DeWalt DW474 User manual

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS, OR ANY
DeWALT TOOL, CALL US TOLL FREE AT I{üF+DE\IVALT (1€æ43}925S).
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ROTATABLE'
STEEL GUARD
DgWALT...BU, LT J O BSITE TO U Grl
DeWALT high performance industrial tools are made lor America's
toughest industrial and construction applications. The design of every
tool in the line - from drills to sanders to grinders - is the resuli of
rigorous use on jobsites and throughout industry. Each tool is
produced with painstaking precision using advanced manufacturing
systems and intense qualiÿ control. Every tool is checked before it
leaves the factory to make sure that it meets your standards for
durabiliÿ, reliabiliÿ and power.
DeWALT Built Jobsite Tough...WE GUARANTEE lT.
.-':r.:,. :-r1,,-+;-Ë.4§*æ++
lmportant Salety lnstructions
WARNING: When using electric tools, basic safety precautions
should always be followed to reduce risk of fire, electric shock, and
personal inlury, including the following:
READ ALL INSTRUCTIONS
Double lnsulation
Double insulated tools are constructed throughout with two separate
layers of electrical insulation or one double thickness of insulation
between you and the tool's electrical system. Tools built with this
insulation system are not intended to be grounded. As a result, your
tool is equipped with a two prong plug which permits you to use
extension cords without concem for maintaining a ground connection.
NOTE: Double insulation does not take the place of normal safeÿ
precautions when operating this tool. The insulation system is for
added protection against injury resulting from a possible electrical
insulation failure within the tool.
CAUTION: WHEN SERVICING USE ONLY IDENTICAL
REPLACEMENT PARTS. Repair or replace damaged cords.
Polarized Plugs
Polarized plugs (one blade is wider than the other) are used on
equipment to reduce the risk of electric shock. When provided, this
plug will fit into a polarized outlet only one way. lf the plug does not fit
fully in the outlet, reverse the plug. lf it still does not fit, contact a
qualified electrician to install the proper outlet. Do not change the plug
in any way.
Salety Instruclions For All Tools
. KEEP WORK AREA CLEAN. Cluttered areas and benches
invite injuries.
. CONSIDER WORK AREA ENVIRONMENT. Don't expose
power tools to rain. Don't use power tools in damp or wet
locations. Keep work area well lit. Do not use tool in presence
of flammable liquids or gases.
GUARD AGAINST ELECTRIC SHOCK Prevent boÜ contact
with grounded surtaces. For example; pipes, radiators, ranges,
and refrige rator enclosu res.
KEEP CHILDREN AWAY. Do not let visitors contact tool or
extension cord. All visitors should be kept away from work
area.
STORE IDLE TOOLS. When not in use, tools should be stored
in dry, and high or locked-up plaæ - out of reach of children.
DON'T FORCE TOOL. lt will do the iob better and safer at the
rate for which it was intended.
llSE RIGHT TOOL. Don't torce small tool or attachment to do
the iob of a heavy-duty tool. Don't use tool for purpose not
intended.
DRESS PROPERLY. Do not wear loose clothing or iewelry.
They can be caught in moving parts. Rubber gloves and non-
skid tootwear are recommended when working outdoors. Wear
protective hair covering to contain long hair.
USE SAFETy GLASSES. Also use face or dust mask if
operation is dusÿ.
DON'T ABUSE CORD. Never carry tool by cord or yank it to
disconnect from receptacle. Keep cord from heat, oil, and
sharp edges.
SECURE WORK. Use clamps or a vise to hold work. lt's safer
than using your hand and it frees both hands to operate tool.
DON'T OVERREACH. Keep proper footing and balance at all
times.
MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean
for better and safer pertormance. Follow instructions for
lubricating and changing accessories. lnspect tool cords
periodically and if damaged, have repaired by authorized
1
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seruice facilÿ. lnspæt ertension ærds peiodically and replace if
damaged. Keep handles dry, clean, and lree from oil and grease.
DISCONNECT OR LOCK OFF TOOLS when not in use, before
seruicing, and when changing accessories, such as blades, bits,
cutters.
REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of
checking to see that keys and adjusting wrenches are removed from
tool before tuming it on.
