3801763 Cummins NT855 camshaft – Resists lobe spalling and torsional fatigue | Professional Supply. OEM quality steel ensures long-haul reliability Kenworth W900 and Komatsu D155. Request wholesale quote.
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Cummins NT855 Big Cam camshaft (OEM: 3801763) built with 58-62 HRC surface hardness.
Precision-ground lobes minimize friction, fitting equipment including Kenworth W900, Peterbilt 379, and Komatsu D155 machines.
Ready for wholesale supply.
As a foundational component in our wholesale Heavy Duty Diesel Engine Parts inventory, this Cummins NT855 Camshaft (Part No: 3801763) is engineered for the legendary 855 cubic inch series. Recognizing that the NT855 is the workhorse of global logistics and mining, our catalog depth ensures that fleet managers and distributors have immediate access to high-durability shafts that meet the specific timing requirements of Big Cam engines.
This replacement shaft addresses the critical wear issues in high-mileage engines, such as injector lobe flattening and journal scoring. Whether you are overhauling a classic Kenworth truck or servicing applications such as Komatsu bulldozers, heavy-duty gensets, and other heavy equipment, our camshaft provides the precise lift profile required for optimal combustion efficiency. It is a direct-fit solution that interchanges with OEM 3044767, 3047452, and 3801749.
| Specification | Value |
|---|---|
| Product Type | Camshaft |
| Material Grade | 42CrMo High-Carbon Alloy Steel |
| Manufacturing | CNC Precision Ground & Polished |
| Hardness Range | 58-62 HRC (Induction Hardened Lobes) |
| Surface Finish | Anti-Friction Surface Coating |
| Balancing Grade | Static Balanced |
| Heat Treatment | Deep Induction Hardening |
| OEM Reference | 3801763 |
| Cross Reference | 3044439, 30444390, 3066880 |
| Typical Applications | Kenworth W900, Peterbilt 379, Komatsu D155, Cummins C300 Genset |
| Application Category | Heavy-Duty Mining, Logistics & Power Generation |
Technician’s Note: The NT855 series has multiple camshaft variations depending on the CPL (Control Parts List). Before installing the 3801763, verify if your engine is a Big Cam I, II, III, or IV, as the injector cam lobe profiles differ significantly. Installing a Big Cam shaft in a Small Cam block (or vice versa) will result in incorrect injection timing and potential engine damage. Always replace the cam followers (rollers) when installing a new shaft.
| Engine Series | Application Field | Typical Equipment Models |
|---|---|---|
| NT855 / NTA855 | Heavy Truck |
|
| N855-C | Construction & Mining |
|
| NT855-G | Power Generation |
|
Our inventory extends far beyond the NT855 series, covering a comprehensive range of Heavy Duty Diesel Engine Parts for legacy and modern engines. We supply camshafts for the full Cummins lineup including mid-range and high-horsepower models.
Category coverage: Wholesale supply for Cummins 4BT, 6BT, 6CT, L10, M11, N14, K19, and K38 engines.
| Model | Main PN | Cro. Ref. PN | Engine Model | Application |
|---|---|---|---|---|
| V28 | 4073134 | 3070838, 3053525, 3801308, C3970366 | V28 Series (V12) | Heavy-duty Mining (Terex), Marine, Large Gensets |
| NH220 | 3801114 | 3044767, 3042568, 111888 | NH220 / NT855 Small Cam | Classic Heavy Trucks, Early Generators, Construction Machinery |
| V903 | 199180 | 3070838, 3053525 | V903 / VT903 Series | Agricultural Machinery, Drilling Rigs, Military |
| NT855 | 3801030 | 3044767, 3047452, 3801749 | NT855 Big Cam | Heavy-duty Trucks, Mining (Komatsu), Power Generation |
| 4BT | 3929039 | 3925582, 3929038, 3929885 | 4BT Series (3.9L) | Light Trucks, Skid Steer Loaders, Pumping Units |
| 6BT | 3949042 | 3929886, 3907824, 3914639, 3929041, 3283179 | 6BT Series (12-Valve) | Dodge Ram, Freightliner, Agricultural Tractors |
| 6CT | 3934168 | 3914640, 3923478, 3917882, 3929734, 3924471, 3356593 (Kit) | 6CT Series (8.3L) | City Buses, Construction Cranes, Graders |
| ISB6.7 | 3979506 | 3954099, 3976620, 3966431, 3966430 | ISB6.7 / QSB6.7 Series | School Buses (Blue Bird), Delivery Trucks (Paccar) |
| L10 | 3801110 | 3803528, 3049024, 3065891 | L10 Series | Vocational Trucks, Garbage Trucks, Transit Buses |
| M11 | 3803703 | 3084568, 3417765, 3804300 | M11 / ISM11 Series | Heavy-duty Fleet Trucks, Cement Mixers |
| N14 | 3803555 | 3066892, 3417766, 3803965 | N14 Select / Plus | Class 8 Over-the-Road Trucks (Peterbilt, Volvo) |
| K19 | 3066877 | 3066881, 3076767 | K19 / KTA19 Series | Mining Excavators, Marine Propulsion, Industrial |
| K38 | 3066884 | 3020613, 3066882 | K38 Series (V12) | High-Horsepower Generators, Mining Trucks |
| K50 | 3066291 | 3066292, 3076769 | K50 Series (V16) | Marine Vessels, Extra-Large Mining Equipment |
| ISX15 | 4101432 | 4298626, 4089371, 4954905 | ISX / QSX15 (Signature) | Highway Trucks, Freight Transportation |
| ISF 2.8 | 5267994 | 5267994 (Standard) | ISF 2.8 Series | Foton Tunland, JAC Trucks, Light Vans |
| ISF 3.8 | 4995830 | 4995830 (Standard) | ISF 3.8 Series | Medium Duty Trucks, Foton Aumark |
View all specs in our Cummins Camshaft Catalog.
A1: Symptom: Reduced valve lift, misfiring, and high metal content in engine oil. Diagnosis: Lobe “spalling” (surface pitting) caused by high-pressure valve spring contact and insufficient oil lubrication during cold starts. Solution: Our 3801763 replacement camshafts utilize precision induction hardening reaching 62 HRC, which provides a durable wear-resistant surface that withstands the impact of heavy-duty valve trains.
A2: Technical Detail: Camshaft thrust plate end play must be verified within 0.05mm – 0.20mm. Pro-Tip: It is mandatory to replace all valve tappets (lifters) during camshaft replacement. Installing new lobes against worn tappets will create uneven contact pressure, causing the new camshaft to fail within hours.
A3: Diagnosis: Big Cam engines operate at high combustion pressures, which increases the impact force on the camshaft lobes. Our Solution: We use deep-profile induction hardening on the lobe surfaces. This process ensures the hardness penetrates deep into the material, maintaining the camshaft profile integrity under the continuous high-RPM loads required by heavy mining equipment like the Komatsu D155.
Note: Customized/billet development based on drawings or samples is also available for high-performance or obsolete engine applications.
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