Welbilt 3/8in. BUTTERFLY IMPACT WRENCH User manual

3/8in. BUTTERFLY IMPACT WRENCH
USER'S MANUAL
Item# 139272
WARNING:
Read carefully andunderstand all INSTRUCTIONSbefore operating. Failureto follow
the safety rulesand other basic safety precautions mayresult in serious personalinjury.
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WARNING
Some dust createdby power sanding,sawing, grinding, drilling,and other construction
activities contains chemicalsknown to theState of Californiato cause cancer, birth
defects or otherreproductive harm. Someexamples of thesechemicals are:
lead from lead-basedpaints,
crystalline silica frombricks and cementand other masonryproducts, and
arsenic and chromiumfrom chemically treatedlumber.
Yourrisk from theseexposures varies, dependingon how oftenyou do thistype of work.
Toreduce your exposureto these chemicals:work in awell-ventilated area, andwork with
approved safety equipment,such as thosedust masks thatare specially designedto filter
out microscopic particles.
Distributed by
Northern Tool +Equipment Co.,Inc.
2800 SouthcrossDrive West
Burnsville, MN5337-0499
Made inChina.

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For technical questionsand replacement parts,please call1-800-222-5381.
Thank you verymuch for choosinga Wel-Bilt , Product! Forfuture reference, please
complete the owner'srecord below:
Model: _______________ PurchaseDate: _______________
Save the receipt,warranty and theseinstructions. It isimportant that youread the entire
manual to becomefamiliar with thisproduct before usingit.
This machine isdesigned for certainapplications only. Thedistributor strongly
recommends that thismachine is notmodified and/or usedfor any applicationother than
that for whichit was designed.If you haveany questions relativeto a particular
application, DO NOTuse the machineuntil you havefirst contacted NorthernTool +
Equipment to determineif it canor should beperformed on theproduct.
Before using thisproduct, please readthe following instructionscarefully.
TECHNICAL SPECIFICATIONS
SAVETHIS MANUAL
Youwill need thismanual for thesafety warnings andprecautions, assembly, operating,
inspection, maintenance andcleaning procedures, partslist and assemblydiagram. Keep
this manual andinvoice in asafe and dryplace for futurereference.
SAFETY WARNINGS
WARNING: When usingtool, basic safetyprecautions should alwaysbe
followed to reducethe risk ofpersonal injury anddamage to equipment.
1.Keep workarea clean. Cluttered areasinvite injuries.
2.Observe workarea conditions. Do notuse machines orpower tools indamp or wet
locations. Don't exposeto rain. Keepwork area welllit. Do notuse electrically powered
tools in thepresence of flammablegases or liquids.
3.Keep bystanders,pets and childrenaway. Do notlet unauthorized peoplehandle
machines, tools, orextension cords.
4.Store idleequipment. When notin use, toolsmust be storedin a drylocation to inhibit
rust. Alwayslock up toolsand keep outof reach ofchildren.
5.Use theright tool forthe job. Do notattempt to forcea small toolor attachment todo
the work ofa larger industrialtool. Thereare certain applicationsfor which thistool was
designed. It willdo the jobbetter and moresafely at therate for whichit was intended.Do
not modify thistool and donot use thistool for apurpose for whichit was notintended.
6.Dress properlywhile working. Do notwear loose clothingor jewelry asthey can be
caught in movingparts. Protective, electricallynon-conductive clothes andnon-skid
footwear are recommendedwhen working. Wear restrictive haircovering to containlong
hair.
7.Use eye,face and earprotection. Alwayswear ANSI-approvedimpact safety goggles.
Wear afull face shieldif you areproducing metal filingsor wood chips.Wear anANSI-
approved dust maskor respirator whenworking around metal,wood, and chemicaldusts
and mists. Wear ANSI-approvedear plugs.
8.Do notoverreach. Keep properfooting and balanceat all times.Do not reachover or
across running machines.
Item
Square Drive
Free Speed
Max. Torque
Air Consumption
Description
3/8in.
10,000 RPM
75 ft-lbs
6 CFM
1/4in.- 18NPT
3/8in.
