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Cylinder Cooling Fins
Maintenance Interval
• The cylinder cooling fins should be cleaned after
every 25 hours of operation, or once a week,
whichever comes first.
• Air must f low freely around and through the
cyli nder cooli ng f i ns to prevent eng i ne
overheating. Leaves, grass, dirt and debris buildup
on the fins will increase the operating temperature
of the engi ne, which can reduce engi ne
performance and shorten engine life.
Cooling Fin Cleaning
1.
With the engine at ambient (room) temperature,
loosen the knob and remove the air filter cover.
Knob
High Tension Lead Boot
Air Filter Cover
Knob
2.
Twist the high tension lead boot on the spark plug
back and forth a couple of times to loosen the
boot, then pull the boot off of the spark plug.
3.
Loosen the knob and lift off the cylinder cover.
4.
Clean all dirt and debris from the cooling fins and
from around the cylinder base.
5.
DO NOT overlook cleaning of the cooling air
intake area below the crankcase and above the
fuel tank! This area must be free of debris and
obstruction for the engine to cool properly.
6.
Reinstall the cylinder cover and the air filter
cover.
Spark Arrester
POTENTIAL HAZARD
• Muffler surface becomes hot when Edger
WHAT CAN HAPPEN
• Contact with hot muffler surfaces could
HOW TO AVOID THE HAZARD
• Make sure the muff ler is cool before
Maintenance Interval
• The spark arrester should be inspected and cleaned
• Replace the screen if it cannot be thoroughly
Cylinder Cover
Spark Arrester Maintenance
1.
2.
Cooling Fins
3.
4.
5.
— US-20 —
WARNING
is in operation and remains hot for some
time after the engine is shut off.
cause a burn.
inspecting and cleaning the spark
arrester.
after every 25 hours of use.
cleaned, or if it is damaged.
With the engine at ambient (room) temperature,
loosen the knob and remove the air filter cover.
Twist the high tension lead boot on the spark plug
back and forth a couple of times to loosen the
boot, then pull the boot off of the spark plug.
Tail
Loosen the knob and lift off the cylinder cover.
Remove and clean the tail, gasket and spark
arrester with a safety solvent and a stiff brush. If
any part cannot be thoroughly cleaned, it must be
replaced.
Reinstall the spark arrester and tail onto the
Spark Arrester
Socket Head Screw
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