Komatsu PC160-7K PC160LC-7K Hydraulic Bucket Cylinder 21K-70-73110 116mm Bore 1240mm Stroke Aftermarket
This reliable aftermarket hydraulic bucket cylinder is precision manufactured as a direct OEM replacement for Komatsu PC160-7K standard track and PC160LC-7K long-track medium excavators. As the core hydraulic execution component of front working attachment, it drives bucket digging, soil grabbing, stone loading and material dumping operations. Widely suitable for municipal reconstruction, road maintenance, pipeline laying, landscaping and small quarry earthmoving projects.
All cylinders are strictly produced in accordance with Komatsu original technical drawings and OEM standards, with fully consistent mounting dimensions, pin hole spacing and hydraulic port layout. Direct bolt-on installation can be finished on site without cutting, welding or any secondary modification work.
| Item | Specification |
|---|---|
| Product Name | Hydraulic Bucket Cylinder |
| Applicable Model | Komatsu PC160-7K, PC160LC-7K Excavator |
| OEM Part Number | 21K-70-73110 |
| Product Grade | Brand New High-Grade Aftermarket |
| Warranty | 12 months against manufacturing defects |
| MOQ | 1 unit, sufficient stock for immediate delivery |
| QC Standard | ISO9001 certified, full hydraulic pressure test & cyclic fatigue test before shipment |
| # | Part No. | Description | Qty |
|---|---|---|---|
| 1 | 21K-70-73110 | LINK,L.H | 1 |
| 2 | 21K-70-72240 | Bushing | 1 |
| 3 | 20Y-70-32361 | Bushing | 2 |
| 4 | 20Y-70-23220 | SEAL,DUST (KIT) | 4 |
| 5 | 21K-70-73120 | LINK,R.H | 1 |
| 6 | 21K-70-72240 | Bushing | 1 |
| 7 | 20Y-70-32361 | Bushing | 2 |
| 8 | 20Y-70-23220 | SEAL,DUST (KIT) | 4 |
| 9 | 07020-00000 | FITTING, GREASE - UPPER HINGE PIN | 4 |
| 10 | 21K-70-23130 | Spacer | 1 |
| 11 | 21K-70-23210 | LINK | 1 |
| 12 | 21K-70-73130 | LINK,R.H | 1 |
| 13 | 21K-70-23191 | Pin | 1 |
| 13 | 21K-70-23190 | Pin | 1 |
| 14 | 01019-11640 | Bolt | 1 |
| 15 | 01580-11613 | NUT,(FOR ADJUSTABLE ROD) | 2 |
| 16 | 21K-70-71440 | Spacer | 4 |
| 17 | 21K-70-71490 | Spacer | 2 |
| 18 | 21K-70-23140 | Pin | 1 |
| 19 | 01011-81660 | Bolt | 1 |
| 20 | 01580-11613 | NUT,(FOR ADJUSTABLE ROD) | 2 |
| 21 | 21K-70-23140 | Pin | 1 |
| 22 | 01011-81690 | Bolt | 1 |
| 23 | 01580-11613 | NUT,(FOR ADJUSTABLE ROD) | 2 |
| 24 | 21K-70-23220 | Pin | 1 |
| 25 | 01019-11640 | Bolt | 1 |
| 26 | 01580-11613 | NUT,(FOR ADJUSTABLE ROD) | 2 |
| 27 | 20Y-70-31380 | SPACER? 1.0MM | 2 |
| 28 | 20Y-70-31390 | SPACER? 2.0MM | 1 |
| 29 | 07020-00000 | FITTING, GREASE - UPPER HINGE PIN | 1 |
| Spec Item | Data |
|---|---|
| Bore Diameter | 116mm |
| Piston Rod Diameter | 76mm |
| Working Stroke | 1240mm |
| 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-deformation performance |
| Matching Seal Kit PN | 21K-70-73110K |
| Working Temperature | -25℃ ~ +85℃ |
| Structure Feature | Double reinforced ear lugs with quenched copper wear bushings, built-in buffer device to reduce reciprocating impact and noise |
- Dual Model Universal Fitment
One cylinder fits both standard-track PC160-7K and long-track PC160LC-7K. All assembly sizes, lug spacing and oil port positions fully match original PN 21K-70-73110 cylinder, seamlessly connecting bucket linkages and hydraulic pipelines to guarantee stable continuous medium-load construction operation.
- Medium-Load Reinforced Optimized Structure
Thickened cylinder barrel and joint lugs are upgraded for frequent daily construction scenarios, resisting long-term cyclic loads and minor collision abrasion to extend overall 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 repair shops, equipment rental companies 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 and Latin American markets.
Our factory has over 10 years of mature experience in R&D and mass production of hydraulic cylinders for classic Komatsu PC medium excavator series including PC160-7K/PC160LC-7K. 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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