Makita 5740NB User manual

Circular Saw
5740NB
185 mm (7-1/4") MODEL 5740NB
298" 3.5kg
4,700
(1 1-23/32") (7.7 Ibs)
64" 42"
:;-:z'T (2-1/2") (1-5/8")
INSTRUCTION MANUAL
KLAETION
SPECIFICATIONS
Max. cutting capacities N~ loadspeed overall Net
Mode' I di%t?er 1-1 (RPM) I length 1 weight
* Manufacturer reserves the right to change specifications without notice
* Note: Specifications may differ from country to country.

GENERAL SAFETY RULES
(For AllTools)
WARNING! Readand understandall instructions. Failure
to follow all instructions listed below,
may result in electric
shock, fire and/or serious personalinjury.
SAVE THESE INSTRUCTIONS
READALL INSTRUCTIONS.
1. Keep your work area cleanandwell lit. Clutteredbenches and dark areas invite
accidents.
2. Donotoperatepowertools in explosiveatmospheres, suchas in thepresence
of flammable liquids, gases,
or dust. Power tools create sparks which may
ignitethe dust or fumes.
3. Keep bystanders, children, and visitors away while operating a power tool.
Distractionscan causeyouto loosecontrol.
4. DoubleInsulatedtoolsareequippedwithapolarizedplug(onebladeiswider
than the other.) This plug
will fit in a polarized outlet only one way. If the
plug does not
fit fully in the outlet, reversethe plug. If it still does notfit,
contact a qualified electrician to install a polarized outlet. Do not change
thepluginany way. Double insulation eliminatesthe needfor the three wire
groundedpower cordandgrounded power supply system.
5. Avoid body contact withgroundedsurfacessuch as pipes, radiators, ranges
and refrigerators. There
is an increased risk of electric shock if your body is
grounded.
6. Don't expose power tools torain or wet conditions. Water entering a power
toolwill increasethe risk
of electricshock.
7. Do notabusethe cord. Never usethe cordtocarry thetools or pulltheplug
from an outlet. Keep cord away from heat, oil, sharpedges
or movingparts.
Replacedamagedcordsimmediately. Damagedcordsincreasethe riskof electric
shock.
8. Whenoperating a powertooloutside, usean outdoor extension cordmarked
"W-A"
or "W." These cords are rated for outdoor use and reduce the risk of
electricshock.
9. Stayalert, watchwhatyouaredoingandusecommonsensewhen operating
a power tool. Do not use tool while tired
or under the influence of drugs,
alcohol,
or medication. A moment of inattention while operating power tools
may resultinserious personalinjury.
10. Dressproperly. Donotwear looseclothing or jewelry. Containlonghair. Keep
your hair, clothing, andglovesawayfrom movingparts. Looseclothes, jewelry
or longhair can becaught inmovingparts.
2

11. Avoid accidental starting. Be sure switch isoff before plugging in. Carrying
tools with your finger
on the switch or plugging in tools that have the switch
on invitesaccidents.
12. Remove adjusting keys or switches beforeturning the tool on. A wrench or
a keythat isleftattachedtoarotatingpartof thetool mayresult inpersonal injury.
13. Donotoverreach. Keepproper footingandbalanceatalltimes. Properfooting
andbalanceenablesbetter controlof thetool inunexpected situations.
14. Use safety equipment. Always wear eye protection. Dust mask, non-skid
safety shoes, hard hat, or hearing protection must be used for appropriate con-
ditions.
15. Use clamps
or other practical way tosecure and support the workpiece to
a stable platform. Holding the work by hand or against your body is unstable
and may leadto lossof control.
16. Do notforce tool. Use the correct toolfor your application. The correct tool
will dothejob betterand safer atthe ratefor which itisdesigned.
17. Do not use tool if switch does notturn
it on or off. Any tool that cannot be
controlledwiththe switch isdangerousand mustberepaired.
18. Disconnectthe
plug fromthepower source beforemakingany adjustments,
changing accessories, or storing the tool. Such preventive safety measures
reducethe riskof startingthetoolaccidentally.
19. Store idle tools out of reach of children and other untrainedpersons.
Tools
are dangerous inthe hands of untrained users.
20. Maintain tools with care. Keep cutting tools sharp and clean. Properly
maintained tools, with sharp cutting edges are less likely to bind and are easier
tocontrol.
21. Checkfor misalignmentor
binding of movingparts, breakage of parts, and
any other condition that may affect the tools operation.
If damaged, have
thetoolservice beforeusing. Many accidents are caused by poorly maintained
tools.
22. Use only accessories that are recommended bythe manufacturer for your
model. Accessories that may be suitable for one tool, may become hazardous
whenusedon another
tool.
23. Tool service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel could result in a risk of
injury.
24. When servicing a tool, use only identicalreplacement parts. Follow instruc-
tions
in the Maintenance section of this manual. Use of unauthorized parts
or failure to follow Maintenance Instructions may create a risk
of electric shock
of injury.
3

