Benchmark 1282-721 User manual

5 Year Limited Warranty
READALLINSTRUCTIONSBEFOREFIRSTUSE.KEEPTHISMANUALFORFUTUREREFERENCE.KEEPAWAYFROMCHILDREN.
WEAREARPROTECTION
WEARAFACEMASK
WEARCSAAPPROVEDEYEPROTECTION

1
PRODUCTSPECIFICATIONS
1/2"DRIVEPNEUMATICIMPACTWRENCH
Drive
1/2"(13MM)
MaxDrivespeed
7,500RPM
MaximumTorque
740ft.Lbs.
MaxPSI
120PSI
AverageAirConsumption
3.7CFM@90PSI
Workingpressure
90PSI
Airinlet
1/4”NPT
RecommendedHose
3/8”
Weight
4.6lb(2.1kg)
•Pleasenote(wherethe¼”NPTconnecterisnotalreadyinstalledonthetool)yourtoolmaybeshippedwithablackplasticcapinstalledintheairinlet.Prythecapoutpriortoinstallingthe¼”NPTconnector.NEEDASSISTANCE?Callusonourtoll-freecustomersupportline:1-866-349-8665(MondaythroughFriday9am–5pmEasternStandardTime)TechnicalquestionsReplacementpartsPartsmissingfrompackage
NOTE these instructions pertain to the tool only. Please refer to
your compressors operator’s manual and follow the manufactures
instructions.

1282-721
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TABLEOFCONTENTSProductSpecifications.............................................................................................. 1TableofContents....................................................................................................... 2SafetyGuidelines....................................................................................................3-5Symbols...................................................................................................................... 6ToolSpecificWarnings.............................................................................................. 7Knowyour1/2"DrivepneumaticimpactWrench.................................................. 8AssemblyandOperating..................................................................................... 9-13Maintenance...................................................................................................... 14-16ExplodedView.......................................................................................................... 17PartsList............................................................................................................ 18-19Warranty................................................................................................................... 20

3
SAFETYGUIDELINESWARNING:ThismanualcontainsinformationthatrelatestoPROTECTINGPERSONALSAFETYandPREVENTINGEQUIPMENTPROBLEMS.Itisveryimportanttoreadthismanualcarefullyandunderstanditthoroughlybeforeusingtheproduct.Thesymbolslistedbelowareusedtoindicatethisinformation.DANGER!Potentialhazardthatwillresultinseriousinjuryorlossoflife.WARNING!Potentialhazardthatcouldresultinseriousinjuryorlossoflife.CAUTION!Potentialhazardthatmayresultinmoderateinjuryordamagetoequipment.Note-Theword"Note"isusedtoinformthereaderofsomethinghe/sheneedstoknowaboutthetool.PERSONALSAFETYTheseprecautionsareintendedforthepersonalsafetyoftheuserandothersworkingwiththeuser.Pleasetaketimetoreadandunderstandthem.

1282-721
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Donotuseoxygenoranyothercombustibleorbottledgastopowerair-poweredtools.Failuretoobservethiswarningcancauseexplosionandseriouspersonalinjuryordeath.Useonlythecompressedairtopowertheair-poweredtools.Useaminimumof25’(7.6m)ofhosetoconnectthetooltothecompressor.Failuretocomplywillresultinseriousinjuryorlossoflife.
Riskofelectricshock:Donotexposeacompressortorain.Storeitindoors.Disconnectthecompressorfrompowersourcebeforeservicing.Compressormustbegrounded.Donotusegroundingadaptors.
Riskofpersonalinjury:Donotdirectcompressedairfromtheairhosetowardstheuserorotherpersonnel.
Riskforinhalation:Neverdirectlyinhaletheairproducedbythecompressor.
Riskofbursting:Donotadjustthepressureswitchorsafetyvalveforanyreason.Theyhavebeenpresetatthefactoryforthiscompressor’smaximumpressureTamperingwiththepressureswitchorthesafetyvalvemaycausepersonalinjuryorpropertydamage.
Riskofburns.Thepumpandthemanifoldgeneratehightemperatures.Inordertoavoidburnsorotherinjuries,donottouchthepump,themanifold,orthetransfertubewhilethecompressorisrunning.Allowthepartstocooldownbeforehandlingorservicing.Keepchildrenawayfromthecompressoratalltimes.
Riskofbursting:Makesuretheregulatorisadjustedsothatthecompressoroutletpressureissetlowerthanthemaximumoperatingpressureofthetool.Beforestartingthecompressor,pulltheringonthesafetyvalvetomakesurethevalvemovesfreely.Drainwaterfromtankaftereachuse.Donotweldorrepairtank.Relieveallpressureinthehosebeforeremovingorattachingaccessories.
Oxygen
nydrogen
Combustible
explosive
SYMBOLMEANING

