Chain Saw Basics - Textron Company Greenlee Utility 38568 Manuel D'instructions

Chain Saw Basics

This section introduces some basic principles of chain
saw use: Hazard Prevention, Compression and
Tension.
HAZARD PREVENTION
The cutting action of this chain saw is performed by a
chain-type blade driven at high speed by a powerful
hydraulic motor. When used carefully and properly, the
chain saw is a highly effective cutting tool.
When used improperly, or when anything interferes with
the normal rotation of the blade, the operator could
very suddenly and very quickly lose control of the saw.
Such loss of control can result in harm to the operator.
The three terms that describe loss of control are pull-in,
push-back, and kickback.
Pull-In
Pull-in can occur when the blade at the bottom of the
bar is doing the cutting. If the blade is suddenly pinched
in the cut, or if it contacts a foreign object such as a
nail, the saw may be suddenly and forcefully pulled
away from the operator.
Push-Back
Push-back can occur when the blade at the top of the
bar is doing the cutting. If the blade is suddenly pinched
in the cut, or if it contacts a foreign object such as a
nail, the saw will be suddenly and forcefully pushed
back toward the operator.
Push-Back
Greenlee / A Textron Company
Pull-In
PULL
PUSH
Long-Reach Chain Saws
Kickback
Kickback is much more hazardous than pull-in or push-
back. When kickback happens, the entire saw may
rotate suddenly and forcefully. The bar of the saw may
quickly travel upward and back, toward the operator.
Kickback can occur when the blade at the guide bar
tip contacts anything while the chain is rotating. Some
causes for kickback are:
• using the guide bar tip for cutting.
• contacting a nail or other metal object when
cutting.
• accidental contact when cutting more than one
branch at a time.
Using Guide Bar Tip for Cutting
Contact with Metal Objects
Cutting More Than One Branch at a Time
9
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Metal
Objects