CAT 130-2998 BUSHING

CAT 130-2998 is a steel-backed copper alloy self-lubricating bushing for Caterpillar construction machinery. It is commonly used in hinged parts such as the boom, stick, and connecting rod of loaders and excavators. Its core function is to reduce friction between the pin and the support, absorb shock, and compensate for angular misalignment. The following is structured technical and application information from Cat® Parts.

Core Technical Parameters

Item Details
Basic Attributes Model 130-2998, type is straight-tube flangeless steel-backed copper alloy bushing, self-lubricating (PTFE + lead composite layer), steel back material Q345B, copper alloy layer material CuSn8P, surface treatment: galvanized and passivated steel back, single weight approximately 0.8 kg, operating temperature -40℃ to +120℃, compatible grease is NLGI Grade 2 lithium-based grease, fit tolerance: inner diameter H7, outer diameter r6

Key Dimensions Inner diameter 50 mm, outer diameter 60 mm, total length 80 mm, wall thickness 5 mm, chamfer 1×45°, copper alloy layer thickness 0.8 mm, PTFE layer thickness 0.2 mm, radial clearance 0.08-0.12 mm, surface roughness Ra≤0.8 μm

Compatible Models and Parts Compatible with Cat 950M/962M For loaders and 320D2/323D2 excavators, this product includes 1-2 pieces for each boom hinge, stick link, and bucket pin, with a pin diameter of 50 mm and a rated static load ≤150 kN.

Performance Parameters: Radial rated load ≥100 kN, Axial rated load ≥60 kN, Coefficient of friction ≤0.05 (dry friction), ≤0.03 (grease lubrication), Fatigue life ≥8×10⁵ cycles (under rated load), Wear life ≥5000 hours, Allowable angular deviation ≤0.5°.

Structural and Performance Advantages:

Composite layer design: The steel backing provides high-strength support, the copper alloy layer bears load and conducts heat, and the PTFE self-lubricating layer reduces friction, eliminating the need for frequent lubrication. It can still work stably under harsh conditions, and its wear life is approximately twice that of pure copper bushings.

Flangeless straight cylinder structure: Adapts to various mounting holes, simplifies installation, can withstand radial loads, is suitable for space-constrained hinged parts, provides high precision with the pin, and reduces vibration and noise. Self-lubricating properties: The composite layer contains solid lubricant, requiring no additional lubrication during initial operation. Later grease application further extends service life, making it suitable for parts difficult to maintain regularly.

Impact resistance and wear resistance: The steel backing and copper alloy layer are tightly bonded, absorbing impact loads at hinged joints. The copper alloy layer has a hardness ≥80 HB, providing strong wear resistance and making it suitable for heavy-duty and frequent oscillating conditions.

Installation and maintenance points:
Installation procedure: Clean the mounting hole and bushing surface, checking for deformation and cracks in the bushing; use a special pressing tool to press the bushing into the mounting hole, ensuring a tight fit between the bushing and the hole wall without looseness; after pressing, check the inner diameter to ensure the clearance with the pin meets requirements; install the pin and apply grease, then install the dust seal to prevent foreign objects from entering.

Maintenance Cycle: Check bushing wear every 800 hours; replace when inner diameter wear > 0.5 mm; add grease every 1500 hours, shortening to 500 hours under harsh operating conditions; promptly inspect and replace if abnormal noise or looseness is found between the pin and bushing.

Common Faults and Solutions: Rapid bushing wear is often due to excessive load or insufficient lubrication, requiring bushing replacement and lubrication optimization; loose bushing may be due to insufficient interference fit, requiring re-pressing or replacement of the mounting hole; bushing cracks are often due to excessive impact load, requiring inspection of operating conditions and bushing replacement.