Patriot Products 1900 instruction manual Chain Brake and CKA Angle, Resent and YOU should not AS

Reduced Kickback Symmetrical Guide Bar

Small Radius Tip

Symmetrical Guide Bar

Large Radius Tip

S Low--Kickback Chain, designed with a contoured depth gauge and guard link which deflect kickback force and allow wood to gradually ride into the cutter. Low-- Kickback Chain has met kickback per- formance requirements when tested on a representative sample of chain saws be- low 3.8 cubic inch displacement specified in ANSI B175.1.

Contoured Depth Gauge

		Elongated Guard Link
	Deflects
Low---Kickback	kickback force
	and allows wood
Chain
	to gradually ride
	into cutter

can be caused by allowing contact of the bar tip in the danger zone with any hard object. Kickback can also be caused by pinching the saw chain along the top of the guide bar. This action may push the guide bar rapidly back toward the operator. Either of these events may cause you to lose control of the saw which could result in serious injury or even death. DO NOT RELY UPON ANY OF THE DEVICES BUILT INTO YOUR SAW. YOU SHOULD USE THE SAW PROPERLY AND CAREFULLY TO AVOID KICKBACK. Re- duced--kickback guide bars and low--kick- back saw chains reduce the chance and magnitude of kickback and are recom- mended. Your saw has a low kickback chain and bar as original equipment. Repairs on a chain brake should be made by an autho- rized servicing dealer. Take your unit to the place of purchase if purchased from a ser- vicing dealer, or to the nearest authorized master service dealer.

STip contact in some cases may cause a light- ning fast reverse REACTION, kicking guide

bar up and back toward operator.

SPinching the saw chain along the top of the

guide bar may push the guide bar rapidly back toward the operator.

SEither of these reactions may cause you to lose control of the saw which could result in serious injury. Do not rely exclusively upon devices built into your saw.

					WARNING:		Computed kickback
			Can Obstruct Material		angle (CKA) listed on your saw and listed in the
Not a Low---Kickback Chain					CKA table below represents angle of kickback
					your bar and chain combinations will have
S Front Hand Guard, designed to reduce the
					when tested in accordance with CSA (Cana-
chance of your left hand contacting the
					dian Standards Association) and ANSI stan-
chain if your hand slips off the front handle-
					dards. When purchasing replacement bar and
bar.
					chain, considerations should be given to the
S Position of front and rear handlebars, de-
					lower CKA values. Lower CKA values repre-
signed with distance between handles and
					sent safer angles to the user, higher values in-
“in-line” with each other. The spread and
					dicate more angle and higher kick energies.
“in-line” position of the hands provided by
					Computed angles represented indicate total
this design work together to give balance
					energy and angle associated without activation
and resistance in controlling the pivot of
					of the chain brake during kickback. Activated
the saw back toward the operator if kick-
					angle represents chain stopping time relative to
back occurs.
					activation angle of chain break and resulting
CHAIN BRAKE AND CKA ANGLE
					kick angle of saw. In all cases lower CKA val-
S Chain Brake, designed to stop the chain in					ues represent a safer operating environment
the event of kickback.					for the user.
WARNING: WE DO NOT REP-					The following guide bar and chain combina-
					tions meet kickback requirements of CSA
RESENT AND YOU SHOULD NOT AS-					Standards Z62.1, Z62.3, & ANSI B175.1
SUME THAT THE CHAIN BRAKE WILL					when used on saws listed in this manual.
PROTECT YOU IN THE EVENT OF A					Use of bar and chain combinations other
KICKBACK. Kickback is a lightning fast ac-					than those listed is not recommended and
tion which throws the bar and rotating chain					may not meet the CKA requirements per
back and up toward the operator. Kickback					standard.
Computed kickback angle (CKA) Table
			BAR
MODEL		P/N		Length	CHAIN P/N	CKA without chain brake
1900	952044366			12!	952051208		4_

5