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Bucket Cylinder for Cat 6030 - 366-6579. Direct Replacement Fit: Built for Caterpillar 6030 bucket cylinder applications using OEM reference 366-6579 (3666579). Heavy-Duty Hydraulic Cylinder: Designed for demanding excavator service in mining and heavy equipment applications. Pressure-Tested Assembly: Each cylinder is inspected and tested before painting and packaging to verify performance. OEM-Compatible Aftermarket Supply: Supports Caterpillar equipment replacement needs without requiring original-brand sourcing. Warranty and Technical Support: Covered by Ariya warranty support with aftersales assistance available after delivery.