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− Watch out for obstacles such as tree stumps, roots, ditches and hillocks as these could
cause you to fall.
Remember!
The chain saw must be running before it comes into contact with the wood.
11.2
To switch on:
Press the safety lock-off (2) and ON/OFF switch on (13).
Place the lowest claw (Fig. 4, J) on the wood. Raise the chain saw by the rear grip (1) and saw
into the wood. Move the chain saw back a little and place the claw further down.
Be careful when sawing splintered wood as pieces of wood may be ripped off.
11.3
Wood under tension
Fig. 11a: Top side of under tension
Danger: Tree will rear up!
Fig. 11b: Bottom side of trunk under tension
Danger: Tree will move downwards!
Fig. 11c: Thick trunks and high tension
Danger: Tree will move suddenly and with immense force!
Fig. 11d: Both sides of trunk under tension
Danger: Tree will move sideways.
11.4
Felling trees
To fell trees, observe all the safety regulations and proceed as follows:
Remember!
Danger zone: Falling trees can bring down other trees with them. The danger zone is therefore
twice the length of the tree being felled (Fig. 12).
Felling trees is dangerous and requires practice. If you are a beginner or
inexperienced, do not try to teach yourself but seek professional training
(Fig. 13).
Falling direction:
▪
First estimate the direction of fall, taking into account the centre of gravity of the crown and
the wind direction. The chain saw must be running before it comes into contact with the
wood. Switch on the chain saw. Saw an undercut in the tree in the direction of fall and
then make a horizontal cut (back cut) on the side opposite to the undercut.
▪
Make the undercut: This will give the tree a direction and guidance.
▪
Check the direction of fall: If you have to correct the undercut, always re-cut over the
entire width.
▪
Call now "Timber!"
▪
Only now make the back cut, which must be higher than the sole of the undercut. Insert
wedges in time.
▪
Leave the bridge in place as it will function as a hinge. If you cut through the bridge, the
tree will fall randomly.
▪
Fell the tree by driving a wedge into the back cut, not by sawing through it .
▪
When the tree falls, step back and watch the crown.
▪
Wait for the crown to stop swinging. Do not continue working under branches which have
got stuck.
When the chain saw is used to cut trees that exceed its power limits the chain can get stuck. If
the chain gets jammed, release it using a wooden wedge.
Do not fell trees:
▪
If you can no longer distinguish details within the danger zone, e.g. owing to fog, rain,
snow drifts or twilight.
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