Central Machinery 40668 Set Up And Operating Instructions Manual

Central Machinery
Brand
Central Machinery
Model
40668
Category
Power tools
Type
Set Up And Operating Instructions Manual

Central Machinery 40668 is a powerful 3/4 HP benchtop buffer with a 3450 RPM motor, perfect for polishing and buffing a variety of materials. It features a double-ended spindle that accommodates both polishing and buffing wheels, a sturdy cast iron construction, and rubber feet to reduce vibration. The pull-on, push-off safety switch ensures easy operation, while the ball bearing construction provides smooth, reliable performance. This versatile tool is ideal for use in workshops, garages, and other industrial settings.

Central Machinery 40668 is a powerful 3/4 HP benchtop buffer with a 3450 RPM motor, perfect for polishing and buffing a variety of materials. It features a double-ended spindle that accommodates both polishing and buffing wheels, a sturdy cast iron construction, and rubber feet to reduce vibration. The pull-on, push-off safety switch ensures easy operation, while the ball bearing construction provides smooth, reliable performance. This versatile tool is ideal for use in workshops, garages, and other industrial settings.

8” Buffer
40668
SET UP AND OPERATING INSTRUCTIONS
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright© 1999 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any artwork
contained herein may be reproduced in any shape or form without the express written consent of Harbor Freight
Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing improvements, actual
product may differ slightly from the product described herein. Tools required for assembly and service may not
be included.
For technical questions or replacement parts, please call 1-800-444-3353.
(Bufng Wheels Not Included)
SPECIFICATIONS MODEL # 40668 BUFFER
Motor: 115V, 8.2 Amps, 60 HZ,
Single Phase, 3/4 HP, 3450 RPM
Extended Shaft Diameter: 3/4”
Spindle Thread: 3/4” x 12 TPI
Spindle Length: 2-5/16”
Mounting Flange: 3-3/8” diameter
Base Size: 8” x 5-3/4”
FEATURES OF THIS BUFFER
1. Double-endedspindleaccommodatesbothPolishingandBufngwheels.
2. Powerful3/4HPmotordeliverseffectivepolishingandbufngat3450rpm.
3. HeavyCastIronconstructionprovidesasturdybaseforpolishingworkpieces.
4. Rubberfeetreducevibration.
5. Ballbearingconstructionprovidessmooth,reliableperformance.
6. Pull-onPush-offsafetyswitchiseasytousewhilehandlingworkpieces.
7. Nomaintenancerequired,otherthanperiodicreplacementofwheels.
SAVE THIS MANUAL
Youwillneedthismanualforthesafetywarningsandcautions,assemblyinstructions,operating
procedures,maintenanceprocedures,troubleshooting,partslist,anddiagram.Keepyourinvoice
withthismanual.Writetheinvoicenumberontheinsideofthefrontcover.Keepboththismanual
andyourinvoiceinasafe,dryplaceforfuturereference.
Page 2 SKU # 40668
NOTICE
The Warnings, Cautions, and Instructions discussed in this instruction manual cannot
cover all possible conditions and situations that may occur. It must be understood by
the operator that common sense and caution are factors which cannot be built into this
product, but must be supplied by the operator.
Rev03/02
SAFETY WARNING & CAUTIONS
READ ALL INSTRUCTIONS BEFORE USING THIS TOOL!
1.KEEPWORKAREACLEAN.Clutteredareasinviteinjuries.
2.OBSERVEWORKAREACONDITIONS.Donotusetoolsindamp,wet,orpoorlylitlocations.
Don’texposetorain.Keepworkareawelllit.Donotuseelectricallypoweredequipmentinthe
presenceofammablegasesorliquids.
3.KEEPCHILDRENAWAY.Childrenmustneverbeallowedintheworkarea.Donotletthem
