Products Description
TS420 Crankshaft – Precision Engine Component for Stihl TS410 & TS420 Cut-Off Saws
Complete Crankshaft Assembly for Stihl Concrete Cutters
The crankshaft is the central rotating component of the Stihl TS410 and TS420 cut-off saw engines, responsible for converting the linear motion of the piston into rotational power that drives the cutting disc. Over time, crankshafts can suffer from wear on bearing journals, bent shafts, worn threads, or scoring, leading to excessive vibration, rough running, and reduced cutting performance. This replacement crankshaft is manufactured to original equipment specifications, ensuring a direct fit and reliable operation for demanding construction, demolition, and masonry cutting applications.
Technical Profiles & Materials
OEM-Spec Fitment – Replaces Stihl OEM part number 4238 030 0400 . Designed as a direct replacement for Stihl TS410 and TS420 cut-off saws. Available in both genuine Stihl and high-quality aftermarket alternatives . Aftermarket options provide a cost-effective solution while maintaining reliable performance.
High-Strength Steel Construction – Manufactured from high-strength steel with precision-ground bearing journals for durability and smooth rotation . The balanced counterweights help minimize vibration and operator fatigue during extended cutting operations. Features accurate threads and seating faces for secure attachment of the flywheel and clutch. A corrosion-resistant finish on exposed areas helps protect against harsh site conditions .
Precision Engineering – Precision-machined journals and threads with correct bearing and seal locations ensure proper fitment . Accurate counterweight geometry helps reduce vibration, supporting cleaner cuts and longer service life of surrounding components . The crankshaft is compatible with standard crank bearings and oil seals .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Part No. | 4238 030 0400 |
| 2 | Compatible Models | Stihl TS410, TS420 |
| 3 | Also Compatible | TS400 (same platform) |
| 4 | Material | High-strength steel with precision-ground journals |
| 5 | Fuel Compatibility | Not compatible with >10% ethanol fuel |
| 6 | Shipping Weight | Approx. 0.54kg – 1kg |
| 7 | OEM Pricing (Typical) | ~$335.99 (genuine) |
| 8 | Aftermarket Pricing | ~$59 – $125.95 |
| 9 | Unit of Sale | 1 piece |
Products Application
TS410 & TS420 Engine Rebuild
Direct replacement when the original crankshaft is damaged, bent, or shows signs of wear. Ideal for professional repair or maintenance of heavily used saws . The crankshaft helps restore cutting accuracy by reducing play in the rotating assembly, ensuring the saw runs smoothly and reliably under daily use .
Crankshaft Removal & Installation
The workshop manual details the removal and installation procedure, requiring the following steps: remove the cast arm with guard, ignition module, flywheel, clutch drum, handlebar, fuel tank housing, cylinder, and piston .
Cost-Effective Restoration
Aftermarket crankshafts offer a cost-effective way to extend the service life of the machine without compromising fit . Warranty coverage varies by supplier, with some offering 12-month warranties and repair services available for user-related faults .
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm this crankshaft fits my TS420?
A:Check your machine model number on the housing. This crankshaft fits Stihl TS410 and TS420 cut-off saws. The OEM part number is 4238 030 0400 . Aftermarket options are available as a direct-fit alternative .
Q: What are the symptoms of a worn or damaged crankshaft?
A: Symptoms include excessive vibration during operation, scoring on bearing journals, bent shafts, worn threads, rough running, loss of cutting accuracy, or play in the rotating assembly . If the saw produces unusual noise or vibration, crankshaft inspection is recommended.
Q: What other components should be replaced when installing a new crankshaft?
A: Workshop manual specifies that new grooved ball bearings and oil seals must always be fitted when removing the crankshaft . It is also recommended to inspect the cylinder and piston assembly and replace them if necessary .
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