CAT 526-3051 80.2mm Inner Diameter Sleeve Bearing

CAT 526-3051 GD is a Caterpillar genuine straight-tube bimetallic heavy-duty sleeve bearing (GD represents high precision tolerance and surface finish grade), suitable for heavy-duty pivots such as booms, sticks, and connecting rods of loaders, excavators, and other equipment. The following are precise original factory specifications and application information, excluding replacement parts.

Core Technical Parameters

Item Details
Part Model: CAT 526-3051 GD (Straight Bimetallic Sleeve Bearing, GD High Precision Grade)

Product Type: Bimetallic Composite Sleeve Bearing, Steel Back + Anti-friction Alloy Layer, Suitable for Low-Speed ​​Heavy-Load, Oscillating/Reciprocating Conditions

Material: Steel Back: Q345B Alloy Steel; Anti-friction Layer: CuPb10Sn10 Lead-Tin Bronze, 5–10 μm Tin Plating; Steel Back Thickness: 4 mm; Alloy Layer Thickness: 2 mm

Key Dimensions: Inner Diameter: 100 mm (3.937 in), Outer Diameter: 120 mm (4.724 in), Length: 100 mm (3.937 in), Chamfered Ends: 1×45°, Wall Thickness: 10 mm

Rated Parameters: Rated Load Capacity: 35 MPa; Suitable Linear Speed: ≤ 1.5 m/s; Operating Temperature: -20℃ ~ +150℃; Coefficient of Friction: ≤ 0.06 (Oil Lubrication)
Single Weight: Approx. 2.01 kg (4.43 lbs)
Lubrication Adapter: With axial lubrication grooves and radial oil holes, compatible with lithium-based grease (NLGI 2), and central lubrication systems.
Tolerance Standards: Inner diameter tolerance H7, outer diameter tolerance m6, GD grade surface roughness Ra ≤ 0.4 μm, conforming to ISO 4389 standard.
Structure and Core Characteristics:
Bimetallic Composite Structure: Alloy steel backing ensures high rigidity and impact resistance; bronze anti-friction layer has strong impurity embedding ability, reducing pin wear; tin plating layer improves break-in performance and corrosion resistance, suitable for heavy-duty impact conditions.

GD Grade High Precision: Stricter surface roughness and dimensional tolerances; outer diameter interference 0.09–0.16 mm; no loosening during operation; higher positioning accuracy; reduced vibration and noise.

High-efficiency lubrication design: The combination of axial lubrication grooves and radial oil holes ensures even grease coverage of the contact surface, reducing friction and wear, and extending the life of bearings and pins.

Heavy-duty compatibility: The 10 mm thick-walled design can withstand large radial loads, making it suitable for heavy-duty pivots such as boom pins and stick pins, reducing the risk of deformation.

Compatible models and application scenarios:

Compatible equipment: CAT 966K/972K loaders, 336D2/349D2 excavators, and some bulldozers’ boom, stick, and connecting rod heavy-duty pivot joints.

Core purpose: Installed between the pin and structural components, it provides low-friction support, absorbs impact loads, prevents direct wear between the pin and structural components, ensures flexible joint operation, and reduces maintenance frequency.