support, absorbing assembly errors and component deformation, preventing impacts and vibrations caused by excessive clearance, ensuring smooth movement of the hinged parts, and reducing noise and component fatigue damage.

Installation and Maintenance Points
Installation Specifications: Clean the inner and outer surfaces of the sleeve, the pin, and the support hole, removing oil, metal filings, and burrs. Check the sleeve for cracks and deformation, and ensure the bronze layer is free of peeling and scratches. The support hole dimensions must meet tolerance requirements (interference 0.02-0.04mm).

Cold Press Installation: Use a special press to smoothly press the sleeve into the support hole. Do not strike the sleeve end face to avoid damage to the bronze layer. After pressing, check that the sleeve end face is flush with the support end face, without any misalignment.

After installation, check the clearance between the pin and sleeve. Ensure smooth rotation without jamming, and that relative movement is fluid. The clearance should meet the requirement of 0.05-0.10mm.

Maintenance Recommendations: Every 1000 working hours, check the sleeve for looseness, the bronze layer for wear or peeling, and the pin for scratches or wear. If the bronze layer wear exceeds 0.5mm, replace the sleeve immediately. If the pin is worn, replace both the pin and the sleeve.

Regularly add lubricating grease (such as CAT 2K-7000 lithium-based grease) to maintain adequate lubrication and prevent rapid wear caused by dry friction, suitable for long-term high-frequency operation.