Manual Dolmar PS-400 (page 10 of 64) (English, French)

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Position the chain saw in such a way that your body is

clear of the cutting attachment whenever the engine

is running (fig. 10).

Don’t put pressure on the saw when reaching the end

of a cut. The pressure may cause the bar and rotating

chain to pop out of the cut or kerf, go out of control and

strike the operator or some other object. If the rotating

chain strikes some other object a reactive force (see

pages 11 to 13 ) may cause the chain to strike the

operator.

Reactive forces during the cut, including kickback

WARNING!

Reactive forces, that may occur during any cut are

kickback, pushback and pull-in. Reactive forces

can be dangerous! In any chain saw, the powerful

force used to cut wood can be reversed (and work

against the operator).

If the rotating chain is suddenly stopped by contact

with any solid object like a log or branch or is

pinched, the reactive forces instantly occur. These

reactive forces may result in loss of control which

may, in turn, cause serious or fatal injury. An

understanding of the causes of these reactive

forces may help you avoid loss of control.

The most common reactive forces are

- kickback,

- pushback,

- pull-in.

In order to keep control of your saw, always maintain

a firm foothold. Never work on a ladder, in a tree or on

any other insecure support. Never use the saw above

shoulder height (fig. 9).

This reaction can occur in a fraction of a second and

under some circumstances, cause the guide bar and

chain to strike the operator with enough force to cause

severe or fatal injury. It may also occur during limbing.

It also occurs when the nose of the guide bar is pinched

unexpectedly, unintentionally contacts solid material

in the wood (fig.12) or is incorrectly used to begin

a plunge or boring cut.

The greater the force of the kickback reaction, the

more difficult it becomes for the operator to control the

saw.

Kickback:

Kickback occurs when the upper quadrant of the bar

nose contacts a solid object in the wood or is pinched

(fig. 11). The reaction of the cutting force of the chain

causes a rotational force of the chain saw in the direc

tion opposite to the chain movement, mainly in the

plane of the bar. This may fling the bar in an uncon-

trolled arc towards the operator.

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Dolmar PS-400 Manual

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