CAT 388-2516 70mm Outside Diameter Straight Sleeve Bearing

CAT 388-2516 is a Caterpillar genuine straight sleeve bushing, suitable for the boom and stick hinge areas of Cat 336D2, 349D and other excavators. It reduces friction at the hinge, absorbs impact, and positions components. The following is pure original data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 388-2516, Type: Straight cylindrical flangeless bushing, Material: Alloy structural steel (42CrMo, quenched and tempered, hardness HB280-320), Surface Treatment: Carburizing and quenching + low-temperature tempering (carburized layer depth 0.8-1.2 mm, surface hardness HRC58-62), Single Weight: 0.82 kg, Applicable Working Conditions: Heavy load, high-frequency impact, Working Temperature: -40℃ to +120℃, Lubrication Method: Grease lubrication (compatible with Cat Moly-Dee grease), Protection Rating: IP65

Key Dimensions
Inner Diameter: φ50 mm (tolerance 0/+0.025 mm), Outer Diameter: φ65 mm (tolerance 0/-0.015 mm), Total Length: 80 mm (tolerance ±0.15 mm), Wall Thickness: 7.5 mm, Chamfer at both ends: 1×45°, Inner Hole Surface Roughness: Ra≤0.4 μm, outer cylindrical surface roughness Ra≤0.8 μm, roundness≤0.005 mm, cylindricity≤0.008 mm

Performance Parameters: Rated static load 180 kN, rated dynamic load 120 kN, coefficient of friction ≤0.08 (grease lubrication), wear life ≥5000 hours (normal operating conditions), compressive strength ≥1000 MPa, yield strength ≥800 MPa, elongation at break ≥12%, corrosion resistance (no rust after ≥120 hours of salt spray test)

Structural and Performance Advantages:

42CrMo alloy material: tempered and carburized, balancing core toughness and surface wear resistance, suitable for heavy-load and impact conditions in excavator articulation parts.

High-precision dimensional control: strict tolerances for inner and outer diameters, small roundness and cylindricity errors, ensuring precise fit with pins and mounting holes, reducing clearance wear.

Carburized Layer Strengthening: The surface carburized layer is 0.8-1.2 mm deep with a hardness of HRC58-62, significantly improving surface wear resistance and extending bushing service life.

Strong Compatibility: Compatible with the boom and stick hinges of excavators such as Cat 336D2 and 349D, effectively reducing friction at the hinge points, absorbing impact loads during operation, and ensuring operational stability.

Installation and Maintenance Points (Original Data)

Installation: Clean the inner and outer surfaces of the bushing and the mounting holes (free from oil, impurities, and scratches). Use cold pressing for installation (pressing force 8-10 kN). After installation, ensure the bushing end face is flush with the mounting hole end face (deviation ≤0.1 mm). After pressing, check the inner hole dimensions (ensuring a pin-buckle clearance of 0.05-0.10 mm). Apply Cat Moly-Dee grease, install the pin, and tighten (torque according to the corresponding model manual). Maintenance: Add grease every 250 hours (5-8 g each time), check bushing wear every 1000 hours (replace if inner diameter wear > 0.2 mm), check for bushing looseness every 2000 hours (re-press or replace if loose), avoid overloading (overloading can easily cause bushing deformation), and regularly clean impurities from hinge areas (to prevent impurities from entering the friction surface and accelerating wear).

Troubleshooting: Excessive clearance is due to bushing wear; replace the bushing and check for pin wear; abnormal noise is often due to insufficient lubrication or impurities; add grease and clean; bushing deformation is due to overload or improper installation; replace the bushing and check the installation process and operating load.