Description
CAT 308-9809 Straight Sleeve Bearing
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The CAT 308-9809 YM sleeve bearing is a Caterpillar general-purpose powder metallurgy self-lubricating straight sleeve bearing, suitable for low-to-medium speed, medium-to-heavy load articulated parts in engineering machinery. It features self-lubrication and misalignment compensation capabilities. The following is pure raw data and does not include replacement parts information.
Core Technical Parameters (Raw Data)
Item Details
Basic Attributes Model 308-9809, Type YM Straight Sleeve Bearing (Self-Lubricating), Material Powder Metallurgy Alloy Steel, Single Weight 0.62 kg (1.37 lbs), Operating Temperature -40℃ to +120℃, Suitable Radial Load ≤95 kN, Suitable Shaft Diameter 41.28 mm, Fit Tolerance H7, Corrosion Resistance ≥120 hours Salt Spray, Surface Treatment Carburizing and Quenching, Hardness HRC 58-62, Elastic Modulus 207 GPa, Coefficient of Thermal Expansion 11.8×10^-6/℃, Suitable Clearance 0.020-0.045 mm
Key Dimensions (Metric / Imperial) Inner Diameter 41.28 mm (1.625 in), Outer Diameter 53.98 mm (2.125 in), Length 50.8 mm (2.000 in), Wall Thickness 6.35 mm, chamfer C1.5 mm, flatness ≤0.02 mm, surface roughness Ra≤0.8 μm, inner diameter tolerance +0.010/-0.005 mm, outer diameter tolerance +0.015/-0.010 mm, length tolerance +0.10/-0.05 mm, roundness ≤0.015 mm
Performance parameters: coefficient of friction ≤0.05 (dry state), porosity 18-22%, oil content ≥15%, compressive strength ≥1350 MPa, shear strength ≥520 MPa, fatigue limit ≥400 MPa (10^7 cycles), assembly interference 0.012-0.022 mm, maximum applicable speed 1800 rpm rpm, angular deviation compensation ≤2°
Structure and Adaptability Characteristics
Powder Metallurgy Self-Lubricating Structure: The porous matrix contains lubricating oil, providing continuous oil supply without additional lubrication. Suitable for low-speed oscillation and impact conditions in the articulation parts of construction machinery, reducing maintenance frequency and friction loss.
Universal Straight Sleeve Design: Flangeless straight cylinder structure with uniform wall thickness, adaptable to various mounting bases. It compensates for installation coaxiality errors and slight shaft deflection, reducing local stress concentration and improving component operational stability.
Universal Adaptability: Suitable for articulation parts such as connecting rods, rocker arms, and steering knuckles in Caterpillar mini loaders, excavators, graders, etc., suitable for frequent oscillation and medium load conditions. Easy installation, no additional lubrication system required.
Compatible Models and Application Scenarios
Loaders: Boom connecting rods and steering rocker arm articulation parts of models such as 906H and 908H, suitable for frequent loading and unloading of lightly loaded materials, ensuring flexible operation of steering and working devices.
Excavators: The boom linkage and boom support hinges of models 305.5E2 and 306E2 are adapted for medium-to-heavy load and oscillating conditions in small excavator operations, improving the reliability of the working device.
Others: Adapted to the working device hinges of some Caterpillar mini graders and skid steer loaders, meeting the needs of medium-to-high intensity operations in harsh conditions.
