Need a drop-in 4TNE94 crankshaft without the dealer markup? Our 129900-21000 starts with prime-grade 40Cr forgings-sourced from a state-run mill under strict incoming QC-then finish-machined, balanced and induction-hardened in our own plant. Every blank is 100 % ultrasonic-scanned before it reaches our line, so you get the same fatigue life as the original at a smaller price tag. Stock units leave our warehouse in 72 hours, and custom part numbers can be turned around in days.

Product Specifications

ENGINE NO	4TNE94	Gross weight(kg)	24
OEM/PART NO	129900-21000	Length(mm)	556
Crankshaft Material	Forged steel 40Cr	Main journal(mm)	65
Engine type	diesel engine	Crankpin journal(mm)	58
Application	Yanmar Excavators	Stroke(mm)	110
Anti-rusty Coating	Yes	Hardness(HRC)	HRC52-58

Product Advantages

(1)Forged Steel Reliability

Each 4TNE94 crankshaft (129900-21000) is made from 40Cr forged steel, offering excellent resistance to bending and cracking.

Tensile strength over 1000 MPa and yield strength above 750 MPa, outperforming cast iron designs

Typical service life of 3–5 years in heavy-duty cycles, minimizing downtime

(2)Multi‑Stage Heat Treatment

Tempered, induction‑hardened, and stress‑relieved for balanced toughness and wear resistance

Surface hardness HRC 52–58 with 3–5 mm hardened layer

Withstands high torque and continuous excavation or fieldwork cycles

(3)Precision Journal Grinding

Journal surfaces polished to Ra ≤0.4 μm and roundness ≤0.005 mm

Reduces friction, oil consumption, and early wear

Ensures smoother operation with accurate dynamic balancing

(4) Stringent Quality Control

More than 30 quality checkpoints from forging to packaging

Ultrasonic flaw detection, magnetic particle inspection, hardness verification, and balance testing

Third‑party inspection certificates available on request

4TNV94 crankshaft ISO certification

Application

The YANMAR 4TNE94 crankshaft (129900-21000) is an ideal choice for:

Excavators: Yanmar ViO55‑A / ViO75‑A, Hyundai R60‑9 / R55‑7, Kobelco SK60‑C, Hitachi ZX65, Daewoo DH55‑7

Tractors: Yanmar YT335

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Packaging & Delivery

For 4TNE94 crankshaft, we offer our customers a choice of different types of packaging boxes: plywood and crude wood.

Lead Time: Stock items ship within 7 working days; customized production ~90 days

Logistics: Reinforced sea freight packaging, suitable for global distribution

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FAQ (Answering Common Questions)

Q: How do you keep it alive under real abuse?

A: We forge it from 40Cr, then run it through heat, quench, and draw so the journals hit 52–58 HRC.

Q: Can you provide third-party inspection certificates?

A: Yes, third-party test reports for hardness, balance, and hardened layer depth are available upon request.

Q: What is the expected service life under normal operation?

A: Typically 3–5 years in continuous-duty excavation and agricultural use, significantly longer than cast iron alternatives.

Q: Do you supply samples for testing?

A: Yes, samples are available, with fees refundable for bulk orders.

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