CAT 366-9273 Straight Sleeve Bearing

CAT 366-9273 is a Caterpillar straight steel-backed bronze sleeve bearing (oilless self-lubricating type), suitable for pins, connecting rods or guide parts of excavators and loaders. It is used to bear radial loads, reduce friction and position the shaft system. It is suitable for medium and low speed and medium load conditions and is a key wear-resistant component of transmission and connection parts. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 366-9273 (Straight Sleeve Bearing/Bushing), type: steel back + sintered bronze layer + PTFE self-lubricating layer, material: low carbon steel back (thickness 1.2 mm), bronze alloy (CuSn8P, thickness 2.0 mm), PTFE+Pb mixed coating (thickness 0.08 mm), single weight approximately 0.42 kg, working pressure ≤25 MPa, working temperature -30℃ to +120℃, lubrication method: self-lubricating (can be replenished with lithium-based grease), design life ≥8000 hours (normal operating conditions)

Key Dimensions
Inner diameter 50.8 mm (2 inches, tolerance 0/-0.015 mm), outer diameter 63.5 mm (2.5 inches, tolerance 0/+0.02 mm), total length 76.2 mm (3 inches, tolerance 0/-0.1 mm), wall thickness 6.35 mm diameter, inner hole surface roughness Ra≤0.4 μm, outer circle cylindricity≤0.01 mm, end face perpendicularity≤0.01 mm
Compatible Models and Parts: Compatible with Cat 320D2 and 336D2 excavators (boom pin bushing), 966M loader (rocker arm connecting rod bushing), and 420F2 loader (steering cylinder pin bushing). Matching parts include 366-9274 retaining ring, 366-9275 dust seal, M16×80 bolt, and flat washer (16 mm).
Performance Parameters: Radial rated dynamic load 180 kN, radial rated static load 220 kN, allowable linear velocity ≤2.0 m/s, coefficient of friction ≤0.08 (dry friction) / ≤0.04 (grease lubrication), wear resistance coefficient ≤0.001 mm³/(N・m), limiting speed 500 rpm. RPM

Structural and Performance Advantages
Three-layer composite structure (steel back + bronze + PTFE): The steel back ensures strength and rigidity, the bronze layer bears load and stores oil, and the PTFE coating reduces friction, suitable for oil-free/low-oil operating conditions, reducing maintenance frequency.

Straight design adapts to cylindrical pins, facilitating installation and accommodating various shaft diameters and lengths. Its self-lubricating properties make it suitable for hard-to-lubricate areas, improving equipment reliability.

The bronze layer possesses good thermal conductivity and impact resistance, absorbing vibration and adapting to the frequent start-stop and load fluctuation conditions of engineering machinery, reducing the risk of wear on pins and bushings.

Installation and Maintenance Points
Before installation, clean the pin and bearing housing bore, checking for burrs and rust. Measure the housing bore diameter (63.5 mm) and bushing outer diameter, ensuring an interference fit of 0.015-0.025 mm. Use a press-fit method (pressure ≤50 kN) to avoid damaging the self-lubricating layer with impacts.

After installation, check that the bushing end face is flush with the seat hole, and the clearance between the inner hole and the pin is 0.03-0.05 mm to ensure smooth operation. Install the retaining ring and dustproof ring to prevent foreign objects from entering.

Maintenance: Check the bushing wear every 1500 hours. If the wear of the inner hole exceeds 0.2 mm, replace it immediately. For self-lubricating types, add a small amount of lithium-based grease every 2000 hours to extend service life.