If you are managing a fleet or operating a workshop, finding reliable engine components for the 4D95 series is critical for avoiding unplanned downtime. The 6204-31-2121 (also searched as 6204312121) is a precision-engineered piston designed for the Komatsu 4D95, 4D95L, and S4D95 diesel engines. These pistons are essential for maintaining high thermal efficiency and compression ratios in heavy-duty excavators and industrial equipment.
Our inventory focuses on OEM standard replacements that meet or exceed original equipment specifications, ensuring that your engine rebuild or maintenance project results in long-term operational stability.
| Detail Field | Specifications for 6204-31-2121 |
|---|---|
| Model NO. | 4D95 / 4D95L / S4D95 / S4D95L |
| Product Name | Diesel Engine Piston |
| Part Number | 6204-31-2121 / 6204312121 |
| Type | Piston Assembly (Standard Size) |
| Condition | Brand New, OEM Standard Replacement |
| Payment Terms | T/T, Western Union, MoneyGram |
| Delivery Methods | Express: DHL, Fedex, EMS, UPS or by Air/Sea |
| MOQ | 1 Piece |
| Stock Status | In Stock / Fast Dispatch within 24-48 hours |
| Packaging | Industrial Export Packing / Neutral Packing |
| Application | Engine rebuild, overhaul, maintenance |
Selecting a piston is not just about the price; it is about the alloy quality and dimensional accuracy. Below is a comparison between our premium replacements and standard aftermarket options.
| Core Features | Our 6204-31-2121 Piston | Low-Grade Aftermarket |
|---|---|---|
| 1. Material Composition | High-silicon aluminum alloy for heat resistance | Standard recycled aluminum (prone to cracking) |
| 2. Manufacturing Process | CNC Precision Machined to micron tolerances | Manual or low-precision casting |
| 3. Thermal Expansion | Controlled expansion for stable gap clearance | High expansion leading to cylinder scuffing |
| 4. Ring Groove Protection | Reinforced top ring land (selected models) | No reinforcement, leads to rapid wear |
| 5. Pin Hole Finish | Diamond-bored for smooth oscillation | Rough finish causing pin knocking |
| 6. Weight Balancing | Strict weight matching per set for low vibration | Random weights affecting engine balance |
The 6204-31-2121 piston is widely used across various construction and industrial applications. Ensure your machine model matches the 4D95 engine configuration:
| Equipment Type | Engine Model | Machine Model (Partial List) |
|---|---|---|
| Hydraulic Excavator | 4D95L-W-1 / S4D95L | PC60-5, PC60-6, PC75UU-1, PC75UU-2 |
| Wheel Loader | 4D95L | WA70-1, WA100-1 |
| Bulldozer | 4D95 | D20P-5, D21P-5 |
| Forklift / Generator | 4D95S / 4D95L | Various Industrial Models |
Our technical team helps operators solve complex engine problems before they become costly failures. We provide more than just parts; we provide solutions:
✔ Identify potential risks during maintenance (e.g., piston crown erosion or skirt wear)
✔ Recommend suitable replacement parts based on your specific engine serial number
✔ Support both inspection advice and professional parts supply for rapid repair
Contact our experts for immediate support:
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