ARO 7149-C User manual

OPERATOR’S MANUAL
SECTION M10
MANUAL 43
Released: 5/79
INCLUDING:OPERATION,INSTALLATION& MAINTENANCE
“22” SERIES SHORT GRINDERS
Revised: 1O-20-95
Form: 1566-2
Models: 7149-C, 7153-C,
7235-C and 7236-C
READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
To aid the operator’s understanding of proper and safe use of
grinders, the publications, “Use, Care and Protection of Abrasive
Wheels”, A.N.S.I. B7.1, and “Safety Code for Portable Air Tools”,
A.N.S.I. B186.1, can be purchased from:
American National Standards Institute, Inc.
1430 Broadway
New York, New York 10018
Operate this tool at 90 p.s.i.g. (6.2 bar) maximum air pressure
at the air inlet of the tool..
Disconnect air supply from tool before removing/installing
wire brush or rotary file or performing other maintenance pro-
cedures.
Keep hands, clothing and tong hair away from rotating end of
tool.
Anticipate and be alert for sudden changes in motion during
start up and operation of any power tool.
Never exceed rated r.p.m. of tool.
Wear suitable eye and hearing protection while operating tool.
Tool shaft can continue to rotate briefly after throttle is re-
leased.
Donot lubricate tools with flammable orvolatile liquids such as
kerosene, diesel or jet fuel.
Use tool only for purposes for which it was intended.
l Do not use excessive work pressure.
l Do not remove any labels. Replace any damaged label.
l Use only accessories recommended by ARO.
Repeated prolonged operator exposure to vibrations which may
be generated in the use of certain hand-held tools may produce
Raynaud’s phenomenon, commonly referred to as Whitefinger
disease. The phenomenon produces numbness and burning
sensations in the hand and may cause circulation and nerve dam-
age as well as tissue necrosis. Repetitive users of hand-held
tools who experience vibrations should closely monitor duration
of use and their physical condition.
The use of other than genuine ARO replacement parts may
result in safety hazards, decreased tool performance and in-
creased maintenance and may invalidate all warranties.
ARO is not responsible for customer modification of tools for
applications on which ARO was not consulted.
Tool maintenance and repair should be performed by autho-
rized, trained, competent personnel. Consult your nearest
ARO authorized servicenter.
It is the responsibility of the employer to place the information
in this manual into the hands of the operator.
For parts and service information, contact your local ARO distributor, or the Customer Service Dept. of the Ingersoll-Rand Distribution
Center, White House, TN at PH: [phone], FAX: [phone].
-0
ARO Tool Products
Ingersoll-Rand Company
1725 U.S. No. 1 North l P.O. Box 8000 l Southern Pines, NC 283888000
©1995 THE ARO CORPORATION l PRINTED IN U.S.A.
PartofworldwideIngersoll-Rand

FAILURETOOBSERVETHEFOLLOWINGWARNINGSCOULDRESULTININJURY.
m
Turn off air supply and disconnect
air supply hose before installing,
removing or adjusting any
accessory on this tool, or before
performing any maintenance on
this tool.
Air powered tools can vibrate In
use. Vibration, repetitive motions
or uncomfortable positions may
be harmful to your hands and
arms. Stop using any tool if
discomfort, tingling feeling or
pain occurs. Seek medical advice
before resuming use.
Do not carry the tool by the hose.
Do not use damaged, frayed or
deteriorated air hoses and
fittings.
Do not overreach when operating
this tool. Keep body stance
balanced and firm. Operate at 90 p.s.i.g.
(6.2 bar/620 kPa)
maximum air pressure.
This label must appear on
PN 48176-1 LABEL
no cost.
I
I
Wear hearing protection when
operating this tool.
WARNING = Hazards or unsafe practices which could result in severe personal injury, death or substantial
property damage.
CAUTION = Hazards or unsafe practices which could result in minor personal injury or product or property
damage.
NOTICE = Important installation, operation or maintenance information.
2

