Alpha WDP-120 User manual

Model No.: WDP-120
Version 3
Alpha®Wet/Dry Polisher
Instruction Manual
MANUAL
103 Bauer Drive, Oakland, NJ 07436 • 800-648-7229 • Fax: [phone]
www.alpha-tools.com
WARNING: To reduce the risk of injury, user must read and understand instruction manual!

2
TABLE OF CONTENTS
WDP-120 Overview....................................................................................................3
Specications ............................................................................................................3
 Accessories .....................................................................................................4
 Attachment-Guard.........................................................................................5
Introduction................................................................................................................6
 AboutTheSymbols.........................................................................................6
 ElectricalSymbols ..........................................................................................6
GeneralSafetyRules.................................................................................................7
 WorkArea.........................................................................................................7
 ElectricalSafety...............................................................................................7
 PersonalSafety ...............................................................................................7
 ToolUseandCare ...........................................................................................8
Service..............................................................................................................8
 SpecicSafetyRules ......................................................................................9
 UseProperExtensionCords........................................................................10
 GroundingInstructions ................................................................................10
 AdditionalPrecautionsForUsingTheWDP-120........................................10
 LawsAndRegulationsOfNoiseLevels......................................................11
GuardInstallation....................................................................................................12
AttachingABackerPadToWDP-120 ....................................................................13
AttachingRubberCapToWDP-120.......................................................................13
WDP-120WetOperation .........................................................................................14
WDP-120DryOperation..........................................................................................14
WDP-120PolishRightUptotheWall ....................................................................15
WDP-120Wet/DryConcretePolisherOperation...................................................16
 MainConnection ...........................................................................................16
 SwitchingOnAndOff ...................................................................................16
 GroundFaultCircuitInterrupter(GFCI) ......................................................17
 TestingIn-lineGFCIUnit(BeforeEachUseOfThePolisher) ...................18
 VariableSpeedAdjustment ..........................................................................18
 SpeedPotFeedbackSensor ........................................................................19
 WaterControlValve.......................................................................................19
 Water-FeedAttachment ................................................................................20
MAINTENANCE.......................................................................................................20
 Bearingsandgears .......................................................................................21
 CarbonBrushReplacement ........................................................................21
 RearCoverRemoval .....................................................................................22
Alpha®WDP-120Schematic ..................................................................................27
Alpha®WDP-120GuardSchematic........................................................................28
Alpha®WDP-120Partslist ......................................................................................29
LoanerProgram.......................................................................................................32
Warranty ...................................................................................................................32
AppendixA..................................................................................................................i
 FrequentlyAskedQuestions...........................................................................i
ProductRegistrationCard......................................................................................33

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WDP-120 OVERVIEW
SPECIFICATIONS
Rating ............................................................................120 V
Amperage......................................................................7A
Wattage..........................................................................800W
Speed(Variable) ...........................................................500~2800RPM
Weight ......................................................................... 7.3Lbs/3.3kg
Spindle ........................................................................ 5/8”-11
Figure-1
WET
DRY

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ACCESSORIES

5
ATTACHMENT-GUARD
Connector
MainUnit
SubCover
HalfCover
COMPONENTS:
1. MainUnit
2. Connector
3. HalfCover
4. SubCover
Figure-3

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INTRODUCTION
ThankyouforpurchasingtheAlpha®Wet/DryConcretePolisher.Pleasereadthis
instructionmanualthoroughlytoensuresafetyandcorrectuseofthepolisher.Keep
thismanualinaplacewhereoperatorscanaccessiteasilywhenevernecessary.
ABOUTTHESYMBOLS
According to the hazard level, all safety notes in this manual are classied into
“DANGER”,“WARNING”,and“CAUTION”.
DANGER! Death or serious personal injury is imminent when handling
thispolisherincorrectly.
WARNING! Thereisapossibilityofdeathorseriouspersonalinjurywhen
handlingthispolisherincorrectly.
CAUTION! Thereis a possibility of personal injuryorpropertydamage
whenhandlingthispolisherincorrectly.
NOTE:Insomesituations,failingtoobserveWARNINGnotescouldresultin
deathorseriouspersonalinjury.Besuretoreadandobservethesafetynotes
toensuresafetyandcorrectuseofthepolisher.
ELECTRICALSYMBOLS
Thefollowingshowthesymbolsusedfortool.
V Volts
A Amperes
Hz  Hertz
~ora.c. AlternatingCurrent
n0  Noloadspeed
…/min Revolutionorreciprocationperminute
kg  Kilograms
ProtectiveEarth