5
DANGER!Keepchildrenawayfromtheworkarea.Donotallowchildrentohandlepowertools.Donotusethistoolinthepresenceofflammableliquidsorgases.Sparksthatarecreatedduringusemayignitegases.Keepairhoseawayfromheat,oil,andsharpedges.Checkairhoseforwearbeforeeachuseandensurethatallconnectionsareproper.Alwaysensurethattheworkpieceisfirmlysecuredleavingbothhandsfreetocontrolthetool.Alwaysensurethatthetoolhasstoppedbeforeputtingitdownafteruse,forsafetypurposesandtopreventpossibledamagetothetool/user.Keepproperfootingatalltimesinordertoensurecorrectbalance.WARNING!DonotallowunskilledoruntrainedindividualstooperatetheGravityFeedSprayGun.Locatethecompressorinawell-ventilatedareaforcooling,andaminimumof12”(31cm)awayfromthenearestwall.Protecttheairhoseandthepowercordfromdamageandpuncture.Inspectthemforweakorwornspotseveryweekandreplacethemifnecessary.Alwayswearhearingprotectionwhenusingtheaircompressor.Failuretodosomayresultinhearingloss.Donotcarrythecompressorwhileitisrunning.Donotoperatethecompressorifitisnotinastableposition.Donotoperatethecompressoronarooftoporanelevatedpositionthatcouldallowtheunittofallorbetippedover.*Alwaysreplaceadamagedgaugebeforeoperatingtheunitagain.*Donotconnectthetooltoasourceofcompressedairwithanoutletpressuregreaterthan120PSI.CAUTION!AlwaysensurethatthetoolhasstoppedbeforedisconnectingtheairsupplyDonotwearwatches,rings,bracelets,orlooseclothingwhenusinganyair-poweredtool
Donotoverloadthetool.Allowthetooltooperateatitsoptimumspeedformaximumefficiency.
Donotuseatoolthatisleakingair,thathasmissingordamagedparts,orthatrequiresrepairs.VerifythatallscrewsaresecurelytightenedForoptimalsafetyandtoolperformance,inspectthetoolbeforeeveryusage,inordertoensurefreemovementofthetrigger,safetymechanisms,andsprings.Alwayskeepyourairtoolcleanandlubricated.Dailylubricationisessentialtoavoidinternalcorrosionandpossiblefailures.Ensurethefloorisnotslipperyandwearnon-slipshoes.Floorsshouldbekeptcleanandclear.Alwaysfollowallworkshopsafetyrules,regulations,andconditionswhenusingthetoolandkeeptheworkareaclean.Carrythetoolbythehandleonly,keepingfingersawayfromthetrigger.Donotcarrythetoolbythehose,magazine,oranyotherparts.Donotusethetoolnearorbelowfreezingpoint,asdoingsomaycausetoolfailure.Donotstorethetoolinafreezingenvironmenttopreventiceformationonthetoolsoperatingvalves,asdoingsomaycausetoolfailure.Handlingandstorageofoil:Usewithadequateventilation.Avoidcontactofoilwitheyes,skin,andclothing.Avoidbreathingsprayormist.Storeinatightlyclosedcontainerinacool,dry,well-ventilatedareafreefromIncompatiblesubstances.Trippinghazard.Theairhosemaybecomeatrippinghazardwhenitisplacedintheworkarea.Usecarewhenwalkingintheworkarea.