handle machines, tools, or equipment.
4.STOREIDLEEQUIPMENT.Whennotinuse,toolsmustbelockedupinadrylocationtoinhibit
rust.Alwayslockuptoolsandkeepoutofreachofchildren.
5.DONOTFORCETHETOOL.Itwilldothejobbetterandmoresafelyattherateforwhichitwas
intended. Do not use inappropriate attachments in an attempt to exceed the tool’s capacities.
6.USETHERIGHTTOOLFORTHEJOB.Donotuseatoolforapurposeforwhichitwasnot
intended.
7. DRESSPROPERLYDonotwearlooseclothingorjewelry,astheycanbecaughtinmovingparts.
Non-skidfootwearisrecommended.Wearrestrictivehaircoveringtocontainlonghair.Alwayswear
appropriateworkclothing.
8. USE EYE, EAR AND BREATHING PROTECTION.AlwayswearANSIapprovedimpactsafety
gogglesifyouareproducingmetallingsorwoodchips.WearanANSIapproveddustmaskor
respiratorwhenworkingaroundmetal,wood,andchemicaldustsandmists.UseANSIapprovedear
protectionwhenworkinginaloudornoisyenvironment.
9.DONOTABUSETHEPOWERCORD.Protectthepowercordfromdamage,eitherfrom
impacts,pullingorcorrosivematerials.Donotyankmachine’scordtodisconnectitfromthe
receptacle.
10.DONOTOVERREACH.Keepproperfootingandbalanceatalltimes.Donotreachoveror
across running machines.
11.MAINTAINTOOLSWITHCARE.Keeptoolssharpandcleanforbetterandsaferperformance.
Followinstructionsforlubricatingandchangingaccessories.Inspectpowercordperiodicallyand,
ifdamaged,haveitrepairedbyanauthorizedtechnician.Inspectallhydraulicsealsforleaksprior
touse.Controlhandleandpowerswitchmustbekeptclean,dry,andfreefromoilandgreaseatall
times.
Page 3 SKU # 40668
WARNING: When using shop equipment, basic safety precautions should
always be followed to reduce the risk of personal injury and hazards.
12.REMOVEADJUSTINGKEYSANDWRENCHES.Besurethatkeysandadjustingwrenches
areremovedfromthetoolormachineworksurfacebeforeoperation.
13.AVOIDUNINTENTIONALSTARTING.Besurethatyouarepreparedtobeginworkbefore
turningthestartswitchon.
14.STAYALERT.Watchwhatyouaredoing.Donotoperatethismachinewhenyouaretired.
15. DONOTOPERATETHISMACHINEWHILEUNDERTHEINFLUENCEOFALCOHOL,
DRUGS,ORPRESCRIPTIONMEDICINES.
16.CHECKFORDAMAGEDPARTS.Beforeusinganytool,anypartthatappearsdamagedshould
becarefullycheckedtodeterminethatitwilloperateproperlyandperformitsintendedfunction.
Checkforalignmentandbindingofmovingparts,anybrokenpartsormountingxtures,andany
otherconditionthatmayaffectproperoperation.Anypartthatisdamagedshouldbeproperly
repairedorreplacedbyaqualiedtechnician.Donotusethetoolifanyswitchdoesnotturnonand
offproperly.
17.REPLACEMENTPARTSANDACCESSORIES.Whenservicing,useonlyidentical
replacementparts.Useofanyotherpartswillvoidthewarranty.Onlyusepartsandaccessories
intendedforusewiththistool.ReplacementpartsareavailablefromHarborFreightTools.
SPECIAL WARNINGS WHEN USING THIS BUFFER
Using this Buffer may create special hazards.
Take particular care to safeguard yourself and those around you.
Electrical Safety. Never operate any tool if there is an electrical hazard.Neveroperatean
electricaltoolinwetconditions.Neveroperateatoolwithanimproperelectricalcordorextension
cord.Neveroperateanelectricaltoolunlessyouarepluggedintoaproperlygroundedoutlet,which
supplies110-120Volts.Werecommendthatyouuseacircuitwhichisprotectedbya30Amp
circuitbreaker.
Ejected Material. Use safe practices to avoid injury from ejected material.BecausetheBufng
andPolishingwheelsturnathighspeed,thereisadangerofbeinginjuredbymaterialsthatmay
beejectedfromthewheelsathighspeed.AlwayswearANSI-certiedeyeprotection.Neverinsert
anyitemintothewheelsifitisnotadequatelyheld.Alwaysstandtoonesideoftheplaneinwhich