SpecificSafetyRules
1. DANGER! Keep hands away from cuttingarea and blade. Keep your second
handon auxiliary handle,
or motor housing. If both handsare holdingthe saw,
they cannotbecut bythe blade.
Keep your body positioned to either side of the saw blade,
but not in line
with the saw blade. KICKBACK could cause the
saw to jump backwards. (See
"Causes and Operator Prevention of Kickback")
Do notreach underneath thework while blade is rotating. The guard can not
protectyou from the blade below the work. Don't attempt to removecut material
when blade
is moving
CAUTION: Blades coast after turn off.
2. Check lower guardfor proper closing before each use. Donot operate saw if
lower guard does notmovefreely and closeinstantly. Never clamp
or tiethe
lower guard intothe open position. If saw
is accidentally dropped, lower guard
may be bent. Raise the lower guard with the RetractingHandle and make sure it
movesfreelyanddoesnottouchthe blade
or any otherpart, in all anglesanddepths
of cut.
3. Checktheoperationandconditionof thelowerguardspring. If theguard and
thespringarenotoperatingproperly,theymustbeservicedbeforeuse. Lower
guardmayoperatesluggishlydueto damagedpartsgummydeposits,or
a buildupof
debris.
4. Lower guard should be retracted manually only for special cuts such as
"Pocket Cuts." and "Compound Cuts." Raise lower guard by Retracting
Handle.As soon as bladeentersthe material, lower guard must bereleased.
For
all other sawing, the lower guardshould operateautomatically.
5. Alwaysobservethatthelowerguardiscoveringthebladebeforeplacingsaw
downonbench
or floor. An unprotected,coastingbladewill causethe sawto walk
backwards,cuttingwhatever is initspath.Beawareof thetimeittakesfor theblade
to stopafterswitchis released.
6. NEVER holdpiecebeingcut in your hands or acrossyour leg. Itis importantto
supportthe work properly to minimizebodyexposure, bladebinding,or
loss of con-
trol.
7. Holdtoolbyinsulatedgripping surfaceswhenperforminganoperation where
the cutting tool may contact hidden
wiring or its own cord. Contact with a
"live" wirewillalsomakeexposedmetalpartsof thetool "live" andshockthe oper-
ator.
8. When rippingalwaysusea rip fence or straight edgeguide. This improvesthe
accuracyof cutandreducesthe chancefor blade binding.
9. Always use blades with correct size and shape (diamond vs. round) arbor
holes. Bladesthat do not matchthe mountinghardware of the saw will runeccen-
trically, causing
loss of control.
10. Neverusedamaged or incorrectbladewashers or bolts.The bladewashers and
boltwere specially designed for your saw, for optimum performanceand safety
or
operation.
4

11. CausesandOperator Prevention of kickback:
Kickback is a sudden reaction to apinched, bound or misaligned saw blade, caus-
ing an uncontrolled saw to lift upand out of the workpiece toward the operator.
When the blade is pinched or bound tightly by the kerf closing down, the blade
stalls and the motor reaction drives the unit rapidly back toward the operator.
If the blade becomes twisted or misaligned in the cut, the teeth at the back edge
of the blade can dig into the top surface of the wood causing the blade to climb
out of the kerf andjump back toward operator.
Kickbackis the result of tool misuseand/or incorrect operating procedures or con-
ditions and can be avoided by taking proper precautions as given below.
Maintainafirmgrip with bothhandsonthesaw andpositionyour body and
arm to allow you to resist KICKBACK forces. KICKBACK forces can be con-
trolled by the operator,
if proper precautions are taken.
When blade is
binding, or when interrupting a cut for any reason, release
the trigger and hold the saw motionless
in the material until the blade
comestoa completestop. Never attempttoremovethesawfrom thework
or pull the saw backward while the blade is in motion or KICKBACK may
occur. Investigate and take corrective actions to eliminate the cause
of blade
binding.
When restarting a saw
in the workpiece, center the saw blade in the kerf
and check that saw teeth are not engaged into the material. If saw blade is
binding, it may walk up or KICKBACKfrom the workpiece
as the saw is restarted.
Support large panelstominimizethe risk
of blade pinchingand KICKBACK.
Large panels tendto sag under their ownweight. Supports must be placed under
the panel on both sides, near the line
of cut and near the edge of the panel as
shown in Fig.
1.
To minimize the risk of blade pinching and kickback. When cutting operation
requires the resting
of the saw on the workpiece, the saw shall be rested on the
large position andthe smaller piece cut off.
To avoid kickback do support
board or panel near the cut.
Fig. '
Don't support board or panel
away from the cut.
Fig. :
5