90 PSI
Description
Air Inlet Diameter
Min. Hose Size
Max. air pressure
Item
TM
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can damage thetool. You may haveto use penetratingoil, heat, ora mechanical
wrench to removethe fastener.
13.When youare finished usingthis tool, turnoff theair compressor anddisconnect the
air hose. Putthe AirImpact Wrenchaway in itsproper storage place.
MAINTENANCE
1.Your AirImpact Wrenchshould be keptclean and dry.
2.When notin use, storeyour tool ina suitable placewhere it willnot be exposedto water,
corrosive materials, orundue banging around.
3.If youare not usingan in-line oiler, you shouldinject a fewdrops of pneumatictool oil
into the airinlet of thetool and theoiler screw portafter every hourof continuous use.
4.If yourtool loses power, or younotice air leaks,take it toa certified technicianfor
service.
5.All repairs tothis tool shouldbe performed bya qualified servicetechnician.
PARTLIST
Description
Part#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Qty.
Housing
Oiler Screw
Throttle Lever
Anvil Bushing
Socket Retaining Ring
O-ring
Anvil
Hammer Pin
Hammer Cage
Hammer Dog
Cam
Oil Seal
Ball Bearing
Front End Plate
Rotor Blade
Rotor
Cylinder
Rear End Plate
Spring Pin
Ball Bearing
Back Cap Gasket
1
1
1
1
1
1
1
1
1
1
1
12
1
6
1
1
1
1
1
1
Description
Part#
23
22
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
Qty.
Back Cap
Spring
Valve Seat
O-ring
Spring
Plunger
O-ring
O-ring
Air Inlet Block
Spring
Steel Ball
Regulator
Throttle Pin
Washer
Retainer Ring
Spring Washer
Cap Screw
Rubber Nose Guard
Retainer Plate
Screw
1
2
2
2
2
2
2
1
1
1
1
1
2
1
1
4
4
1
1
2

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DIAGRAM

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1.Install astandard 1/4"Air Connector (notincluded) to theAir Inlet.First wrap the
threaded portion ofthe 1/4" airconnector with pipethread seal tapebefore threading it
into theAir Inlet.Tighten securely.
2.Attach astandard quick connector(not included) toyour 3/8" airpressure source hose.
Then attach theair hose tothe AirImpact Wrench.
NOTE: If you arenot using anautomatic in-line oiler, add afew drops ofpneumatic oil to
the AirInlet before attachingthe air hose.Add afew more dropsof oil afterevery hour of
continual use.
3.Set theair pressure regulatoron your aircompressor at 90PSI.
WARNING:Do not exceedthe recommended pressureof 90 PSI.Damage to your
tool and possiblepersonal injury and/orproperty damage mayresult.
4.Check theair line andits connections forair leaks. Makenote of these,and repair them
before using thistool.
NOTE: Turn offyour air compressorand disconnect theair pressure hosebefore
changing sockets ormaking any adjustmentsto this tool.Severe injury orproperty
damage may otherwiseresult.
WARNING:This tool generatesconsiderable torque whenin use.Always hold the
tool with bothhands when using,and brace yourselfto resist thetorque which willbe
delivered to theworkpiece.
5.Select theappropriate size 3/8"square drive impactsocket (not included)for your
needs. Push andsnap the socketonto the anvil.
Note: Impact Sockets mustbe rated for10,000 RPM orgreater.
6.Set thedirection of theAir ImpactWrench to"FORWARD" or"REVERSE". By moving
the ThrottleLever "Butterfly" tothe right, youare setting thetool to operateFORWARD.
Youmay control theamount of torqueto be appliedby rotating theRegulator.There are
settings from 1through 8, indicatingincreasing torque. Rockthe ThrottleLever "Butterfly"
to the leftto REVERSE thedirection of thetool.
NOTE: In thismanual, "FORWARD"refers to clockwiserotation, and "REVERSE"refers
to counterclockwise rotationof theAnvil. Alwaysbe aware ofthe direction ofthe threading
of the fasteneryou are workingon. While mostfasteners install withclockwise rotation,
some threads areintentionally the reverse.REVERSE FORWARDThrottle Lever
"Butterfly."
