Welbilt 139270 User manual

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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.
Item# 139270
1/2in. AIR IMPACT WRENCH
USER'S MANUAL
WARNING:
Read carefully andunderstand all INSTRUCTIONSbefore operating. Failureto follow
the safety rulesand other basic safety precautions mayresult in serious personalinjury.

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For technical questionsand replacement parts,please call1-800-222-5381.
Thank you verymuch for choosinga , 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. 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.
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.
GENERAL SAFETYRULES
Read and understandall instructions.
Failure to followall instructions listedin the followingpages may resultin electric shock,
fire, and/or seriousinjury.
WORK AREA
1.Keep yourwork area cleanand well lit.Cluttered benches anddark areas invite
accidents.
2.Do notoperate pneumatic toolsin explosive atmospheres,such as inthe
presence of flammableliquids, gases, ordust. Pneumatic tools createsparks which
may ignite flammables.
3.Keep bystanders,children, pets andonlookers away whileoperating a pneumatic
tool. Distractions cancause you tolose control. Protectothers in thework area from
debris such asmetal filings andsparks. Provide barriersor shields asneeded.
Wel-Bilt
The distributor
TECHNICAL SPECIFICATIONS
PERSONAL SAFETY
1.Stay alert.Watch whatyou are doing,and use commonsense when operatinga
pneumatic tool. Donot use apneumatic tool whiletired or underthe influence ofdrugs,
alcohol, or medication.Amoment of inattentionwhile operating pneumatictools may
result in seriouspersonal injury.
2.Dress properly. Do notwear loose clothingor jewelry. Contain longhair. Keepyour hair,
clothing, and glovesaway from movingparts. Loose clothes,jewelry,or long haircan be
caught in movingparts.
3.Avoidaccidental starting.Be sure thetrigger is offbefore connecting tothe air
supply.Carrying pneumatic toolswith your fingeron the trigger, or connectingpneumatic
tools to theair supply withthe trigger on,invites accidents.
Item
Square Drive
Free Speed
Max. Torque
Air Consumption
Description
1/2in.
7000 RPM
230 ft-lbs
8 CFM
1/4in.- 18NPT
3/8in.
90 PSI
Description
Air Inlet Diameter
Min. Hose Size
Max. air pressure
Item
TM
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INSPECTION, MAINTENANCEAND CLEANING
1.Always makesure the triggeris in its"OFF" position, anddisconnect the toolfrom its
compressed air supplybefore performing anyinspection, adjustments, maintenance,or
cleaning.
2.Before eachuse, inspect thegeneral condition ofthe tool. Checkfor loose screws,
misalignment or bindingof moving parts,cracked or brokenparts, damaged airhose, and
any other conditionthat may affect its safeoperation. If abnormalnoise or vibration
occurs, have theproblem corrected beforefurther use. Donot use damagedequipment.
3.Daily: Witha clean cloth,remove all dirt,oil, and greasefrom the tool.If necessary, you
may use amild detergent. Donot use solvents,as damaged tothe tool mayoccur. Donot
immerse the toolin any liquids.
GENERAL TOUBLESHOOTING
l TROUBLES
ØTooldoes not runat a normalspeed or ata variable speed
ØThe motor blocks
ØAutomatic start whenconnected to compressedair
ØTorquereduces
ØAbnormal vibrating Heatrising at thehousing
l CAUSES
ØAir supply isnot enough (airpressure not ina required standard)
ØSpeed controller/switch breaksdown
ØRotor blades breakor wear out
ØDust gets intothe motor
ØThrottle lever orstarting trigger malfunctions
ØAir leakage atthe inlet orsomewhere else
ØBearing damages
ØCorrespondent O-rings wearout or outof position
ØLack of lubricating
l TROUBLE SHOOTING
ØCheck the airhose to seewhether it isblocked or twistedfor less airsupply
ØCheck the aircompressor to gainthe correct airpressure required
ØReplace rotor blades
ØDisassemble the tooland clean theinner structure underproper instructions
ØCheck and fixthe throttle leveror starting triggerfor accurate operation
ØCheck the airleakage and fixit under properinstruction
ØReplace new bearing
ØReplace the damagedO-ring or putit back incorrect position
ØOil/Lubricate the toolconsistently until itgains the rightspeed and torque.
l NOTE: For anyother problems thatcannot be correctedby the operator, please
contact the distributorfrom whom youpurchased the tool.

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DIAGRAM &PARTLIST
Description
Part# Description Part# Description Part# Description Part#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Housing
Valve Sleeve
Reverse Valve
Trigger
Pin
Bushing
Valve Stem
Steel Ball
Spring
Hose Adapter
Screen
Air Regulator
O-ring
Spring
Oil Seat
Screw
Anvil bushing
Anvil
Hammer Cage
Hammer Pin
Hammer Dog
Drive Cam
Pin Cylinder
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
38-1
39
40
41
42
43
Cylinder
Rotor
Rotor Blade
Front End Plate
Ball Bearing
Rear End Plate
Pin
Spring
Pin
Rear Gasket
Rear Cover
Washer
Screw
Protecting Rubber
Exhaust Deflector
Brass Silencer
Screw
Screw
Anvil Collar
O Ring
Rubber
44 Screw

