SPERTEK 3/8" 6-Tooth Chainsaw Drum Spur Sprocket for Echo CS-370/CS-400 — Bearing Included, OEM Fit

SPERTEK's 3/8" 6-tooth chainsaw drum spur sprocket is a direct-fit replacement for Echo A556000400, designed for Echo CS-370 and CS-400 models (3/8" pitch only) and ships with the bearing included.

If your Echo CS-370 or CS-400 is showing worn sprocket teeth, poor chain engagement, or noisy operation, replacing the clutch drum spur sprocket restores smooth chain drive and reliable performance. This SPERTEK unit matches the original equipment dimensions—3/8" pitch and six teeth—so it installs without modification and keeps your saw running as intended.

Will this sprocket fit my Echo CS-370 or CS-400?

Yes—this SPERTEK drum spur sprocket is manufactured to replace Echo part A556-000400 and fits Echo CS-370 and CS-400 models that use a 3/8" pitch chain. Confirm your saw’s pitch and part number before ordering to ensure compatibility.

• Replaces Echo OEM A556-000400
• Compatible with Echo CS-370 and CS-400 (3/8" pitch only)
• Direct-fit dimensions for straightforward installation

How does the 6-tooth, 3/8" pitch design affect performance?

The 6-tooth layout and 3/8" pitch determine chain engagement and torque transfer from the clutch to the chain. Correct tooth count and pitch keep the chain tracking accurately on the bar and help maintain consistent cutting speed and reduced wear.

• 6 teeth ensure proper engagement with the chain drive links
• 3/8" pitch matches specified chain sizes to avoid slippage
• Precision tooth spacing promotes even wear and smoother operation

Does this part come ready to install, and what’s included?

The SPERTEK sprocket ships with the bearing included, reducing the number of separate purchases and simplifying the replacement process. It arrives as a complete clutch drum spur assembly so you can reinstall quickly after removing the worn part.

• Bearing included for convenient replacement
• Pre-engineered to match OEM fitment and mounting points
• Quality-checked for correct tooth profile and pitch

How should I maintain the sprocket to extend its life?

Routine maintenance—keeping the chain properly tensioned, lubricated, and clean—reduces wear on the sprocket teeth and bearing. Inspect the sprocket regularly for chipped teeth, excessive wear, or bearing play and replace it promptly when signs of damage appear.

• Regularly check chain tension and lubrication
• Clean debris from the clutch drum area after heavy use
• Replace when teeth are visibly worn or bearing loosens

Who is this for: This SPERTEK 3/8" 6T chainsaw drum spur sprocket is for owners, mechanics, and pro users of Echo CS-370 or CS-400 saws who need a dependable, OEM-compatible replacement part. It suits anyone seeking a straightforward swap with the correct 3/8" pitch and 6-tooth specification, and who prefers receiving a unit with the bearing included to speed up repairs.

If you have questions about fitment or installation, contact our support team with your saw model and serial number—we’ll help confirm compatibility and guide you through the replacement steps.