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CAUTION!
Thefollowingareimportantnotesforproducts,operation,andmaintenanceappli-
cabletothispolisher.
GENERALSAFETYRULES
WORKAREA
• Keepyourworkareacleanandwelllit.Clutteredbenchesanddarkareasinvite
accidents.
• Donotoperatepowertoolsinexplosiveatmospheres,suchasinthepresence
ofammableliquids,gases,ordust.Powertoolsmaycreatesparkswhichmay
ignitethedustorfumes.
• Keepbystanders,children,andvisitorsawaywhileoperating a powertool.
Distractionscancauseyoutolosecontrol.
ELECTRICALSAFETY
• Groundedtoolsmustbepluggedintoanoutletproperlyinstalledandgrounded
inaccordancewithallcodesandordinances.Neverremovethegroundingprong
ormodifythepluginanyway.Donotuseanyadaptorplugs.Checkwithaquali-
edelectricianifyouareindoubtastowhethertheoutletisproperlygrounded.
Ifthetools shouldelectricallymalfunctionorbreakdowngroundingprovidesa
lowresistancepathtocarryelectricityawayfromtheuser.
• Avoidbodycontactwithgroundedsurfaces,suchaspipes,radiators,ranges,
andrefrigerators.Thereisanincreasedriskofelectricshockifyourbodyis
grounded.
• Don’texposepowertoolstorainorwetconditions.Waterenteringapowertool
willincreasetheriskofelectricshock.
• Donotabusethecord.Neverusethecordtocarrythetoolsorpulltheplugfrom
anoutlet.Keepcordawayfromheat,oil,sharpedges,ormovingparts.Replace
damagedcordsimmediately.Damagedcordsincreasetheriskofelectricshock.
• Whenoperatingapowertooloutside,useanoutdoorextensioncordmarked
“W-A”or“W”.Thesecordsareratedforoutdooruseandreducetheriskof
electricshock.
PERSONALSAFETY
• Stayalert,watchwhatyouaredoingandusecommonsensewhenoperatinga
powertool.Donotusetoolwhiletiredorundertheinuenceofdrugs,alcohol,
ormedication.Amomentofinattentionwhileoperatingpowertoolsmayresult
inseriouspersonalinjury.
• Dressproperly.Donotwearlooseclothingorjewelry.Containlonghair.Keep
yourhair,clothing,andglovesawayfrommovingparts.Looseclothes,jewelry,
orlonghaircanbecaughtinmovingpartsordrawnintoairvents.
• Avoidaccidentalstarting.Besureswitchisoffbeforepluggingin.Carrying

