Reactive Forces - Stihl HTA 135 Instruction Manual

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4.8

Reactive Forces

4.8.1 Kickback
Kickback can be caused for the following reasons:
– The rotating saw chain in the upper quadrant of the bar
nose makes contact with a hard object and is suddenly
braked.
– The rotating saw chain is pinched at the bar nose.
WARNING
￭
￭ If kickback occurs, the pole pruner can be thrown upwards
and backwards. The user can lose control of the pole
pruner and be seriously injured.
► Always hold your pole pruner firmly with both hands.
► Always keep your body out of the plane of the cutting
attachment.
12
► Use the working techniques described in this instruction
manual.
► Do not cut with the upper quadrant of the bar nose.
► Always cut with a properly sharpened and tensioned
saw chain.
► Use a reduced kickback saw chain.
► Use a guide bar with a narrow radius nose.
► Always cut with the chain running at full speed.
4.8.2 Pull-In
The pole pruner is pulled away from the operator when the
bottom of the bar is used for cutting.
WARNING
￭ If the rotating chain makes contact with a hard object and
is suddenly pinched, the pole pruner is abruptly jerked
away from the operator. The user can lose control of the
pole pruner and be seriously injured.
► Always hold your pole pruner firmly with both hands.
► Use the working techniques described in this instruction
manual.
► Keep the guide bar straight in the cut.
► Apply the stop properly.
► Always cut with the chain running at full speed.
4 Safety Precautions
0458-698-0121-A