Makita DUC305 Manual De Instrucciones página 15

I f y ou c annot c ut t h e timber rig h t t h roug h w it h a single
stroke :
A ppl y lig h t pressure to t h e h an d le an d c ontinue sa w ing
an d d ra w t h e c h ain sa w ba c k a little ; t h en appl y t h e
spike bumper a little lower and finish the cut by raising
t h e h an d le.
Fig.20
Bucking
1. R est t h e bottom e d ge o f t h e c h ain sa w bo d y on
t h e w oo d to be c ut.
Fig.21
2.
W it h t h e sa w c h ain running, sa w into t h e w oo d
w h ile using t h e rear h an d le to raise t h e sa w an d t h e
f ront one to gui d e it. U se t h e spike bumper as a pi v ot.
3. C ontinue t h e c ut b y appl y ing slig h t pressure to
t h e f ront h an d le, easing t h e sa w ba c k slig h tl y . Mo v e
t h e spike bumper f urt h er d o w n t h e timber an d raise t h e
f ront h an d le again.
NOTICE:
W hen making several cuts, switch the
chain saw off between cuts.
CAUTION:
If the upper edge of the bar is used
for cutting, the chain saw may be de ected in
your direction if the chain becomes trapped. For
this reason, cut with the lower edge, so that the
saw will be de ected away from your body.
Fig.22
W h en y ou c ut a w oo d un d er tension, c ut t h e pressure d
side (A) first. Then make the final cut from the tensioned
si d e ( B ) . T h is pre v ents t h e bar f rom be c oming trappe d .
Fig.23
Limbing
CAUTION:
Limbing may only be performed by
trained persons. A h a z ar d is presente d b y t h e risk
o f ki c kba c k.
W h en limbing, support t h e c h ain sa w on t h e trunk i f
possible. D o not c ut w it h t h e tip o f t h e bar, as t h is pres-
ents a risk o f ki c kba c k.
P a y parti c ular attention to bran c h es un d er tension. D o
not c ut unsupporte d bran c h es f rom belo w .
D o not stan d on t h e f elle d trunk w h en limbing.
Burrowing and parallel-to-grain cuts
CAUTION:
Burrowing and parallel-to-grain
cuts may only be carried out by persons with
special training. T h e possibilit y o f ki c kba c k presents
a risk of injury.
P er f orm parallel-to-grain c uts at as s h allo w an angle as
possible. T ake an e x tra c aution w h en c arr y ing out t h e
c ut as t h e spike bumper c annot be use d .
Fig.24
Felling
CAUTION:
Felling work may only be per-
formed by trained persons. T h e w ork is h a z ar d ous.
O bser v e lo c al regulations i f y ou w is h to f ell a tree.
Fig.25: 1. F elling area
— Be f ore starting f elling w ork, ensure t h at :
• O nl y persons in v ol v e d in t h e f elling operation
are in t h e v i c init y ;
• A ny person inv olv ed h as an unh ind ered path
of retreat th rough a range of approx imately
4 5 ° eith er sid e of th e f elling ax is. C onsid er th e
ad d itional risk of tripping ov er elec tric al c ables;
• T h e base o f t h e trunk is f ree o f f oreign
objects, roots and ranches;
No persons or objects are present over a
d istan c e o f 2 1 / 2 tree lengt h s in t h e d ire c tion
in w h i c h t h e tree w ill f all.
— C onsi d er t h e f ollo w ing w it h respe c t to ea c h tree :
• D ire c tion o f lean ;
• L oose or d r y bran c h es ;
• H eig h t o f t h e tree ;
• Natural o v er h ang ;
• W h et h er or not t h e tree is rotten.
— C onsi d er t h e w in d spee d an d d ire c tion. D o not
c arr y out f elling w ork i f t h e w in d is gusting strongl y .
— T rimming of root sw ellings: Begin w ith th e largest sw ell-
ings. Make the vertical cut first, then the horizontal cut.
— S tan d to t h e si d e o f t h e f alling tree. Keep an area
c lear to t h e rear o f t h e f alling tree up to an angle o f
4 5 ° eit h er si d e o f t h e tree a x is ( re f er to t h e " f elling
area figure). Pay attention to falling branches.
— A n es c ape pat h s h oul d be planne d an d c leare d
as ne c essar y be f ore c uts are starte d . T h e es c ape
pat h s h oul d e x ten d ba c k an d d iagonall y to t h e rear
of the expected line of fall as illustrated in figure.
Fig.26: 1. F elling d ire c tion 2. D anger z one
3. Es c ape route
W h en f elling trees, f ollo w t h e pro c e d ures belo w :
1.
C ut a s c ar f as c lose to t h e groun d as possible. F irst make
t h e h ori z ontal c ut to a d ept h o f 1 / 5 - 1 / 3 o f t h e trunk d iameter. D o
not make t h e s c ar f too large. T h en make t h e d iagonal c ut.
Fig.27
NOTE: T h e s c ar f d etermines t h e d ire c tion in w h i c h
t h e tree w ill f all, an d gui d es it. I t is ma d e on t h e si d e
to w ar d s w h i c h t h e tree is to f all.
2. Make th e bac k c ut a little h igh er th an th e base c ut of
th e sc arf . T h e bac k c ut must be ex ac tly h oriz ontal. L eav e
approx imately 1 / 1 0 of th e trunk d iameter betw een th e bac k
cut and the scarf. The wood fibers in the uncut trunk portion
ac t as a h inge. I nsert w ed ges into th e bac k c ut in time.
Fig.28
WARNING:
under any circumstances. T h e tree w ill ot h er w ise
f all un c h e c ke d .
NOTICE:
Only plastic or aluminum wedges may
be used to keep the back cut open. The use of
iron wedges is prohibited.
15 ENGLISH
Do not cut right through the bers