Cooling System; Exhaust System - Echo PB-620H Operator's Manual

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coolIng system

Level 2.
Tools required: 25 - 50 mm (1 - 2 in.) cleaning brush, cross head
screwdriver
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. Disconnect spark plug lead (A), and pull lead out of upper cover
clamp and lower cover clamp.
2. Remove 5 screws and remove engine cover (B).
3. Clean cylinder fins (C) to allow cooling air to pass freely.

exhaust system

Spark Arrestor Screen
Level 2.
Tools required: Cross head screwdriver, soft metal brush
Parts Required: Spark arrestor screen, Gaskets (3)
A
B
C