Makita EA3600F Owner's Manual page 10

WARNING!
Be extremely careful with partially fallen trees which are poorly
supported.
When the tree hangs or for some other reason does not fall
completely, set the saw aside and pull the tree down with a cable
winch, block and tackle or tractor. If you try to cut it down with your
saw, you may be injured.
Sectioning Method
WARNING!
Felling a tree that has a diameter greater than the length of the
guide bar requires use of either the sectioning or plunge-cut
method. These methods are extremely dangerous because they
involve the use of the nose of the guide bar and can result in
kickback. Only properly trained professionals should attempt these
techniques.
For the sectioning method (Fig. 24) make the first cut with the guide
bar fanning in toward the hinge. Then, using the spike bumper as a
pivot, reposition the saw for the next cut. Avoid repositioning the saw
more than necessary. When repositioning for the next cut, keep the
guide bar fully engaged in the kerf to keep the felling cut straight. If
the saw begins to pinch, insert a wedge to open the cut. On the last
cut, do not cut the hinge.
Plunge-Cut Method
Timber having a diameter more than twice the length of the guide bar
requires the use of the plunge-cut method before making the felling
cut.
First, cut a large, wide notch. Make a plunge cut in the center of the
notch.
The plunge cut is made with the guide bar nose. Begin the plunge cut
by applying the lower portion of the guide bar nose to the tree at an
angle (Fig. 25). Cut until depth of the kerf is about the same as the
width of the guide bar (Fig. 25). Next, align the saw in the direction in
which the recess is to be cut. With the saw at full throttle, insert the
guide bar in the trunk (Fig. 26).
Enlarge the plunge cut as shown in illustration (Fig. 27)
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There is an extreme danger of kickback at this point.
Extra caution must be taken to maintain control of the saw. To
make the felling cut, follow the sectioning method described
previously (Fig. 28). If you are inexperienced with a chain saw
plunge-cutting should not be attempted. Seek the help of a
professional.
Limbing
Limbing is removing the branches from a fallen tree.
Do not attempt a pruning or limbing operation in a standing tree
unless specifically trained to do so.
There is an extreme danger of kickback during the limbing
operation. Do not work with the nose of the bar. Be extremely
cautious and avoid contacting the log or other limbs with the nose
of the guide bar. Do not stand on a log while limbing it - you may
slip or the log may roll.
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WARNING!
WARNING!
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