CAT 625-7418 38.2mm Inner Diameter Sleeve Bearing

CAT 625-7418 is a Caterpillar steel-backed aluminum-based composite sleeve bearing with an inner diameter of 38.2 mm. It is used to fit the connecting rods, rocker arms, and other hinge pins of Cat mini excavators/loaders to bear radial loads and reduce pin wear. It is a core wear-resistant Cat® Parts component for small hydraulic workpieces. The following is structured technical and application information:

Core Technical Parameters
Item Details
Basic Attributes
Model 625-7418, Type: Straight-tube composite sleeve bearing, Material: Steel back + high-tin aluminum alloy (Steel back Q235, alloy layer tin content 12-14%, thickness 0.35-0.5 mm), Single weight approximately 0.32 kg, Applicable temperature: -40℃ to +180℃, Lubrication method: Grease lubrication (Recommended Cat Moly-Dee No. 2 lithium-based grease), Installation method: Interference fit (interference amount 0.025-0.040 mm), Surface treatment: Zinc plating passivation, Matching pin 625-7417, Sealing ring 625-7419

Key Dimensions
Inner diameter: 38.2 mm (Tolerance H7, +0.030/+0.000 mm), Outer diameter: 45 mm (Tolerance s7, +0.040/+0.025 mm), Length: 42 mm mm (tolerance ±0.08 mm), wall thickness 3.4 mm, oil groove specifications: 1 axial groove (width 2.5 mm × depth 0.8 mm), 2 radial oil holes (diameter 3 mm, symmetrically distributed), chamfer r=1.5 mm (tolerance ±0.10 mm), surface roughness Ra≤0.8 μm, cylindricity≤0.006 mm
Compatible Models and Applications: Compatible with Cat 305.5E2/306E2 excavator boom – connecting rod hinge pin, 906M loader rocker arm pin, used to absorb impact loads at the hinge, protect the pin and mounting hole, withstand radial load ≤120 kN, allowable swing angle ≤±2°
Performance Parameters: Radial compressive strength ≥850 MPa, coefficient of friction ≤0.12 (grease lubrication), wear life ≥6000 hours, corrosion resistance conforms to ISO 9227 neutral salt spray test for 48 hours without rust, impact toughness ≥35 J/cm², coefficient of thermal expansion 12.8×10⁻⁶/℃, anti-adhesive wear temperature ≥200℃
Structural and Performance Advantages

Composite Wear-Resistant Structure: The steel back provides rigid support, while the aluminum alloy layer offers excellent friction reduction and embedding properties, accommodating minute impurities and preventing pin scratches. Wear life is increased by approximately 2.5 times compared to pure steel sleeves, suitable for Cat® Parts in heavy-duty impact conditions on small equipment.

High-Efficiency Lubrication Design: Axial oil grooves + radially symmetrical oil holes ensure uniform grease coverage of the friction surface, forming a continuous oil film, reducing frictional resistance between the pin and sleeve, and minimizing the risk of dry friction under high-temperature conditions.

Precise Interference Control: Strict dimensional tolerances and interference fit design ensure no loosening after press-fitting, guaranteeing coaxiality of the pin and sleeve, preventing increased clearance due to uneven wear, and extending the overall life of the hinged joint.

High Adaptability: Designed specifically for Cat mini excavators/loaders, requiring no modification to the installation structure, facilitating maintenance and replacement, and reducing maintenance costs and downtime.

Installation and Maintenance Points
**Before installation, clean the sleeve and mounting hole. Use a hydraulic pressing tool to press it vertically, controlling the pressing force to 3-5 kN. After pressing, check the end face flatness to be ≤0.04 mm, ensuring the oil hole aligns with the machine body’s oil passage.**

Every 1500 hours of maintenance, check the clearance between the sleeve and the pin. The standard clearance is 0.015-0.035 mm. Replace the sleeve immediately if the clearance is >0.08 mm. When replacing, simultaneously check the pin wear and the roundness of the mounting hole; replace the entire sleeve if it exceeds the standard.

Prioritize original parts. Aftermarket parts must match the material composition and dimensional accuracy. Inferior sleeves can easily cause pin jamming, mounting hole wear, leading to abnormal noises in the working device or even structural deformation.