CAT 116-7478 SLEEVE-WEAR

CAT 116-7478 is a Caterpillar original straight integral steel wear-resistant bushing (fitted for excavator booms, stick pins, and loader boom linkages, used for radial support and wear protection in low-speed, heavy-load conditions). The following is the original data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 116-7478, Type: Straight, Oil-Groove-Free Integral Wear-Resistant Sleeve, Material: 42CrMo Alloy Steel (Quenched and Tempered + Nitrided), Single Weight: 0.98 kg, Operating Temperature: -40℃ to +120℃, Compatible with Lithium-Based Grease (NLGI 2), Grease Lubrication, Limiting Speed: 1100 rpm (Grease Lubrication), Surface Nitrided + Polished, No Seal, Rated Radial Load: 105 kN, Rated Static Load: 150 kN, Fatigue Life: ≥9000 hours, Coefficient of Friction: μ≤0.008Cat® Parts
Key Dimensions Inner Diameter: 75 mm (2.953 in), Outer Diameter: 90 mm (3.543 in), Length: 55 mm (2.165 in), Wall Thickness: 7.5 mm, Chamfer at Both Ends: r2 mm, Inner Diameter Tolerance: +0.018/-0 mm, Outer Diameter Tolerance: 0/-0.012 mm, length tolerance ±0.10 mm, surface roughness Ra 0.1 μm, nitriding layer thickness 0.06-0.09 mm, hardness HRC 58-62 Cat® Parts
Compatible Models and Parts: Compatible with Cat 320D2/323D2 excavator boom pins and 950M loader boom linkage pins. One piece per pin, bearing pure radial load, limiting radial runout of the pin, ensuring transmission accuracy and component stability.

Performance Parameters: Radial clearance 0.012-0.020 mm, impact load capacity ≥180 kN, wear resistance ≥5500 hours (normal lubrication), suitable for mineral oil/synthetic hydraulic oil environments, pin mating accuracy H7/h6

Structural and Performance Advantages:
42CrMo alloy steel material: quenched, tempered, and nitrided, possessing high hardness, wear resistance, and impact resistance, suitable for harsh working conditions in engineering machinery.

Integrated oil-free groove design: High structural rigidity, uniform load distribution, avoiding premature damage caused by localized stress concentration, and compatible with centralized grease lubrication systems.

Nitrided polished surface: Reduces the coefficient of friction, minimizes pin wear, improves fitting accuracy and rotational smoothness, and extends service life.

Installation and Maintenance Points (Original Data)

Installation: Clean the wear-resistant sleeve and mounting base. Install using the press-fit method (pressure ≤90 kN), ensuring flush end faces. After installation, radial runout ≤0.010 mm. Welding or heat fitting is prohibited to prevent changes in material properties.

Maintenance: Replenish grease every 500 hours, filling the wear-resistant sleeve to 1/3-1/2 of its volume. Check wear every 2000 hours. Normal use is achieved when inner diameter wear is ≤0.10 mm; replace if exceeding this limit.

Troubleshooting: For rotational jamming, check grease level and cleanliness; for abnormal noise, check fit clearance; for excessive wear, check material hardness and installation accuracy, and replace or repair relevant components promptly.