Description
CAT 143-3500 Inlet Cone
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The CAT 143-3500 is a Caterpillar original tapered inlet (tapered bushing/tapered sleeve), suitable for articulated pins and light-to-medium load swing parts of small and medium-sized excavators and loaders. It achieves a tapered interference fit, ensuring stable assembly and precise positioning. The following are the key details.
Core Technical Parameters
Item Details
Part Model: CAT 143-3500 (Single Conical Surface, Keyless, with Axial Lubrication Groove)
Material: Base 4140 Chromium-Molybdenum Steel, Conical Surface Struck (HRC 58-62), Hardened Layer Thickness 0.6-1.0 mm, Suitable for -40℃ to +120℃ Operating Conditions, Compatible with Oil/Grease Lubrication
Key Dimensions: Large End Inner Diameter 35 mm (1.378 in), Small End Inner Diameter 34.2 mm (1.346 in), Outer Diameter 42 mm (1.654 in), Length 32 mm (1.260 in), Taper 1:50, Chamfer 0.8 mm
Unit Weight: Approx. 0.062 kg (0.137 lbs)
Tolerances and Fits: Conical Surface Tolerance AT3, Outer Diameter Tolerance g6 (0/-0.016 mm), Recommended Interference Fit with Conical Hole 0.015-0.03 mm
Load Capacity: Radial rated load 48 kN, static allowable load 70 kN, coefficient of friction 0.09-0.12 (grease lubrication)
Structure and Core Functions
Precise Positioning: 1:50 taper design; radial interference is generated through axial pressing during installation, achieving zero-backlash positioning between the pin and the mounting hole, suitable for hinged parts requiring precise coaxiality.
Wear-Resistant and Durable: 4140 steel base with a surface hardened layer; strong wear resistance, suitable for the repeated swinging friction conditions of booms, sticks, and other hinged points.
Efficient Lubrication: Axial lubrication grooves in the inner hole ensure even distribution of grease, reducing dry friction, suitable for intermittently operating hinged parts, and extending the life of pins and bearings.
Easy Assembly: Thin-walled tapered structure allows for cold press-fitting without complex tooling, suitable for batch maintenance scenarios, reducing assembly time.
Compatible Models and Application Scenarios
Compatible Equipment: CAT 303.5E2/304E2 mini excavators, 903M/904M mini loaders, 416F backhoe loaders, etc.
Core Applications: Used for boom pin bushings, stick cylinder lug bushings, connecting rod hinge points, steering mechanism pivots, etc., providing radial support and precise positioning, suitable for light to medium loads and low to medium speed swing conditions.
Installation and Maintenance Points
Installation: Clean the mounting holes and tapered sleeve surface, ensuring no burrs or scratches; use a dedicated tapered indenter to apply a uniform pressure of 5-8 kN, avoiding striking the end face to prevent damage to the hardened layer.
After installation, the coaxiality should be ≤ 0.05 mm, ensuring a tight fit between the tapered surfaces without looseness.
Maintenance
Lubrication: Add NLGI Grade 2 lithium-based grease every 300-500 hours, until overflowing; for oil lubrication, use CAT HYDO 10 hydraulic oil.
Inspection: Regularly monitor the clearance. If it exceeds 0.10 mm or abnormal noise occurs, replace the tapered sleeve immediately and check the wear of the pin.
