Products Description
ECHO CS4000, CS4200, CS4400 Sprayer Parts – Worm Gear
Key Drive Component for Echo Chainsaws, Sprayers & Trimmers
The worm gear is a critical drive component in many Echo power tools, including chainsaws, sprayers, and brushcutters. It transfers rotational motion from the engine to drive essential systems like the oil pump, ensuring proper lubrication for the chain and bar.
Technical Profiles & Materials
OEM-Spec Replacement Fitment – Several worm gears are confirmed compatible with CS4000, CS4200, and CS4400 models, including V652000021 (oil pump worm gear) , A556000171 (.325" spur sprocket) , and X243-000020 (chain) . Verify your specific model number and serial number range before ordering.
Wide Model Compatibility – The V652000021 worm gear fits CS3000, CS3400, CS3450, CS4200ES, CS4400, CS600P, and many other Echo models across specified serial number ranges . The A556000171 sprocket fits CS400, CS440, CS3600, CS3700, CS3900, CS4100, CS4200, CS4400, CS4500, and CS4510 .
Durable Construction – Manufactured from high-quality materials to withstand the vibration, torque, and heat of chainsaw and sprayer operation. Aftermarket options from ISO-certified manufacturers are available with 2-year warranty coverage .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Compatible Models | CS4000, CS4200, CS4400, CS3000, CS3400, CS3450, CS600P, CS680, PPT series |
| 2 | OEM Part No. (Worm Gear) | V652000021 (oil pump) |
| 3 | OEM Part No. (Sprocket) | A556000171 (.325" spur) |
| 4 | Chain Compatibility | X243-000020 (.325", .050", 64 links) |
| 5 | Cross-Reference | 43706338330, 437-063-38330, V652000090 |
| 6 | Material | High-quality metal/steel |
| 7 | Function | Drives oil pump / power transmission |
| 8 | Unit of Sale | 1 piece |
Products Application
Chainsaw Oiling System Restoration
The V652000021 worm gear drives the oil pump on CS4000, CS4200, CS4400, and many other Echo models . If the chain runs dry or oil output is insufficient, a worn worm gear is the likely cause. Replacing it restores proper lubrication and prevents bar and chain damage.
Power Transmission & Drive System
The A556000171 .325" spur sprocket is a direct-fit replacement for the chain drive system on CS4000, CS4200, CS4400, and compatible models . Worn sprockets cause poor power transfer and chain slippage. Replacing the sprocket restores reliable chain engagement and smooth cutting performance.
Preventative Maintenance
For professional and heavy-duty users, replacing the worm gear and sprocket proactively prevents field failures. Regular inspection of drive components ensures consistent performance and extends equipment service life. Servicing or replacing these parts during routine maintenance is recommended to keep saws running efficiently.
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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YOUR PROFESSIONAL ONE-STOP SOURCE
FOR 10000+ OUALITY PARTS
Verified Factory Excellence
BACKED BY 200+ TRUSTED FACTORY PARTNERS
Production process
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Customer Reviews
FAQ
Q: How do I confirm which worm gear fits my Echo model?
A:Check your model number and serial number on the housing. The V652000021 worm gear fits Echo CS4000, CS4200, CS4400, CS3000, CS3400, CS3450, CS600P, and many other Echo models . The A556000171 sprocket fits CS400, CS440, CS3600, CS3700, CS3900, CS4100, CS4200, CS4400, CS4500, and CS4510 . Always verify your serial number range before ordering, as compatibility can vary by production date.
Q: What are the symptoms of a worn worm gear?
A: Common symptoms include insufficient or no oil reaching the bar and chain, the chain running dry during operation, increased friction and heat on the guide bar, and visible wear or stripping on the gear teeth. If the oil pump is functioning but no oil reaches the bar, the worm gear is often the cause. Regular inspection during clutch and oil pump servicing can catch wear early.
Q: Can I replace just the worm gear or do I need a complete kit?
A: The worm gear (V652000021) and spur sprocket (A556000171) are available as individual components. For a full driveline service, complete clutch drum kits are also available that include the worm gear, sprocket, clutch drum, needle bearing, and oil pump in one package. Replacing multiple components simultaneously prevents premature failure of new parts. Aftermarket kits offer comprehensive solutions at competitive prices.
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