Jonsered 670 - Manual (Page 23)

English –
23
!
We recommend that you use
a bar that is longer than the
diameter of the tree, so that
you can make the FELLING
CUT and DIRECTIONAL CUT
with single cutting stokes.
(See
”Technical data” to find
out which lengths of bar are
recommended for your saw).
There are methods for felling
trees with a diameter larger
than the bar length. However
these methods involve a much
greater risk that the kickback
zone of the bar will come into
contact with the tree.
UNLESS YOU HAVE SPECIAL TRAINING WE
ADVISE YOU NOT TO FELL TREES WITH A
DIAMETER LARGER THAN THE BAR LENGTH
OF YOUR SAW!
E Limbing
MOST KICKBACK ACCIDENTS HAPPEN
DURING LIMBING!PAY CLOSE ATTENTION
TO THE POSITION OF THE KICKBACK ZONE
OF THE BAR WHEN YOU ARE LIMBING
BRANCHES THAT ARE IN TENSION!
Make sure there are no
obstacles in your way. Work
on the left side of the trunk.
Work close to the saw for
maximum control. If possible,
let the weight of the saw rest
on the trunk.
Keep the tree between you
and the saw as you move
along the trunk.
F Cutting the trunk into logs
See chapter ”General working instructions” point 2 ”Basic
cutting technique”.
!
4 Freeing a tree that has fallen badly = high
accident risk
A Freeing a “Trapped tree”
The safest method is to use a winch.
A Tractor-mounted
B Portable
B Cutting trees and branches that are in tension
Preparations:
a) Work out which way the tree or branch will move if released
and where the natural “BREAKING POINT” is (i.e. the place
it would break if it was bent even more).
b) Decide which is the SAFEST way to release the tension
and whether YOU are able to do it safely. In complicated
situations the only safe method is to put aside your chain
saw and use a winch.
General advice:
a) Position yourself so that
you will be clear of the
tree or branch when it
springs free.
b) Make one or more cuts at
or near the BREAKING
POINT. Make as many
cuts of sufficient depth as
necessary to reduce the
tension and make the tree
or branch break at the
BREAKING POINT.
Never cut straight
through a tree or branch
that is IS in tension!
SAFETY INSTRUCTIONS