CAT 380-7380 BEARING-SLV-GD

CAT 380-7380 (3807380) YM sleeve bearing (straight sleeve type, no flange) is primarily compatible with steering knuckle pins, connecting rod pins, or rocker arm shafts of CAT 980G/980H loaders, D9 bulldozers, and other models. It is used to withstand radial loads under heavy-duty swinging conditions, reducing friction and wear between the pin and the bore, and ensuring the stability of connected components. The YM designation usually indicates a high-quality replacement for the MYWAY brand. The following is the core information:

Core Technical Parameters
Item Details
Part Model: CAT 380-7380 (3807380) Straight Sleeve Bearing (YM brand, steel back + copper alloy bimetallic structure, no lubrication hole, suitable for pin clearance installation)

Core Material: Steel back: Low carbon alloy steel (Q235), thickness 2–3 mm, good weldability; Inner liner: Tin bronze (CuSn8P), centrifugally cast, surface precision machined (Ra≤0.8 μm), self-lubricating + Wear-resistant, suitable for heavy-duty oscillating conditions.

Key Dimensions: Inner diameter 80 mm, outer diameter 95 mm, length 60 mm, wall thickness 7.5 mm; compatible pin diameter 80 mm (pin surface hardness HRC≥58); installation tolerance H7/s6 (interference fit).

Single Weight: Approx. 1.2 kg.

Compatible Machines: CAT 980G/980H loaders (steering knuckle pins/connecting rod pins), D9/D9T bulldozers (rocker arm shafts/balance beam pins), 966H loaders (boom cylinder pins). Used in oscillating connection parts such as steering, suspension, and boom, bearing radial heavy loads and oscillating friction.

Working Fit: Maximum radial load 120 kN, operating temperature -20℃ to +120℃, compatible with lithium-based grease (NLGI 2), can withstand impact loads and oscillating friction, wear life ≥5000 hours. Working Hours
Core Functions and Structural Features
Bimetallic Wear-Resistant Structure: The steel backing provides high-strength support, while the tin bronze liner offers excellent friction reduction and embedding properties, accommodating minute impurities and reducing the coefficient of friction between the pin and bearing (f≤0.15). This adapts to heavy-load oscillating conditions and reduces component wear.

No Lubrication Hole Design: Suitable for pre-lubricated pins or centralized lubrication systems. After installation, oil is supplied through the pin lubrication channel, ensuring sufficient lubrication and preventing localized wear caused by blocked lubrication holes. This adapts to harsh working conditions.

Interference Fit Fixing: The outer diameter and mounting hole have an interference fit (0.02–0.04 mm), ensuring no looseness after installation. This guarantees the coaxiality of the bearing and components, suppresses eccentricity during oscillation, and reduces vibration and noise.

Impact and Deformation Resistance: The steel backing + copper alloy structure has a yield strength ≥300 MPa, adapting to the impact loads and load fluctuations of engineering machinery, preventing bearing deformation and cracking, and extending component life.

Installation and Maintenance Points

Installation Specifications: Clean the mounting holes and pins. The surface roughness of the mounting holes should be Ra≤1.6 μm, free of burrs and dents. The surface hardness of the pins should be HRC≥58, and the diameter tolerance should be h6 (0–-0.03 mm).

Assemble the bearing using cold pressing or heating the mounting holes (≤100℃). The bearing end face should be flush with the mounting hole end face, without skewing. The interference fit should be controlled within 0.02–0.04 mm to avoid excessive interference fit that could cause bearing deformation.

After installation, apply lithium-based grease (NLGI 2) to ensure sufficient lubrication between the pin and the bearing liner, reducing friction and wear.

Maintenance Recommendations: Check every 800 working hours: bearing clearance >0.2 mm, liner wear, surface scratches. Replace any faulty parts immediately. Simultaneously check pin wear (>0.1 mm requires repair).

When replacing bearings, prioritize original equipment manufacturer (OEM) parts or YM-certified parts to ensure that the materials, dimensional accuracy, and surface treatment meet standards. This prevents ordinary bearings from causing rapid wear of pins and holes, and loosening of connecting parts.

Simultaneously check the lubrication system to ensure unobstructed oil supply. Clean lubrication channels if necessary to ensure effective bearing lubrication and reduce the risk of secondary failures.