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toolswithyourngerontheswitchorpluggingintoolsthathavetheswitchon,
invitesaccidents.
• Removeadjustingkeysorwrenchesbeforeturningthetoolon.Awrenchora
keythatisleftattachedtoarotatingpartofthetoolmayresultinpersonalinjury.
• Donotoverreach.Keepproperfootingandbalanceatalltimes.Properfooting
andbalanceenablesbettercontrolofthetoolinunexpectedsituations.Donot
useonaladderorunstablesupport.
• Usesafetyequipment.Alwaysweareyeprotection.Dustmask,nonskidsafety
shoes,hardhat,orhearingprotectionmustbeusedforappropriateconditions.
TOOLUSEANDCARE
• Useclampsorotherpracticalwaytosecureandsupporttheworkpiecetoa
stableplatform.Holdingtheworkbyhandoragainstyourbodyisunstableand
mayleadtolossofcontrol.
• Donotforcetool,usethecorrecttoolforyourapplication.Thecorrecttoolwill
dothejobbetterandsaferattherateforwhichitisdesigned.
• Donotusetoolifswitchdoesnotturnitonoroff.Anytoolthatcannotbe
controlledwiththeswitchisdangerousandmustberepaired.
• Disconnecttheplugfrompowersourcebeforemakinganyadjustments,chang-
ingaccessories,orstoringthetool.Suchpreventivesafetymeasuresreduce
theriskofstartingthetoolaccidentally.
• Storeidletoolsoutofthereachofchildrenandotheruntrainedpersons.Tools
aredangerousinthehandsofuntrainedusers.
• Maintaintoolswithcare.Keeptoolssharpandcleanforbetterandsaferperfor-
mance.Followinstructionsforlubricatingandchangingaccessories.Inspect
theelectricalcordperiodicallyandifdamaged,haveitrepairedbyauthorized
servicefacility.Inspectextensioncordsperiodicallyandreplaceifdamaged.
Keephandlesdry,cleanandfreefromoilandgrease.
• Checkfordamagedparts.Beforeusingthetooleachday,aguardorotherpart
thatisdamagedshouldbecarefullycheckedtodeterminethatitwilloperate
properlyandperform itsintendedfunction.Checkforalignmentofmoving
parts,breakageofparts,mounting,andanyotherconditionsthatmayaffectits
operation.Aguardorotherpartthatisdamagedshouldbeproperlyrepairedor
replacedbyanauthorizedservicecenterunlessotherwiseindicatedelsewhere
inthisinstructionmanual.Havedefectiveswitchesreplacedbyauthorizedser-
vicecenter.Donotusethetoolifitcannotbeturnedonandoffbytheswitch.
• Useonlyaccessoriesthatarerecommendedbythemanufacturerforyourmodel.
Accessoriesthatmaybesuitableforonetool,maybecomehazardouswhen
usedonanothertool.
SERVICE
• Toolservicemustbeperformedonlybyqualiedrepairpersonnel.Serviceor
maintenanceperformedbyunqualiedpersonnelcouldresultinariskofinjury.
• Whenservicingatool,useonlyidenticalreplacementparts.Followinstructions
intheMaintenancesectionofthismanual.Useofunauthorizedpartorfailure
tofollowMaintenanceInstructionsmaycreateariskofelectricshockorinjury.

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SPECIFICSAFETYRULES
• Accessoriesmustberatedforatleastthespeedrecommendedonthetool
warninglabel.Wheelsandotheraccessoriesrunningoverratedspeedcany
apartandcauseinjury.
• Holdtoolbyinsulatedgrippingsurfaceswhenperforminganoperationwhere
thecuttingtoolmaycontacthiddenwiringoritsowncord.Contactwitha“live”
wirewillmakeexposedmetalpartsofthetool“live”andshocktheoperator.
• Knowyourpowertool.Readoperator`smanualcarefully.Learnitsapplication
andlimitations,as wellasthespecic potentialhazardsrelatedtothistool.
Followingthisrulewillreducetheriskofelectricshock,re,orseriousinjury.
• Alwayswearsafetyglasseswithsideshields.Everydayeye-glasseshaveonly
impactresistantlenses;theyareNOTsafetyglasses.
• Protectyourlungs.Wearafaceordustmaskiftheoperationisdusty.
• Protectyourhearing.Wearhearingprotectionduringextendedperiodsof
operation.
• Inspecttoolcordsperiodicallyandifdamaged,haverepairedatyournearest
FactoryServiceCenterorotherAuthorizedServiceOrganization.Constantly
stayawareofcordlocation.
• Checkdamagedparts.Beforefurtheruseofthetool,aguardorotherpartthat
isdamagedshouldbecarefullycheckedtodeterminethatitwilloperateproperly
andperformitsintendedfunction.Checkforalignmentofmovingparts,binding
ofmovingparts,breakageofparts,mounting,andanyotherconditionsthatmay
affectitsoperation,Aguardorotherpartthatisdamagedshouldbeproperly
repairedorreplacedbyanauthorizedservicecenter.
• Donotabusecord.Nevercarrythetoolbythecordoryankittodisconnectit
fromthereceptacle.Keepcordawayfromheat,oil,andsharpedges.Following
thisrulewillreducetheriskofelectricshockorre.
• Makesureyourextensioncordisingoodcondition.Whenusinganextension
cord,besuretouseoneheavyenoughtocarrythecurrentyourproductwill
draw.Anundersizedcordwillcauseadropinlinevoltageresultinginlossof
powerandoverheating.
• Inspectforandremoveallforeignobjectsfromworkpiecebeforepolishing.
Followthisrulewillreducetheriskofseriouspersonalinjury.
• Drugs,alcohol,medication,Donotoperatetoolwhileundertheinuenceof
drugs,alcohol,oranymedication.Followthisrulewillreducetheriskofelectric
shock,re,orseriouspersonalinjury.
• Keephandsawayfrompolishingarea.Followthisrulewillreducetheriskof
cuts,scrapes,orseriouspersonalinjury.
• GroundFaultCircuitInterrupter(GFCI)protectionshouldbeprovidedonthe
circuitoroutlettobeusedforthetool.Receptaclesareavailablehavingbuilt-in
GFCIprotectionandmaybeusedforthismeasureofsafety.
• Savetheseinstruction.Refertothemfrequentlyandusethemtoinstruct
otherswhomayusethistool.Ifyouloansomeonethistool,loanthemthese
instructions.

