Husqvarna K6500 Operator's Manual page 18

Kickback
WARNING! Kickbacks are sudden and
!
can be very violent. The power cutter can
be thrown up and back towards the user
in a rotating motion causing serious or
even fatal injury. It is vital to understand
what causes kickback and how to avoid it
before using the machine.
Kickback is the sudden upward motion that can occur if
the chain is pinched or stalled in the kickback zone. Most
kickbacks are small and pose little danger. However a
kickback can also be very violent and throw the power
cutter up and back towards the user in a rotating motion
causing serious or even fatal injury.
Reactive force
A reactive force is always present when cutting. The force
pulls the machine in the opposite direction to the chain
rotation. Most of the time this force is insignificant. If the
chain is pinched or stalled the reactive force will be strong
and you might not be able to control the power cutter.
Never move the machine when the cutting equipment is
rotating. Gyroscopic forces can obstruct the intended
movement.
Kickback zone
Never use the kickback zone of the bar for cutting. If the
chain is pinched or stalled in the kickback zone, the
reactive force will push the power cutter up and back
towards the user in a rotating motion causing serious or
even fatal injury.
18 – English
OPERATING
Climbing kickback
If the kickback zone is used for cutting the reactive force
drives the bar with the chain to climb up in the cut. Do not
use the kickback zone. Use the lower quadrant of the bar
to avoid climbing kickback.
Pinching kickback
Pinching is when the cut closes and pinches the cutting
equipment. If the chain is pinched or stalled the reactive
force will be strong and you might not be able to control
the power cutter.
If the chain is pinched or stalled in the kickback zone, the
reactive force will push the power cutter up and back
towards the user in a rotating motion causing serious or
even fatal injury. Be alert to movement of the work piece
or anything else that can occur, which could cause the cut
to close and pinch the cutting equipment.