NOTE: The actual torquedelivered at eachof the eightsettings will dependon the air
pressure supplied tothe tool. We suggest thatyou test theactual torque bytightening a
nut or boltat each setting,then observing theresultant torque byusing a mechanical
torque wrench (notsupplied).
7.If installinga nut orbolt, set itas tight aspossible by handbefore tightening withthe Air
Impact Wrench.
8.Place thesocket (not included)over the fastener.
9.Grip theAir ImpactWrench tightlywith both hands,and rock theThrottle Lever
"Butterfly" to theright. Thetool will operateand tighten thefastener.
10.When thefastener is tightened,release theThrottle Lever "Butterfly"and remove the
tool from thefastener.
11.If possible, checkthe actual torqueapplied to thefastener with amechanical torque
wrench (not supplied).
12.If removinga fastener,grip theAir Impact Wrench tightly withboth hands androck the
Throttle Lever "Butterfly"to the left.The toolwill operate andloosen the fastener
(assuming that thefastener is astandard right-hand thread).
NOTE: Always check tobe sure ofthe thread directionof any fastenerbefore attempting
to install orremove it. Ifthe fastener isa left-hand thread,rock theThrottle Lever
"Butterfly" to theright for removal.
WARNING:If the fastenerwill not comeoff, first checkthe direction ofthe
thread. If youhave the threaddirection correct andthe fastener willstill not come
off, DO NOTINCREASE THEAIR PRESSURE tothe tool beyond90 PSI. This
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WARNING:The warnings, cautions,and instructions discussedin this instruction
manual cannot coverall possible conditionsand situations thatmay occur.It must be
understood by theoperator that commonsense and cautionare factors whichcannot be
built into thisproduct, but mustbe supplied bythe operator.
WARNING:The brass componentsof this productcontain lead, achemical
known to theState of Californiato cause birthdefects (or otherreproductive harm).
(California Health &Safety code 25249.5,et seq.)
ASSEMBLYAND OPERATING INSTRUCTIONS
9.Maintain toolswith care. Keep toolsclean and ingood condition forbetter and safer
performance. Follow instructionsfor lubricating andchanging accessories. Inspecttool
fittings and hosesperiodically and, ifdamaged, have themrepaired by anauthorized
technician. Thehandles must bekept clean, dry, and freefrom oil andgrease at alltimes.
10.Disconnect power. Disconnect fromair pressure sourcewhen not inuse.
11.Removeadjusting keys andwrenches. Check thatkeys and adjustingwrenches are
removed from thetool or machinework surface beforeconnecting it.
12.Avoidunintentional starting. Be surethe ButterflyThrottle Switch isin the neutral,
OFF position whennot in useand before connectingto pressure source.Do not carryany
tool with yourfinger on theButterfly ThrottleSwitch, whether itis attached ornot.
13.Check fordamaged parts. Before usingany tool, anypart that appearsdamaged
should be carefullychecked to determinethat it willoperate properly andperform its
intended function. Checkfor alignment andbinding of movingparts; any brokenparts or
mounting fixtures; andany other conditionthat may affect proper operation.Any partthat
is damaged shouldbe properly repairedor replaced bya qualified technician.Do not use
the tool ifthe ButterflyThrottle Switch doesnot function properly.
14.Guard againstelectric shock whenworking on electricalequipment, such as
your air compressor. Prevent body contactwith grounded surfacessuch as pipes,
radiators, ranges, andrefrigerator enclosures.
15.Replacement partsand accessories. When servicing,use only identical
replacement parts. Useof any otherparts will voidthe warranty. Only useaccessories
intended for usewith this tool.
16.Do notoperate tool ifunder the influenceof alcohol ordrugs, or ifyou are tired.
This may resultin serious injury.
17.Use propersize and typeair pressure lineand fittings. Therecommended air line
for this toolis 3/8" deliveringno more than90 PSI. Recommendedair inlet sizeis 1/4" -18
NPT.
18.Maintenance. For yoursafety,service and maintenanceshould be performed
regularly by aqualified technician.
19.You should maintaina proper regulatorand moisture trapin your airline at all
times.
Note: Performance ofthis tool mayvary depending onvariations in localair pressure.
Fig. 1