Crankshaft For Komatsu S6D114-3|6745-31-1120 For Excavators WA380-6 WA380-7 WA430-6 Loaders WA380-6 WA380-7 Bulldozers D61EX/PX-17 D61EX/PX-18

Need a 6745-31-1120 that matches OEM quality, but don't want to pay expensive OEM prices? Our KOMATSU S6D114-3 crankshafts start with 40Cr forgings from China's top mills, are finished and balanced in our own facility, and then come with a full 12-month warranty. If we find a material or workmanship problem, even before you do, we'll recall the lot and cover shipping, no matter how high the cost. Same torque, less budget, less risk.

Zhejiang Weilin Machinery & Parts Co., Ltd. is a professional and experienced manufacturer specializing in the production of high-strength forged steel crankshafts. We are proud to present our premium quality crankshaft for the Komatsu S6D114-3 engine.

• Forged for strength – Manufactured from 40Cr steel, giving higher tensile strength than standard cast iron crankshafts.
• Wear resistant – Surface induction hardening forms a layer around 3–5 mm deep, hardness up to HRC 52–58.
• Smooth operation – Balanced and ground journals reduce vibration and extend bearing life.
• Direct replacement – Built to Komatsu standards, no modification required for installation.
• Reliable in multiple uses – Suitable for excavators, loaders, and generator applications.

As a specialist in forged steel components, we understand the rigorous demands of diesel engines. Our S6D114-3 crankshaft is manufactured using advanced forging techniques, which offer significant advantages over cast alternatives:

1. Superior Strength & Durability: The forged steel grain structure flows continuously along the shape of the crankshaft, resulting in exceptional mechanical strength and resistance to fatigue and impact.

2. High Reliability: Designed to withstand the high cylinder pressures and torque of turbocharged engines, ensuring a long service life even under the most challenging working conditions.

3. Precision Engineering: Machined to strict tolerances for optimal fit and smooth rotation, reducing friction and wear on engine bearings.

Each 6745-31-1120 undergoes multiple steps before shipping:

• Forging and heat treatment to improve structure
• Induction hardening for wear resistance
• Precision grinding of journals for accuracy
• Ultrasonic and magnetic inspections for internal and surface defects
• Balance testing to minimize vibration in the engine

Third-party inspection reports can be provided when required.

For 6745-31-1120, packed in raw wood or plywood export cases with protective oil coating and plastic caps. Standard stock units can usually ship within 72 hours. Larger or custom orders follow production scheduling

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