1282-721
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CAUTION!
Disconnecttoolfromtheairsupplyandturnoffthecompressor
beforeperforminganymaintenanceorchangingaccessories,whenclearingajammedfastener,whenthetoolisnotinuse,whenitisbeinghandedtoanotherperson,andwhenitisleftunattended.Failuretocomplymayresultinmoderateinjuryordamagetoequipment.
Usesafetygogglesandearprotection :Wearsafetyglasseswithsideshieldswhenoperatingthetool/compressorandverifythatothersintheworkareaarealsowearingsafetyglasses.SafetyglassesmustconformtoAmericanNationalStandardsInstitute(ANSIZ87.1)requirementsandmustprovideprotectionfromflyingparticlesfromthefrontandthesides.
Air-poweredtoolsareloud,andthesoundcancausehearingdamage.Alwayswearearprotectiontopreventhearingdamageandloss.Failuretocomplymayresultinmoderateinjury.
Note:Recycle unwanted materials rather than disposing of them as waste. Sort the tools,
hoses, and packaging in specific categories and take to the local recycling center or
dispose of in an environmentally safe way.
SYMBOLS
WARNING: Someofthefollowingsymbolsmayappearonthetool.Studythesesymbolsandlearntheirmeaning.ProperinterpretationofthesesymbolswillallowformoreefficientandsaferoperationThistool.
SYMBOLS
Read operator s manual: To reduce the risk of injury,
user must read and understand operator s manual
before using this product.
Risk to hearing :
using this tool.
In hearing loss.
Always wear ear protection when
Failure t o d o s o m a y r e s u l t
Eye protection: Always wear safety goggles, safety
glasses with side shields, or a full-face shield when
operating this product.

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TOOLSPECIFICWARNINGS
• Avoiddirectcontactwithaccessoryandworksurfaceduringandafterworkastheybecomeheatedandsharp.Wearsafetyglovestoprotecthands.
• Operatorsmustbephysicallyabletohandlethebulk,weight,andpoweroftool.Donotforcethetool.
• Repetitiveworkmotionsandexposuretovibrationcanbeharmfultohandsandarms.Ifnumbness,tingling,painorwhiteningoftheskinoccurs,stopusingthetool.
• Stayclearofthehammerwhileinoperation.Flyingobjectscancausesevereinjury.
• Avoid“free-running”.Thisoccurswhenthetoolisnotinpropercontactwiththework,eitherslidingofforbreakingthroughthinconcreteorrock.
• Selectthecorrectshankandretainerforthetoolbeingused.
• Neverusedullaccessoriesastheyrequireexcessiveworkpressureandcanbreak.
• Maintainabalancedbodypositionandsecurefootingatalltimes.
• Beawareofhiddenhazardsthatmayexistwhereyouareworking,suchaselectricwiresetc.
• Thistoolisnotintendedforuseinanexplosiveatmosphere.
Alwaysensurethataccessoriessuchasimpactsockets are
speciallydesignedforusewiththe1/2"drivepneumaticimpact
wrench.
• Alsoensuretheyaresecuredandcorrectlyfastened beforeconnectingthetooltotheairsupply.
• Donotusethe1/2"drivepneumaticimpactwrenchforanytask
otherthanthatitisdesignedtoperform.
• Donotusethe1/2"drivepneumaticimpactwrenchunlessyou
havebeeninstructedhowtodoso.

