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7
the adjusting screw clockwise, and slackened by
turning it counterclockwise.
3. The chain tension must be adjusted so that a 0.5–
1.0 mm gap appears between the chain drive links
and the guide bar when the chain is lightly raised
at the center section of the guide bar as shown in
Fig. 3.
4. When chain tension adjustment is completed,
retighten the bolt securing the chain cover.
CAUTION
Due to the sharpness of the chain, protect your
hands when checking the tension or servicing.
CUTTING PROCEDURES
1. General cutting procedures
(1) Switch ON the power while keeping the saw slightly
away from the wood to be cut. Start sawing only
after the unit has reached full speed.
(2) When sawing the slender piece of wood, press the
base section of the guide bar against the wood and
saw downward as shown in Fig. 4.
(3) When sawing a thick piece of wood, press the spike
on the front section of the unit against the wood
and cut it with lever action while using the spike
as a fulcrum as shown in Fig. 5.
(4) When cutting wood horizontally, turn the unit body
to the right so that the guide bar is below and hold
the upper side of the side handle with your left
hand. Hold the guide bar horizontally and place the
spike that is on the front of the unit body on the
lumber. Using the spike as a fulcrum, cut into the
wood by turning the handle to the right. (Fig. 6)
(5) When cutting into wood from the bottom, touch the
upper part of the guide bar to the wood lightly.
(Fig. 7)
(6) In addition of careful study of the handling
instructions, take practical instruction in the operation
of the chain saw prior to use, or at least to practice
working with the chain saw by cutting lengths of
round timber on a sawing trestle.
(7) When cutting logs or timbers which are not
supported, support them properly not to move
during cutting by a sawing trestle or another proper
methods.
CAUTIONS
⅜ When cutting wood from the bottom, there is the
danger that the unit body may pushed back toward
the user if the chain strongly hits the wood.
⅜ Do not cut all the way through the wood by starting
from the bottom since there is the danger of the
guide bar flying up out of control when the cut is
finished.
⅜ Always prevent the operating chain saw from
touching the ground or wire fences.
2. Branch cutting
(1) Cutting branches from a standing tree:
A thick branch should initially be cut off at a point
away from the trunk of the tree.
First cut in about one third of the way from below,
and then cut off the branch from above. Finally, cut
off the remaining portion of the branch even with
the trunk of the tree. (Fig. 8)
CAUTIONS
⅜ Always be careful to avoid falling branches.
⅜ Always be alert for chain saw recoil.
(2) Cutting branches from fallen trees:
First cut off branches that do not touch the ground,
then cut off those which touch the ground. When
cutting thick branches that touch the ground, first
cut in about half of the way from above, then cut
the branch off from below. (Fig. 9)
CAUTIONS
⅜ When cutting off branches which touch the ground,
be careful that the guide bar does not become
bound by pressure.
⅜ In the final stage of cutting, beware of the log
suddenly rolling.
3. Log cutting
When cutting a log positioned as shown in Fig. 10,
first cut in about one third of the way from below,
then cut down all the way from above.
When cutting a log that straddles a hollow as shown
in Fig. 11, first cut in about two thirds of the way
from above, then cut upward from below.
CAUTIONS
⅜ Be careful that the guide bar does not become
bound in the log by pressure.
⅜ When working on inclined ground, be sure to stand
on the uphill side of the log. If you stand on the
downhill side, the cut-off log may roll toward you.
4. Felling trees:
(1) Undercut (q as shown in Fig. 12):
Make undercut facing direction which you want tree
to fall.
Depth of undercut should be 1/3 of tree’s diameter.
Never fell trees without proper undercut.
(2) Backcut (w as shown in Fig. 12):
Make backcut about 5 cm above and parallel to the
horizontal undercut.
If the chain is bound during cutting, stop the saw
and use wedges to free form it. Do not cut through
the tree.
CAUTIONS
⅜ Trees should not be felled in a manner that would
endanger any person, strike any utility line or cause
any property damage.
⅜ Be sure to stand on the uphill side of the terrain
as the tree is likely to roll or slide downhill after
it is felled.
SHARPENING OF CHAIN BLADE
CAUTION
Ensure the power source has been disconnected from
the tool before performing the steps below. Wear
gloves to protect your hands.
Dull and worn chain blades will decrease the efficiency
of the tool and place unnecessary overload on the
motor and various parts of the machine. In order to
maintain optimum efficiency, it is necessary to check
the chain blades often and keep them properly
sharpened and adjusted. Blade sharpening and depth
gauge adjustment should be accomplished at the
center of the guide bar with the chain properly mounted
to the machine.