Safety: Operation Precautions
T7M7G6M,00004ED -19-02AUG21-1/1
Avoid Chain shot
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135231
—UN—18APR13
Saw chain break without saw Chain shot guard
XJ1134867 —UN—12APR13
Saw chain break with saw Chain shot guard
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134865
—UN—18APR13
Saw Chain shot hazard zone
Chain shot is the high velocity separation and ejection
of a piece or pieces from the end of a broken saw chain
during mechanised timber harvesting.
CAUTION: Saw Chain shot can expose machine
operators and bystanders to the risk of
death or serious injury.
Chain shot pieces typically travel within 15 degrees on
either side of the saw bar plane. A Chain shot consists
of two breaks in a saw chain. First, the saw chain loop
breaks and forms two ends. One end moves past the
saw chain drive sprocket or saw bar tip and is rapidly
accelerated due to motion of the saw chain end. The whip
action causes a second break in the saw chain, ejecting
pieces of the cutting saw chain at high speed.
To reduce the occurrence of Chain shot:
•
Follow recommendations for saw unit maintenance and
adjustments. Inspect the saw chain and cutting system
frequently. Replace damaged parts using approved
replacements.
•
Keep saw chains sharp and lubricated. Do not exceed
the maximum recommended saw speed. Check
hydraulic oil pressure and flow rate to the saw unit after
any carrier hydraulic system repairs.
•
Discard the saw chain after the second break.
To reduce the risk of injury from Chain shot:
•
Operators and bystanders should never be exposed
to the Chain shot hazard zone when the saw chain is
in motion.
•
All machines in the Chain shot hazard zone should
be fitted with protective guards, shields, and
windows in accordance with forestry operation safety
standards and regulations.(Polycarbonate windows are
recommended.)
•
Inspect the cabin window regularly, and after every
impact. Replace the window if it is damaged, cloudy, or
has visible micro-cracking or crazing.
•
Inspect the Chain shot guard (if equipped) each time
the saw chain is replaced. Replace the Chain shot
guard if it is missing or damaged.
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