Echo CS-310 Instruction Manual page 21

Uphill position
Finish cut
First cut
Board or flat stones
LIMBING
Limbing a fallen tree is much the same as bucking.
Never stand on the tree that you are limbing.
When limbing, caution is the word.
Be careful of the tip touching other limbs.
Always use both hands.
Don't cut with the saw overhead or aligned vertically with your
body. If the saw should kickback, you may not have enough
control to prevent possible injury.
BUCKING
Bucking is the sawing of a log or fallen tree into smaller
pieces. There are a few basic rules which apply to all
bucking operations. Keep both hands on the handles at all
times. Support logs if possible.
When cutting on a slope or hillside, always stand uphill.
Keep in mind that the wood is heavy and that it will bend
and pinch the saw if improperly supported. The trunk
will weaken at the point where you make the cut unless
the tree is lying on perfectly flat ground or supported as
shown. If you make the cut with the tree on the ground,
don't let the saw's chain dig into the earth; it is harmful for
the saw, and you stand a good chance of being struck by
flying debris.
To cut the trunk, use the bucking and two-cut sequence
shown. The first cut should be no deeper than one-third the
trunk diameter.
WARNING
KICKBACK IS DANGEROUS
Kickback is generated when the rotation of the
chain is arrested for some reason. The most
dangerous effect of this action occurs when the
nose of the bar contacts another object, the chain
is momentarily stopped and all the energy of the
engine throws the bar upwards and backwards
towards the operator.
The chain saw industry and government agen-
cies have attempted to prescribe various safety
devices, but the best protection is to avoid
kickback.
Comply with the Safety Precautions as listed in
this manual.
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CS-310