Makita UC4030A Owners Manual - Page 7

Chain Saw Nomenclature 1 2 3 7 6 8 54 9 10 11 12 13 1 Tubular handle 2 Hand guard (release for chain brake) 17 3 Spike bar 4 Sprocket guard quick tightener 5 Sprocket guard, chain brake 6 Carbon brush cover 7 Back hand guard 8 Power cord with plug 9 Guide bar 10 Oil tank cap 11 Identification plate 16 15 14 12 Locking button 13 Rear handle 14 Power switch 15 Sightglass for oil level 16 Saw chain 17 Cord grip for electric cord (pull relief) Bucking: The process of cross cutting a felled tree or log into lengths. Chain Brake: A device used to stop the chain saw. 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 toothead 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 and sometimes employed as an activating lever for a chain brake. 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. Low-Kickback Chain: A chain that complies with the kickback performance requirements of ANSI B175.1 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 signifi­cantIy. Replacement Saw Chain: A chain that complies with the kickback performance requirements of ANSI B175.1 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. Spike Bar (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. Lock-Off Button: A movable stop that prevents the unintentional operation of the switch until manually actuated.