Echo CS-303T Operator's Manual page 24

DESCRIPTION
7. Turn saw over and visually
check Brake Band (J) for
correct position around Clutch
Drum (K). If Brake Band is not
in place around Clutch Drum,
remove Sprocket Guard (B) and
reinstall. Tighten Sprocket
Guard Nuts (A) finger tight.
Improper sprocket guard assembly can result in serious injury,
and will cause severe saw damage if unit is started. Never start
or operate saw if brake band is not in place on clutch drum.
Always check chain brake operation after replacing guard. Do
not use saw if chain brake does not function properly.
8. Adjust saw chain tension, as instructed in "Adjustment, Chain Tension".
Adjusting Chain Tension
Always loosen sprocket guard nuts before turning the chain tension
adjuster, otherwise the sprocket guard and tensioner will be
damaged.
1. Disconnect spark plug lead.
2. Loosen Sprocket Guard Nuts
(A).
24
J
K
A
B
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CS-303T
X7503209108