How To Avoid Kickback; What Is Kickback - RedMax GZ380 Manual De Instrucciones

WORKING TECHNIQUES
Finish the felling cut parallel with the direc-
tional cut line so that the distance between
them is at least 1/10 of the trunk diameter.
The uncut section of the trunk is called the
felling hinge.
The felling hinge controls the direction that
the tree falls in. (42)
All control over the felling direction is lost if
the felling hinge is too narrow or non- -exis-
tent, or if the directional cuts and felling cut
are badly placed.
When the felling cut and directional cut are
complete the tree should start to fall by it-
self or with the aid of a felling wedge or
breaking bar.
We recommend that you use a bar that is
longer than the diameter of the tree, so that
you can make the felling cut and direction-
al cuts with single cutting strokes. See in-
structions under the heading Technical
data section to find out which lengths of
bar are recommended for your saw.
There are methods for felling trees with a
diameter larger than the bar length. How-
ever these methods involve a much great-
er risk that the kickback zone of the bar
will come into contact with the tree.
Freeing a tree that has fallen badly
Freeing a "trapped tree"
It is very dangerous to remove a trapped
tree and there is high accident risk.
Never try to fell the tree that is trapped.
Never work in the risk zone of the hanging
trapped tree.
The safest method is to use a winch.
S Tractor mounted
S Portable
Cutting trees and branches that are in
tension
Preparations: Work out which side is in
tension and where the point of maximum
tension is (i.e. where it would break if it
was bent even more).
Decide which is the safest way to release
the tension and whether you are able to do
it safely. In complicated situations the only
safe method is to put aside your chain saw
and use a winch.
General advice:
Position yourself so that you will be clear
of the tree or branch when the tension is
released.
Make one or more cuts at or near the point
of maximum tension. Make as many cuts
of sufficient depth as necessary to reduce
the tension and make the tree or branch
break at the point of maximum tension.
Never cut straight through a tree or
branch that is in tension!
115391326 Rev. 3 1/31/11
If you must cut across tree/limb, make two
to three cuts, one inch apart, one to two
inches deep.
Continue to cut deeper until tree/limb
bends and tension is released.
Cut tree/limb from outside the bend, after
tension has been released.

How to avoid kickback

WARNING:
Kickback can hap-
pen very suddenly and violently;
kicking the chain saw, bar and
chain back at the user. If this hap-
pens when the chain is moving it
can cause very serious, even fatal
injuries. It is vital you understand
what causes kickback and that you
can avoid it by taking care and us-
ing the right working technique.

What is kickback?

The word kickback is used to describe the
sudden reaction that causes the chain saw
and bar to jump off an object when the up-
per quadrant of the tip of the bar, known as
the kickback zone, touches an object. (43)
Kickback always occurs in the cutting
plane of the bar. Normally the chain saw
and bar are thrown backwards and up-
wards towards the user. However, the
chain saw may move in a different direc-
tion depending on the way it was being
used when the kickback zone of the bar
touched the object.
Kickback only occurs if the kickback zone
of the bar touches an object. (44)
Limbing
WARNING:
A majority of kick-
back accidents occur during limb-
ing. Do not use the kickback zone
of the guide bar. Be extremely
cautious and avoid contacting the
log, other limbs or objects with the
nose of the guide bar. Be extremely
cautious of limbs under tension.
They can spring back toward you
and cause loss of control resulting
in injury.
Make sure that you can stand and move
about safely. Work on the left side of the
trunk. Work as close as possible to the
chain saw for maximum control. If pos-
sible, let the weight of the chain saw rest
on the trunk.
Keep the trunk between you and the chain
saw as you move along the trunk.
Cutting the trunk into logs
See instructions under the heading Basic
cutting technique.
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