Looking for 3907803 Cummins 4H crankshaft? Factory direct forged shafts for Tata trucks and H-series industrial pumps. Prevents stress cracking. Request quote today!
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The Cummins 4H series crankshaft (OEM: 3907803) is a heavy-duty forged component engineered for H-series industrial and truck engines.
It resolves fillet fatigue issues and fits equipment including Tata LPT trucks, industrial pump sets, and H-series power units.
In stock for immediate global export.
The Cummins 4H crankshaft OEM 3907803 is a forged steel replacement for 3.9L diesel engines. Precision-machined journals and nitrided surfaces ensure OEM-level durability and fatigue resistance. Widely used in excavators, trucks, gensets, and agricultural machinery, this crankshaft is trusted by distributors and rebuilders worldwide.
| Specification | Value |
|---|---|
| Product Type | Crankshaft |
| Material Grade | 42CrMo Forged Steel |
| Forging Type | Fully Forged & Quenched |
| Surface Treatment | Nitrided & Induction Hardened |
| Hardness Range | 54-60 HRC (Journals) |
| Balancing Grade | G6.3 Dynamic Balance |
| Fatigue Resistance | Reinforced Radius Fillets |
| OEM Reference | 3907803 |
| Cross Reference | 3907804, H-Series Shaft |
| Typical Applications | Tata LPT Trucks, Industrial Pumps, Agricultural Tractors |
| Application Category | Industrial Power & Mid-Duty Commercial Logistics |
Ruich Value ensures every crankshaft meets international standards, minimizing downtime and maximizing reliability for heavy-duty diesel applications.
We also supply Cummins 4BT, 6BT, 6CT, M11, NT855, and K19/KTA19 crankshafts.
| Cummins Engine Model | Core Displacement (L) | Serial | Associated Models (for Cross-Reference) | Key Applications |
|---|---|---|---|---|
| B3.3 | 3.3 | B / ISB / QSB Series (Light & Mid-Range) | B3.3 (M16/18) | Skid Steer, Excavator, Forklift, Gen-Set |
| 4BT/3.9 | 3.9 | B / ISB / QSB Series (Light & Mid-Range) | 4BT3.9, 4BTA | Diesel Conversion Swap, Jeep Swap, Ford Van, Step Van |
| ISB4.5 / B4.5 | 4.5 | B / ISB / QSB Series (Light & Mid-Range) | 4ISBE, 4ISDE, ISB 4.5L Euro V | Medium-Duty Truck, Bus, Delivery Vehicle |
| 4H | 4.0 | H Series (Mid-Range) | 4H / 4HJ / 4HT | John Deere Excavators (200D/210D), Caterpillar Skid Steers (226B/232B), Komatsu Forklifts (FG20T-25), |
| 6BT / B5.9 | 5.9 | B / ISB / QSB Series (Light & Mid-Range) | 6BT5.9, 12 Valve (12V), 3965010 | Dodge Ram 1500/2500/3500 (1989-2002), Agricultural Tractor |
| ISB6.7 / QSB6.7 | 6.7 | B / ISB / QSB Series (Light & Mid-Range) | 6ISBE, 6ISDE, ISB 6.7L Euro V | Dodge Ram 2500/3500 (2007.5+), School Bus, Fire Truck |
| 6CT / ISC 8.3 | 8.3 | C / ISC / QSC Series (Mid-Range Heavy-Duty) | 6CTA, C8.3, 6D114 | Freightliner, Fire Apparatus, Motorhome (RV), Dozer |
| ISL8.9 / QSL9 | 8.9 | L / ISL / QSL Series (Heavy-Duty) | ISL, ISB 8.9L | Heavy-Duty Bus, RV Coach, Crane, Volvo/Kenworth Truck |
| M11 / ISM / QSM11 | 10.8 | M / ISM / QSM Series | - | Road Truck, Semi-Truck, Haul Truck, Gen-Set |
| NT855 | 14 | N / NT Series (Classic Mechanical) | N14, NH220 (Earlier), D85 | Peterbilt, Kenworth, Classic Truck, Heavy Equipment |
| K19 / QSK19 | 19 | K / QSK Series (High Horsepower) | KTA19, KT19 | Mining, Marine Propulsion, Drill Rig, Power Generation |
| K38 / QSK38 | 38 | K / QSK Series (High Horsepower) | KTA38, KAT38, GTA38 | Large Mining Excavator, Off-Highway, Gen-Set |
| ISF2.8 / ISF3.8 | 2.8 / 3.8 | F / ISF Series (Light Commercial) | - | Foton, GAZelle, Light Commercial Van |
| A2300 | 2.3 | A Series (Small Utility) | - | Small Gen-Set, Utility Equipment |
| ISL9 / QSL9 (6L/9.3L) | 8.9 / 9.3 | L / ISL / QSL Series | L9, ISL 9.3L Euro V/VI | Dongfeng Trucks (DFL4251), Shantui Bulldozers (SD32D), |
| NH220 | 14 | N / NT Series (Classic Mechanical) | NT855, N14, NH220 | Peterbilt 359, Kenworth W900, Classic Truck, Heavy Equipment, Vintage Tractor |
A1: Symptom: Fine stress cracks appearing at the journal radius or sudden shaft fracture under load. Diagnosis: In 4H engines used in high-torque industrial pumps or Tata trucks, this is often caused by cyclic bending stress exceeding the material’s limit during heavy lugging. Solution: Our 3907803 crankshafts utilize high-purity forged steel with a specialized deep-nitriding process to enhance the fatigue limit of the journal fillets, preventing crack initiation.
A2: Technical Detail: Main bearing caps must be torqued precisely to Cummins H-series specifications, and end play must be verified between 0.12mm – 0.45mm. Pro-Tip: Always check the alignment of the flywheel housing on 4H industrial units; any misalignment can cause excessive parasitic vibration, leading to premature main bearing wear and crankshaft fatigue.
A3: Diagnosis: Industrial 4H engines often operate in dusty, high-duty cycle environments, leading to abrasive journal scoring. Our Solution: We implement multi-stage induction hardening on all journals. This ensures that the 3907803 shaft maintains a surface hardness of 54-60 HRC, allowing it to withstand contaminated oil conditions longer than standard, un-nitrided replacements.
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