Komatsu PC300-6LE PC300LC-6LE Hydraulic Arm Cylinder 207-63-02521 143mm Bore 1520mm Stroke Aftermarket

This heavy-duty aftermarket hydraulic stick cylinder is precision manufactured as a direct OEM replacement for Komatsu PC300-6LE standard track and PC300LC-6LE long-track large excavators. As the core hydraulic driving component of front working equipment, it controls arm extension and retraction to finish heavy rock excavation, bulk material loading, mine site leveling and heavy earthmoving tasks. Widely used in open-pit mines, granite quarries, large highway projects and infrastructure construction.

All cylinders are strictly produced per Komatsu original technical drawings and OEM standards, with fully consistent mounting dimensions, pin hole spacing and hydraulic port layout. Direct bolt-on installation without cutting, welding or any on-site secondary modification.

1. Universal Fit for PC300-6LE & PC300LC-6LE

   One cylinder fits both standard track and long-track LC versions of PC300-6LE. All assembly sizes, lug spacing and oil port positions fully match original PN 207-63-02521 cylinder, seamlessly connecting arm linkages and hydraulic pipelines for stable long-hour heavy-load mining operation.

2. Mine-Grade Reinforced Heavy-Duty Structure

   Thickened cylinder tube and reinforced joint lugs are specially optimized for harsh mine and quarry environments, resisting long-term cyclic heavy loads, rock collision impacts and abrasion to greatly extend service life.

3. Multi-Round Strict Pre-Delivery Inspection

   Each finished cylinder undergoes repeated full-stroke reciprocating cycle test and high-pressure airtight leak detection, completely eliminating hidden internal and external oil leakage hazards.

4. Outstanding Cost Performance

   Delivers identical stability, strength and service lifespan as genuine Komatsu OEM spare parts, effectively cutting recurring procurement costs for mining repair shops, machinery rental fleets and global spare parts wholesalers.

5. Flexible Global Logistics Support

   In-stock items can be dispatched within 3 working days. Air freight supports urgent breakdown rush orders; sea freight provides cost-saving bulk wholesale shipping for Africa, Southeast Asia, Middle East and Latin American mining markets.

Our factory has over 10 years of professional experience in R&D and mass production of hydraulic cylinders for classic Komatsu large PC series excavators including PC300-6LE / PC300LC-6LE. We supply complete boom, arm and bucket cylinder assemblies with mature forging, honing and heat treatment craft, plus full-process strict quality control. Our aftermarket hydraulic cylinders are exported worldwide all year round, winning long-term trust and consistent positive feedback from global machinery spare parts dealers.

A: No. Each Komatsu excavator generation uses exclusive part numbers and unique structural dimensions without interchangeability. Please confirm your complete machine model before ordering.

A: Seal repair kit is not included in standard delivery. You can purchase the dedicated supporting seal kit separately, and we will offer a competitive combined order quotation.

A: Anti-rust oil filled into cylinder inner cavity, anti-rust grease evenly coated on piston rod surface. The whole cylinder wrapped with thick waterproof PE film and packed in reinforced thick export plywood cases to prevent collision, scratch and moisture damage during long sea transit.

A: Yes. Complete working device cylinder set orders enjoy graded volume discounts. Consolidated FCL container shipment service is available to reduce total logistics expenditure.

A: Please provide clear photos of leakage position plus your excavator serial number. We will arrange free seal replacement and professional remote troubleshooting guidance promptly.