ROUTINE LUBRICATION REQUIREMENTS
Ml0
43
Lackof oran excessive amount of lubrication will affect the perfor-
mance and life of this tool. Use only recommended lubricants at
below time intervals:
EVERY 8 HOURS OF TOOL OPERATION - Fill lubricator reser-
voir of recommended F.R.L.with spindle oil (29665). Ifan in line or
air line lubricator is not used, apply several drops of spindle oil
(29665) in air inlet.
EVERY 40 HOURS OF TOOL OPERATION - Flush tool with a
solution of three (3) parts cleaning solvent to one (1) part spindle
oil.After flushing, apply asmall amount ofspindle oil in air inlet and
run tool for one minute to insure proper lubrication.
AIR SUPPLY REQUIREMENTS
Formaximum operating efficiency, the following air supply specifi-
cations should be maintained to this air tool:
l AIR PRESSURE - 90 p.s.i.g. (6.2 bar)
l AIR FILTRATION - 50 micron
l LUBRICATED AIR SUPPLY
l HOSE SIZE - 5/16” (8 mm) I.D.
An ARO® model C28231-810 air line FILTER/REGULATOR/LU-
BRICATOR (F.R.L.) is recommended to maintain the above air
supply specifications.
RECOMMENDED LUBRICANTS
Afterdisassembly iscomplete, all parts, except sealed or shielded
bearings, should be washed with solvent. To relubricate parts, or
for routine lubrication, use the following recommended lubricants:
Where Used
Air Motor
“O” Rings & Lip Seals
Gears and Bearings 36460
33153
Description
1 qt Spindle Oil
4 oz. Stringy Lubricant
5lb.“EP”- NLGI#1Grease
INSPECTION,MAINTENANCE AND INSTALLATION
trained, competent personnel. Tools, hose and fittings shall be re-
placed if unsuitable for safe operation and responsibility should
beassigned to besure that all tools requiring guards orother safe-
ty devices shall be kept in legible condition. Maintenance and re-
pair records should be maintained on all tools. Frequency of
repair and the nature of the repairs can reveal unsafe application.
Scheduled maintenance by competent authorized personnel
should detect any mistreatment or abuse of the tool and worn
parts. Corrective action should be taken before returning the tool
for use.
Disassembly should be done on a clean work bench with a clean
cloth spread to prevent the loss of small parts. After disassembly
iscompleted, all parts should bethoroughly washed in aclean sol-
vent, blown dry with air and inspected for wear levels, abuse and
contamination. Double sealed or shielded bearings should never
be placed in solvent unless a good method of m-lubricating the
bearing is available. Open bearings may be washed but should
not be allowed to spin while being blown dry.
Upon reassembling, lubricate parts where required. Use 33153
grease, or equivalent, in bearings. Use 36460 lubricant for “O”
ring assembly. When assembling “O” rings or parts adjacent “O”
rings, care must be exercised to prevent damage to the rubber
sealing surfaces. A small amount ofgrease will usually hold steel
balls and other small parts inplace while assembling.
Before mounting awheel, after all tool repairs and whenever a
grinder is issued for use, the speed ofthe grinder shall bechecked
with a tachometer to make certain that its actual speed does not
exceed its rated speed.
REPLACE GUARD.
When replacement parts are necessary, consult drawing contain-
ing the part for identification.
Always use clean, dry air. Dust, corrosive fumes and/or excessive
moisture can damage the motor of an air tool. An air line filter can
greatly increase the life of an air tool. The filter removes rust,
scale, moisture and other debris from the air lines. Low air pres-
sure (less than 90 p.s.i.g.) reduces the speed of the air tool. High
air pressure (more than 90 p.s.i.g.) raises performance beyond
the rated capacity of the tool and could cause injury. Shown below
is a typical piping arrangement.
Disconnect air supply from the tool or shut off air supply and ex-
haust (drain) line of compressed air before performing mainte-
nance or service to the tool.
MAIN LINES 3 TIMES
AIR TOOL INLETSIZE
It is important that the tools be serviced and inspected at regular
intervals for maintaining safe, trouble-free operation of the tool.
Be sure the tool is receiving adequate lubrication, as failure to lu-
bricate can create hazardous operating conditions resulting from
excessive wear.
Be sure that the air supply lines and connectors are of proper size
to provide a sufficient quantity of air to the tool.
Safety guards shall be in good functional condition. Damaged,
bent or severely worn guards shall be replaced. A guard which
has been subjected to a wheel failure is likely to be internally
weakened and shall not be reused.
BRANCH LINE 2 TIME
AIR TOOL INLET SIZE
Tool maintenance and repair shall be performed by authorized, COMPRESSOR
DRAIN REGULARLY
3

