The CAT C13 crankshaft (313-3997) is the key rotating component inside the C13 engine, supporting continuous heavy-duty operation. It is a forged steel part designed to handle high torque and vibration, making it suitable for use in CAT construction machinery as well as generator sets. This model is commonly found in CAT 345D/C and 349D excavators, 730 articulated trucks, and other equipment powered by the C13 diesel engine.

Product Specifications

ENGINE NO	C13	Gross weight(kg)	135
OEM/PART NO	313-3997/2219364	Length(mm)	1088.5
Crankshaft Material	Forged steel 42CrMo	Main journal(mm)	108
Engine type	diesel engine	Crankpin journal(mm)	89
Application	CAT345CL,345C CAT	Stroke(mm)	157
Anti-rusty Coating	Yes	Hardness(HRC)	HRC52-58

Features & Benefits

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.

CAT C13 crankshaft ISO certification

Applications

Compatible models for CAT C13 crankshaft：

Excavators: CAT 345D, 345C, 349D

Articulated Truck: CAT 730

CAT C13 Diesel Generator Sets

Other heavy-duty CAT machinery powered by the C13 engine

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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.)

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FAQ (Answering Common Questions)

Q: Is this crankshaft suitable for all CAT C13 engines?

A: Yes, it is designed for the C13 series and matches OEM reference 313-3997.

Q: How long does the CAT C13 crankshaft usually last in operation?

A: Service life depends on working conditions, but with proper maintenance, it typically runs much longer than cast versions.

Q: Can I request third-party testing?

A: Yes, we can arrange ISO or other certified lab reports if needed.

Q: What is your warranty policy?

A: We provide a 12-month warranty covering defects in materials and workmanship.

Q: Do you accept urgent or small quantity orders?

A: Trial orders are welcome, and for stock models we can ship within 72 hours.

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