Operation Manual
28
CS-310
GUIDE BAR
•  Clean before using. 
- Clean the groove of the guide bar with a small 
screwdriver. 
- Clean oil holes with a wire.
•  Reverse guide bar periodically. 
•  Check sprocket and the clutch and clean the bar 
mount area before installation of the bar. 
Replace either or both if worn.
SPROCKET 
•  A damaged sprocket will cause premature dam-
age 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.
CYLINDER FINS
•  Check periodically.
•  Clogged ns will result in poor engine cooling.
•  Remove dirt and dust from between ns to let 
cooling air pass easily.
MUFFLER SPARK ARRESTOR
•  Remove air cleaner cover and remove spark 
plug lead. 
•  Remove spark arrestor screen cover and screen 
from mufer body.
•  Clean carbon deposits from mufer components.
•  Replace screen if it is cracked, or has holes 
burned through.
•  Assemble components in reverse order.
NOTE
Carbon deposits in mufer will cause drop in 
engine output. Spark arrestor screen must be 
checked periodically.
Worn : 0.5 mm (0.020 in.)
Groove
Oil hole
Cylinder ns 
Spark arrestor screen
Mufer
Screen cover
Sprocket










