CAT 6E-4383 39mm Outer Diameter Bushing

CAT 6E-4383 is a straight-tube steel bushing for Caterpillar construction machinery, with an inner diameter of 39mm. It is suitable for the boom, stick, connecting rod, and other hinge parts of excavators, loaders, and other equipment. It is used to reduce friction and wear between the pin and the frame, improve the load-bearing and wear resistance of the hinge parts, and is suitable for medium and heavy-duty, high-frequency oscillating conditions Cat® Parts. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 6E-4383, Type: Straight cylindrical oil-groove-free bushing (press-fit), Material: High carbon chromium alloy steel (20CrMnTi, quenching hardness HRC 58-62), Single weight: Approximately 0.56 kg, Operating temperature: -30℃ to +120℃, Design life: ≥8000 hours (normal working conditions), Suitable for heavy-duty, medium-speed oscillation (≤15 times/minute) conditions, Surface treatment: Carburizing and quenching + polishing, Corrosion resistance meets ISO 12944-5 standard

Key Dimensions
Inner diameter: 39 mm (tolerance 0/+0.010 mm), Outer diameter: 50 mm (tolerance 0/-0.015 mm), Total length: 45 mm (tolerance 0/-0.15 mm), Mounting chamfer: r1.5 mm, Wall thickness: 5.5 mm, Press-fit interference 0.015-0.025 mm (fitting with mounting holes), clearance with pin 0.010-0.020 mm
Compatible Models and Parts: Compatible with boom and stick hinges and connecting rod pins of Cat 320D and 323D excavators, 950H loaders, etc. Matching parts: 12-1982 pins (M10×1.5×45 mm), 5P-0960 extreme pressure lithium-based grease. Can be used in combination with 389-0698 retainers and 135-2443 sealing rings.
Performance Parameters: Rated load capacity ≥120 MPa, coefficient of friction ≤0.002 (under good lubrication conditions), wear layer thickness 0.8-1.2 mm, impact strength ≥80. J/cm², fatigue life ≥ 5 × 10⁵ cycles (rated load)

Structural and Performance Advantages: High-carbon chromium alloy steel material and carburizing and quenching treatment ensure the bushing has high hardness and wear resistance, suitable for heavy-load and frequent oscillation conditions in engineering machinery, reducing wear on the pin and bushing, and extending the service life of Cat® Parts.

Precise dimensional tolerances and press-fit interference design ensure a stable fit with the mounting hole, preventing bushing loosening. The reasonable clearance design with the pin ensures smooth oscillation and reduces frictional resistance.

The straight cylindrical structure is suitable for various hinged parts, easy to install, requires no complex lubrication system (regular grease application is sufficient), has low maintenance costs, and is suitable for harsh equipment conditions.

Installation and Maintenance Points: Before installation, clean the bushing, mounting hole, and pin, checking for burrs, rust, or deformation. Use a special press-fit tool to smoothly press the bushing into the mounting hole. Do not strike, as this may deform or crack the bushing.

After installation, add appropriate grease to ensure sufficient lubrication. Install the elastic retaining ring to fix the pin and prevent axial movement. Before operation, check whether the hinge joint swings smoothly and whether there are any abnormal noises.

Maintenance: Check the lubrication condition and bushing wear every 500 hours. If the clearance exceeds 0.05 mm or if scratches or peeling appear on the surface, replace immediately. When replacing, check the pin wear at the same time. If the pin diameter wear exceeds 0.03 mm, replace it simultaneously.