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1/2"PNEUMATICIMPACTWRENCH
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KNOWYOUR1/2"DRIVEPNEUMATICIMPACTWRENCH
No.
Description
No.
Description
1
1/2"Squaredrivehead
4
Trigger
2
Airinletplug
5
Forward/reverseSwitch
3
Airdeflector

9
ASSEMBLYANDOPERATINGThe1/2"pneumaticimpactwrenchhasacompositebodytoreducestrain.Thewrenchdeliversupto740ft.lbs.oftorquetogettoughfasteningjobsdonefast.Thisimpactwrenchisdesignedforremovingandinstallingbolts,e.g.,automotivelugnutsontires,andforgeneralassemblywork.COMPATIBLECOMPRESSORSGUIDELINESFORPROPERUSEANDOPERATIONBesuretouseaproperaircompressorwithair-poweredtools.Thecompressorshouldbeabletosupplyaminimalairdeliveryof3.7CFM@90PSItoensurethecompressorcanruncontinuouslywiththetool.
AirCompressorSizeandPower
2HP
21/2HP
3+HP
5-6Gallons
Light-dutyandIntermittentuse
Light-dutyandIntermittentuse
Medium-dutyandIntermittentuse
8-11Gallons
Light-dutyandIntermittentuse
Medium-dutyandIntermittentuse
Heavy-dutyandIntermittentuse
15+Gallons
Medium-dutyandIntermittentuse
Heavy-dutyandContinuoususe
Heavy-dutyandContinuoususe

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1/2"PNEUMATICIMPACTWRENCH
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AIRSYSTEMAlwaysuseclean,dry,regulated,compressedairat5.2to6.2bar(75to90PSI)Donotexceedthemaximumorminimumpressures.Operatingthetoolatthewrongpressure(Toolowortoohigh)willcauseexcessivenoiseorrapidwearoftool.
No.
Description
No.
Description
1
1/2"DrivePneumaticImpactWrench
6
Regulator0-90PSI(0-6.2bar)
2
Quickconnector
7
Filter
3
Quickcoupler
8
Cut-offvalve
4
Airhose
9
Aircompressor
5
Lubricator

11
WARNING Keephandsandotherpartsofthebodyawayfromtheworkareaswhenconnectingthetooltotheairsupply.Failuretocomplycouldleadtoseriousinjuryorlossoflife.Itisrecommendedthatafilter-regulator-lubricatorisusedandlocatedasclosetothetoolaspossible.Ifafilter-regulator-lubricatorisnotinstalled,placeupto6dropsofcompressoroilintotheNPTinletplugbeforeeachuse.Ifafilter-regulator-lubricatorisinstalled,keeptheairfilterclean.Adirtyfilterwillreducetheairpressuretothetool,whichwillcausereductioninpower,efficiency,andgeneralperformance.Foroptimalperformance,installaquickconnectortothetoolandaquickcoupleronthose,ifapplicable.Verifythatalloftheconnectionsintheairsupplysystemaresealedinordertopreventairfromleaking.Failuretocomplymayresultinmoderateinjuryordamagetoequipment.
Airtools
Readthisinstructionmanualthoroughlybeforeusingthetool.
Readallsafetyguidelines(seesection"safetyguidelines”)atthebeginningofthismanual.Alwaysinspecttheairtoolpriortoeachuseto
- ensureproperuseofpowersource.
- determinewhetherthetoolisinproperworkingorder.Onlyuseaccessorieswhicharespeciallydesignedforusewiththistool.Drainthecompressortankdaily.Waterintheairsupplylinewilldamagethetool.Cleantheairinletandthefilterweekly.Linepressureshouldbeincreasedtocompensateforunusuallylongairhoses.Thehosediametershouldbe3/8”.Donotusethetoolifitisnotinproperworkingorder.Donotuseoxygenoranyothercombustibleorbottledgastopowerthistool.Donotusethistoolinthepresenceofanyflammableliquidsorgases.Keephoseawayfromheat,oil,andsharpedges.Checkhoseforwearandtear,ensurethatallconnectionsaresecure.Failuretocomplycouldleadtoseriousinjuryorlossoflife.

