Instructions / Assembly

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© 1/2017 ECHO Inc.
CS-400 MAINTENANCE
Guide Bar
1. Clean before using.
2. Clean the groove (A) of the guide bar
with a small screwdriver.
3. Clean oil holes (B) with a wire.
4. Invert guide bar periodically.
5. Clean the bar mount area before
installing of the bar.
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 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.
A
B
Worn: 0.5 mm (0.020 in.)
Cylinder
fins