23
P
OWER
B
LOWER
O
PERATOR
'
S
M
ANUAL
COOLING
SYSTEM
Level 2.
Tools required:
25 - 50 mm (1 - 2 in.) medium bristle paint brush,
Torx L-Wrench T27
Parts Required:
None, if you are careful.
IMPORTANT
To maintain proper engine operating temperatures, cooling air must
pass freely through the cylinder fin area. This flow of air carries
combustion heat away from the engine.
Overheating and engine seizure can occur when:
• Air intakes are blocked, preventing cooling air from reaching the
cylinder.
• Dust and grass build up on the outside of the cylinder. This build up
insulates the engine and prevents the heat from leaving.
Removal of cooling passage blockages or cleaning of cooling fins is
considered “Normal Maintenance”. Any failure attributed to lack of
maintenance is not warranted.
Cleaning Grill
1. Remove accumulated debris from intake grill between backpack
frame and blower housing.
Cleaning Cylinder Fins
1. Remove air filter cover.
2. Remove spark plug lead from spark plug, and remove engine
cover.
3. Clean cylinder fins (A) to allow cooling air to pass freely.
4. Install engine cover and attach spark plug lead.
5. Install air filter cover.
A
Summary of Contents for PB-770H
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