Husqvarna 137 Instruction Manual page 6
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KICKBACK
SAFETY
FEATURES
WARNING:
The following
features
are included on your saw to he_p reduce the
hazard of kickback;
however,
such features
will not totally
eliminate
this danger.
As a
chain saw user, do not rely only on safety de-
vices.
You must follow
ali safety
precau-
tions, instructions,
and maintenance
in this
manual
to help avoid
kickback
and other
forces which can result in serious h3jury.
• Reduced-Kickback
Guide Bar, designed
with a small radius tip which
reduces
the
size of the kickback
danger
zone on the
bar tip. A Reduced-Kickback
Guide
Bar
has been demonstrated
to significantly
re-
duce the number and seriousness
of kick-
back when tested in accordance
with safe-
ty
requirements
for
gasolh_e
powered
chain saws as set by ANSi B175.1.
Reduced
Kickback
Symmetrical
Guide
Bar
__rnall
Radius
Tip
Symmetrical
Guide
Bar
I
"_,_k
L
Large
Radius
Tip
• Low-Kickback
Chain,
designed
with
a
contoured
depth
gauge
and guard
link
which
deflect
kickback
force
and allow
wood to gradually
ride into the cutter. Low-
Kickback
Chain has met kickback
perfor-
mance
requirements
when
tested
on a
representative
sample of chain saws
be-
low 3.8 cubic inch displacement
specified
in ANSI B175.1.
Low-Kickback
Chain
j
Contoured
Depth
Gauge
_
Elongated
Guard Link
Deflects
KickbackForce
And Allows Wood
To Gradually
Ride Into Cutter
• Front Hand Guard, designed to reduce the
chance of your left hand contacting the chain
if your hand slips off the front handlebar,
• Position
of front and rear handlebars,
de-
signed with distance between
handles and
"in-line" with each other.
The spread and
"in-line" position
of the hands provided
by
this design work together to give balance
and resistance
in controlling
the pivot of
the saw back toward
the operator
if kick-
back occurs.
CHAIN
BRAKE
AND
CKA
ANGLE
• Chain Brake, designed
to stop the chain in
the event of kickback.
m_WARNING:
WE
DO NOT
REP-
RESENT
AND
YOU
SHOULD
NOT
AS-
SUME
THAT
THE
CHAIN
BRAKE
WILL
PROTECT
YOU
IN THE
EVENT
OF
A
KICKBACK.
Kickback
is a lightning fast ac-
tion which throws
the bar and rotating chain
back and up toward the operator.
Kickback
can be caused by allowing
contact of the bar
tip in the danger zone with any hard object.
Kickback
can also be caused
by pinching the
saw chain along the top of the guide bar, This
action may push the guide bar rapidly back
toward the operator,
Either of these events
may cause you to lose control of the saw
which could
result in serious
injury or even
death,
DO NOT RELY UPON ANY OF THE
DEVICES
BUILT INTO YOUR
SAW.
YOU
SHOULD
USE THE SAW PROPERLY
AN D
CAREFULLY
TO AVOID
KICKBACK.
Re-
duced-kickback
guide bars
and low-kick-
back
saw
chains
reduce
the chance
and
magnitude
of kickback
and
are
recom-
mended.
Your saw has a low kickback
chain
and bar as original equipment.
Repairs
on a
chain brake
should
be made by an autho-
rized servicing
dealer.
Take your unit to the
place of purchase
if purchased
from a ser-
vicing
dealer,
or to the nearest authorized
Husqvarna®
service
dealer.
• Tip contact in some cases may cause a light-
ning fast reverse REACTION,
kicking the
guide bar up and back toward the operator.
• Pinching the saw chain along the top of the
guide bar may push the guide bar rapidly
back toward the operator.
• Either of these reactions
may cause you to
lose control of the saw which could result
in serious
injury.Do
not rely exclusively
upon the safety devices built into your saw.
_b WARNING:
Computed
kickback
angle (CKA) listed on your saw and listed in the
CKA table below represents angle of kickback
your
bar and chain combinations
will have
when tested in accordance
with CSA (Cana-
dian Standards
Association)
and ANSI stan-
dards. When purchasing replacement bar and
chain, considerations
should
be given to the
lower CKA values. Lower CKA values repre-
sent safer angles to the user, higher values in-
dicate more angle and higher kick energies.
Computed
angles
represented
indicate total
energy and angle associated without activation
of the chain brake during kickback.
Activated
angle represents chain stopping time relative to
activation
angle of chain break and resulting
kick angle of saw. In aII cases lower CKA val-
ues represent
a safer operating environment
for the user.
The following
guide bar and chain combina-
tions
meet kickback
requirements
of CSA
Standards
Z62.1,
Z62.3,
& ANSI
B175.1
when
used on saws
listed in this manual.
Use
of bar and chain
combinations
other
than those
listed is not recommended
and
may
not meet the CKA
requirements
per
standard.
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