Komatsu PC150 PC150-1 Hydraulic Arm Cylinder 21K-63-66301 108mm Bore Aftermarket

This high-performance aftermarket hydraulic stick cylinder is precision manufactured as a direct OEM replacement for early Komatsu PC150 base model and PC150-1 medium excavators. As the core hydraulic drive component of front working equipment, it controls arm extension and retraction to finish digging, grabbing, loading and site leveling tasks. Widely used in municipal works, road maintenance, landscaping, pipeline laying and light earthmoving projects.

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

1. Compatible with PC150 & PC150-1 Old Excavators
   One cylinder fits both standard PC150 and PC150-1 early generation machines. All assembly sizes, lug spacing and oil port positions fully match original part 21K-63-66301, seamlessly connecting arm linkages and hydraulic hoses for stable continuous medium-load operation.
2. Medium-Load Reinforced Structure for Old Equipment Refit
   Thickened cylinder tube and integrated lug plates are optimized for frequent daily construction and minor quarry operations, resisting long-term cyclic dynamic loads and accidental collisions to extend service life significantly.
3. Multi-Round Strict Pre-Delivery Inspection
   Every finished cylinder passes full-stroke reciprocating cycle test and high-pressure airtight leak inspection, completely eliminating internal & external oil leakage hidden faults.
4. Superior Cost Performance
   Equivalent stability and service life as genuine Komatsu OEM spare parts, greatly lowering repeated purchasing costs for repair shops, machinery rental fleets and dealers focusing on vintage excavator spare parts.
5. Flexible Global Logistics Support
   In-stock goods can be dispatched within 3 working days. Air freight supports emergency breakdown orders; sea bulk shipment provides low-cost wholesale solution for Africa, Southeast Asia, Middle East and Latin American markets.

Our factory owns more than 10 years of mature experience in R&D and production of hydraulic cylinders for classic old-type Komatsu PC series excavators including PC150 / PC150-1. We supply complete boom, arm and bucket cylinder assemblies with mature forging, precision honing and professional heat treatment technology, supported by full-process strict quality control. Our aftermarket hydraulic cylinders are exported worldwide all year round, gaining long-term trust and consistent positive feedback from global machinery spare parts distributors.