CAT 471-5911 BUSHING-BEAR

CAT 471-5911 is a Caterpillar genuine steel-backed copper-lead alloy bearing bushing (sleeve bearing), suitable for the boom/stick hinge points of excavators such as the 320D/323D and the connecting rod hinge points of loaders such as the 950H/966H. It is used to bear radial loads and reduce friction at the hinge points. The following is the precise original part information:

Core Technical Parameters
Item Details
Part Model: CAT 471-5911 (4715911) bearing bushing, single weight approximately 1.2 kg (2.65 lb), suitable for low-speed, heavy-load, and frequently oscillating hinge support conditions

Core Material: Steel backing + CuPb24Sn4 copper-lead alloy anti-friction layer, steel backing thickness 3.2 mm, copper-lead alloy layer thickness 0.8-1.0 mm, tin-plated surface, suitable for heavy-load and vibration conditions of construction machinery, wear-resistant and anti-seize

Key Dimensions: Inner diameter 63.5 mm (2.50 in), outer diameter 70.0 mm (2.756 in), width 76.2 mm (3.00 in), integral oil-free self-lubricating structure with positioning groove, suitable for hinged installation with a pin diameter of 63.5 mm.

Structural Features: Integral bimetallic structure, oil-free self-lubricating, suitable for frequent oscillation and low-speed heavy-load conditions; positioning groove prevents rotation, ensuring stable operation of the hinged parts and reducing wear between the pin and the mounting hole.

Compatible Models: Compatible with CAT 320D/320D L/323D/325D excavators (boom/stick hinge bushing), 950H/966H/972H wheel loaders (link hinge bushing), D6K/D6T bulldozers (ripper link bushing), etc.

Accessories: Compatible with boom/stick pins and link pins with a diameter of 63.5 mm; matching installation tool CAT 1U-7360. When replacing bearing pullers and 2S-8359 mounting sleeves, it is recommended to simultaneously check pin wear and coaxiality.

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

Installation Specifications
Clean the mounting holes and bushing surfaces, 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 bushing evenly with a special sleeve. 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 (0.05-0.10 mm) to ensure smooth operation and prevent jamming.

Maintenance Recommendations
Check bushing wear and clearance every 1000 working hours. If the clearance exceeds 0.20 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 471-5911 part of the same model to avoid premature failure of the hinge or damage to the pin due to size or material mismatch.