CAT 3406E crankshaft(4P9121) is made from high-quality raw materials 42CrMo. Compared to cast iron crankshafts, they offer 27.9% higher tensile strength and 78.6% higher yield strength. The unique induction hardening process creates a 3-5 mm hardened layer (HRC 52-58), which improves wear resistance by 15% compared to nitrided cast iron. Our crankshafts have earned the trust of distributors worldwide.
Product Specifications of CAT 3406 crankshaft
|
ENGINE NO |
3406 |
Gross weight(kg) |
175 |
|
OEM/PART NO |
4P9121 |
Length(mm) |
1210 |
|
Crankshaft Material |
Forged steel 42CrMo |
Main journal(mm) |
120.65 |
|
Engine type |
diesel engine |
Crankpin journal(mm) |
97 |
|
Anti-rusty Coating |
Yes |
Hardness(HRC) |
HRC52-58 |
Features & Benefits – CAT 3406 crankshaft (4P9121)
1. Stronger core
We buy 42CrMoA forgings shaped to our own pattern, then machine them in our factory. The tighter grain beats cast iron for bending and impact resistance.
2. Smooth journals
Every pin and main is ground to ±0.005 mm roundness and 0.4 µm Ra, so bearings seat first time and last longer.
3. Hard skin, Tough heart
Induction hardening adds 3–5 mm of HRC 52–58 on the wear faces while the core stays ductile-no cracks after long shifts.
4. Cold-weather ready
Tested at –40 °C; power stays steady in Siberian winters.
5. Stock & custom
Common specs on the shelf within a week dispatch; non-stock journals or etched logos ready in under four weeks.
Quality and Testing
Every unit goes through multiple inspection stages: ultrasonic and magnetic testing for hidden flaws, hardness checks, and dynamic balancing. The balance test ensures the residual imbalance remains very low, so the engine runs with less vibration. For clients who need extra assurance, we can also provide third-party inspection reports.
Applications
Compatible models for CAT 3406 crankshaft：
Bulldozers: D8N D8R D9N D9R
Loaders：980C 980F 980G 988B 988F
Excavators: 245 245B 245D 375 358B 385C
CAT 3406 Diesel Generator Sets
Other heavy-duty CAT machinery powered by the 3406 engine
Packaging & Delivery
The crankshafts are packed in either plywood or raw wood. Anti-rust oil is applied as standard, and protective plastic caps are added to prevent damage during transport. For long-distance shipping, especially sea freight, an butter coating is available. Normally, stock models are dispatched within a few days.
(Plywood is used by default. raw wood is available at an additional cost.)
FAQ
Q1: Is this crankshaft suitable for all CAT 3406 engines?
A1: Yes, it is designed for the 3406 series and matches OEM reference 4P9121.
Q2: How long does the CAT 3406 crankshaft usually last in operation?
A2: Service life depends on working conditions, but with proper maintenance, it typically runs much longer than cast versions.
Q3: Can I request third-party testing?
A3: Yes, we can arrange ISO or other certified lab reports if needed.
Q4: What is your warranty policy?
A4: We provide a 12-month warranty covering defects in materials and workmanship.
Q5: Do you accept urgent or small quantity orders?
A5: Trial orders are welcome, and for stock models we can ship within 72 hours.
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