Komatsu PC75UU-2 Hydraulic Boom Cylinder 21W-63-02151 Aftermarket 92mm Bore 1040mm Stroke
This high-strength aftermarket hydraulic boom cylinder is precision manufactured as a direct OEM replacement for Komatsu PC75UU-2 compact zero-tail mini excavator. As the core hydraulic power component of front working attachment, it controls boom lifting and lowering for excavation, pipeline construction, landscaping and light earthmoving jobs. Widely used in urban narrow construction sites, residential renovation and small municipal projects.
All cylinders are strictly produced following 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.
| Item | Specification |
|---|---|
| Product Name | Hydraulic Boom Cylinder |
| Applicable Model | Komatsu PC75UU-2 Mini Zero Tail Excavator |
| OEM Part Number | 21W-63-02151 |
| Product Grade | Brand New High-Quality Aftermarket |
| Warranty | 12 months against manufacturing defects |
| MOQ | 1 unit, sufficient stock for immediate shipment |
| QC Standard | ISO9001 certified, full hydraulic pressure & cyclic fatigue testing before delivery |
| # | Part No. | Description | Qty |
|---|---|---|---|
| G-1 | (21W-63-X2151) | CYLINDER GROUP,BUCKET | 1 |
| ---- | ---- | ==================== | |
| 1 | 21W-63-02151 | CYLINDER ASS'Y,BUCKET | 1 |
| 1 | 21W-63-76241 | Cylinder | 1 |
| 2 | 07144-10505 | Bushing | 1 |
| 3 | 07145-00050 | SEAL,(Y1620-41A0A-3) | 2 |
| 4 | 21W-63-76220 | ROD,PISTON | 1 |
| 5 | 07144-10606 | Bushing | 1 |
| 6 | 07145-00060 | SEAL,(Y1620-41A0A-14) | 2 |
| 7 | 07020-00000 | FITTING, GREASE - UPPER HINGE PIN | 2 |
| 8 | 707-29-90740 | HEAD,CYLINDER | 1 |
| 9 | 707-56-55510 | SEAL,DUST? CYLINDER HEAD | 1 |
| 10 | 07179-12069 | RING, SNAP | 1 |
| 11 | 07177-05530 | Bushing | 1 |
| 12 | 707-51-55211 | PACKING,(Y1620-41A0A-6) | 1 |
| 13 | 07000-02090 | O-RING,(DK029369-0020) (K2) | 1 |
| 14 | 07000-12085 | O-RING,(FOR SNOW REMOVING) | 1 |
| 15 | 07146-02086 | RING,(Y1620-41A0A-10) | 1 |
| 16 | 707-36-90240 | Piston | 1 |
| 17 | 707-44-90180 | RING,(Y1620-41A0A-17) | 1 |
| 18 | 07156-00912 | RING,(Y1620-41A0A-18) | 1 |
| 19 | 07165-13941 | NUT, NYLON | 1 |
| 20 | 21W-63-76271 | Tube | 1 |
| 21 | 21W-63-76281 | Tube | 1 |
| 22 | 01010-51020 | BOLT,(FOR QUICK SHIFT) (MITSUBISHI) | 2 |
| 23 | 01643-31032 | WASHER,(WITH AUTO EMERGENCY STEERING) | 2 |
| ---- | ==================== |
| Spec Item | Data |
|---|---|
| Bore Diameter | 92mm |
| Piston Rod Diameter | 62mm |
| Working Stroke | 1040mm |
| Rated Working Pressure | 31.4MPa |
| Factory Test Pressure | 47.1MPa (1.5 times rated working pressure) |
| Barrel Material | High-tensile seamless alloy steel with precision inner honing |
| Piston Rod | 40CrMo heat-treated steel, 28~32μm hard chrome plating, HRC68–72, excellent wear resistance & anti-bending performance |
| Matching Seal Kit PN | 21W-63-02151K |
| Working Temperature | -25℃ ~ +85℃ |
| Structure Feature | Compact reinforced ear lugs with quenched copper wear bushings, built-in buffer device to reduce reciprocating impact during tight-space operation |
- 100% Exact OEM Fit for PC75UU-2 Mini Excavator
All assembly sizes, lug spacing and oil port positions fully match original PN 21W-63-02151 cylinder, seamlessly connecting boom linkages and hydraulic pipelines for stable continuous light-medium load operation in narrow urban areas.
- Compact Reinforced Design for Zero-Tail Mini Machine
Thickened cylinder tube and reinforced small lug plates are customized for compact mini excavator frequent short-distance work, resisting minor collision abrasion and cyclic loads to extend service life effectively.
- Multi-Round Strict Pre-Delivery Inspection
Each finished cylinder undergoes full-stroke reciprocating cycle test and high-pressure airtight leak detection, completely eliminating hidden internal and external oil leakage risks.
- Excellent Cost Performance
Delivers the same stability and service lifespan as genuine Komatsu OEM spare parts, greatly cutting repeated procurement costs for mini excavator repair shops, small equipment rental fleets and global spare parts wholesalers.
- Flexible Global Logistics Support
In-stock items can be dispatched within 3 working days. Air freight handles urgent breakdown rush orders; sea freight offers cost-effective bulk wholesale shipping to Africa, Southeast Asia, Middle East markets.
Our factory has over 10 years of mature experience in R&D and mass production of hydraulic cylinders for Komatsu UU series compact zero-tail mini excavators including PC75UU-2. 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.
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