Kickback; Pull-In; Pushback - Stihl HTA 66 Notice D'emploi

English

– Pull-in

– Pushback

7.2

Kickback

7.2.1 Kickback
WARNING
￭ Kickback may occur when the moving chain near the
upper quadrant of the bar nose contacts a solid object or
is pinched.
￭ When this occurs, the energy driving the chain can create
a force that moves the pole pruner in a direction opposite
to the chain movement at the point where the chain is
slowed or stopped. This may cause the bar to move
upward.
7.2.2 To Avoid Kickback
The best protection from personal injury that may result from
kickback is to avoid kickback situations:
1) Be aware of the location of the guide bar nose at all times.
2) Never let the nose of the guide bar contact any object. Do
not cut limbs with the nose of the guide bar. Be especially
careful near wire fences and when cutting small, tough
limbs, which may easily catch the chain.
3) Cut only one limb at a time.
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7 Kickback and Other Reactive Forces
7.3 Pull-in
WARNING
￭ Pull-in occurs when the chain on the bottom of the bar is
suddenly stopped or significantly slowed when it is
pinched, caught or encounters a foreign object in the
wood. The reaction of the chain pulls the pole pruner
forward.
￭ Pull-in usually occurs when the chain is not rotating at full
speed before it contacts the wood.
￭ To reduce the risk of pull-in:
– Be alert to forces or situations that may cause
material to pinch the chain at the bottom of the bar.
– Always start a cut with the chain rotating at full
speed.
7.4 Pushback
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