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The cutting force of the chain exerts a rotational force
on the saw in the opposite direction to the movement of
the chain.
This leads to an upward movement of the guide rail.
Avoid backlash
The best protection is to avoid situations that lead to
backlashes.
1. Keep your eyes on the position of the upper guide rail
always.
2. Let this area never come in contact with an object.
Do not cut anything with it. Be especially careful in
the vicinity of wire fences and when cutting small,
hard branches, in which the chain can become slightly
jammed.
3. Cut only one branch at a time.
A = Retraction
The retraction takes place if the chain suddenly gets
stuck at the lower side of the rail, since it is jammed
or comes in contact with a foreign body in the wood.
The chain then pulls the saw forward. The retraction
happens often when the chain during contact with the
wood is not running at full speed.
Avoid backlash
1. Be aware of the forces and situations, which could
lead to the jamming of the chain at the rail's bottom
part.
2. Always start with the chain running at full speed
cutting for cutting.
B = Rebound
The rebound takes place if the chain gets stuck on the
top side of the rail suddenly, since it is jammed or if it
comes in contact with a foreign body in the wood. The
chain can press the saw jerkily against the operator.
Rebounds happen often when the rail's upper side is
used for cutting.
Avoid rebounds
- Danger of backlash! There is always danger of
backlash, if the blade tips come into contact with
branches or other objects. The brush cutter becomes
uncontrollable due to this and can pushed with great
force in the direction of the operator.
1. Be aware of the forces and situations, which can lead
to jamming of the chain at the rail's top side.
2. Do not cut more than a branch at a time.
3. Do not tilt the rail to the side when you drag it from a
cutting gap, since the chain could be otherwise jammed.
A23
A24
A25
G
B
