Manual Stihl HT 103 (page 13 of 96) (English, Spanish)

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HT 102, HT 103, HT 132, HT 133

English

muffler maintained by a STIHL servicing

dealer. Some state or federal laws or

regulations may require a properly

maintained spark arrestor for certain

uses. See the "Maintenance, Repair and

Storing" section of these Safety

Precautions. Remember that the risk of

a brush or forest fire is greater in hot or

dry conditions.

Reactive Forces

WARNING

Reactive forces may occur any time the

chain is rotating.The 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 such as a branch or is

pinched, the reactive forces may occur

instantly. These reactive forces may

result in loss of control, which, in turn,

may cause personal injury. An

understanding of the causes of these

reactive forces may help you avoid the

element of surprise and loss of control.

Because of the design of the pole

pruner, the reactive forces experienced

when working with it are generally not as

severe as those encountered with a

chainsaw. Nevertheless, you should

always maintain a proper grip and good

footing to control the power tool when

you experience such forces.

The most common reactive forces are:

– kickback,

– pushback,

– pull-in.

Kickback

Kickback may occur when the moving

saw chain near the upper quadrant of

the bar nose contacts a solid object or is

pinched.

The reaction of the cutting force of the

chain causes a rotational force on the

pole pruner in the direction opposite to

the chain movement. This may cause

the bar to move upward.

To Avoid Kickback

The best protection from kickback is to

avoid kickback situations:

1. Be aware of the location of the guide

bar nose at all times.

2. Never let the nose of the guide bar

contact any object. Do not cut limbs

with the nose of the guide bar. Be

especially careful near wire fences

and when cutting small, tough

limbs, which may easily catch the

chain.

3. Cut only one limb at a time.

A = Pull-in

Pull-in occurs when the chain on the

bottom of the bar is suddenly stopped

when it is pinched, caught or encounters

a foreign object in the wood. The

reaction of the chain pulls the pole

pruner forward.

Pull-in frequently occurs when the chain

is not rotating at full speed before it

contacts the wood.

To Avoid Pull-in

1. Be alert to forces or situations that

may cause material to pinch the

chain at the bottom of the bar.

2. Always start a cut with the chain

rotating at full speed.

B = Pushback

Pushback occurs when the chain on the

top of the bar is suddenly stopped when

it is pinched, caught or encounters a

foreign object in the wood. The reaction

of the chain may drive the pole pruner

rapidly straight back toward the

002BA230 KN

001BA037 KN

001BA038 KN

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Stihl HT 103 Manual

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