Echo CS-310 Operator's Manual page 16

DESCRIPTION
5. Mount guide bar on studs (C) and slide toward sprocket (E) to
make saw chain installation easier. Install chain with cutters on
top of guide bar facing forward.
6. Install the sprocket guard over the guide bar studs. Ensure
chain tension adjuster pin (F) fits into the guide bar adjuster
hole (D). Tighten sprocket guard nuts finger tight.
7. Adjust saw chain tension, as instructed in "Adjustment, Chain
Tension".
16
E
F
B
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CS-310
C
D
A