Ensure your 4D120 series engine runs at peak efficiency with our premium 4D120-21 (4D12021) liner kit. Specifically designed for Komatsu heavy equipment, this kit provides the perfect seal and durability required for professional engine overhauls.
| Model NO. | Komatsu 4D120 / S4D120 | Part Number | 4D120-21 / 4D12021 |
| Product Name | Liner Kit (Four Matching) | Condition | New, OEM Standard |
| Application | Engine Rebuild / Maintenance | MOQ | 1 Piece |
| Delivery | DHL, Fedex, UPS, Air/Sea | Stock | Ready to Ship |
| Machine Type | Model | Engine Code |
|---|---|---|
| Excavator | PC100-3, PC120-3, PC150-3 | 4D120 / S4D120 |
| Wheel Loader | W70-1 | 4D120 |
| Purchase Focus | Standard Market Parts | Our OEM Replacement |
|---|---|---|
| Material | Basic Cast Iron | Alloyed Wear-Resistant Iron |
| Reliability | Moderate | Trusted by Fleet Operators |
| Fitment | May require adjustment | Precision Drop-in Fit |
Technical Support: Our team helps operators identify maintenance risks and recommends exact replacement parts for 4D12021 systems.
1. Why choose this 4D120-21 Liner Kit?
It uses an OEM-standard tri-metal structure, preferred by professional repair shops for its high heat resistance.
2. Common failure signs of 4D12021 parts?
Heavy oil consumption or blue smoke usually indicates the cylinder liner or piston rings need replacement.
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