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491
Sprocket
• A damaged sprocket will cause
premature damage or wear of saw
chain.
• When the sprocket has worn 0.5
mm (0.020 in.) or more, replace it.
• Check sprocket when you install
new chain. Replace it if worn.
Some tree sap and resins are corrosive. Thoroughly wash the guide
bar and sprocket areas after each use, then coat metal parts with light
oil.
Cooling System Cleaning
• Check periodically.
• Clogged fins will result in poor
engine cooling.
1.
Remove air filter cover,
cylinder cover, and starter.
2.
Use compressed air or wooden
tool to remove dirt and dust from
between fins to let cooling air pass easily.
Spark Arrester Muffler
• The spark arrester muffler controls the exhaust noise and prevents hot,
glowing particles of carbon from leaving the muffler.
• Make sure the spark arrester screen is in good repair and properly seated
in the muffler.
• Certain internal combustion engines operated on forest, brush, and/or
grass-covered areas in the states of Washington, Oregon, Idaho,
California, Minnesota, New Jersey and Maine, are required to be
equipped with a spark arrester.
X7503312606
© 02/24 ECHO Incorporated
MAINTENANCE
0.5 mm (0.020 in.)
Cylinder
fins
49
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