AVOID UN,NTENTIONAL STARTING. Don't carry tool with finger
on switch. Be sure switch is off when plugging in.
EXTENSION CORDS. Make sure your ertension cord is in good
condition. When using an ertension cord, be sure to uæ one heavy
enough to cany the cunent your product will draw. An undersized
cord will cause a drop in line voltage resulting in lo*s of power and
overheating. The following table shows the correct size to use
depending on cord length and nameplate ampere rating. lt in doubt,
use the next heavier gage. The smaller the gage number, the
heavier the cord.
OUTDOOR USE EXTENSION CORDS. When tool is used
outdoors, use onÿ ertension cords intended lor use outdoors and
so marked.
STAY ALERT. Watch what you are doing. Use common sense. Do
not operate tool when you are tired.
. CHECK DAMAGED PARTS. Before tufircr use of thë tool, a guard
or other part that is damaged should be carefully cheçked to
determine that it will operate properly and pertorm its intended
function. Check for alignment of moving pails, binding of moving
parts, breakage of pafts,. mounting, and any other conditions that
may atfect its operation. A guard or other part that is damaged
should be properly repaired or replaced by an authorized seruice
center unless otherwise indicated elsewhere in this instruction
manual. Have defective switches replaced by authorized service
center. Do not use tool if switch does not tum it on and off.
. ALWAYS WEAR EYE PNOTECNON.
. KEEP GIIARDS lN PLACE.
. Use only grinding wheels having a maximum operating speed at
least high as "No Load RPM" marked on the tool's nameplate.
. Before using, inspect reæmmended accessory for cracks or flaws. lf
such a crack or flaw is evident, discard the accessory. The
accessory should also be inspected whenever you think the tool
may have been dropped.
When btaiing the tool (with a new or replacement wheel installed)
hold the tool in a well protected area and let it run for one minute. lf
the wheel has an undetected crack or ftaw, it shoutd burst in tess
than one minute. Never stan the tæl with a person in line with the
wheel. This includes the operator.
ln operation, avoid bouncing the wheel or giving rt rough treatment.
lf this occurs, stop the tool and inspect the wheet.
ALWAYS USE GUARDS with depressed center wheels or flaring
cup ginding wheels.
Clean your tool out periodically.
CAUTION: Some wood contains preservatives such as copper
chromium arsenate (CCA) which can be toxic. When sanding these
materials extra care should be taken to avoid inhalation and
minimize skin contact.
SAVE THESE INSTRUCTIONS FOR FUTURE USE
Volts
r20v
I hon
Minimum Goge for Cond Sets
Totul tengrh of Cond in Feet
o-25 26-50 5t -l 00 I 0t -150
Not more
Thon Americon Wire Goge
0
6
l0
12
6 t8
10 t8
12 16
t6
l6
l6
l6
14
1À
14
12
12
16 14 12 Not Recommenderl
COUNTER CLOCKWISE
Ftc.s -
FIG.1
NOTE: The Guard will fit in
one position. lf the holes are
not aligned, rotate Guard
until they are. FlG. 4
LOCK
BUTTON
BACKING
HUB
FIBRE
Guard lnstallation (FlG.l )
Turn off and unplug grinder.
A wheel guard is packed with your grinder that must be used
whenever using a depressed center grinding wheel.
NOTE: A special guard is required for use with a Flaring Cup Wheel.
Do not attempt to use a flaring cup wheel with the wheel guard
supplied with your grinder. (See page 4.)
To install the guard to the grinder, place it over the spindle, as shown
in Figure 1, and install the provided three socket head screws
(5/32" hex) and lock washers in the three holes in the housing adjacent
to the spindle. Tighten these screws securely.
NOTE: The guard will only fit in one position. lf the holes are not
aligned, loosen the hex nut, rotate guard until they are and retighten
the hex nut.
An adjustable skirt guard is available at extra cosl lor use with flaring
cup wheels only. (wheels also available at extra cost) The adjustable
skirt guard installs to the same center three holes used to mount the
wheel guard included with the tool. The depressed center wheèl guard
must be removed before mounting the adjustable skirt guard.
