The CUMMINS 6CT8.3 crankshaft (3917320 / 3918986) is purpose-built for the popular 6CT8.3 series engines, delivering reliable power for construction machinery, heavy-duty trucks, and industrial generators. With a displacement of 8.3 liters, the engine produces up to 150 kW output, requiring a crankshaft that combines strength, precision, and durability.
Manufactured from high-grade 40Cr forged steel and treated with multi-stage heat processing, this crankshaft ensures extended service life, excellent torsional resistance, and smooth operation even under continuous heavy load cycles.
Product Specifications
|
ENGINE NO |
6CT8.3 |
Gross weight(kg) |
76.05 |
|
OEM/PART NO |
3917320/3918986 |
Length(mm) |
967 |
|
Crankshaft Material |
Forged steel 40Cr |
Main journal(mm) |
98 |
|
Engine type |
diesel engine |
Crankpin journal(mm) |
76 |
|
Application |
Komatsu PC300‑7 Excavators |
Stroke(mm) |
153 |
|
Anti-rusty Coating |
Yes |
Hardness(HRC) |
HRC52-58 |
Product Advantages
(1)Heavy-Duty Durability
- Handles high torque from 8.3 L Cummins engines
- Reliable for Komatsu PC300‑7 excavators, Dongfeng Tianlong heavy trucks, and 150 kW power generators
- Service life 3–5 years under heavy load conditions
(2)Medium Frequency Quenching (Heat Treatment)
Tempering → Induction Hardening → Stress-Relief Tempering
Surface hardness: HRC 52–58, hardened layer depth: 3–5 mm
Balances internal toughness with superior surface wear resistance
(3)Journal Precision Polishing
CNC grinding achieves roundness ≤0.005 mm and Ra ≤0.4 µm
Enhances lubrication film, reducing wear and oil consumption
Ensures smooth engine operation when paired with dynamic balancing
(4)Rigorous Quality Control
Quality Check That Keeps You Working
Every 3917320 crankshaft gets a full work-over before it leaves our floor: we UT-scan the forgings, MT-check each journal, then spin-balance until the residual wobble sits under 10 g·cm/kg. Thirty-plus checkpoints are logged, and if your site demands paperwork, SIO certificates can offer-no surprises, no comebacks.
Applicable Equipment
The CUMMINS 6CT8.3 crankshaft (3917320 / 3918986) is suitable for:
Excavators: Hyundai R330LC-9S, Volvo EC290, Komatsu PC300-7, Hitachi EX200
Tractors: Case IH MX275/MX285 Tractor, New Holland TG255/TJ275 Tractor,
Product packaging
For CUMMINS 6CT8.3 crankshaft (3917320 / 3918986) , we offer packaging options: ply wood and crude wood. Each crankshaft is coated with anti-rust coating and wrapped in oil paper.
FAQ (Answering Common Questions)
Why Choose Zhejiang Weilin?
Specialized Expertise
We focus exclusively on forged steel crankshafts, ensuring deep technical knowledge and consistent quality.
Custom Solutions
Available for OEM replacement and aftermarket applications.
Competitive Pricing
Direct from manufacturer with efficient production and supply chain.
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