10
USEPROPEREXTENSIONCORDS
Useonlythree-wireextensioncordsthathavethree-pronggrounding-typeplugsand
three-polereceptaclesthatacceptthetool’splug.Makesureyourextensioncord
isingoodcondition.Replaceorrepairdamagedorworncordimmediately.When
usinganextensioncord,besuretouseoneheavyenoughtocarrythecurrentyour
productwilldraw.Anundersizedcordwillcauseadropinlinevoltageresultingin
lossofpowerandoverheating.Belowtableshowsthecorrectsizetousedepend-
ingoncordlengthandnameplateampererating.Ifindoubt,usethenextheavier
gauge.Thesmallerthegaugenumber,theheavierthecord.
Ampere Rating Total length of cord in feet (120V )
25ft 50ft 100ft
More
Than Not More Than AWG
0 6 18 16 16
6 10 18 16 14
10 12 16 16 14
12 16 14 12 Not Recom-
mended
GROUNDINGINSTRUCTIONS
Thistoolshouldbegroundedwhileinusetoprotecttheoperatorfromelectricshock.
Thetoolisequippedwithathree-conductorcordandthree-pronggroundingtype
plugtotthepropergroundingtypereceptacle.Thegreen(orgreenandyellow)
conductorinthecordisthegroundingwire.Neverconnectthegreen(orgreenand
yellow)wiretoaliveterminal.
ADDITIONALPRECAUTIONSFORUSINGTHEWDP-120
Inadditiontothegeneralsafetynotesdescribedontheprecedingpages,pleaseread
andobservethefollowingprecautionarynotesbeforeusingthepolisher.
DANGER!
1. Checktheworkingvoltage.
 Besurethevoltageavailableatpoweroutletmatchesspeciedvoltageonthe
nameplate.Ifthepolisherisusedwithhighervoltagethanspecied,themo-
torwillburnout.Anyattemptstodosomaydamagethepolisherorcausean
accidentorinjury.
2. Inspectallpolishingdiscs.
 Neverusecracked,chippedordamagedpolishingdiscs.
3. Holdthepolishertightlyatstart-up.

11
 Failuretodosomaycauseaninjuryduetohighimpactatinitialstartup.
4. Stopusingthepolisherimmediatelywhennoticinganymalfunctionsorany
suspiciousabnormalnoises.
 TurnthepowerswitchOFFandcontactyourdealerorAlphaProfessionalTools®
forrepair.
5. Handlethepolisherwithcare.
 Ifyouaccidentallydropthepolisher,donotuseituntilcheckingthatitisnot
cracked,deformed,ordamagedinanyway.
6. Donotpourwateroranyliquidsontoorinsidethepolisher.
 Itmaycauseelectricshocks.
7. Donotholdthepolisherinavice.
8. Donottouchanyrotatingparts.
 Nevertouchthepolishingdiscofthepolisherduringoperationwithyourhands.
9. Donotleavethediscwhilespinningonthebench,oororsurfaceofyour
 workpiece.
 Itmaycauseanaccidentorinjury.
WARNING!
10. Attachthebackerpadandpolishingdisccorrectlybyfollowingtheprocedure
inthisinstructionmanual.
 Attachingthepolishingdiscsincorrectlymaycauseanaccident.
11. Observeanysuspiciousabnormalnoiseswhenapolishingdiscisattachedfor
thersttimeandpolisheristurnedON.
 Itmaycausebodilyinjuryifthepolishingdisciesoff.
12. Donottouchthepolishingdiscwhilespinning.
 Thepolishingdiscspinsveryfastandyoumayhurtyourself.
13. Becarefulofyoursurroundingswhenworkinginhighplaces.
 Whenworkinginhighplaces, make sure therearenopeoplebelow. Donot
trapthepowersupplycordonanythingordropthepolisheroranymaterials,
otherwise,Itmaycauseanaccident.
LAWSANDREGULATIONSOFNOISELEVELS
Pleaseobservelocallawsandregulationsregardingnoiselevelinordertoavoid
disturbingsurroundingareas.Installasoundproofwallifrequiredtocomplywith
thelocallawsandregulations.