Do not use dull or damaged blade. Unsharpenedor improperly set blades produce
narrow kerf causing excessive friction, blade bindingand KICKBACK.
Blade depth and bevel adjusting locking levers must be tight and secure before
making cut. If blade adjustment shifts while cutting,
it may cause binding and
KICKBACK.
Use extra caution when making a "Pocket Cut" into existingwalls or other
blind areas. The protruding blade may cut objects that can cause KICKBACK.
NEVER place your hand or fingers
behindthe saw. If kickback occurs,
the saw could easily jump backwards
over your hand, possibly causing
severe injury.
Fig.
12. Adjustments. Beforecuttingbesuredepthandbeveladjustmentsare tight.
13. AvoidCuttingNails. Inspectfor andremoveall nailsfromlumber beforecut-
ting.
14. When operatingthesaw, keep the
cord away from the cutting area
andposition
it so that it will notbe
caughtontheworkpieceduringthe
cuttingoperation.
Operate
with proper hand support,
proper workpiece support, and sup-
plycordroutingaway from thework
area.
A typicalillustration of properhand
support,workpiece support,and
supply cord routing.
Fig. 4
WARNING:
It is important tosupport the workpiece properly andtoholdthe saw firmlyto
prevent
loss of control which could cause personalinjury. Fig. 4 illustratestypi-
calhandsupport or thesaw.
6

15. Placethe wider portion of the saw base onthat part of the workpiece which is
solidly supported, not on the section that
will fall of when the cut is made. As
examples, Fig.
5 illustratestheRIGHTwaytocut off theendof aboard, and Fig. 6
theWRONGway. If theworkpiece isshortorsmall, clamp it down. DON'TTRY TO
HOLDSHORT PLACESBY HAND!
Fig. !
Fig. 6
16. Never attempt to saw with the cir-
cular saw heldupsidedown
in a vise.
This isextremelydangerous and can
leadtoserious accidents.
Fig. 7
17. Beforesettingthetooldownafter completingacut, besurethatthelower (tele-
scopingl guardhasclosedandthebladehascometoacomplete
stop.
7

SYMBOLS
The followings show the symbols used for tool.
................................. volts
................................. amperes
................................. herts
................................. kilograms
................................. hours
................................. minutes
................................. seconds
................................. alternating current
................................. direct current
................................. no loadspeed
E
A
AA
.. ./min
................................. alternating or direct current
................................. Class II Construction
................................. splash-proof construction
................................. watertight construction
................................ revolutions or reciprocationper min
c!- ................................. number of blow
8

Removing or installing saw blades
CAUTION:
Always be sure that the tool is switched off and unpluggedbefore removingor installing
Fig. 8
the blade.
To remove the blade, press the shaft lock
so that the blade cannot revolve and use
the hex wrench to loosen the hex bolt
counterclockwise. Then remove the hex
bolt,outer flange and blade.
To installthe blade, follow the removalpro-
I
cedure in reverse.
BE SURE
TO TIGHTEN THE HEX SOCKET
HEADBOLTSECURELY.
Inner flange
yyv ' Saw blade
Outer flame
I
Fig. !
9

CAUTION:
*Be sure the blade is installedwith teeth pointing up
at the front of the tool.
*Use only the Makitahex wrench to installor removethe blade.
*The inner flange has
a 20 mm(13/16") diameter on one side and a 19mm (3/4") diame-
ter onthe other. The sidewith 19
mm (3/4")diameter is markedby "19". Usethe correct
side for the hole diameter of the blade you intend to use. Mounting the blade on the
wrong side can result indangerousvibration.
Inner flange
Mountingshaft
Outer flange
Hex socket head bolt
Blade
Fig. 1'
Adjusting depth of cut
Loosen the screw on the depth guide and
movethe baseupor down.
At the desired depth of cut, secure the
baseby tightening the screw.
I
Fig. 11
CAUTION:
*Use
a shallow depth of cutwhen cuttingthin workpiece for cleaner,safer cuts.
*After adjustingthe depth of cut, always tighten the screw securely.
10