What does a professional crankshaft factory with annual output of tens of thousands of units and 19 years of deep focus on the replacement aftermarket actually look like?
In Lishui, Zhejiang, Zhejiang Weilin Machinery Parts Co., Ltd. provides the answer with real facility data. Since its founding on April 26, 2007, Weilin has remained 100% focused on the aftermarket replacement (non‑OEM) forged steel crankshaft segment. With four core strengths – early market entry, strong brand recognition, comprehensive product range, and deep process expertise – Weilin has become a recognized benchmark in China's engine forged steel crankshaft aftermarket.
Facility Scale: Integrated R&D and Production Layout
Weilin's total site covers approximately 40 mu (about 6.6 acres), with built‑up areas covering production, R&D, and administration:
| Area | Size | Description | ||
| New Plant | 12,000 ㎡ | 6‑story modern facility (2,000㎡ per floor), integrating precision machining and inspection centers | ||
| Two Older Workshops | 6,000 ㎡ | Covering forging, heat treatment, and rough machining lines | ||
| Office Building | 3,000 ㎡ | Including provincial‑level high‑tech enterprise R&D center and customer co‑development lab | ||
| Total Built Area | Approx. 21,000 ㎡ | --------------- |
This integrated R&D‑production layout ensures full in‑house control from design, tooling, forging, heat treatment, machining, to inspection, providing the physical foundation for "co‑development with customers."
Production Capacity & Team: Tens of Thousands of Crankshafts per Year with ~100 Skilled Staff
Weilin currently employs approximately 100 people, with technical and quality control personnel accounting for over 30%. The company produces tens of thousands of forged steel crankshafts annually, covering major engine brands including CAT, KOMATSU, ISUZU, DAEWOO, YANMAR, HYUNDAI, VOLVO, BENZ, and JOHN DEERE. For mature crankshaft models, Weilin ensures stable mass supply, meeting the restocking needs of global distributors and repair chains.
Core Competitiveness: Focus Leads to Mastery
Weilin's advantage comes not only from scale but also from nineteen years of undivided focus:
· Full Range with Exclusive Models: The company offers over 100 types of DCT forged steel crankshafts, covering construction machinery, heavy trucks, generator sets, diesel engines, and more. Many models (including specific CAT and KOMATSU variants) are available exclusively from Weilin in the entire industry – built on years of accumulated mold libraries and process databases.
· Mature and Stable Processes: On high‑power models like the CAT C27 crankshaft, Weilin's manufacturing experience, heat‑treatment curve control, and fillet‑rolling strengthening processes have been validated through tens of thousands of units, backed by extensive application data feedback.
· Small‑Batch Customization & Rapid Response: Unlike large OEM suppliers (such as Tianrun) with batch‑size constraints, Weilin is 100% aftermarket‑focused, making the company highly flexible in small‑batch customization and rapid sample / small‑order delivery. For urgently needed models, Weilin can prioritize production scheduling.
Differentiation from Large OEM Suppliers like Tianrun
Weilin clearly understands its competitive edge:
| Dimension | Weilin | Large OEM Suppliers (e.g., Tianrun) | ||
| Market Focus | 100% aftermarket replacement | Primarily original‑equipment OEM supply | ||
| Product Depth | Deep focus on mainstream aftermarket models (CAT/KOMATSU, etc.) | Broad coverage but slower response for aftermarket variants | ||
| Order Flexibility | Small‑batch customization, fast sample delivery | Mass‑production oriented, high customization barriers | ||
| Service Response | Deep understanding of repair shop/distributor pain points | Standardized processes, limited personalized service |
"Weilin's goal is not to become the largest crankshaft factory, but to become the world's most comprehensive and fastest‑responding OEM (aftermarket replacement) forged steel crankshaft manufacturer." – This is Weilin's clear market positioning.
Quality System & Certifications
Weilin was first recognized as a National High‑Tech Enterprise in 2011 and owns a provincial‑level high‑tech enterprise R&D center. It has also been certified as a Zhejiang Provincial Sci‑Tech SME, Zhejiang Provincial Clean Production Enterprise, and Zhejiang Provincial Law‑Based Management Model Unit. Its excavator forged steel crankshaft has been listed as a National Torch Program and National Innovation Fund Project, with 5 national invention patents and 15 utility model patents granted.
Closing
Early entry gave us the most comprehensive mold library; full product range enables us to offer models others don't have; deep focus means we know every detail of fatigue life and assembly tolerances for each crankshaft. Global aftermarket distributors, repair chains, and remanufacturing enterprises are welcome to contact Weilin via the official website for detailed product catalogs covering the CAT C27 crankshaft and all major brand crankshafts.