12
GUARD INSTALLATION
Figure-4
Figure-5

13
ATTACHING RUBBER CAP TO WDP-120
ATTACHING A BACKER PAD TO WDP-120
RubberCap RubberCap
WET DRY
Figure-6
Figure-7

14
WDP-120 WET OPERATION
WDP-120 DRY OPERATION
RubberCap
Inserttherubbercaptothedustgageofthemaincover.
RubberCap
RubberHoseAdapter
StainlessSteel
HoseBand
FlexibleConnectorHose
(optional/soldseparately)
Figure-8
Figure-9

15
POLISH RIGHT UP TO THE WALL
Changethefrontcover
tothesubcover
Loosenthescrewsonbothsidesofthe
C-handleandmoveitupwardasshown
inFigure11.
STEP 1
STEP 2
STEP 3
Figure-10
Figure-11
Figure-12

16
WDP-120WET/DRYCONCRETEPOLISHEROPERATION
CAUTION!
Alwaysbesurethatthetoolisswitchedoffandunpluggedbeforeadjustingor
checkingfunctionontool.
MAINCONNECTION
Connectonlytosingle-phaseACcurrentsupplyandonlytothemainvoltagespeci-
edontheratingplate.
SWITCHINGONANDOFF
CAUTION!
Beforeplugginginthetool,alwayschecktheworkingvoltagebesurethatthevoltage
speciedisonthenameplate.Beforeplugginginthetool,alwayschecktoseethat
theslideswitchactuatesproperlyandreturnstothe“OFF”positionwhentherear
oftheslideswitchisdepressed.
 Switchingon:
 Switchcanbelockedin“ON”positionfor
easeofoperatorcomfortduringextended
use.Applycautionwhenlockingtoolin
“ON”positionandmaintainrmgraspon
tool.Pushpowerswitchtotheforward
positionuntilitlocksintopositionasshown
inFigure13.
 Switchingoff:
 Pushdownonpowerswitchtoreleaseto
therearpositionasshowninFigure14.
OFF POSITION
Figure-14
Figure-13
ON POSITION

17
GROUNDFAULTCIRCUITINTERRUPTER(GFCI)
AGroundFaultCircuitInterrupterisbuiltin-linewiththepowersupplycordto
protecttheoperatorfromelectricshock.
1. GFCIInformation.
– Alpha®WetPolisherisprovidedwithanin-lineGFCIasastandardacces-
soryforyoursafety,andtopreventpossibleelectricshocks.Itisstrongly
advisedtotesttheGFCIonaregularbasis.
DANGER!
Neverattachadamagedextensioncordtothepolisher.
 NOTE:Usetheappropriateextensioncord,seetableonpage9.
CAUTION!
WhentheGFCItrips,thiscouldbetheresultofwaterenteringthepolisherhousing.
1.TurnOFFthepowerswitch,disconnectpolisherfrompowersupplyandblow
dryairinsidethemotorcoverthroughtheairvents.
2.Re-connectpowersupplyandpresstheGFCIresetbutton.Thepolisheris
readytostartworkingoncetheresetbuttonispresseddown.
DANGER!
AlwayscheckthattheGFCIunitisworkingcorrectly(reset,test,andreset)before
usingthistool.DonotusethetooliftheGFCIisnotworkingcorrectly.Donotbypass
theGFCIifthisconditionoccurs,arealshockhazardmayexist.
WARNING!
IftheGFCIfailstotripwhenthetestbuttonispressed,orfailstoreset,thedevice
isdefectiveandshouldreplaced.
CAUTION!
1.TheGFCIisasafetydevice,donotuseasanon/offswitch.
2.TheGFCIonthetoolwillnotprotectyouifyoucutintoanothercurrent
carryingconductor.
3.DonotusewherewatermayenterGFCIcase.

