Manual Hitachi CS40SB (page 11 of 244) (All languages)

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(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

Guard drive link

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Hitachi CS40SB Manual

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