Operation—Cutting
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General
1. Smaller trees needing only a single cut may need the
harvester head unlatching to be overridden with the tilt
up button pushed while cutting. The reason for this is
that the tree is forced faster than the saw chain can
cut. Once the tree is cut, the harvester head down
button can be activated to fall the tree.
2. Trees with a heavy forward lean can be fallen either
by uprooting or placing multiple front cuts, to create a
larger area to compress while back cutting.
3. Larger trees should be released once tree is falling.
This will avoid harvester head damage.
4. Tops of hills and uneven ground can also cause tree
to swing up causing carrier to lift or harvester head
damage.
5. Releasing trees as they are falling into another
standing tree can sometimes allow the tree to roll off.
6. If the fallen tree is hung in another, be careful when
pulling it down. Watch that the holding tree is not
being pulled in same direction. If so, pushing the tree
can uproot the tree away from carrier.
Using The Main Saw Unit
Prior to using saw unit keep in mind :
1. View of the saw bar if possible.
2. The harvester head will fall over when saw chain is
activated.
3. Protection of boom hydraulics and cab.
4. How the tree is positioned for delimbing.
5. While cutting, push in the required felling direction
remembering to avoid upward pressure.
6. As the cutting unit completes the cut, the saw chain will
increase in speed and the bark chips may be visible.
7. Once the cut is completed, stop activating the saw
chain button and the saw bar will return automatically.
8. When falling, it is possible to jam the saw bar. Stop the
activation of the saw chain and slowly lift the harvester
head - the weight of the tree has pressurized the oil
in the lift rams of the carrier. Therefore, the lifting
distance should not be great.
9. Check that the saw bar has returned by the saw home
sensor before moving the tree too far.
10. Ensure the log is clamped before the saw chain is
activated. A loose log may move after the saw chain
begins the cut, this may derail the saw chain or stop
the saw chain from cutting.
11. A side tear along the tree may stop the saw bar from
returning if it is not cut on the downward pass. The
saw chain cut should be made past this tear.
12. Logs should be supported when cutting, as this will
avoid log split.
13. A small amount of upward lift may be required as the
saw chain completes the cut. This will keep the cut
open and avoid saw stall.
14. Care should be taken that the end of the saw bar does
not cut into the ground when completing a cut. The
saw chain may also cut into another log damaging the
value of that log or if the harvester head is moving,
damage the saw bar and saw chain.
15. When the saw chain is jammed out or the diameter
detect is activated the feed motors are isolated. If
you require moving the stem in this position, it can be
done by pressing the option button then the feed roller
switch. Care should be taken when unjamming the
saw bar as it is easy to damage the saw bar.
Using The Top Saw Unit
1. The top saw is designed for cutting small diameter
tops off trees. The tip of the saw bar can be pinched
if larger diameters are attempted.
2. The top saw chain can be derailed if branches or the
end of the log is loaded. It is advised that the top saw
bar be visible when cutting.
2-5-1
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Summary of Contents for HTH624C
Page 4: ...Introduction 053122 PN 4 ...
Page 86: ...Index Index 3 053122 PN 86 ...
Page 87: ...Index Index 4 053122 PN 87 ...
