Compression And Tension - Greenlee Fairmont HCS5130CB Operation Manual

Chain Saw Basics (cont'd)
Chain Brake Feature
This chain saw has a chain brake feature, which, when
actuated, stops chain rotation quickly. This is accom-
plished by the rotation of a spool in the hydraulic flow
path, preventing flow to and from the chain saw. This
spool is connected to the front shroud so that when the
shroud is moved forward, the spool rotates, preventing
hydraulic flow and stopping the chain immediately. To
restart the chain saw operation, the front shroud must
be pulled rearward to rotate the spool and allow
hydraulic flow.
Site Preparation Tips
• Prepare the cutting area by clearing away brush,
branches, vines, etc.
• Remove any unnecessary tools and coil up excess
hydraulic hose.
• Survey the limb, branch or tree to predict the direction
or path of fall. Be sure that no personnel are in that
area.
Some factors that will influence the direction or path
of fall of the tree include, but are not limited to:
– weight distribution of the limbs and branches.
The weight distribution can be changed by pruning.
– the lean of the tree. A tree that leans will tend to
fall in the direction it leans.
– wind direction. Do not fell a tree in strong winds.
• If working in a municipal area, plan the direction of fall
so that a limb or tree doesn't fall into a roadway, strike
a nearby building, contact nearby power lines, etc.
• If the tree is on an incline, work uphill from the fall
path. A tree or branch might tend to bounce or roll
downhill.
• Plan and clear two emergency exit routes, in case the
tree falls in an unexpected direction.
Greenlee / A Textron Company
Chain Saws with Chain Brake

COMPRESSION AND TENSION

Any branch or log will have two forces acting on it
— compression and tension. As the branch or log is cut,
compression tends to push the two halves toward each
other. Tension tends to pull the two halves apart.
See the illustrations. A log or limb supported at both
ends has the compression on the top. A log or limb
supported at one end has the compression on the
bottom.
Make the first cut on the compression side. Cut through
approximately 1/3 of the log's diameter. Make the
second cut on the tension side. This will decrease the
likelihood that the saw will become pinched in the cut.
Figure 8 Compression on Top
Compression
Tension
Figure 9 Compression on Bottom
Tension
9
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Side View
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Side View
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Compression