CAT 583-3305 BEARING-INNER-GD

CAT 583-3305 (5833305) GD is a Caterpillar Bi-Metal Composite Cylinder Eye Bearing. It is primarily used in the boom cylinder and arm cylinder clevis hinge areas of CAT 320D/323D/329D excavators, 950M/966M loaders, and other models. The GD version is a high-wear-resistant reinforced version designed to withstand heavy radial loads and reciprocating oscillations. It is grease-lubricated to ensure long-term stable operation at the cylinder and connecting rod/frame hinge, reducing wear on the pin and clevis seat bore. The following is the core information:

Core Technical Parameters
Item Details
Part Model: CAT 583-3305 (5833305) GD Bimetallic Cylinder Ear Bearing (with Lubrication Groove + Oil Injection Hole)
Core Material: 42CrMo steel backing + copper-lead alloy (CuPb10Sn10) bimetallic layer, steel backing quenched and tempered (HRC 30–35), alloy layer thickness 0.8–1.0 mm, surface self-lubricating + grease lubrication composite design
Key Dimensions: Inner diameter 60 mm, outer diameter 75 mm, length 75 mm, wall thickness 7.5 mm, chamfered ends 1×45°, radial oil injection hole diameter 4 mm, axial lubrication groove width 3 mm, depth 1 mm
Single Weight: Approx. 0.65 kg
Compatible Models: CAT 320D/320D2/323D/329D excavators, 950M/966M Loaders and D6N/D7E bulldozers commonly use lug nuts on the boom cylinder and upper hinge point on the boom cylinder.

Lubrication Method: Grease lubrication (NLGI Grade 2 lithium-based grease), with an oil injection hole and axial lubrication groove to ensure uniform oil film coverage and reduce the coefficient of friction.

Core Functions and Structural Features:

Bimetallic Composite Structure: The steel backing ensures high strength and deformation resistance, while the copper-lead alloy layer provides excellent friction reduction and embedding properties, suitable for harsh working conditions such as dust and mud in construction machinery, preventing seizing with the pin and reducing abnormal wear.

Heavy-Duty Bearing Capacity: The 42CrMo steel backing has a yield strength ≥900 MPa, capable of withstanding the large loads and impacts generated by the reciprocating motion of the cylinder, preventing deformation and breakage of the lug nut, suitable for high-frequency operations such as heavy-duty excavation and loading.

High-Efficiency Lubrication Design: Radial oil injection holes combined with axial lubrication grooves quickly form a stable oil film after grease injection, reducing frictional resistance at the hinge, reducing abnormal noise and the risk of jamming, and extending the service life of bearings and pins. Precise and stable assembly: The straight cylindrical stepless design is compatible with the earring seat hole. The chamfered ends facilitate pressing. After pressing, it fits tightly with the seat hole, ensuring precise positioning and preventing loosening, thus guaranteeing the stable movement trajectory of the hydraulic cylinder.