261-1544 crankshaft for CAT C6.4 6.4L engine. Fits 320D and 323D excavators. Forged 42CrMo steel resists journal scoring. Workshop and fleet supply
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The Caterpillar 261-1544 crankshaft is a high-precision forged steel assembly designed for the C6.4 6.4L engine. Built with induction-hardened journals to prevent scoring, it fits CAT 320D and 323D excavators. In stock for the global workshop supply.
In heavy-duty earthmoving operations, the engine crankshaft is the structural core that translates combustion energy into massive hydraulic force. Ruich Value supplies the Caterpillar 261-1544 crankshaft, precision-forged to meet the rigorous QDR (Quality, Durability, and Reliability) standards required for the C6.4 ACERT platform. Machined from 42CrMo high-tensile forged steel, this rotating assembly is engineered to withstand the extreme torsional loads and continuous duty cycles of Caterpillar 320D and 323D excavator fleets.
Common bottom-end failures in industrial 6.4L engines often include crankshaft journal scoring and catastrophic bearing spin failure, usually resulting from hydraulic overload or contaminated engine oil. Our forged 42CrMo crankshaft utilizes advanced induction hardening on all main and rod journals. This process creates a reinforced wear layer that prevents surface fatigue and cracking in the critical journal fillets, ensuring your C6.4 engine crankshaft maintains its exact stroke geometry over thousands of operating hours.
Engine rebuilders require uncompromised accuracy to ensure proper oil film thickness. Every Caterpillar crankshaft we supply is CNC ground and micro-polished to an Ra 0.2 finish, guaranteeing perfectly smooth surfaces for main and connecting rod bearings. As a specialized provider of wholesale Caterpillar crankshaft solutions, we offer factory-direct support for fleet managers seeking to restore 320D machine power while avoiding the long lead times of traditional dealer networks.
| Parameter | Technical Value |
|---|---|
| Main Journal Diameter | 80.00 mm |
| Rod Journal Diameter | 64.00 mm |
| Stroke Length | 127.00 mm |
| Material Construction | 42CrMo Forged Alloy Steel |
| Journal Surface Finish | Micro-Polished (Ra 0.2) |
| Balancing | Dynamic VSR Balanced |
| Primary OEM | 261-1544 / 2611544 |
Our heavy-duty rotating assembly catalog covers the complete Caterpillar 300-series excavator family. Explore our complete Caterpillar Engine Parts Catalog for matching cylinder heads, crankshafts, and master rebuild kits.
| Engine Model | OEM Ref. Number | Material Spec | Primary Application (Famous Models) |
|---|---|---|---|
| S4K | 4W-3989 5I-7777 | Casting / Forging | Excavators: CAT E110B, E120B Loaders: CAT 910E |
| S4KT | 5I-7844 135-2419 | Forging (Rec.) | Excavators: CAT 312, 312B, 312C |
| S6K | 5I-7670 (Mitsu: 34320-10010) | Casting / Forging | Excavators: CAT E200B, 320, 320L Graders: 120B |
| S6KT / 3066 | 5I-7671 125-3005 205-0672 | Forging | Excavators: CAT 320B, 320C, 323C (The "Gold Standard" for 320 series) |
| C6.4 / 320D | 261-1544 294-1749 | Forging | Excavators: CAT 320D, 320D L, 323D |
| 3306 | 4N-7693 2W-7458 | Forging (OEM) | Dozers: CAT D6C, D6D, D7G Graders: 12G, 140G Trucks: Many International/Freightliner trucks |
| 3304 | 4N-7692 | Forging | CAT D4E, 951C, 955L, 120G (Same family as 3306) |
| 3204 | 1W-9002 / 7N-1300 | Casting/Forging | CAT D3, 931, 943, 953 (Smaller Engine) |
| C13 | 313-3997 243-2895 | Forging | Trucks: Kenworth T800, Peterbilt 379 Excavators: CAT 345C, 349D |
| C7 | 271-5658 224-3255 | Forging | Trucks: Ford F650/F750, GMC TopKick Loaders: CAT 950H, 962H Excavators: 324D, 325D |
| C9 | 282-7958 160-8199 212-8566 | Forging | Excavators: CAT 330C, 330D, 336D Dozers: CAT D6R, D6T |
| C15 | 221-9360 337-0201 IV-1606 | Forging | Trucks: King of the Road (Peterbilt 389, Kenworth W900) Dozers: CAT D8T Excavators: 365C, 385C |
| C18 | 222-3236 260-0677 | Forging | Generators: CAT C18 Gensets Loaders: CAT 988H Marine: CAT C18 Marine Propulsion |
| C4.2 | 238-3449 (Perkins 1104D base) | Casting / Forging | Excavators: CAT 312D, 314D, 315D |
| 3406E | 101-3228 4P-9055 | Forging | Trucks: 1990s Era Heavy Trucks Dozers: CAT D8R, D9R Loaders: 980G |
| Make | Machine Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Caterpillar | 320D / 320D L / 320D LN | 2006–2014 | CAT C6.4 | Excavator |
| Caterpillar | 323D / 323D L / 323D LN | 2006–2015 | CAT C6.4 | Excavator |
| Caterpillar | M322D Wheel Excavator | 2008–2015 | CAT C6.4 | Material Handling |
Journal scoring in the C6.4 engine is typically caused by debris bypassing the oil filter. Tiny abrasives scratch the journal surface, destroying the hydrodynamic oil film and leading to high friction. Replacing your worn assembly with our induction-hardened 261-1544 shaft restores the required surface hardness to resist future contamination damage.
Yes, they are 100% interchangeable. The 294-1749 is a later supersession part number issued by Caterpillar for the 320D/323D engine range. Both shafts feature the identical 127.0 mm stroke and 80 mm main journal diameter. Our unit satisfies the technical requirements for both original and updated Caterpillar arrangements.
The Ra 0.2 surface finish refers to the average roughness profile. A mirror-like finish is essential in high-pressure diesel systems to ensure the journal “floats” perfectly on a microscopic layer of oil. This prevents metal-on-metal contact during startup, which is when the majority of industrial engine wear occurs.
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Custom crankshaft manufacturing available based on samples or drawings.
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