thewheelsarespinning,toavoidbeinghitifanitemisejected.Neverallowbystanderstobeinthe
proximityoftheBufferwhileinoperation.
Entanglement. Use extreme caution to prevent loose materials from being caught in the wheels.
Neveroperatethisbufferwithlooseclothing,longhair,jewelry,orotheritemswhichmaybecome
caughtinthespinningwheels.Incaseofentanglement,presstheOFFswitchimmediately.
NOTICE: No list of warnings can be all inclusive. The operator must supply common
sense, and operate this tool in a safe manner.
Page 4 SKU # 40668
Page 5 SKU # 40668
ASSEMBLY AND OPERATION
To prepare for use, you must mount the Buffer securely on a bench top,
 installbufngwheels,androutethepowersupply.
Mounting the Buffer
1. Placethebufferonthebenchtopwhereyouplantouseit.Thebenchmustbesturdy,and
 preferablyabletoresistvibrations.
2. Besurethe4rubberfeetareonalevelsurface,andthatall4feetarermlycontactingthe
 benchtop.Ifnot,selectanothersightwhichislevel.
3. Youmayusethisbufferwithoutpermanentlymountingit.However,permanentlymountingit
 makesamoresecureinstallation.
4. Topermanentlyinstall,positionthebufferwhereyouwantit;thenmarkthebenchtop
through the holes on the left and right sides of the base. Set the buffer aside, and drill holes
 throughthebenchtopateachmark.Replacethebuffer,andinsertsuitableboltsthroughthe
 bufferbase,andthroughthebenchtop.Secureunderneathusingwashersandnuts.
 Tightenrmly.
InstalltheBufngWheels.
Note: Generally buffers are set up with one wheel for “Rouge”, an abrasive polishing
compound, and one wheel for “Polish” a non-abrasive compound. Since Rouge can
contaminate the Polishing wheel, never allow the abrasive compound to come in contact
with the Polishing wheel.
1. WhenfacingtheBuffer,thespindlenutontherightsideusesarighthandthread.TheNuton
the left side uses a left hand thread. Do not mix these up.
2. RemovetheSpindlenut.ThenremovetheOuterFlange.
3. SlidetheBufngWheel(NotIncluded)ontotheSpindle.
4. ReplacetheOuterFlange.ReplacetheNut,andtightenrmly.
5. Repeat this process for the other side.
 NOTE:YoumaypurchasesuitableBufngWheelsandpolishingcompoundfrom
Harbor Freight Tools.
Route the Electrical Cord.
 WARNING:Onlyplugthepowercordintoagrounded(3-prong)outletwhichdelivers
110-120Volts.Werecommendthatyouuseacircuitwhichisprotectedbya30-amp 
breaker switch.
1. Chooseasuitableoutlet.
2. Determinearouteforthepowercordwhichwillkeepitawayfromothertools,moisture,
 dangerofbeingcutordamagedbyotherequipment,andawayfrompathways.
3. MakesurethePowerSwitchonthefrontoftheBufferisOFF(pushedin)beforepluggingin
 thePowerCord.
Safe Operation
1. NeverpullthePowerSwitchoutintotheONpositionuntilyouarepreparedtodoso.
2. AlwayswearANSI-approvedeyeprotectionwhenusingthisbuffer.
3. Holdtheworkpieceagainstthebufngwheelslightlybelowthehorizontalmid-pointofthe
 wheel,andataslightdownwardangle.Thiswillreducethelikelihoodofthepiecebeing
 ejectedoutward,shoulditslipfromyourhandsortheholder.
MAINTENANCE
This tool requires very little maintenance. However, to keep it in best condition:
1. CleanyourBufferperiodically.
2. Keeptheventilationholesfreeofdebris.
3. Whennotinuse,keepyourBuffercoveredtopreventmoisturedamage,andcontamination.
Page 6 SKU # 40668
GROUNDING / VOLTAGE WARNING
Commonhouseholdcurrentis110-120volts.Aslongastheoutletusedwiththistoolisratedfrom
110-120Vtherewillbenocomplicationsusingitwithhouseholdreceptacles.Plugthetoolintoa
110-120Vproperlygroundedoutlet.Werecommendthatyouuseacircuitwhichisprotectedbya
15-ampere,dualelementtimedelayorcircuitbreaker.
NEVERtrytopluga110-120Vtoolintoa220-240Vcircuitorseriouscomplicationsandpossible
