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Safety—Operating Precautions
TX,SAW,CHAIN,HAZ -19-08MAY20-1/1
Saw Chain Hazard
Saw chain shot is the high velocity separation and ejection
of a piece or pieces of cutting saw chain from the end of a
broken saw chain in mechanized timber harvesting. Saw
chain shot exposes both harvester head operators and
bystanders to a risk of serious injury or death. Saw chain
shot typically occurs near the saw drive sprocket (4) of
the cutting system. Saw chain shot pieces typically travel
within 15 degrees on either side of the saw bar (2) plane.
A saw 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 and is rapidly
accelerated due to a whip-like motion of the saw chain
end. The whip action causes a second break in saw chain,
ejecting pieces of the cutting saw chain at high speed.
To reduce the risk of injury from saw chain shot:
•
Operators and bystanders should never be exposed to
the saw chain shot hazard zone when saw chain (1)
is in motion.
•
All harvester heads in saw chain shot hazard zone
should be tted with appropriate guards, shields, and
windows to protect operator and operator structures in
accordance with safety standards and regulations for
forestry operations.
•
Impact resistant polycarbonate windows are
recommended.
•
Inspect the operator’s cab windows regularly and after
any impact. Replace if damaged, cloudy, or has visible
micro-cracking or crazing.
•
Inspect saw chain shot guard (6) (if equipped) each
time the saw chain is replaced. Replace saw chain shot
guard if it is missing or damaged.
•
Do not exceed maximum saw chain speed
recommended by saw manufacturer.
•
Inspect saw chain and cutting system frequently.
Replace dull saw chain. Follow saw chain
manufacturers recommendations for saw chain tension
and saw chain lubrication. Replace damaged saw chain
(1), saw chain drive sprocket (4), saw bar (2), saw chain
shot guard (6), and saw chain catcher (5).
•
Always discard saw chain after the second break.
•
Use only approved new replacement and repair parts
from the same chain or saw manufacturer.
•
Keep saw chains sharp and lubricated. Follow the saw
chain manufacturers recommendation when inspecting,
repairing, sharpening, installing and breaking-in saw
chains.
1— Saw Chain
2— Saw Bar
3— Saw Bar Tip
4— Saw Chain Drive Sprocket
5— Saw Chain Catcher
6— Saw Chain Shot Guard
15
15
15
15
XJ1097618 —UN—13SEP11
Saw Chain Shot Hazard Zone
TX1045990A —UN—08JUN10
Saw Chain Shot Pieces
TX1078028 —UN—14SEP10
Saw Chain Break without Saw Chain Shot Guard
TX1078029 —UN—14SEP10
Saw Chain Break with Saw Chain Shot Guard
6
3
2
1
5
4
TX1078030 —UN—08JUN10
Typical Saw Components
1-3-19
112321
PN=58
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