STIGA SPR 500 AE 278420008/ST1 - Инструкция по эксплуатации - Страница 182

EN - 12

before completing the felling back cut and 

use some wooden, plastic or aluminium 

wedges (Fig. 23.D) to open the cut. Force 

the tree to fall along the desired line by 

hitting the wedges with a sledge hammer. 

5. 

When the tree starts to fall, it is necessary to 

withdraw the machine from the cut, switch it 

off  (par. 6.9), lie it on the ground and take the 

foreseen exit route. Beware of falling 

branches and pay attention where you 

put your feet.

 6.6.3  Limbing tree branches

Limbing means removing the 

branches from a felled tree.

Be careful of where the branches are 

lying on the ground, the risk of them being 

under tension, the direction the branch may 

go during cutting and the risk of the tree 

being unstable after the branch has been cut.

When limbing, it is necessary to 

leave the lower, larger branches to 

support the trunk on the ground. 

Remove the small branches with 

a single cut (Fig. 24.A).

It is recommended to cut the tensioned branches 

working from the bottom upwards to prevent 

the chainsaw from bending (Fig. 24.B).

 6.6.4 

Bucking the trunk

Bucking means sawing a tree trunk into logs.

It is essential to make sure your feet are 

positioned firmly on the ground, and your weight 

is distributed equally on both feet. If possible, 

it is recommended to raise and support the 

trunk using branches, logs or blocks of wood.

It is easier to saw a log using the 

spiked bumper (Fig. 1.I):

1. 

plant the spiked bumper into the log and use 

it as a pivot. Cut with an arched motion to 

make the bar penetrate the wood (Fig. 25);

2. 

repeat several times if necessary, changing 

the point where you plant the spiked bumper.

• 

Trunk lying on the ground

When the entire trunk is lying on the 

ground, it is bucked from the top 

down (overbucking) (Fig. 26.A). 

–

Cut up to half the diameter, roll the log 

over and finish sawing on the other side.

• 

Trunk resting on one end only

When the trunk is resting on one end only: 

–

saw through 1/3 of the diameter from the 

bottom up (underbucking) (Fig. 27.A);

–

then perform the final cut, overbucking 

to reach the first cut (Fig. 27.B).

• 

Trunk resting on both ends

When the trunk is resting on both ends: 

–

saw through 1/3 of the diameter from the 

top down (overbucking) (Fig. 28.A);

–

then perform the final cut, underbucking the 

lower 2/3 to reach the first cut (Fig.. 28.B).

• 

Sloping trunk

Always stand uphill when bucking 

a sloping trunk (Fig. 29).

During the operation, to maintain control when 

the cut is almost complete, reduce the bucking 

pressure without removing removing your 

hands from the machine hand grips. Take all 

necessary precautions to prevent the machine 

from coming into contact with the ground.

 6.7  FOR PRUNING HIGH UP USING A 

ROPE AND A BELT HARNESS

 IMPORTANT 

   This chapter describes the 

work procedures implemented to reduce 

the risk of injuries when using chainsaws 

for trimming and performing height work 

aided by a rope and belt harness. 

This is not intended to replace formal 

training on the subject. The guidelines 

provided in this appendix are only examples 

of best practice. National laws and 

regulations must always be observed.

 6.7.1 

Using the chainsaw with two hands 

Using the chainsaw with two hands allows you to:

–

maintain a firmer grip on the chainsaw 

in the event of a kickback;

–

maintain a level of control over the 

chainsaw that decreases the probability 

of it coming into contact with the 

ropes and the operator's body;

–

adopt a safe work position to avoid any 

loss of control that could lead to contact 

with the chainsaw (unintentional movement 

while the chainsaw is running). 

In order to be able to grip the chainsaw 

with both hands, as a general rule, the 

operator must always try to maintain a 

safe position when using the chainsaw:

–

at a hip level when cutting horizontally or 

–

at a solar plexus level when cutting vertically.