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© 4/2013 ECHO Inc.
MAINTENANCE PB-770 H/T
Cleaning Cylinder Fins
1. Disconnect spark plug lead from spark plug.
2. Remove air filter cover.
3. Remove engine cover
4. Clean cylinder fins (A) to allow cooling air to pass freely
5. Install engine cover
6. Install air filter cover.
7. Connect spark plug lead.
Exhaust System
Spark Arrestor Screen
Level 2.
Carbon deposits in muffler will cause a drop in engine output and overheating. Spark arrestor screen must
be checked periodically.
1. Disconnect spark plug lead from spark plug
2. Remove spark arrestor cover (A), gasket (B) and spark
arrestor screen (C) from muffler. Replace screen if plugged
with carbon deposits
Note: When cleaning carbon deposits, be careful not to damage
the catalytic element inside muffler.
3. Install spark arrestor screen, gaskets, and cover.
4. Connect spark plug lead.
Exhaust Port Cleaning
Level 2.
1. Remove spark plug lead from spark plug, and remove
engine cover.
2. Place piston at top dead center. Remove muffler (A) and
muffler gasket (B).
3. Use a wood or plastic scraping tool to clean deposits from
cylinder exhaust port.
Parts Required: Spark Arrestor Screen, Gasket
Parts Required: As needed: Muffler Gasket
A
C
B
A
A
B