Manual Stiga SPR 255 (page 34 of 508) (All languages)

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This results in an increased risk of injury due to:

• not having a rm grip on the saw if it kicks back;

• a lack of control of the saw such that it is mo re liable to

contact climbing lines and operators body (particularly

the left hand and arm)

• losing control from insecure work position re sul ting in

contact with the saw (unexpected mo vement during

operation of the saw).

Securing the work position for two-handed use

To allow the operator to hold the saw with both hands,

they should as general rule, aim for se cur e work position

where they are operating the saw at:

• hip level when cutting horizontal sections;

• solar plexus level when cutting vertical sections.

Where the operator is working close into vertical stems

with a low lateral forces on their work position, then a good

footing may be all that is needed to maintain a secure

work position.

However as operators mo ve

away from the stem, they will

need to ta ke steps to remove

or count er act the increasing

la teral forces by, for ex am ple,

a re-direct of the main line via

a supplementary anchor point

or using an adjustable strop

direct from the harness to a

supplementary an chor point.

Gaining a good footing at the

working position can be as-

sisted by use of a temporary

foot stirrup crea ted from an

endless sling.

Starting the saw in the tree

When starting the saw in the tree, the operator should:

a) apply the chain brake before starting;

b) hold saw on either the left or right of the body when

starting:

1) on the left side hold the saw with either the left hand

on the front handle or the right hand on the rear handle

and thrust the saw away from the body while holding

the pull starter cord in the other hand;

2) on the right side, hold the saw with the right hand on

either handle and thrust the saw a way from the body

while holding the pull star ter cord in the left hand.

The chain brake should always be engaged before lower-

ing a running saw onto its strop. Operators should always

check the saw has sucient fuel before undertaking criti-

cal cuts.

One-hand use of the chainsaw

Operators should not use tree service chainsaws one-

handed in place of unstable work positioning or in prefer-

ence to a handsaw when cutting small diameter wood at

the branch tips.

Tree service chainsaws should only be used one-handed

where:

• the operator cannot

gain a work position

enabling two han ded

use; and

• they need to support

their working po sition

with one hand; and the

saw is being used at full

stretch, at right angles

to and out of line with

the operator’s body.

Operators should never:

• cut with the kickback zone at the tip of the chainsaw

guide bar

• “hold and cut” sections

• attempt to catch falling sections.

Freeing a trapped saw

If the saw should become trapped during cutting, opera-

tors should:

• switch o the saw and attach it securely to the tree

inboard (i.e. towards the truck side) of the cut or to a

separate tool line;

• pull the saw from the kerf whilst lifting the branch as

necessary;

• if necessary, use a handsaw or second chain saw to

release the trapped saw by cutting a mi nimum of 30 cm

away from the trapped saw.

Whether a handsaw or a chainsaw is used to free a stuck

saw, the release cuts should always be outboard (toward

the tips of the branch), in order to prevent the saw be-

ing taken with the section and further complicating the

situation.

8 SAFETY REQUIREMENTS

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Stiga SPR 255 Manual

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