CAT 231-4780 Sleeve

CAT 231-4780 is a Caterpillar genuine high-carbon steel straight sleeve, suitable for pin positioning and bushing support in boom, stick, and other working devices. It enhances connection strength and reduces pin wear. The following is pure original data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 231-4780, Type: Straight Sleeve, Material: High Carbon Steel (4140 Steel), Surface Carburized and Quenched, Single Weight: 1.85 kg, Suitable for Medium and Heavy Load Conditions, Working Temperature: -40℃ to +120℃, Rated Bearing Pressure ≥200 MPa, Used for positioning and bushing support of connecting pins in booms, sticks, buckets, etc., limiting radial displacement of the pins, and bearing impact loads.

Key Dimensions (Metric/Imperial)
Inner Diameter: 65.0 mm (2.559 in, Tolerance 0/+0.02 mm), Outer Diameter: 80.0 mm (3.150 in, Tolerance 0/-0.02 mm), Total Length: 120.0 mm (4.724 in, Tolerance ±0.1 mm), Wall Thickness: 7.5 mm, Chamfered Ends: 1×45°, Clearance with Pin 0.05-0.08 mm, interference fit with mounting hole 0.03-0.05 mm

Performance Parameters: Hardness HRC 58-62 (surface), core hardness HB 280-320, tensile strength ≥1000 MPa, yield strength ≥800 MPa, fatigue life ≥5×10⁵ cycles, wear-resistant, impact-resistant, compatible with Cat universal lithium-based grease

Structure and Compatibility Characteristics

Material and Process Advantages: 4140 high-carbon steel, carburized and quenched, with high surface hardness and wear resistance, and a tough core with strong impact resistance, suitable for high-frequency impact and heavy-load conditions in engineering machinery, and not easily deformed or cracked after long-term use.

Straight flangeless structure: Suitable for narrow installation spaces, fixed in the mounting hole by interference fit, ensuring coaxiality with the pin, reducing vibration and noise, working in conjunction with the bushing, and extending the service life of the pin and hole.

Operating Condition Adaptability: Compatible with boom, stick, bucket, and other connecting parts of excavators, loaders, and other equipment; resistant to harsh environments such as dust and humidity; suitable for low-to-medium speed, heavy-load swinging conditions.

Installation and Maintenance Points (Original Data)

Installation: Clean the mounting holes and pins (free of oil and burrs); cold-press installation (pressure ≤250 kN); ensure the end face is flush with the mounting surface; ensure the pin rotates freely without jamming; control clearance and interference fit according to dimensional parameters.

Maintenance: Check lubrication and wear every 1500 hours; replace if radial clearance exceeds 0.2 mm; apply anti-rust oil for long-term storage; avoid contact with acids and alkalis to prevent surface oxidation.