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SAFETY RULES
,i,Ji,J,i
Never Reverse
Hand Positions
t
t
!
Stand To
The Left
Of The Saw
Elbow
Locked
Thumb On
Under Side Of
Handlebar
Figure 4
REDUCE THE CHANCE
OF KICKBACK
.
Recognize that kickback
can happen,
With a basic
understanding of kickback, you can reduce the element
of surprise which contributes to accidents.
*
Never let the moving chain contact any object at the
tip of the guide bar. Figure 2.
,
Keep the working area free from obstructions such
as other trees, branches, rocks, fences, stumps, etc
Figure 3. Eliminate or avoid any obstruction that your
chain could hit while you are cutting through a particular
fog or branch.
,
Keep your chain sharp and properly tensioned. A
toose or dut! chain can increase the chance of kickback
to occur. Follow manufacturer's chain sharpening and
maintenance instructions° Check tension at regular in-
tervals with the engine stopped, never with the engine
running.
Make sure the bar clamp nuts are securely
tightened after tensioning the chain°
o Begin and continue cutting at full throttle.
If the
chain is moving at a slower speed, there is greater
chance for kickback to occur,
,
Cut one log at a time.
o Use extreme caution when re-entering a previous
cut.
Do not attempt plunge cuts.
.
Watch for shifting logs or other forces that could close
a cut and pinch or fall into chain.
*
Use the Reduced-Kickback
Guide Bar and Low-
Kickback Chain specified for your saw°
MAINTAIN
CONTROL
-
Keep a good, firm grip on the saw with both hands
when the engine is running and don't let go. Figure
4oA firm grip can neutralize kickback and help you main-
tain control of the saw. Keep the fingers of your left hand
encircling and your left thumb under the front handlebar
Keep your right hand completely around the rear handle
whether you are right handed or left handed, Keep your
left arm straight with the elbow locked°
-
Position your left hand on the front handlebar so it
is in a straight line with your right hand on the rear
handle when making bucking cuts° Figure 4 Never
reverse right and left hand positions for any type of cut_
ting.
o
Stand with your weight evenly balanced
on both
feet.
*
Stand slightly to the left side of the saw to keep your
body from being in e direct line with the cutting
chain. Figure 4_
-
Do not overreach.
You could be drawn or thrown off
balance and lose control of the saw,
,
Do not cut above shoulder height.
It is difficult to
maintain control of saw above shoulder height,
UNDERSTANDING
REACTIVE
FORCES
Pinch-Kickback
and Pull-In occur when the chain is
suddenly stopped by being pinched, caught, or by
contacting a foreign object in the wood. This stopping
of the chain results in a reversal of the chain force used to
cut wood and causes the saw to move in the opposite direc-
tion of the chain rotation, Either reaction can result in Ioss
of control and possible serious injtJry.
o
Ptnch-Klckback
-
occurs when chain on top of guide bar is suddenly
stopped,
-
rapidly drives saw straight back toward operator.
,
Pull-In
-
occurs whenthe chain on the bottom of the guide bar
is suddenly stopped.
-
pulls the saw rapidly forward.
KICKBACK
SAFETY
FEATURES
&
WARNgNG
THE
FOLLOWING
FEATURES
ARE
IN-
CLUDED ON YOUR SAW TO HELP REDUCE
THE HAZARD OF KICKBACK; HOWEVER,
SUCH
FEATURES
WILL
NOT TOTALLY
ELIMINATE THIS DANGEROUS REACTION.
AS A CHAIN SAW USER, DO NOT RELY
ONLY ON SAFETY DEVICES.
YOU MUST
FOLLOW
ALL
SAFETY
PRECAUTIONS,
INSTRUCTIONS,
AND MAINTENANCE
IN
THIS MANUAL TO HELP AVOID KICKBACK
AND OTHER FORCES WHICH CAN RESULT
IN SERIOUS INJURY.
Reduced-Kickback Guide Bar,designed witha small radius
tip which reduces the size of the kickbackdanger zone on the
guide bartip, Figure5. A Reduced-Kickback Guide Bar isone
which hasbeen demonstratedto significantlyreducethe num-
ber and seriousness of kickbackswhen tested in accordance
withANSl B175,1, 1991
•
Low-Kickback
Chain, designed with a contoured depth
gauge and guard link which deflect kickback force and allow
woodto gradually ride intothe cutter Figure5. Low-Kickback
Chainis chain whichhas met kickback performance require-
mentsof ANSI B175.1-!991 when tested on a representative
sample of chain sawsbelow 3,8 cubic inch displacement spe-
cified in ANSI S17&I-1991
,,
Handguard, designedto reducethe chance of your left hand
contacting the chain if your hand slips off the front handlebar,
•
Position of front and rear handlebars designed with dis_
tance between handes and "in*line" with each other., The
spread and "in-line"position of the hands prov dad by this de-
sign work together to give balance and resistance incontrol-
lingthe pivot of the saw back toward the operator if kickback
OCCURS,
•
ANSI B175.1-1991
- Safety requirements for gasoline powered chain
saws as set by the American National Standards Institute, Inc, Stan-
dard ei75.1-1991.
Reduced K_ckbeck
Smelt
Symmetrical
Guide BBr
Red}_J_ _p
Symmetrical
t_tr_e
G_Ido Bar
Red,us Tip
Cohtogfed
,_*
Depth G4_uge
_,
._"
_
_ongstQe
__
G*Jerd
L_tlk
l°°'°°"
Kl_kb_¢k
Fot_
ck
And Allr_ws Wood
Ch_irt
\
TO Gradually
Rllfe
Snto Cu{_er
'_"'_
on Obsltucl
Mste_tal
Chrtirl Wi_h H$£h
Kickback P otetllle$
Figure 5
-4-
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