1282-721
1/2"PNEUMATICIMPACTWRENCH
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OperationWARNING!
Potentialhazardthatcouldresultinseriousinjuryorlossoflife.
•
UseonlythesocketsspecificallydesignedforthispneumaticImpactWrench.Failuretocomplytocomplymayresultinmoderateinjuryordamagetothetool.
1. VerifythattheairsupplyiscleanbeforeoperatingthepneumaticImpactWrench.2. Plugincompressor,turnitonandsetthepressureregulatorto90PSI,attachoneendoftheairhosetothecompressorandtheotherendoftheairhose(1)tothepneumaticImpactWrench(2)Useplumber’stapetopreventairleak.3. Placeandlockthesocket(1)overthesquaredrive(2)ofthepneumaticImpactWrench.4. Pressthetrigger(1)ofthetoolforrotatingoperation.5. Adjusttheregulatorknob(1)attherearendofthetooltocontrolthespeedoftheairflowandtoadjustthedirectionofrotation(Forwardandreverse).

13
After using the tool, disconnect the
air hose (1) from the tool (2)
Note : When repair the tool, use hex key
to remove the screws if necessary.
Storage
If it is necessary to store the tool for an extended period of time, apply a generous amount of
lubrication before storing.
The tool should be allowed to run for approximately 30 seconds after lubricating, in order to
ensure that the lubrication is uniformly distributed throughout the tool.

1282-721
1/2"PNEUMATICIMPACTWRENCH
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Maintenance
NOTE:Do not store the tool anywhere temperatures will fall below freezing.
DANGER!
Disconnect the tool from the air compressor before maintenance/service,
adjusting and when it is not in use.
Repairs must be performed by a qualified service technician only.
Failure to comply will lead to serious injury or loss of life.
MAINTENANCEREQUIRED
DESCRIPTION
TOOLSORMATERIALSREQUIRED
MAXIMUMSERVICEINTERVAL
Eachuseor
every2hrs.
Monthly
Asneeded
Generalinspection-freemovement
Trigger,spring,
None
X
In-depthinspection
Wornorbrokenparts
X
X
Replacewornorbrokenparts
X
Lubrication
Seebelow
Pneumatic
tooloil
X
Lubrication: If the tool and the
equipped with an in-line lubrication system, place
up to 6 drops of pneumatic tool oil into the air inlet
before each use or after every 2 hours of
continuous use, depending on the characteristics
of the workpiece.
Air-operated tools must be inspected periodically, and worn or broken parts must be replaced
in order to keep tools operating safely and efficiently.
Inspect and replace worn or damaged 0-rings, seals, etc. Tighten all screws and caps
frequently in order to help prevent personal injury.
Loss of power or erratic action may be due to the following
- Excessive drain in the air line.
- Moisture or restriction in the air pipe.
- Incorrect size or type of hose connector. Check the air supply and follow instructions.
- Grit or gum deposits in the Die Grinder may also reduce performance.

15
•Inspectthetrigger,thespring,andthesafetymechanismforfreemovementonaregularbasisinordertoensurethatthesafetysystemisfullyfunctional.•Veritythatnopartislooseormissingandthatnopartisstuckorjammed.
•
Disconnectthetoolfromtheairsupply,clean,andstoreitinasafe,dry,andchildprooflocation,whentoolisnotinuse.
•Whentemperaturesarebelowfreezing,keeptoolsaswarmaspossibleusinganysafe,convenientmethod.•Checktheairsupplyforcorrectsizeandtypeofhoseconnectors.Toavoidlossofpowerorerraticaction,ensurethatthereisnoadditionaldrainontheairlineandnomoistureorrestrictionintheairpipe.TroubleshootingDANGER!If any of the following symptoms appear while the tool is in use,
turn it off and disconnect it from the air supply immediately.
Failure to comply will lead to serious injury or loss of life.
Disconnect the tool from the air supply before making any adjustments.
Repairs must be performed by a qualified service technician only.
The following chart lists common issues and solutions. Please read it
carefully and follow all instructions carefully.
Problem
Possiblecauses
Solutions
Toolrunsatnormalspeedbutlosespowerunderload.
1. Motorpartsarewornordamaged.
2.
Camclutchiswornorstuckduetolackoflubricant.
1. Lubricateclutchhousing.
2. Checkforexcessclutchoil.Clutchcasesshouldbehalf
filled,asoverfillingcancausedragonhigh-speedclutchparts.Atypicaloiled/lubricatedwrenchrequires1/2ounceofoil.Greaselubrication:Heatisgenerateddueto
insufficientgreaseinthechamber.
Severeoperatingconditionsmayrequirefrequentlubrication.

