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© 08/2013 ECHO Inc.
MAINTENANCE CS-370
Sprocket
• A damaged sprocket will cause premature damage or
wear of saw chain.
• When the sprocket has worn out 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 cleaner 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 Arrestor Muffler
• The spark arrestor muffler controls the exhaust noise and prevents hot, glowing particles of carbon from
leaving the muffler.
• Make sure the spark arrestor 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 arrestor.
This requirement also applies to all U.S. Forest Service lands. In some of these areas, the spark arrestor
system must be certified per USDA Forest Service Regulation SAE J335.
Check with your local or state authorities for specific regulations in your area. Failure to follow these
requirements is a violation of the law.
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