Husqvarna 140E TRIOBRAKE 用户手册

24 – English

1154580-38 Rev.1 2011-12-05

Make the felling cut about 3-5 cm (1.5-2 inches) above the 
bottom directional cut. (74)

Set the spike bumper (if one is fitted) just behind the felling 
hinge. Use full throttle and advance the chain/bar slowly 
into the tree. Make sure the tree does not start to move in 
the opposite direction to your intended felling direction. 
Drive a wedge or breaking bar into the cut as soon as it is 
deep enough.

Finish the felling cut parallel with the directional cut line so 
that the distance between them is at least 1/10 of the 
trunk diameter. The uncut section of the trunk is called the 
felling hinge.

The felling hinge controls the direction that the tree falls in. 
(75)

All control over the felling direction is lost if the felling 
hinge is too narrow or non-existent, or if the directional 
cuts and felling cut are badly placed. (76)

When the felling cut and directional cut are complete the 
tree should start to fall by itself or with the aid of a felling 
wedge or breaking bar. (77)

We recommend that you use a bar that is longer than the 
diameter of the tree, so that you can make the felling cut 
and directional cuts with single cutting strokes. See 
instructions under the heading Technical data section to 
find out which lengths of bar are recommended for your 
saw.

There are methods for felling trees with a diameter larger 
than the bar length. However these methods involve a 
much greater risk that the kickback zone of the bar will 
come into contact with the tree. (4)

It is very dangerous to remove a trapped tree and there is 
high accident risk.

Never try to fell the tree that is trapped.

Never work in the risk zone of the hanging trapped tree. 
(78)

The safest method is to use a winch.

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Tractor-mounted

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Portable

Preparations: Work out which side is in tension and where 
the point of maximum tension is (i.e. where it would break 
if it was bent even more). (79)

Decide which is the safest way to release the tension and 
whether you are able to do it safely. In complicated 
situations the only safe method is to put aside your chain 
saw and use a winch.

Position yourself so that you will be clear of the tree or 
branch when the tension is released. (80)

Make one or more cuts at or near the point of maximum 
tension. Make as many cuts of sufficient depth as 

necessary to reduce the tension and make the tree or 
branch break at the point of maximum tension. (81)

If you must cut across tree/limb, make two to three cuts, 
one inch apart, one to two inches deep. (82)

Continue to cut deeper until tree/limb bends and tension 
is released. (83)

Cut tree/limb from outside the bend, after tension has 
been released.

The word kickback is used to describe the sudden 
reaction that causes the chain saw and bar to jump off an 
object when the upper quadrant of the tip of the bar, 
known as the kickback zone, touches an object. (56)

Kickback always occurs in the cutting plane of the bar. 
Normally the chain saw and bar are thrown backwards 
and upwards towards the user. However, the chain saw 
may move in a different direction depending on the way it 
was being used when the kickback zone of the bar 
touched the object. (8)

Kickback only occurs if the kickback zone of the bar 
touches an object. (4)

Make sure that you can stand and move about safely. 
Work on the left side of the trunk. Work as close as 
possible to the chain saw for maximum control. If possible, 
let the weight of the chain saw rest on the trunk.

Keep the trunk between you and the chain saw as you 
move along the trunk.

See instructions under the heading Basic cutting 
technique.