Bedienungsanleitung Zenoah GZ7000 (Seite 22 von 40) (Englisch)

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WORKING TECHNIQUES

22 – English

7 Take great care when you cut with the top edge of the

bar, i.e. when cutting from the underside of the object.

This is known as cutting on the push stroke. The chain

tries to push the chain saw back towards the user. If

the saw chain is jamming, the saw may be pushed

back at you.

8 Unless the user resists this pushing force there is a

risk that the chain saw will move so far backwards that

only the kickback zone of the bar is in contact with the

tree, which will lead to a kickback.

Cutting with the bottom edge of the bar, i.e. from the

top of the object downwards, is known as cutting on

the pull stroke. In this case the chain saw pulls itself

towards the tree and the front edge of the chain saw

body rests naturally on the trunk when cutting. Cutting

on the pull stroke gives the operator better control

over the chain saw and the position of the kickback

zone.

9 Follow the instructions on sharpening and maintaining

your bar and chain. When you replace the bar and

chain use only combinations that are recommended

by us. See instructions under the headings Cutting

equipment and Technical data.

Basic cutting technique

General

• Always use full throttle when cutting!

• Reduce the speed to idle after every cut (running the

engine for too long at full throttle without any load, i.e.

without any resistance from the chain during cutting,

can lead to serious engine damage).

• Cutting from above = Cutting on the pull stroke.

• Cutting from below = Cutting on the push stroke.

Cutting on the push stroke increases the risk of kickback.

See instructions under the heading How to avoid

kickback.

Terms

Cutting = General term for cutting through wood.

Limbing = Cutting branches off a felled tree.

Splitting = When the object you are cutting breaks off

before the cut is complete.

There are ﬁve important factors you should consider

before making a cut:

1 Make sure the cutting equipment will not jam in the

cut.

2 Make sure the object you are cutting will not split.

3 Make sure the chain will not strike the ground or any

other object during or after cutting.

4 Is there a risk of kickback?

5 Do the conditions and surrounding terrain affect how

safely you can stand and move about?

Two factors decide whether the chain will jam or the object

that you are cutting will split: the ﬁrst is how the object is

supported before and after cutting, and the second is

whether it is in tension.

In most cases you can avoid these problems by cutting in

two stages; from the top and from the bottom. You need to

support the object so that it will not trap the chain or split

during cutting.

The following instructions describe how to handle the

commonest situations you are likely to encounter when

using a chain saw.

WARNING! Never use a chain saw by

holding it with one hand. A chain saw is

not safely controlled with one hand.

Always have a secure, ﬁrm grip around

the handles with both hands.

IMPORTANT! If the chain jams in the cut: stop the

engine! Don’t try to pull the chain saw free. If you do you

may be injured by the chain when the chain saw

suddenly breaks free. Use a lever to open up the cut and

free the chain saw.

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