Husqvarna 235E Operator's Manual page 17

WORKING TECHNIQUES
pulling chain. In this case the chain saw pulls itself
towards the tree and the front edge of the chain saw
body rests naturally on the trunk when cutting. Cutting
with a pulling chain gives the operator better control
over the chain saw and the position of the kickback
zone.
9 Follow the instructions on sharpening and maintaining
your bar and chain. When you replace the bar and chain
use only combinations that are recommended by us.
See instructions under the headings
Cutting equipment
and Technical data.
Basic cutting technique
| _ no'_led with one hand.
Alway_re, firm grip around
the h_ndles with both hands. "
General
* Always use full throttle when cutting!
* Reduce the speed to idle after every cut (running the
engine for too long at full throttle without any load, i.e.
without any resistance from the chain during cutting,
can lead to serious engine damage).
* Cutting from above = Cutting with a pulling chain.
* Cutting from below = Cutting with pushing chain.
Cutting with a pushing chain increases the risk of kickback.
See instructions under the heading How to avoid kickback.
Terms
Cutting = General term for cutting through wood.
Limbing = Cutting branches off a felled tree.
Splitting = When the object you are cutting breaks off
before the cut is complete.
There are five important factors you should consider
before making a cut:
1 Make sure the cutting equipment will not jam in the cut.
2 Make sure the object you are cutting will not split.
3 Make sure the chain will not strike the ground or any
other object during or after cutting.
4 Is there a risk of kickback?
5 Do the conditions and surrounding terrain affect how
safely you can stand and move about?
Two factors decide whether the chain will jam or the object
that you are cutting will split: the first is how the object is
supported before and after cutting, and the second is
whether it is in tension.
In most cases you can avoid these problems by cutting in
two stages; from the top and from the bottom. You need to
support the object so that it will not trap the chain or split
during cutting.
IMPORTANT! If the chain jams in the cut: stop the
engine! Don't try to pull the chain saw free. If you do
you may be injured by the chain when the chain saw
suddenly breaks free. Use a lever to open up the cut
and free the chain saw.
The following instructions describe how to handle the
common situations you are likely to encounter when using
a chain saw.
Limbing
When limbing thick branches you should use the same
approach as for cutting.
Cut difficult branches piece by piece.
Cutting
_e attempt tocut logs !
| J _ile or when a couple |
| __ngtog_th_.Such - |
| pr_ncrease the risk
| of kickback which can result in a serious |
or fatal injury.
If you have a pile of logs, each log you attempt to cut should
be removed from the pile, placed on a saw horse or
runners and cut individually.
Remove the cut pieces from the cutting area. By leaving
them in the cutting area, you increase the risk for
inadvertently getting a kickback, as well as increasing the
risk of losing your balance while working.
The log is lying on the ground. There is little risk of the
chain jamming or the object splitting. However there is a
risk that the chain will touch the ground when you finish the
cut.
Cut all the way through the log from above. Avoid letting the
chain touch the ground as you finish the cut. Maintain full
throttle but be prepared for what might happen. (37)
If it is possible (can you turn the log?) stop cutting about 2/
3 of the way through the log.
Turn the log and finish the cut from the opposite side.
The log is supported at one end. There is a high risk that
it will split.
Start by cutting from below (about 1/3 of the way through).
Finish by cutting from above so that the two cuts meet.
The leg is supported at both ends. There is a high risk
that the chain will jam.
Start by cutting from above (about 1/3 of the way through).
Finish by cutting from below so that the two cuts meet.
Tree felling technique
Safe distance
The safe distance between a tree that is to be felled and
anyone else working nearby is at least 2 1/2 tree lengths.
Make sure that no-one else is in this "risk zone" before or
during felling. (38)
Felling direction
The aim is to fell the tree in a position where you can limb
and cross-cut the log as easily as possible. You want it to
fall in a location where you can stand and move about
safely.
Once you have decided which way you want the tree to fall
you must judge which way the tree would fall naturally.
Several factors affect this:
• Lean of the tree
• Bend
• Wind direction
5451546-92 Rev.3 2007-12-19 English - 17