1282-721
1/2"PNEUMATICIMPACTWRENCH
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Problem
Possiblecauses
Solutions
Toolrunsatlowspeed.Airflowsslightlyfromexhaust.
1. Dirtparticlesarejammedinmotor.
2. Powerregulatorisinclosedposition.
3. Airflowisblockedbydirt.
1.
Checkifthereisblockageintheairinletandthefilter.
2. Pourpneumatictooloilintotheairinletasperinstructions.
3.
Operatethetoolbyreversingtherotationinback-and-forthdirectioninshortduration.Repeattheabovestepsasneeded.
Toolstopsworking.Airflowsfreelyfromexhaust.
Oneormoremotorvanesgotstuckduetomaterialbuildup.
1. Pourpneumatictooloilintotheairinlet.
2.
Operatethetoolbyreversingtherotationinback-and-forthdirectionsinshortduration(whereverapplicable).
3.
Tapmotorhousinggentlywithplasticmallet.
4.
Disconnecttheairsupplyandoperatethemotorbymanuallyrotatingthedriveshank(whereverapplicable).
Tooldoes
notshutoff.
ThrottlevalveO-ringsaredislodgedfrominletvalve.
ReplaceO-rings.

17
1282-721
1/2"PNEUMATICIMPACTWRENCH
EXPLODEDVIEW

1282-721
1/2"PNEUMATICIMPACTWRENCH
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PARTSLIST
WARNINGWhenservicing,useonlyoriginalequipmentreplacementparts.Theuseofanyotherpartsmaycreateasafetyhazardorcausedamagetothetool.Anyattempttorepairorreplaceelectricalpartsonthistoolmaycreateasafetyhazardunlessrepairsareperformedbyaqualifiedtechnician.Formoreinformation,
calltheToll-freeHelpline,at1-866-349-8665.
AlwaysorderbyPARTNUMBER,notbykeynumber.
Key#
Part#
PartName
Qty
1
1282-721-001
Frontsleeve
1
2
1282-721-002
Frontsealwasher
1
3
1282-721-003
Bushing
1
4
1282-721-004
AnvilCollar
1
5
1282-721-005
O-ring7.5X1.8
1
6
1282-721-006
Transmissionshaft
1
7
1282-721-007
Hammerhouse
1
8
1282-721-008
Hammerpin
2
9
1282-721-009
Hammerblock
2
10
1282-721-010
Bearing16002ZZ
1
11
1282-721-011
Frontcover
1
12
1282-721-012
Rotor
1
13
1282-721-013
Blade
6
14
1282-721-014
Pin4*46
1
15
1282-721-015
Cylinder
6
16
1282-721-016
Backcover
1
17
1282-721-017
Bearing60012ZZ
1
18
1282-721-018
RetainingRing
1
19
1282-721-019
GunBody
1
20
1282-721-020
Backsealwasher
1
21
1282-721-021
O-ring52.7X1.8
1
22
1282-721-022
Rotarycontroller
1
23
1282-721-023
O-ring34X2.4
1
24
1282-721-024
Closurecover
1
25
1282-721-025
Spring
1
26
1282-721-026
SteelBallSpring
1
27
1282-721-027
HexScrewM5X88.5
4
28
1282-721-028
Pin2.5X23
1
29
1282-721-029
O-ring3X1
2
30
1282-721-030
Trigger
1

19
1282-721
1/2"PNEUMATICIMPACTWRENCH
Key#
Part#
PartName
Qty
31
1282-721-021
Pin2.5X30
1
32
1282-721-032
AirInletPlug
1
33
1282-721-033
SwitchPin
1
34
1282-721-034
Compressionspring
1
35
1282-721-035
Exhaustcover
1
36
1282-721-036
O-ring20.3X2.3
2
37
1282-721-037
Washer
1
38
1282-721-038
O-ring16X2.5
2
39
1282-721-039
AirConnector
1