Husqvarna K 7000 Chain Operator's Manual page 12

Kickback is the sudden upward motion that can occur if
the diamond 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 product in the opposite direction to the
diamond chain rotation. Most of the time this force is
insignificant. If the diamond 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 product when the cutting equipment is
rotating. Gyroscopic forces can obstruct the intended
movement
Kickback zone
Never use the kickback zone of the guide bar for cutting.
If the diamond 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.
Climbing kickback
If the kickback zone is used for cutting, the reactive
force drives the guide bar with the diamond chain to
climb up in the cut. Do not use the kickback zone. Use
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the lower quadrant of the guide bar to avoid climbing
kickback.
Pinching kickback
Pinching is when the cut closes and pinches the cutting
equipment. If the diamond chain is pinched or stalled the
reactive force will be strong and you might not be able to
control the power cutter.
If the diamond 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 for potential
movement of the work piece or anything else that can
occur, which could cause the cut to close and pinch the
cutting equipment.
To cut in pipes
WARNING: If the diamond chain is pinched
in the kickback zone it will cause a severe
kickback.
Special care should be taken when cutting in pipes. If
the pipe is not properly supported and the cut kept open
through out the cutting, the guide bar might be pinched.
Be especially alert when cutting a pipe with a belled end
or a pipe in a trench that, if not properly supported, may
sag and pinch the guide bar.
If the pipe is allowed to sag and close the cut, the guide
bar will be pinched in the kick back zone and a severe
kick back might develop. If the pipe is properly
supported the end of the pipe will move downward, the
cut will open and no pinching will occur.
1455 - 003 - 03.03.2020