CAT 523-3711 80mm Inner Diameter Bushing

CAT 523-3711 is a Caterpillar genuine SEM series composite bearing bushing, suitable for the suspension and steering systems of heavy loaders and graders, used for swing support and load damping in joint areas. The following is raw data only, without replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 523-3711, Type: Composite Bearing Bushing, Material: Carbon Steel Matrix + Composite Bearing Material, Single Weight: 3.2 kg, Operating Temperature: -30℃ to +110℃, Rated Static Load: 420 kN, Rated Dynamic Load: 190 kN, Fitting Clearance: 0.08-0.15 mm, Lubrication Method: Grease Lubrication, Fitting Oscillation Frequency: ≤1.0 Hz

Key Dimensions (Metric/Imperial): Inner Diameter: 80 mm (3.15 in), Outer Diameter: 95 mm (3.74 in), Overall Length: 60 mm (2.36 in), Wall Thickness: 7.5 mm (0.30 in), Flange Diameter: 105 mm (4.13 in), Flange Thickness: 6 mm (0.24 in), Fit Tolerance: H7/h6, Surface Roughness: Ra≤0.08 μm

Performance Parameters Matrix Hardness: HB 240-280mm, composite material layer thickness 1.0-1.4mm, friction coefficient ≤0.07 (grease lubrication), compressive strength ≥280 MPa, wear rate of wear-resistant layer ≤0.02 mm/1000h, no sealing structure, compatible system working pressure ≤18 MPa.

Structure and Compatibility Characteristics

Composite Structure: The carbon steel matrix ensures high load-bearing strength. The composite bearing material layer contains solid lubricant, suitable for oscillating conditions such as steering knuckles and rocker arms, reducing friction and impact, and minimizing joint noise and jamming.

Flange Positioning: The flange structure achieves reliable axial positioning, preventing bushing movement within the mounting hole, suitable for frequent oscillation under heavy load conditions, ensuring assembly stability and component lifespan.

Self-Lubricating Compatibility: The composite material layer can store grease, suitable for dusty and vibrating environments in construction machinery, reducing lubrication maintenance frequency and improving the reliability of joint components.

Compatible Models and Application Scenarios

Loaders: 930M, 950M, 962M.

Graders: 140M, 160M, 160M3.

Application Scenarios: Steering knuckle bushings, suspension link bushings, frame swing joints; suitable for steering, lifting, and leveling movements in heavy-duty operations, ensuring overall machine control precision and work efficiency.

Installation and Maintenance Points (Original Data)

Installation: Clean the mounting holes and pins, ensuring no burrs or rust on the surface. Mounting hole tolerance H7, pin tolerance h6.

Cold installation method: Use a special press to evenly press in the bushings. Do not strike the flange face. Rear end face runout ≤0.05 mm.

Add NLGI 2 lithium-based grease. Perform a no-load swing test 5-8 times to ensure no jamming and normal clearance.

Maintenance: Check bushing clearance every 2000 hours. Replace immediately if clearance exceeds 0.4 mm.

Replenish grease every 500 hours. Clean the grease fitting to prevent contaminants from entering, suitable for dusty working conditions.