Stihl 090 User Manual

10
Reactive forces during the cut, including kickba-*
WARNING!
Reactive forces, that
may occur during any cut are kick-
back, pushback andpull-in. Reactive forces ·can ··be
dangerous! In any chain saw, the powerful force used to
cut wood can be reversed (and work against the operator).
If the rotating chain is suddenly stopped
by contact with
any solid object like a log or branch or is pinched, the
reactive forces Instantly
oCcUr. These reactive forces may
result in loss of control which may, in tum, cause serious
or fatal injury. Anunderstaiidin~i of the cauSes of these
reactfveforces may help you aVoid loss of control.
The
most common reactive forces are
':"ldckback,
-pushback,
-pull-in.
Kickback:
Kickback occurs when the upper quadrant of the bar nose
contaCts a solid object in· the woOd Or is pinched (III. 11).
The reaction of the cutting force of the chain 'causes a
rotational force of the chain saw'in the directidn Opposite
to the chain movement, mainly in the plane of the bar. This
may fling the bar in an uncontrolled arc mainly in the plane
of the
bar.
Under some circumstances the bar ·moves towards the
operator
who may suffer severe or fatal injury. It may also
occur during limbing. It also occurs when the nose of the
guide bar is pinched unexPeCtecDY, unintentionally
contacts sorld material in the wood (ill. 12) or is Incorrectly
used
to begin a plunge or bOring cut.
The greater the force of the kfckb8ck reaction, the more
difficult it becomes for the operator to controf the saw.

Stihl 090 Specifications

General

Brand	Stihl
Model	090
Category	Chainsaw
Language	English