waratah HTH616C SIII, Operator'S Manual

Page: 40 / 92

Operation: Special Techniques
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Quarter Cutting
This method is used on various occasions to gain better
control when felling. Use a saw cut, placed at the base of
the tree in the direction of the fall, approximately a quarter
of the diameter into the tree. The harvester head is then
moved to the back of the tree ready for falling.
CAUTION: Prevent possible injury while felling.
Always work on one tree at a time and complete
the tree cut. Failure to follow the safety
precautions may lead to serious injury.
Ensure the back cut (2) is placed higher in the tree than
the front cut (1); approximately one-quarter of the tree
diameter. When placing these cuts, ensure they are
parallel, creating a hinge effect, which will prevent loss
of control.
In some cases, several quarter cuts will prevent the tree
snapping off too soon. This method is used on large butt
flares, heavy leaners, badly swept butts, multi leaders,
and in any other situation where the operator requires
more control during felling.
2
1
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1— Front or compression cut 2— Back or release cut
Falling Multi-leaders
‘Crutched’ trees can be cut either at a point where they
separate, or, if one side is of small diameter, it can be
lifted until the crutch splits.
Base-crutched trees may need to felled separately if the
split line is close to the ground.
Assess the situation carefully and identify whether the
tree is sound at the base; if so, complete felling may be
an option.
If signs of rot (4) exist, each leader requires individual
removal. This is done in a conventional manner, except at
a greater height.
CAUTION: Prevent possible injury while felling
multi-leader trees. Caution must be exercised
to ensure other leaders do not break away
unexpectedly. Failure to follow the safety
precautions may lead to serious injury.
4— Sign of tree rot
4
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