injurytotheoperatormayoccur.Theplugshavedifferentshapestopreventthis.
Thistoolhasathree-prongplug.Thethird(round)prongistheground.Cuttingoffthegroundwill
resultinasafetyhazardandvoidthewarranty.
Iftheoutletyouareplanningtouseisthetwo-prongtype,donotremoveoralterthegrounding
pronginanymanner.Useanadapterandalwaysconnectthegroundinglugtoaknowngrounding
source.Itisrecommendedthatyouhaveaqualiedelectricianreplacethetwo-prongoutletwitha
properlygroundedthree-prongoutlet.
EXTENSION CORDS
Yourtoolhasathree-prongplug,thereforeyoumustuseathree-prongextensioncord.Onlyuse
roundedjacketextensioncordslistedbytheUnderwritersLaboratories(UL).Improperuseof
extensioncordsmaycauseinefcientoperationofyourtoolwhichcanresultinoverheating.Be
sureyourextensioncordisratedtoallowsufcientcurrentowtothemotor.
Ifyouareusingthetooloutdoors,useanextensioncordratedforoutdooruse(signiedby“WA”on
thejacket).
Theextensioncordmusthaveaminimumwiresizedependingontheamperageofthetoolandthe
lengthoftheextensioncord.ThissizeisdeterminedbyitsAWG(AmericanWireGauge)rating.The
smallerthegauge,thegreaterthecable’scapacity.Theamountofcordsuseddoesnotmatter:Total
lengthdeterminestheminimumAWGrating.EverycordmustmeettheAWGrating.Usethechart
belowtodeterminewhatAWGratingisrequiredforyoursituation.Cordlengthisratedinfeet.Harbor
Freight Tools can supply UL listed and outdoor rated cords in multiple AWG ratings if needed.
AWG RATING CHART
CORD LENGTH 25’ 50’ 75’ 100’ 125’ 150’ 175’ 200’
AMPS AWG AWG AWG AWG AWG AWG AWG AWG
0-10.0 18 18 16 16 14 14 12 12
10.1-13.0 16 16 14 14 14 12 12 12
13.1-15 14 14 12 12 12 12 12 —-
Do not modify your plug in any way. If you have any doubt, call a qualied electrician.
MODEL #40668 BUFFER
Page 7 SKU # 40668
MODEL #40668 BUFFER PARTS LIST
Part # Description
1  Screw  
2  EndBell(left)
3 Bearing
4 Stator
5 Motor Housing
6 Rotor
12  EndBell(right)
13 Terminals
14  PowerCord
15 Strain Relief
Part # Description
16  Screw
17 Plate
18 Base
19  PulOnSwitch
20  Screw
21 Base
22 Rubber Pad
23  Screw
24  Capacitor
25  CapacitorCover
PLEASEREADTHEFOLLOWINGCAREFULLY
THEMANUFACTURERAND/ORDISTRIBUTORHASPROVIDEDTHEPARTSDIAGRAMINTHISMANUALASAREFER-
ENCETOOLONLY:NETHERTHEMANUFACTURERNORDISTRIBUTORMAKESANYREPRESENTATIONORWAR-
RANTYOFANYKINDTOTHEBUYERTHATHEORSHEISQUALIFIEDTOMAKEANYREPAIRSTOTHEPRODUCTOR
THATHEORSHEISQUALIFIEDTOREPLACEANYPARTSOFTHEPRODUCT:INFACTTHEMANUFACTURERAND/
ORDISTRIBUTOREXPRESSLYSTATESTHATALLREPAIRSANDPARTSREPLACEMENTSSHOULDBEUNDERTAKEN
BYCERTIFIEDANDLICENSEDTECHNICIANSANDNOTBYTHEBUYER.THEBUYERASSUMESALLRISKANDLI-
ABILITYARISINGOUTOFHISORHERREPAIRSTOTHEORIGINALPRODUCTORREPLACEMENTPARTSTHERETO,
ORARISINGOUTOFHISORHERINSTALLATIONOFREPLACEMENTPARTSTHERETO.
REV 08e
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Central Machinery 40668 Set Up And Operating Instructions Manual

Central Machinery
Brand
Central Machinery
Model
40668
Category
Power tools
Type
Set Up And Operating Instructions Manual

Central Machinery 40668 is a powerful 3/4 HP benchtop buffer with a 3450 RPM motor, perfect for polishing and buffing a variety of materials. It features a double-ended spindle that accommodates both polishing and buffing wheels, a sturdy cast iron construction, and rubber feet to reduce vibration. The pull-on, push-off safety switch ensures easy operation, while the ball bearing construction provides smooth, reliable performance. This versatile tool is ideal for use in workshops, garages, and other industrial settings.

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