CAT 7U-0390 295.78mm Flanged Sleeve Bearing

CAT 7U-0390 is a Caterpillar genuine straight bronze bushing used in the boom, stick hinge points, and cylinder lugs of loaders, excavators, and other equipment. The following is the original data and does not include information on replacement parts.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 7U-0390, Material CuSn8P Tin Bronze, Single Weight 0.68 kg, Suitable for low-speed heavy-load, swing/rotation conditions, Operating Temperature -30℃ to +120℃, Rated Dynamic Load ≥150 kN, Rated Static Load ≥280 kN, Suitable Shaft Diameter φ70 mm, Used for boom hinge, stick cylinder lug, connecting rod joint

Key Dimensions (Metric/Imperial)
Inner Diameter 70.0 mm (2.756 in, Tolerance 0/-0.02 mm), Outer Diameter 90.0 mm (3.543 in, Tolerance 0/-0.03 mm), Overall Length 80.0 mm (3.150 in, Tolerance ±0.12 mm), Wall Thickness 10.0 mm, Inner Hole Roughness Ra≤0.4 μm, Interference with Shaft 0.012-0.022 mm, clearance with mounting hole 0.01-0.02 mm

Performance Parameters: Hardness HB 85-105, coefficient of friction ≤0.10 (oil lubrication), limiting speed 1000 rpm (oil lubrication), allowable radial load ≤120 kN, compatible with Cat DEO-ULS 15W-40 engine oil, impact resistant, corrosion resistant, no angular misalignment capability

Structure and Compatibility Characteristics

Bronze Material Advantages: CuSn8P bronze has excellent friction reduction and wear resistance, can operate stably under low speed and heavy load with oil lubrication, suitable for impact loads and dusty environments in engineering machinery, not prone to seizing or wear.

Straight cylinder without flange structure: Fixed in the mounting hole by interference fit, ensuring the coaxiality of the hinge point, reducing vibration and clearance, suitable for frequently swinging parts such as boom and stick, long-term use deformation ≤0.03 mm.

Operating Conditions Adaptability: Suitable for frequent start-stop and oscillation/rotational operating conditions in construction machinery; oil-resistant and anti-aging; suitable for dusty and humid environments; compatible with Cat universal lithium-based grease.

Installation and Maintenance Points (Original Data)

Installation: Clean the journal and mounting hole (free of oil and burrs); cold press installation (pressure ≤120 kN); ensure the end face is flush with the mounting surface; ensure the shaft rotates/oscillates freely without jamming; control the interference fit and clearance according to the dimensional parameters.

Maintenance: Check lubrication and clearance every 1200 hours; replace if radial clearance exceeds 0.2 mm; for long-term storage, apply anti-rust oil and seal to prevent bronze oxidation.