Craftsman 138.98946 Operator's Manual page 7

Bar Tip Guard
An attachment that may be provided on the end
of the guide bar to prevent the chain at the end
of the guide bar from contacting the wood.
Bucking
The process of cross cutting a felled tree or log
into lengths.
Chain Saw Powerhead
A chain saw without the saw chain and guide
bar.
Clutch
A mechanism for connecting and disconnecting
a driven member to and from a rotating source
of power.
Drive Sprocket or Sprocket
The toothed part that drives the saw chain.
Felling
The process of cutting down a tree.
Felling Back Cut
The final cut in a tree felling operation made on
the opposite side of the tree from the notching
undercut.
Front Handle
The support handle located at or toward the
front of the chain saw.
Front Handle Guard
A structural barrier between the front handle of
a chain saw and the guide bar, typically located
close to the hand position on the front handle.
Guide Bar
A solid railed structure that supports and guides
the saw chain.
Kickback
The backward or upward motion, or both of
the guide bar occurring when the saw chain
near the nose of the top area of the guide bar
contacts any object such as a log or branch, or
when the wood closes in and pinches the saw
chain in the cut.
Kickback, Pinch
The rapid pushback of the saw which can
occur when the wood closes in and pinches the
moving saw chain in the cut along the top of the
guide bar.
Kickback, Rotational
The rapid upward and backward motion of the
saw which can occur when the moving saw
chain near the upper portion of the tip of the
guide bar contacts an object, such as a log or
branch.
Lock-out button
A movable stop that prevents the unintentional
operation of the switch until manually actuated.
Low-Kickback Chain
A chain that complies with the kickback
performance requirements of ANSI B175.1-1991
when tested on a representative sample of chain
saws.
Normal Cutting Position
Those positions assumed in performing the
bucking and felling cuts.
Notching Undercut
A notch cut in a tree that directs the tree's fall.
Oiler Control
A system for oiling the guide bar and saw chain.
Rear Handle
The support handle located at or toward the rear
of the saw.
Reduced Kickback Guide Bar
A guide bar which has been demonstrated to
reduce kickback significantly.
Replacement Saw Chain
A chain that complies with the kickback
performance requirements of ANSI B175.1-1991
when tested with specific chain saws. It may not
meet the ANSI performance requirements when
used with other saws.
Saw Chain
A loop of chain having cutting teeth, that cut
the wood, and that is driven by the motor and is
supported by the guide bar.
Spiked Bumper (Spike)
The pointed tooth or teeth for use when felling
or bucking to pivot the saw and maintain
position while sawing.
Switch
A device that when operated will complete or
interrupt an electrical power circuit to the motor
of the chain saw.
Switch Linkage
The mechanism that transmits motion from a
trigger to the switch.
7 - English