CAT 309-6263 BUSHING

CAT 309-6263 is a Caterpillar genuine steel-backed bimetallic bushing, suitable for boom/stick pins and connecting rod hinges on excavators, loaders, and other equipment. It is used to bear radial loads and reduce friction at the hinge points. The following is precise original part information:

Core Technical Parameters
Item Details
Part Model: CAT 309-6263 (3096263) Steel-backed Bimetallic Bushing, weight approximately 0.9 kg (1.98 lb), suitable for radial support conditions of boom, stick, and connecting rod hinge points

Core Material: The steel backing is Q345B low-alloy structural steel, with a base layer thickness of 3.0 mm; the friction-reducing layer is CuPb24Sn4 copper-lead alloy, with a thickness of 0.8-1.0 mm and a tin-plated surface, suitable for heavy-duty and vibration conditions in construction machinery

Key Dimensions: Inner diameter 50.8 mm (2.00 in), outer diameter 57.15 mm (2.25 in), width 63.5 mm 2.50 in, an integral oil-free self-lubricating structure with a positioning groove, suitable for articulated installations with a pin diameter of 50.8 mm.

Structural Features: Integral steel back + copper-lead alloy bimetallic structure, oil-free and self-lubricating, suitable for low-speed, heavy-load, and frequent oscillating conditions; the positioning groove prevents rotation, ensuring stable operation of the articulated parts and reducing pin wear.

Compatible Models: Compatible with CAT 320B/320C/325B excavators (boom/stick hinge bushings), 966F/972F wheel loaders (link hinge bushings), D6N/D6R bulldozers (ripper link bushings), etc.

Accessories: Compatible with boom/stick pins and link pins with a diameter of 50.8 mm; matching installation tools: CAT 1U-7360 bearing puller, 2S-8359 When installing the bushing sleeve, it is recommended to simultaneously check the pin wear and coaxiality.

Core Functions and Installation Points
* **Articulated Support and Friction Reduction:** Used in articulated parts such as booms, sticks, and connecting rods to bear radial loads, reduce friction between the pin and the mounting hole, and adapt to the frequent swinging and heavy-load conditions of construction machinery, ensuring smooth operation.

**Installation Specifications:** Clean the mounting hole and bushing surface, removing oil and burrs. Check the compatibility between the mounting hole tolerance (H7) and the bushing outer diameter tolerance (r6).

Use cold pressing, applying the sleeve evenly. Do not hammer. Ensure the bushing is not deformed and that the positioning groove is embedded in the mounting hole positioning structure.

After installation, check the radial clearance (0.04-0.08 mm) to ensure smooth operation and prevent jamming.

**Maintenance Recommendations:** Check the bushing wear and clearance every 1000 working hours. If the clearance exceeds 0.15 mm or if peeling or scratches appear on the surface, immediately replace with an original factory bushing.

When replacing, you must use the original CAT 309-6263 part of the same model to avoid premature failure of the hinge or damage to the pin due to incompatibility of size or material.