NOTE: NEVER ATTEMPT TO USE ANY TYPE OF GRINDING
WHEEL WITHOUT THE PROPER GUARD. TO DO SO WOULD BE
EXTREMELY HMARDOUS.
Swr'tch Operation (FIG. 2,
To start tool press buttons A and B at the same time. For continuous
operation with switch locked ON press only button B. To release
switch press button A and release.
LOGK
BUTTON
SANDING
DISC
BACKING
CLOCKWISE

Auxiliary llandle (FIG. 3l
An auxiliary handle is fumished with your grinder and can be installed
on either side of the front housing, as shown in Figure 3. This handle
SHOULD BE USED AT ALL TIMES to maintain complete control of
the tool.
Spindle Lock Button (FtG. 3)
Turn off and unplug grinder.
ln order to prevent the spindle of the tool lorm rotating while installing
or removing accessories, a spindle lock button has been provided in
the gear head of the machine, as shown in Figure 4. To lock the
spindle, depress and hold the lock button. NEVER DEPRESS THE
LOCK BUTTON WITH THE TOOL RUNNING OR COASTING.
Sanding Discs (FIG, 4)
NOTE: The guard need not be used with sanding discs.
TO INSTALL SANDING DISCS:
Be sure that the tool is unplugged. Push the hub of the clamp washer
through the center oI the sanding disc, as far as it will go, and also through
ûre backing disc. Pr.i the backing hub on the tool spindle. lnstall the clamp
washer on the tool spindle and thread the assembly clockwise, completeÿ
down on the spindle. Engaç the lock button.
When using a sanding disc, hold the tool so that an angle of 10'to 15"
exists beùreen the disc and the work. lf onÿ the outer edge of the disc is
used a rough crÎ surlace will result. lf the disc is pressed flat against the
work the surface will be inegular and bumpy, and the tool will be difficult to
control.
See page 7 for a æmplete descripüon of usage and mounüng altematives.
Removing Disc (FIG. 5l
Using a cloth or glove to protect your hand, turn the disc assembly
counterclockwise to remove it from the tool spindle. Engage lock button.
Depressed Center Wheels (FtG. 6t
Depressed center wheels may be used lor moderate metal removal on
flat or contoured surfaces.
CAUTION: Never use depressed center wheels without the proper
guard. TO INSTALL DEPRESSED CENTER WHEELS:
1. Be sure tool is disconnected from power supply and switch is in
OFF position.
2. Be sure the guard assembly is securely attached to the spindle
housing.
BACKING HUB
i;rry SCREWS
FLARING
CUP
WHEEL
CLAMP
FIG.7
3. Put the backing hub onto the tool spindle.
4. Check rated speed on depressed center wheel. Never use wheel with
rated speed lower than the speed in the'WARNING' statement on the
nameplate of the tool
5. Place the depressed center wheel on the tool spindle.
6. Thread the clamp washer on tool spindle, hold the tool spindle by
engaging the lock button, and tighten clamp washer with ppanner
wrench.
See page T lor a complete description ol usage and mounting alternatives.
When using a depressed center wheel, hold the tool so that an angle of
approximately 30o exists between the wheel and the work.
Wire Brushing
1. Disconnect tool from power source. Rest grinder on its back with
spindle facing up.
2. Thread wire cup brush onto spindle and tighten.
3. Common applications for wire cup brushes include cleaning welds,
angles, corners and removal of paint.
4. Always wear eye protection and appropriate protective clothing.
Flaring Cup Wheels (FIG. fl
Use flaring cup wheels for smoothing welds, casting ridges, or large metal
areas, cutting off studs, bolts, rivets, etc. A 5/8' - 11 thread bushing in the
wheel threads directly on the tool spindle. Flaring Cup Wheels should
only be used in conjunction with the correct size adjustable skirt guard.
Disconnect the tool from the power supply. Attach guard with the open
paft of the guard facing away from the operator. Tighten mounting screws
to sêcure guard in place. Hold down the spindle lock button and
thread the flaring cup wheel onto the spindle. Be sure that the wheel is
firmly and completely threaded onto the spindle. Loosen screws
holding the adjustable skirt part of the guard and slide the skirt down
until about 1/4" of the llaring cup wheel is exposed. Tighten screws.