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ASSEMBLYAND OPERATING INSTRUCTIONS
To attacha quick connector
WARNINGPrior to performingany assembly and/oradjustment procedures,
make sure theair supply hose(not included) isdisconnected from theimpact
wrench.
1.Prior touse, the impactwrench requires theattachment of aquick-connector into itsair
inlet. To do so,wrap approximately 3in.of pipe threadsealer tape (notincluded) around
the male threadsof a quick-connector. Then,firmly tighten thequick-connector into the
air inlet.
SPEED SELECTOR
Four speeds canbe selected.Tochange speed pushin and rotatethe selector dialat the
base of thehandle. Do notchange speeds whilsttool is inmotion.
LOOSENING
1.Attach thecorrect size socketto the anvil.
2.Set thecompressor's pressure regulatorto 90 PSI.Do not setthe compressor's outlet
regulator above 90PSI.
3.Connect thetool to theair compressor's hose.If leakage isdetected, disconnect theair
hose and fixit correct beforeuse.
4.Place thesocket over thenut to loosen.
5.Grip thetool firmly. Press theREVERSE valve infrom the areaabove the triggerso that
the REVERSE valveprotrudes out theback of thehousing. Press thetrigger to startthe
tool.
(Caution: Make surethe nut orbolt can withstandthe impact wrench'sworking
torque.)
NOTE:
ØIf the toolcannot loosen thenut, DO NOTraise the outletpressure of theair
compressor.
ØWhen the nutis moved, stopthe tool byreleasing the triggerand remove thetool
from the nut.Remove the nutfrom the socketif needed.
Tightening
The working torqueof the impactwrench is 230ft.-lbs. Make surethat the nutor bolt you
are using thetool to tightencan withstand therated torque.
1.Tightenthe nut asfar as youcan by hand.
2.Place thesocket on thenut. Press theREVERSE valve forwardso it protrudesout the
front of theHousing. Press thetrigger to startthe tool.
NOTE:
ØIf the toolstalls while tightening,DO NOTraise the outletpressure of theair compressor
above 90 PSI.
ØWhen the nuthas been tightened,remove the tooland socket. Donot over-tighten.
ØIf available, checkthe recommended torquespecifications for thenut. You should usea
torque wrench totorque the nutafter using theimpact wrench.
Fig. 1
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4.Remove adjustingkeys or wrenchesbefore turning onthe tool.A wrenchor a keythat is
left attached toa rotating partof the toolmay result inpersonal injury.
5.Do notoverreach. Keep properfooting and balanceat all times.Proper footing and
balance enables bettercontrol of thetool in unexpectedsituations.
6.Use safetyequipment. Alwayswear ANSI-approvedsafety glasses underneatha full
face shield, andhearing protection.
USE ANDCARE
1.Use clampsor other practicalways to secureand support theworkpiece to astable
platform. Holding thework by handis unstable andmay lead toloss of control.Only work
on a workpiecethat is properlysecured.
2.Do notforce or modifythe tool. Usethe correct toolfor your application.The correcttool
will do thejob better andsafer at therate for whichit is designed.
3.Do notuse the powertool if thetrigger does notturn it onor off.Any toolthat cannot be
controlled with theTrigger isdangerous and mustbe replaced.
4.Disconnect theair hose fromthe tool beforemaking any adjustments,changing
accessories, or storingthe tool. Suchpreventive safety measuresreduce the riskof
starting the toolaccidentally.
5.Store idletools out ofreach of childrenand other untrainedpersons. Tools are
dangerous in thehands of untrainedusers.
6.Maintain toolswith care. Donot use adamaged tool.Tagdamaged tools "Donot use"
until repaired.
7.Check formisalignment or bindingof moving parts,breakages of parts,damaged air
hose (not included),and any othercondition that mayaffect thetool's operation. If
damaged, have thetool serviced beforeusing. Many accidentsare caused bypoorly
maintained tools.
8.Use onlyaccessories that arerecommended by themanufacturer for yourmodel.
Accessories that maybe suitable forone tool maybecome hazardous whenused on
another tool.
SERVICE
1.Tool service mustbe performed onlyby qualified repairpersonnel. Service or
maintenance performed byunqualified personnel couldresult in arisk of injury.
2.When servicinga tool, useonly identical replacementparts. Follow instructionsin the
Inspection, Maintenance andCleaning section of thismanual. Use ofunauthorized
parts or failureto follow maintenanceinstructions may createa risk ofinjury.
SPECIFIC SAFETYRULES
1.To avoid accidentalinjury,always wearANSI-approved safety glasses,a full faceshield,
and hearing protectionwhen operating thetool.
2.Use clean,dry,regulated, compressed airat 90 PSI.Do not exceedthe recommended
90 PSI. Neveruse oxygen, carbondioxide, combustible gases,or any otherbottled gas
as a powersource for thistool.
3.When connectingto the airsupply: Prior toeach use, ifan automatic oileris not used,
add two dropsof air tooloil (not included)into the airinlet fitting ofthe tool.
4.Always disconnectthe tool fromits compressed airsupply source, andsqueeze the
trigger to releaseall compressed airin the toolbefore performing anymaintenance or
service.
5.The warnings,precautions, and instructionsdiscussed in thismanual cannot coverall
possible conditions andsituations that mayoccur.The operator mustunderstand that
common sense andcaution are factorswhich cannot bebuilt into thisproduct, but must
be supplied bythe operator.