To Avoid Pull-In; To Avoid Pushback; Cutting Techniques; Felling - Stihl 9 Instruction Manual

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Pull-in occurs when the chain on the
bottom of the bar is suddenly stopped
when it is pinched, caught or encounters
a foreign object in the wood. The reaction
of the chain pulls the saw forward and
may cause the operator to lose control.
Pull-in frequently occurs when the
bumper spike of the saw is not held
securely against the tree or limb and
when the chain is not rotating at full
speed before it contacts the wood.
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Use extreme caution when cutting small
size brush and saplings which may easily
catch the chain and pull you off balance.
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1. Always start a cut with the chain
rotating at full speed and the bumper
spike in contact with the wood.
2. Pull-in may also be prevented by using
wedges to open the kerf or cut.
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Pushback occurs when the chain on the
top of the bar is suddenly stopped when
it is pinched, caught or encounters a
foreign object in the wood. The reaction
of the chain drives the saw straight back
toward the operator and may cause loss
of saw control. Pushback frequently
occurs when the top of the bar is used for
cutting.
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1. Be alert to forces or situations that
may cause material to pinch the top
of the chain.
2. Do not cut more than one log at a time.
3. Do not twist the saw when
withdrawing the bar from a plunge
cut or underbuck cut because the
chain can pinch.
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Felling is cutting down a tree.
Before felling a tree, consider carefully all
conditions which may affect the direction
of fall, including:
The intended direction of the fall.
The natural lean of the tree.
Any unusually heavy limb structure.
Surrounding trees and obstacles.
The wind direction and speed.
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Always observe the general condition of
the tree. Inexperienced users should
never attempt to cut trees which are
decayed or rotted inside or which are
leaning or otherwise under tension.
There is an increased risk that such trees
could snap or split while being cut and
cause serious or fatal injury to the
operator or bystanders. Also look for
broken or dead branches which could
vibrate loose and fall on the operator.
When felling on a slope, the operator
should stand on the uphill side if
possible.