Petrol Powered Chainsaws
E&OE
©2017 Bäumr-AG
18
Chainsaw Operation
Chainsaws are high-speed, fast-cutting equipment with exposed blades that can
cause serious or fatal injury if not used correctly or without taking proper safety
precautions.
It is extremely important that you read and fully understand the information in this
section and all other safety warnings / recommendations and usage instructions before using the
equipment
. • Always wear suitable protective clothing and equipment when using the machine. • Inspect the
machine before each use and check for wear or damage. If the machine is damaged, have it inspected and
repaired at an authorised service centre before using it again. • If you experience excessive vibration from
the machine during operation, this may indicate wear or damage. It is recommended to have it inspected and
repaired before using it again. • Be aware that once the engine is running, the cutting blades will be rotating
and parts of the machine may be extremely hot. •
Do NOT allow the engine to run above idle speed if the
chain brake is engaged or the saw chain is pinched etc
– running for more than a few seconds with
the chain brake engaged may cause severe damage to the clutch or chain brake mechanism and/or
make the chain brake mechanism unsafe
. • Ensure that the saw chain is
drive cover nuts are properly tightened before use and during cutting. • Always release chain tension after
finishing work to prevent damage through over-tension as the saw chain cools and contracts.
When the engine is idling (slowest continuous running speed), the clutch should disengage, preventing the
saw chain from being rotated.As engine speed increases, the clutch engages and rotates the saw chain.
Note the following recommendations:
•
Operate the engine at full speed when cutting.
•
Cut according to the recommended methods. If in doubt, do NOT cut
– seek professional advice.
Understanding and Avoiding "Kick-Back"
and Other Reactionary Forces
Kick-back and other reactionary forces can cause
loss of control of the machine and can result in
serious, even fatal injury
– use the chainsaw in ways to avoid kick-
back and other reactive forces at all times
.
When the saw chain is rotating, many forces are created, such as the
ability to cut. The contact point between the chainsaw and object to cut is
critical. If the chainsaw is not used correctly, cutting forces may become
"reactionary", in that instead of the chain rotating, a reactionary force is
created. Many factors affect the occurrence and force of reaction, such as
saw chain speed, contact angle, and saw chain condition.
Kick-Back
"Kick-back" is a reactionary force that causes the chain
bar to rotate up and back, against the direction of cut.
Kick-back can also be thought of as the chain cutters at
the tip of the chain bar
– the "kick-back zone", "digging
in" to the object to be cut and momentarily stopping or
significantly slowing rotation of the saw chain, which
causes the chainsaw to suddenly and quickly rotate
backwards towards the operator.
The chain brake handle is a safety device that is designed to apply the chain
brake if the handle is moved forward. During a "kick-back" event, the sudden
rotation upward of the chain bar will cause the chain brake handle to activate
through inertia or to contact the operator's hand or arm, therefore engaging the
chain brake. To avoid kick-back:
•
Do NOT use the tip of the saw for cutting or alow it to make contact with any
object.
NEVER ALLOW ANY OBJECT
TO COME INTO CONTACT
WITH THE KICK-BACK ZONE
Kick-Back
Zone
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