CAT 515-4362 SLEEVE

CAT 515-4362 is a Caterpillar steel-backed aluminum-based composite wear-resistant sleeve, suitable for the boom/stick pin parts of Cat 336D2/349D2 excavators and 966K loaders. It is used to bear radial loads at the hinge and reduce pin wear, and is a core wear-resistant component of hydraulic working devices. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 515-4362, Type: Straight-tube composite sleeve, Material: Steel backing + high-tin aluminum alloy (Steel backing Q345B, alloy layer tin content 11-13%, thickness 0.4-0.6 mm), Single weight approximately 1.2 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 0.035-0.050 mm), Surface treatment: Zinc plating passivation, Matching pin 515-4361, Sealing ring 515-4363

Key Dimensions
Inner diameter 95 mm (Tolerance H7, +0.035/+0.000 mm), Outer diameter 105 mm (Tolerance s7, +0.050/+0.035 mm), Length 80 mm (Tolerance…) ±0.10 mm), wall thickness 5 mm, oil groove specifications: 2 axial grooves (3 mm wide × 1 mm deep), 4 radial oil holes (4 mm diameter, evenly distributed), chamfer r=2 mm (tolerance ±0.15 mm), surface roughness Ra≤0.8 μm, cylindricity≤0.008 mm. Compatible Models and Applications: Compatible with Cat 336D2/349D2 excavator boom – stick hinge pin, 966K loader rocker arm pin, used to absorb impact loads at the hinge, protect the pin and mounting hole, matching bearing housing 515-4360, radial load ≤280 kN, allowable swing angle ≤±3°. Performance Parameters: Radial compressive strength ≥900 MPa, coefficient of friction ≤0.12 (grease lubrication), wear life ≥8000 hours, corrosion resistance conforms to ISO 9227 neutral salt spray test for 72 hours without rust, impact toughness ≥40. J/cm², coefficient of thermal expansion 12.5×10⁻⁶/℃, anti-adhesive wear temperature ≥220℃
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 3 times compared to pure steel sleeves, suitable for heavy-duty impact conditions.

High-Efficiency Lubrication Design: Axial oil grooves + radially distributed 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 between the pin and sleeve, preventing gap expansion due to uneven wear, and extending the overall life of the hinged joint.

Strong Adaptability: Designed specifically for Cat medium and large 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 8-10 kN. After pressing, check the end face flatness to be ≤0.05 mm, ensuring the oil hole aligns with the machine body’s oil passage.**

Every 2500 hours of maintenance, check the clearance between the sleeve and the pin. The standard clearance is 0.020-0.045 mm. Replace the sleeve immediately if the clearance is >0.10 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.