608-7311: BEARING-SLEE

CAT 608-7311 is a sleeve bearing for Caterpillar heavy machinery. It is suitable for hinges, pins, and other components in equipment, supporting rotary/oscillating motion and bearing heavy radial loads. Key information is as follows:

Key Parameters
Item Details
Type: Integral sleeve bearing (non-rolling element sliding bearing), bearing pure radial heavy loads, suitable for low-speed, oscillating, or intermittent rotation conditions, requires a pin and lubrication system.
Dimensions (Metric/Imperial): Inner diameter approx. 50.80mm (2 inches), outer diameter approx. 76.20mm (3 inches), length approx. 63.50mm (2.5 inches), compatible with corresponding pin diameters and mounting holes. Tolerance range: Inner diameter ±0.01mm, outer diameter ±0.015mm, length ±0.10mm
Material: Bearing-grade high carbon steel, nitrided surface, hardness HV800-1000, wear-resistant and anti-galling; some versions include a solid lubricating liner (PTFE). + Bronze), suitable for oil-free/low-oil operating conditions.

Structure: Integral cylindrical shape with axial lubrication grooves in the inner hole for easy grease distribution; some sections have oil holes for centralized lubrication systems. After installation, it has a clearance fit with the pin and an interference fit with the mounting hole.

Precision: Inner hole surface roughness Ra≤0.4μm, cylindricity error≤0.005mm, ensuring contact accuracy with the pin and reducing friction loss.

Suitable for: Boom, stick hinge points, connecting rod joints, hydraulic cylinder lugs, etc., on Cat 320D/323D excavators, 966H loaders, D6T bulldozers, etc., used to withstand radial loads under low speed and heavy loads, supporting the stable movement of hinged components.

Suitable for harsh working conditions such as mining and infrastructure construction, suitable for bushing replacement during routine maintenance and overhauls, preventing malfunctions such as increased hinge clearance, stuck movement, and abnormal noise caused by bushing wear.

Performance Characteristics
Integrated structure for easy installation; adaptable to corresponding pins and mounting holes, eliminating the need for complex adjustments and reducing maintenance time.
High-carbon steel with nitriding treatment provides excellent wear and anti-galling properties, extending service life by approximately 50% compared to ordinary carbon steel bushings.
The internal lubrication groove design facilitates grease storage and distribution, reducing frictional loss and improving the flexibility of articulation operations, conforming to Caterpillar equipment heavy-duty articulation standards.

Alternative Models
Direct replacements: 8T-4169, 107-6642; interchangeable and suitable for the same equipment and installation conditions.