12
13
Never saw completely through the trunk. Always leave a hinge (F). The hinge guides
the tree. If the trunk is completely cut through, control over the felling direction
is lost. Insert a wedge or felling lever in the cut (D) well before the tree becomes
unstable and starts to move. This will prevent the guide bar from binding in felling
cut if you have misjudged the falling direction. Make sure no bystanders have
entered the range of the falling tree before you push it over.
Warning:
animals, and/or obstacles.
1. Use wooden or plastic
wedges (A) to prevent
binding the bar or chain (B)
in the cut (Fig. 8)
2. When diameter of wood being cut is
greater than the bar length, make 2
cuts as shown (Fig. 9).
Warning:
As the felling cut (D) gets close to the hinge (F), the tree should
begin to fall. Remove saw from cut, stop the engine, put the chainsaw down and
leave the area by the retreat path (Fig. 6).
• LIMBING
Limbing a tree is the process of removing
the branches from a fallen tree(Fig.10).
Do not remove supporting limbs (A).
Branches under tension should be cut
from the bottom up to avoid binding the
chainsaw.
Warning:
Never cut tree limbs while standing on tree trunk.
OPERATION (Cont.)
OPERATION (Cont.)
Fig.8
Fig.9
•BUCKING
Bucking is cutting a fallen log into lengths. Make sure that you have a good footing
and stand uphill of the log when cutting on sloping ground. If possible, the log
should be supported so that the end to be cut off is not resting on the ground. If the
log is supported at both ends and you must cut in the middle, make a downward cut
halfway through the log and then make the undercut. This will prevent the log from
pinching the bar and chain. Be careful that the chain does not cut into the ground
when bucking as this causes rapid dulling of the chain.
1. Log supported along entire length: cut from bottom (under buck), being careful to
avoid cutting into the ground (Fig.11).
2. Log supported on 1 end proceed as if using a saw-horse: First, cut from bottom
(under buck) 1/3 diameter of log to avoid splintering. Second, cut from above (over
3. Log supported on both ends: First, over buck 1/3 diameter of log to avoid
Note:
The best way to hold a log while bucking is to use a saw horse. When this
is not possible, the log should be raised and supported by limb stumps or by using
supporting logs. Be sure the log being cut is securely supported.
BUCKING USING
A SAWHORSE (Fig.13)
hands and keep the saw to the
right of your body while cutting.
2. Keep the left arm as straight
as possible.
3. Keep weight on both feet.
Fig.10
Fig.11
Fig.12
Fig.13
buck) to meet first cut and avoid pinching.
splintering. Second, under buck to meet first cut and avoid pinching(Fig.12).
Summary of Contents for YT4997
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