Husqvarna 317 EL 用户手册

15

A danger zone surrounds the tree to a distance of 

2 1/2 times the height of the tree. See to it that no one is 

 standing within this zone while you are felling the tree.

When felling a tree, one always aims to place it where neither 

objects nor diffi cult terrain will hamper limbing and cutting. 

 Unobstructed movement and secure footing are essential.

It is also important to avoid lodging the tree against  another 

tree. A lodged tree is extremely dangerous.

After determining where you want the tree to fall, you must 

also consider the likely unaided direction of fall. This is 

 affected by the straightness and lean of the tree, wind direc-

tion,  concentration of branches and any snow that may weigh 

the tree down.

After assessing all these factors, you may fi nd you have no 

choice but to fell the tree in its natural direction of fall because 

your preferred direction of fall is likely to fail.

Another important factor affecting your personal safety, though 

it has no bearing on the direction of fall, is the presence of any 

dead branches which could fall while you are felling the tree.

Remove any branches from around 

the base of the tree which may in-

terfere with your work. It is safest to 

work from the top down and to keep 

the tree trunk between you and the 

running chain. Never cut branches 

above shoulder height. Clear under-

growth around the tree and identify 

your line of retreat or escape, taking note of any obstructions 

(stones, branches, holes, etc.).Your line of retreat should be at 

an angle, around 135° behind the direction of fall.

Notch depth should be around 1/4 of the 

diameter of the tree and the angle should 

be around 45°. 

The line defi ned by the inside angle of the 

notch must be precisely horizontal and 

at a precise right angle to the direction 

of fall.

The felling cut is done from the  opposite 

side of the tree and must also be 

 horizontal. Stand with the tree to your left 

and cut with the bottom of the guide bar 

(pulling chain).

Place the FELLING CUT approximately 

3-5 cm (1 1/2 - 2”) above the BOTTOM 

NOTCH CUT. 

Cut at full motor speed, feeding the saw 

slowly into the tree. Watch out for tree 

movement opposite to the intended direc-

tion of fall. Insert a WEDGE or  FELLING 

BAR in the FELLING CUT as soon as the 

depth of the cut permits.

When complete, the FELLING CUT must 

be parallel to the notch and leave a 

strip of HINGE WOOD at least 1/10 the 

 diameter of the tree. 

The HINGE WOOD acts as a hinge, 

 steering the direction of the falling tree. 

If the HINGE WOOD is too small or has 

been sawn through, or if the 

notch and the felling cut are 

mismatched, the tree is no 

 longer under control.

As the felling cut approaches the notch, 

the tree should start falling, either by 

 itself or with the help of a WEDGE or 

FELLING BAR.

Three cuts are made to fell a tree. The «TOP NOTCH CUT» 

and the «BOTTOM» or «HORIZONTAL NOTCH CUT» forms 

the «NOTCH», which determines the direction in which the 

tree will fall. The fi nal cut is the «FELLING CUT», which allows 

the tree to topple over.

To form the NOTCH, start with the TOP 

NOTCH CUT.  

Using the bottom of the 

guide bar (pulling chain), make a 45° 

downward angled cut at right angles to 

the intended direction of fall.

Next do the BOTTOM NOTCH CUT, 

 ensuring that it meets the bottom of the 

TOP NOTCH CUT precisely. 

 Planned Direction of fall 

Danger zone

Retreat

Retreat

Danger zone