STIGA SPR 500 AE 278420008/ST1 - Инструкция по эксплуатации - Страница 181

EN - 11

–

to have been specifically trained 

to use this type of equipment;

–

to have carefully read the safety 

regulations and user instructions 

contained in this manual;

–

you practise first on logs on the ground 

or attached to trestles, in order to 

get familiar with the machine and the 

most suitable cutting techniques.

To use the machine proceed as follows:

• 

Always disengage the chain brake, pulling the 

lever towards you before using the throttle.

• 

The machine must always be firmly held in 

both hands, 

with the left hand on the front 

hand grip and the right hand on the rear hand 

grip, even if the operator is left-handed.

  Stop the machine immediately 

if the chain stops during sawing.

 NOTE 

  During use, the battery is 

protected against total drainage with a 

protective device that switches off the 

machine and stops it from working.

 6.5.1 

Checks to be conducted 

whilst working

6.5.1.a 

Checking the chain tension

The chain tends to stretch gradually 

as you work, so you need to check its 

tension frequently (par. 6.1.3).

6.5.1.b 

Checking the oil delivery

 IMPORTANT 

   Never use the 

machine without lubrication!

 Make sure the bar and the chain are 

in place when you check the oil delivery.

Start the motor (par. 6.4) and check if the 

chain oil is spread as shown in (fig. 18).

 6.6  FORESTRY WORK

 6.6.1  Delimbing a tree

 Make sure there is nothing or nobody 

in the area where the branches will fall. 

  For pruning high up using a rope 

and a belt harness, carefully follow 

the instructions under par. 6.7.

1. 

Stand opposite the branch you want to cut.

2. 

Start cutting lower branches 

followed by the higher ones.

3. 

Make first cut from the bottom towards the 

top (Fig. 19.A). Complete delimbing by cutting 

from top to bottom, as shown in (Fig. 19.B).

 6.6.2  Felling a tree

 IMPORTANT 

   Where two or more persons 

are working together on felling and bucking 

operations, such operations must be performed 

in separate areas at a distance from each 

other of at least 2.5 times the height of the tree 

being felled. Do not fell trees if this involves 

risks of injuring people, coming into contact 

with a power line or causing any form of 

damage. If the tree should come into contact 

with a main power line, report the incident 

immediately to the network provider.

Before commencing the felling operations:

–

it is necessary to evaluate the natural 

inclination of the tree, the part where the 

branches are larger and the wind direction, 

to assess how the tree will actually fall;

–

remove any dirt, stones, pieces of 

bark, nails, metal staples and wire;

– clear the area around the tree and 

find a stable place to stand;

– plan obstacle-free escape routes at a 45° 

angle back and away from the direction of 

the fall (Fig. 20) which allow the operator 

to escape to a safe zone, about 2.5 times 

the height of the tree being felled;

–

Stand uphill of the land onto which the tree 

will probably roll or fall over after felling.

• 

Performing a face notch

1. 

Stand to the right of the tree, 

behind the chainsaw.

2. 

Saw a horizontal face notch to 1/3 of the 

diameter of the tree, perpendicular to the 

direction in which it will fall (Fig. 21.A).

• 

 Felling back cut

1. 

Perform the felling back cut at least 

5 cm higher than the horizontal 

face notch (Fig. 22.B).

2. 

Perform the felling back cut leaving 

sufficient wood to act as a "hinge” 

(Fig. 

22.C). The hinge wood will prevent the 

tree from twisting and falling in the wrong 

direction. Do not cut through the hinge. 

3. 

Reduce the thickness of this hinge without 

pulling out the bar, until the tree falls.

4. 

If there is any risk of the tree not falling 

in the desired direction, or that it might 

lose its balance moving backwards and 

bending the toothed chain, stop cutting