8615325134961
sales@weilindct.com
enLanguage

Yanmar Crankshaft

Your Professional Yanmar Crankshaft Supplier

 

Our goal is to become your true partner in the field of Yanmar crankshaft China. Zhejiang Weilin Mechanical Co., Ltd. is a national high-tech enterprise focusing on the production and trade Forged Steel Crankshaft in the field of Construction Machinery, Heavy Trucks, Marine, Generator Sets, Agricultural Machines, Automobiles, Diesel Engines, and etc. We have a skilled engineering team dedicated to refining every stage, from product development and process improvement to production oversight, ensuring every product delivered meets rigorous quality and performance standards. The price is competitive and the product is quality-assured, which is a good choice for your long-term cooperation.

 

 
 
Why Choose Us
 

Production Equipment: Our company possesses advanced production equipment, such as CNC grinding machine spindles, CNC grinding machine connecting rods, CNC lathes, CNC engine lathes, CNC crankshaft milling machines, semi-automatic quenching machines, CNC oil hole drilling machines, horizontal drilling and tapping machines, CNC keyway milling machines, crankshaft dynamic balancing machines, and non-destructive testing machines.

 

Production Market: Our products are well-received in the market and are exported to Europe, America, the Middle East, Southeast Asia, and other countries and regions.

 

Customized Solutions: We provide OEM drawing processing and personalized parameter customization services. You can receive a tailor-made solution within 72 hours to meet your unique needs.

 

Our Services: Our professional after-sales service and technical team is dedicated to providing you with professional assistance. We offer a one-year warranty for your peace of mind. If your crankshaft fails during this period due to material or manufacturing defects, we will provide free repair or replacement services.

 

Advantages of Yanmar Crankshaft

 
 
01
 

Optimal performance

The crankshaft is engineered to convert linear piston motion into rotational motion, which is vital for engine operation.

 
02
 

Maintains engine efficiency

A genuine Yanmar crankshaft helps ensure that the engine runs smoothly and effectively.

 
03
 

Restores original performance

A new crankshaft can restore factory-level performance, balance, and reliable power delivery after wear or damage.

 
04
 

High-quality materials

Yanmar crankshafts are made from high-quality, heavy-duty, precision-ground steel for strength and a long service life.

 
05
 

Corrosion resistance

The use of corrosion-resistant materials helps the crankshaft withstand demanding environmental conditions, extending its service life.

Crankshaft for Yanmar 4tne94

 

Specification of Yanmar Crankshaft

 

ENGINE NO

4TNV94

Gross weight(kg)

24

OEM/PART NO

129902-21000

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

 

Features of Yanmar Crankshaft

Forged Steel Reliability

Each 4TNV94 crankshaft (129902‑21000) 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.

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.

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.

 

Application of Yanmar Crankshaft

 

 

Yanmar crankshafts are primarily used in their engines to convert the linear, reciprocating motion of the pistons into rotational motion, which then powers a variety of machinery.

Their applications range from small construction and garden equipment like generators, plate compactors, and pumps to larger marine propulsion and auxiliary engines. A Yanmar crankshaft serves as the essential, central component that drives the engine's power to the driven equipment.

 

 
Components of Yanmar Crankshaft
 
01/

Main journals: These are the main bearing journals that are supported by the engine block.

02/

Flywheel: A heavy wheel that is connected to the end of the crankshaft to maintain rotational momentum and store energy.

03/

Bearing caps and inserts: These secure the crankshaft in the engine block, with bearing inserts providing a smooth surface for the journals.

04/

Gears, pins, and bolts: These are all used for various connections and timing mechanisms within the engine assembly.

05/

Crankpins: These are the journals that the connecting rods attach to.

06/

Webs: The parts that connect the main journals to the crankpins.

07/

Connecting rod: This part connects the piston to the crankshaft's crankpin.

08/

Pistons and rings: The pistons are attached to the connecting rods, and the rings seal the combustion chamber.

 

Packing and Shipping of Yanmar Crankshaft

 

Packing

Standard export plywood or raw wood, anti-rust coating, and plastic protection caps.(Plywood is used by default. raw wood is available at an additional cost.)

Shipping

Sea freight as standard

 

Certificate

 

p20250728113126d5a11.jpg (800×1100)

 

FAQ

 

Q: What materials are used for Yanmar crankshafts?

A: Our crankshafts are made of forged alloy steel or nodular cast iron for high strength, toughness, and fatigue resistance.

Q: What heat treatment processes do your crankshafts undergo?

A: They go through quenching, tempering, induction hardening, and surface nitriding to enhance hardness and wear resistance.

Q: Are your crankshafts dynamically balanced?

A: Yes, every Yanmar crankshaft is dynamically balanced to minimize vibration and ensure smooth engine performance.

Q: Can Yanmar crankshafts be repaired or reground?

A: Yes, many models can be reground within the allowable undersize tolerance for remanufacturing.

Q: What are common causes of Yanmar crankshaft failure?

A: Failures may result from oil starvation, bearing wear, overload, improper installation, or long-term metal fatigue.

Q: How do you ensure the quality of your Yanmar crankshafts?

A: We perform material analysis, hardness inspection, magnetic particle testing, ultrasonic testing, and full dimensional checks.

We're well-known as one of the most reliable yanmar crankshaft manufacturers and suppliers in China. Please feel free to wholesale high quality yanmar crankshaft made in China here from our factory. We also accept customized orders.

yanmar l100 crankshaft, 129900 21000, 129902 21000