Ensure your industrial machinery operates at peak performance with the high-precision 128300-77920 (also searched as 12830077920) crankshaft main bearing. Specifically engineered for Yanmar 3TNE88 and 4TNE88 diesel engines, this component is the preferred choice for heavy-duty repair shops and maintenance professionals worldwide.
If you are managing a fleet of excavators, tractors, or generators powered by Yanmar, the quality of your internal engine parts determines your downtime. This 128300-77920 Replacement offers an OEM-standard fit, ensuring that your crankshaft maintains perfect alignment and reduces friction during high-load operations.
| Field | Product Details |
|---|---|
| Model NO. | Yanmar 3TNE88, 4TNE88, 4TNE84, TK486 |
| Product Name | Crankshaft Main Bearing / Thrust Plate |
| Part Number | 128300-77920 (Alternate: 12830077920) |
| Type | Internal Engine Component / Bearing Shell |
| Condition | Brand New, OEM Standard Replacement |
| MOQ | 1 Piece |
| Stock Status | In Stock / Fast Dispatch Within 24 Hours |
| Application | Engine rebuild, overhaul, preventative maintenance |
| Payment Terms | T/T, Western Union, MoneyGram |
| Delivery Methods | Express (DHL, Fedex, EMS, UPS), Air, or Sea Freight |
Before purchasing, understand why our 128300-77920 supplier solution stands out against generic aftermarket alternatives.
| Core Purchasing Factors | Our OEM-Standard Replacement | Standard Aftermarket Bearing |
|---|---|---|
| 1. Material Composition | High-strength Tri-metal Alloy | Basic Aluminum Lining |
| 2. Heat Resistance | Up to 300C with anti-seize coating | Limited thermal stability |
| 3. Precision Tolerance | Strictly within 0.005mm deviation | Varying thickness issues |
| 4. Fatigue Strength | Reinforced for heavy-duty excavation | Prone to premature flaking |
| 5. Compatibility | Guaranteed fit for 3TNE88 / 4TNE88 | Generic sizing may cause oil gaps |
| 6. Lifespan | 8,000+ hours under normal maintenance | Unpredictable failure rate |
Not sure how this issue affects your equipment? Our team helps operators:
✔ Identify potential risks such as oil pressure drops and unusual engine knocking.
✔ Recommend suitable replacement parts based on your specific engine serial number.
✔ Support both inspection advice and global parts supply for urgent repairs.
Prevent catastrophic engine failure by replacing worn bearings early. Avoid the high cost of a snapped crankshaft or damaged engine block.
1. What are the signs of a failing 128300-77920 bearing in a 4TNE88 engine?
Common symptoms include low oil pressure warnings when the engine is warm and a distinct deep metallic "thumping" sound from the lower engine block. If you see copper flakes in your oil filter, immediate replacement of the 12830077920 is required.
2. Can I use 128300-77920 for other Yanmar models?
While primarily designed for the 88mm bore series (3TNE88, 4TNE88), it is also compatible with certain TK486 and 4TNE84 configurations. Always verify your specific engine build list with our technical team before installation.
3. Why Choose This 128300-77920 Product Name?
Our bearings utilize an OEM-standard tri-metal structure. They are trusted by repair shops and equipment fleets globally for their ability to withstand the extreme pressures of industrial diesel cycles.
We specialize in comprehensive engine solutions for world-leading brands. Whether you are performing a minor service or a complete engine overhaul, we provide the reliable components you need.
Major Brands Supported: Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, Weichai.
Our inventory includes: Engine Assembly, Cylinder Liners, Pistons, Piston Rings, Main Bearings, Connecting Rod Bearings, Thrust Washers, Full Overhaul Gasket Kits, Fuel Injection Pumps, Injectors, Crankshafts, Turbochargers, Water Pumps, Oil Pumps, Cylinder Blocks, Cylinder Heads, and Connecting Rods.
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