When using tool, tilt tool slightly-do not hold wheel perfectly flat
against the work. Avoid bouncing the wheel or giving it rough
treatment, since cracks might develop which would cause the wheel
to fly apart. Always check the wheel for cracks before using it, and
always use a wheel guard.
Maintenance ol Tool
Cleaning
Blowing dust and grit out oI the motor housing using compressed air is
a necessary regular maintenance procedure. Dust and grit containing
metal particles often accumulate on interior surfaces and could create
an electrical shock hazard if not frequently cleaned out.
CAUTION: Never use solvenls or other harsh chemicals for cleaning
the non-metallic parts of the tool. Use clean, dry rag only.
Lubrication
DeWALT tools are properly lubricated at the factory and are ready for
use. Tools should be relubricated regularly every sixÿ days to six
months, depending on usage. (Tools used constantly on production or
heavy-duÿ iobs and tools exposed to heat may require more frequent
lubrication.) This lubrication should only be attempted by trained
power tool repairpersons.

lmportant
To assure product SAFEIY and RELIABILITY, repairs, maintenanc€,
and adjustment should be performed by DeWALT certilied service
centers or other qualified service organizations. These service
organizations service DEWALT tools always using DeWALT
replacement parts.
Black & Decker (U.S.) lnc., industrial tool service centers are certified
for serving DeWALT industrial tools.
Aceessorr'es
AccessoryType Notes Usage
DEPRESSED
CENTER
WHEEL
Use Guard
Supplied with
Tool
Use for moderate
metal & mÉsonry
removal on flat or
contoured surfaces
FLARING CUP
GRINDING
WHEELS
Use Flaring Cup
Wheel Guard of size
to match wheel
Use for smoothing
welds, and sharp
edges, and automotive
body parts
W|RE CUP
BRUSHES Always wear eye protection and
appropriate clothing
Use lor rust removal
and surface preparation
before painting
* Depressed center grinding wheels must fit within the cpnfines of the
guard and must be rated higher than the recommended speed as
marked on the nameplate.
** When using flaring cup wheels, always use skirt guard (4" only).
Guards are available at Black & Decker (U.S.) lnc., industrial service
centers.
WARNING-To reduce the risk ol injury, always use proper guards
when grinding and wear eye protection.
"' CAUTIOI{: S:trands of wire anp brushes rnay break and fly oft whlle
in use. Users and oüprs in ths area should wear adegueb qn, lace
and body protection. Use onÿ wire cup brush€s thet aro ratêd at or
gr€ater than the RPM shovn on the tool's nameplate.
lf you need any assistrarrce in locating any acoessory, pleass oontact
DEWALT lndustrial Tool Cornpany, 626 Hanorrer Pike, P.O. Box 158,
Hampstead, MD 21 074 or call 1 -8ü)-4-DEWALT (1 -80G.til3-9258).
Full Wananÿ
DEWALT heavy duÿ industrial tools are warranted for one year from
date of purchase. We will repair, without charge, any defects due to
faulÿ materials or wgrkmanship. Arrangements have been made with
the industrial tool division of Black & Decker (U.S.) lnc. to provide
warranty repairs for DeWALT tools. Please retum the complete unit,
transportation prepaid, to any Black & Decker (U.S.) lnc. industrial
service center or authorized service station listed under "Tools,
Electric" in the yellow pages. This warranty does not apply to
accessories or damaç caused where repairs have been made or
attempted by others. This warranÿ gives you specific legal rights and
you may have other rights which vary from state to state.
ln addition to the warranty, DeWALT tools are covered by our:
30 DAY NO RISK SATISFACTTON GUARANTEE
lf you are not completely satisfied with the performance of your
DeWALT heavy duty industrial tool, simply return it to the
participatlng seller within 30 days for a full refund. Please return
the complete unit, transportation prepaid. Proof of purchase may
be required.
See 'Tools-Electric'
-Yellow Pages-
for Service & Sales
For Sandlng Applicatlons For Sanding Applicâtlons
For use with all 7' Itlodels For usê with all 7" Models For Grinding Appllcations For Grinding Applications
For use with all 7" Models
For llllire Brush
Applications
For use with all T" Models
For use with all 7' Models
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