Industrial Isuzu 4BG1 crankshaft for 4.3L diesel engines replaces OEM 1-12310-449-0 while ensuring high-torque stability in Hitachi and Sumitomo excavators. Factory direct wholesale pricing with global export support.
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The Isuzu 4BG1 engine crankshaft (OEM: 1-12310-449-0) is a high-tensile 42CrMo forged component optimized for heavy-duty construction machinery.
It provides a precision-engineered foundation for Hitachi EX120, ZX135, and JCB JS200 excavators, specifically designed to match the vibration dampening requirements of turbocharged 4BG1T industrial configurations.
Bulk wholesale stock ready for immediate international shipping.
Revitalize your heavy machinery and construction fleet with a high-performance replacement Isuzu 4BG1 Crankshaft. As the central rotating assembly for the widely used 4.3L 4BG1 and turbocharged 4BG1T industrial diesel engines, this component is the definitive solution for engines facing downtime due to fracture, journal wear, or high-hour fatigue. Installing this durable engine shaft ensures your excavators, forklifts, and generators return to peak operational efficiency.
This crankshaft is manufactured to uphold Isuzu’s standing for “Diesel Powertrain Expertise” in the industrial sector. We utilize a high-tensile forged steel construction, precision-machined and hardened to withstand the rigorous duty cycles of construction and material handling applications. It is the trusted choice for a vast array of machinery, including Hitachi Zaxis excavators, TCM heavy-duty forklifts, and various power units, providing a robust and cost-effective alternative to OEM components.
| Technical Parameter | Detailed Specification |
|---|---|
| Engine Series | Isuzu 4BG1, 4BG1T, 4BG1-TAB, 4BG1-TC |
| OEM Part Number | 1-12310-449-0 / 1-12310-449-2 / 8-97358-144-1 |
| Material / Process | Forged Steel 42CrMo | Induction Hardened |
| Surface Hardness | HRC 55-62 (Journal and Fillet areas) |
| Excavator Models | Hitachi EX120-5, EX135, ZX120, ZX135, JCB JS200 |
| Industrial Applications | Sumitomo SH120, Case Excavators, Denyo Generators |
Ruich Value is your global partner for a comprehensive range of Isuzu industrial diesel engine crankshafts. From the 4B series to the larger 6B and 6H series, we supply the durable core components required for heavy machinery maintenance.
Category coverage: Isuzu 6BG1 & 6HK1 Excavator Cranks; 4BD1 & 4JB1 Industrial Shafts; 6BD1 Construction Engine Crankshafts.
| Model | Model | Model | Model |
|---|---|---|---|
| 4HF1 | 4BG1 | 4ZD1 | 6BG1 |
| 4HG1T | 4FC1 | 4ZA1 | 6HE1 |
| 4HK1 | 4JA1 | 4ZB1 | 6HK1 |
| 4HE1T | 4JB1/4JB1T | 4BD1 | 6SD1 |
| 4BA1 | 4DA1 | 4JJ1 | 6WA1 |
| 4BC2 (DB33) | DH100 | G161 | 6WG1 |
| 4JG1 | C223 | 6BB1 (NEW) | 6HH1 |
| 4JG2 | C240 | 6BB1 (OLD) | 6QA1 |
| C190 | 600P | DB58 | 10PC1 |
| 4BB1A | 4ZE1 | 6BF1 | 10PB1 |
| 6BD1 | 10PE1 | 4BE1 | 12PD1 |
| 6SA1 | 10PD1 | 12PC1 |
Customized/billet crankshaft development based on drawings or samples is also possible.
Q1: Is this crankshaft compatible with the Hitachi EX120-5 engine?
A: Yes, part number 1-12310-449-0 is the standard OEM reference for the Isuzu 4BG1 engine used in Hitachi EX120-5 and ZX120 excavators. Our forged steel version is designed to handle the hydraulic load fluctuations typical of these Hitachi models.
Q2: What are the main bearing torque specifications for the 4BG1 engine?
A: For a reliable 4BG1 rebuild, the main bearing cap bolts must be torqued to 167 Nm (123 lb.ft). Always follow a spiral sequence starting from the center journal to ensure the crankshaft rotates without binding.
Q3: How does the forged 4BG1T crankshaft handle vibration differently than cast versions?
A: The 4BG1T (turbocharged) version generates significantly more torsional vibration. Our forged 42CrMo crankshaft has a higher elastic modulus, which allows it to absorb these vibrations without developing the fillet cracks commonly seen in lower-quality cast iron units.
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