18
TESTINGIN-LINEGFCIUNIT(BeforeEachUseOfThePolisher)
1.ConnectpolishertoasinglephaseACpowersupply.
2.Verifythattheindicatorlensshowsred(indicatingoutputvoltage).
3.Pressthetestbuttontoverifythattheredintheindicatorlensdisappears.
4.Presstheresetbuttontoverifytheredindicatorisvisible.
5.TheGFCIisnowreadyforuse.
WARNING!
DONOTUSEIFABOVETESTFAILS!
VARIABLESPEEDADJUSTMENT
ThispolisherisequippedwithaVariableSpeedcontrol
thatwillallowthespindlespeedtobeadjustedfrom
500RPMto2800RPM.Speedadjustmentiscontrolled
byrotationofthewheelasshownintheFigure14.
NOTE-Wheelnumbersareforreferencepointofmo-
torspeed(#1is500RPMand#6is2800RPM).
 AdjusttheRPMofthetooltomatchtherecom-
mendedRPMoftheproductbeingused.
Indicatorviewinglens.
REDlensshowspowerto
polisher.
CLEARlensshowsnopow-
ertopolisher.
RESETBUTTON
TESTBUTTON
Figure-15 Figure-16
INCREASE SPEED
DECREASESPEED
Figure-17

19
SPEEDPOTFEEDBACKSENSOR
ThispolisherisequippedwithaClosedLoopFeedbacksensorthatisattachedto
thespeedpot.Whenaloadisappliedtothetool,thesensorwillre-adjusttheRPM
tomaintainaconstantspeed.
WATERCONTROLVALVE
CAUTION!
Adjustthewaterowtowetthestoneandremovewaste,excessivesprayandmistwill
getinsidethetoolandcauseprematurefailureofthetooland/orcausetheGFCItotrip.
Thispolisherisequippedwithacenterwater-feedsystem.Waterowtothespindle
showerboltcanbecontrolled by throttling the valve stem as seen in Figure 18,
Figure19andFigure20.
WaterValvein
closedposition WaterValvein
halfopenposition
WaterValveinfullopenposition
Figure-18 Figure-19
Figure-20

20
WATER-FEEDATTACHMENT
Attachthepolisherwater-linettingtoanygardenhoseconnection.
OPERATION
WARNING!
Toreducetheriskofelectricshock,checkthetool’swatersupplysystemtoensure
thereisnodamagetothesealsorhoses.Adamagedwatersupplysystemmayresult
inabnormalwaterowtothetoolwhichcouldbedangerous.
CAUTION!
Alwayswearsafetygogglesorafaceshieldduringoperation.Neverswitchonthe
toolwhenitisincontactwiththeworkpiece,itmaycauseaninjurytooperator.Never
runthetoolwithoutproperlyinstalledaccessories.
Makesurethatthewatervalveisclosed.Connectthegardenhoseadaptertothewater
source.Makesurethatwatercomesoutwhenthewatervalveisopened.Holdthe
toolrmly.Turnthetoolonandbeginyourapplication.Applyslightpressureonly.
Excessivepressurewillresultinpoorperformanceandprematurewear.
MAINTENANCE
CAUTION!
Alwaysbesurethatthetoolisswitchedoffandunpluggedbeforeattemptingto
performinspectionormaintenance.
DAILY
1. Beforedailystart-upinspecttool,powercord,GFCI,andbackerpadorother
spindleattachments.
2. Ifdamagehasoccurred,repairaffectedareasbeforeuse.
3. ConnectthetooltothecorrectpowersourceandtesttheGroundFaultCircuit
Interrupter(GFCI)beforeusingthetool.PushtheRESETbuttonandconrm
thattheredlightison,pushtheTESTbuttonandconrmthattheredrunlight
isoffandpushtheRESETbuttontousethetool.
4. Turntheunitonandruninano-loadconditiontoensurethatbackerpadorother
spindleattachmentisbalanced.
5. Afterdailyuseofthetool,cleanandblowofftheexterioroftoolandaroundthe
rearairintakeventstoremoveanystandingwaterordust.Failuretodothis
willshortenthelifeofyourtool,andcouldvoidyourwarranty.