Sharpening Of The Chain Blade - Hitachi CS 30SB Instrucciones De Manejo

(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 front 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 lumbar. Using the
spike as a fulcrum, cut into the wood by turning the rear
handle to the right. (Fig. 21)
(5) When cutting into wood from the bottom, touch the
upper part of the guide bar to the wood lightly. (Fig. 22)
(6) As well as carefully studying the handling instructions,
ensure practical instruction in the operation of the chain
saw prior to use, or at least 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 by immobilizing them during
cutting using a sawing trestle or other proper method.
CAUTION
○ When cutting wood from the bottom, there is a danger
that the unit body may be pushed back toward the user
if the chain strongly impacts with the wood.
○ Do not cut all the way thorough the wood by starting
from the bottom since there is the danger of the guide
bar fl ying up out of control when the cut is fi nished.
○ 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. 23)
CAUTION
○ Always be careful to avoid falling branches.
○ 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, fi rst cut in about
half of the way from above, then cut the branch off from
below. (Fig. 24)
CAUTION
○ When cutting off branches which touch the ground, be
careful that the guide bar does not become bound by
pressure.
○ During the fi nal cutting stage, beware of the log
suddenly rolling.
3. Log cutting
When cutting a log positioned as shown in Fig. 25, fi rst
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. 26, fi rst cut in about
two thirds of the way from above, then cut upward from
below.
CAUTION
○ Ensure the guide bar does not become bound in the log
by pressure.
○ 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 ( as shown in Fig. 27):
Make undercut facing the direction in which you want
the tree to fall.
The depth of the undercut should be 1/3 of the tree's
diameter. Never fell trees without proper undercut.
(2) Back cut ( as shown in Fig. 27):
Make a backcut about 5 cm above and parallel to the
horizontal undercut.
If the chain becomes entangled during cutting, stop the
saw and use wedges to free it. Do not cut thorough the
tree.
CAUTION
○ Trees should not be felled in a manner that would
endanger any person, strike any utility line or cause
any property damage.
○ 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.
Precaution for cutting work
Gripping/pushing force of chain saw
Always grip the chain saw securely.
In addition, do not force the chain saw more than
necessary. When cutting, additional force exerted on
the chain saw will not accelerate the cutting speed.
This will strain the motor, impair the performance, and
damage or cause malfunction of the motor or guide bar.
Use the unit in the range where the saw chain is at a
reasonable speed.
In particular, when the saw chain stops (becomes
jammed) due to the excessive force, it may cause an
injury or failure of the unit.
Chain catcher
○ The chain catcher is located on the power head just
below the chain to further prevent the possibility of a
broken chain striking the chain saw user.
○ When the saw chain is cut, replace it with a new one
referring to "Installing (replacing) saw chain".

SHARPENING OF THE CHAIN BLADE

WARNING
To prevent accidents, always turn off the switch and
disconnect the plug from the receptacle.
In addition, when using saw chains, always wear thick
gloves.
NOTE
Sharpen the saw chain and adjust the depth gage at
the central position on the guide bar, with the saw chain
attached to the main body.
When the sharpness of saw chains deteriorates, the motor
and each part of the body are burdened and the effi ciency
declines.
For optimal performance of the unit, frequent maintenance
is necessary to keep the saw chain sharp.
1. Blade sharpening
The accessory round fi le should be held against the
chain blade so that one-fi fth of its diameter extends
above the top of the blade, as shown in Fig. 28.
Sharpen the blades by keeping the round fi le at a 30°
angle in relation to the guide bar, as shown in Fig. 29,
ensuring that the round fi le is held straight, as shown
in Fig. 30. Ensure that all saw blades are fi led at the
same angle, or the cutting effi ciency of the tool will
be impaired. Appropriate angles for sharpening the
blades correctly are shown in Fig. 31.
2. Adjustment of depth gage
WARNING
○ Do not sand the top part of the bumper tie strap and
guard drive link, nor cause the shape of said parts to
deform.
○ Adjustment of depth gages must be in line with the
predetermined dimensions and shapes, otherwise the
risk of kickback may increase, causing an injury.
Bumper tie strap
11
English
Guard drive link