Thegrindermodelslistedinthemodelidentificationtableabovearefurnishedwithcolletassembly 41753-3(1/4”capacity)asstandardequipmentand areintendedfor
usewithmountedwheelsandshallnotbe usedwithothertype grindingwheelsunlessaproperwheelguard,recommendedbythegrindermanufacturer,isattachedto
thegrinder.See ”GrindingWheelMountingInstructions”, page 5.Other size colletinserts (1/8” or3/16”) orother collet assemblies listed onpage 9can be furnished
theabovelistedmodels.
Theabovelistedgrindermodelsthatarefurnishedwithoptionalarborassembly36934,mustalsobeequippedwithwheelguard44451 (2”maximumwheeldiameter).
Arborassembly 36934is for USe withtype 1non-threaded grindingwheels only.See “GrindingWheelMountingInstructions”,page 5 and “Accessories”,page 9.
Theabovelistedgrindermodelsthatarefurnishedwithoptionalconewheeladapter37292-( )areforusewithtypes 16, 17, 18, 18Rand19coneandplugwheelsand
shallnotbe usedwithothertype grindingwheels unlessa properwheel guard,recommendedby thegrindermanufacturer,isattachedtothe grinder.See“Grinding
WheelMounting Instructions”,page 5 and “Accessories” section,page 9.
OPERATION
Safe and efficient operation ofyour ARO grinder canbest be attainedby observing proper operating, inspection and maintenance procedures. Allow only competent
and
qualifiedpeople to operate grinder and subject each grinderto a regularinspectionand maintenanceprocedure.The qualified grinder operator mustbe carefully
instructedinthesafeoperationand useofthe grinder,includinga studyofthe manufacturer’sliterature.The grinderoperatorshouldhavea goodattituderegarding
safety.
OperatorSafety Equipment.The grinderoperatorshallwear safetygoggles or
faceshieldatalltimesthegrinderisturnedon.Otherprotectiveclothingshallbe
wornifnecessaryforsparkdeflection.Respiratorsshallbe usedinpoorlyventi-
lated areas. Adjacent personnel shall be protected fromgrinding sparks and
wheelfragmentsby protective barriers.
marked on the wheel, blotters or packaging, shall equal or exceed the rated
speed stamped on the grinder.
Ateachwheelchange,Arorecommendsthefreespeed becheckedbycompe-
tent authorizedpersonnel,usinga good reliable tachometer,to assurethatthe
Starting and Stopping.Before starting agrinder,the operator shall make surethat maximumtoolspeedislowerthanmanufacturersratedspeedforthewheeltobe
nooneisintheunguardedplaneofwheelrotation.Uponmountinganewwheel, used.A speed check shall never be made with grindingwheel on the grinder.
grindershallbe runatoperatingspeedwiththesafetyguardinplaceorina pro-
tectedenclosureforat least one minute beforeapplying the wheelto thework. Grindersshall not be operated at a speed exceeding its ratedspeed.
Checkspeed and balance of wheel. Ifa wire brushshouldever be usedwiththistool; insurethe speed ratingofthe
Beforea grinderis put down,the throttleshall be releasedandthe wheel shall brushisgreaterthanthespeedofthetoolthebrushistobe usedwithandinsure
cometo a stop.Toolrests, hangers or balancers are recommended. the brushconformstoapplicable safetystandards.Becertainthebrushiscom-
patible with mountingof the tool. Always use a wheel guard.
Useonlywheelswith adequate speed ratings.The maximumoperatingspeed Use recommendedguard.
SAFETY GUIDE FOR PORTABLE GRINDER USE
Some ofthemore common causes ofwheel breakage are: Improper mountingofthewheels,improperspeeds,abusiveoperationandcarelesshandling.
DO and DON’T
Doalwayshandleandstorewheelsin acarefulmanner(handlewith due
regard,grinding wheelsarefragile).
Grindingwheelsshallbestoredinprotectiveracksorcontainersandpro-
tectedfrommoistureandtemperatureextremes.
Dovisually inspectall wheelsbeforemountingfor possibledamageIn
transit.
Docheckmaximumoperatingspeedestablishedfor the wheelagainst
grindersspeed.
Docheck mounting flanges forcorrect size and design (see “Accessorles”
page11.
Dousemountingblotterssuppliedwith wheelswhereapplicable.
Dobesuretool is keptin first classoperatingcondition.
Doalwaysuseaguardcoveringatleast1/2of thegrinding wheel.
Doallownewlymountedwheels,with guardin place,to run atoperating
speedfor at leastoneminutebeforegrinding.
Doalwayswearsafetyglassesor goggleswhengrinding.
Doalwaysobserveall safetyruleswhenoperatingor handling portable
grinders.
Don’tuseawheelthat hasbeendropped.
Don’tforceawheelontothespindleoralterthesizeofthemounting.Ifthe
wheelwon’tfit thespindle,getonethatwill.
Don’tusemountingflangesonwhich thebearingsurfacesarenotclean
andflat,
Don’ttighten the mountingnut excessively.lighten only sufficiently to
drivethewheelandpreventslippage.
Don’tgrindonthesideofthewheelunlesswheelisspecificallydesigned
for that purpose.
Don’tstartthegrinderuntil thewheelguardis in place.
Don’tjamthewheelIntothework.
Don’tstanddirectly in front of a grinding wheel whenevera grinder Is
started.
Don’tgrind materialfor which thewheelis notdesigned.
GrindingIn groovesmaybehazardous.
4

GRINDING WHEEL MOUNTING INSTRUCTIONS
M10
43
Disconnectair supply fromgrinderorshutoffairsupply and exhaust (drain)air
lineofcompressedair beforemountingorremovingany abrasivewheelorwire
brush,or otherwise performingmaintenanceor service to the tool.
Check abrasive wheels prior tomounting forchips orcracks.Cracked orchipped
wheels shall not be used.
Caremustbetakenthatagrindingwheel,orwirebrush,ofthecorrectspeedrat-
ingisused.RatedwheelcapacitiesforArogrindersaremaximumonly.Regard-
lessoftheratedcapacityandspeed ofanyArogrinder,abrasivewheelsorwire
brushesshallneverbe operatedat a speed greaterthan that recommendedby
the wheel (orbrush)manufacturer.
Checkgrinderspeed beforemountinggrindingwheel (orothertype accessory)
withareliabletachometertomakesurethattheactualspeedofthegrinderdoes
notexceed its ratedfree speed.
Checkoperatingspeedofgrindingwheelorwirebrushtobeusedwiththegrind-
er.The maximumoperating speed marked on the grinding wheel, blotters or
packaging,shallequal or exceed the ratedfree speed ofthe grinder.Also,the
type andsize of the grindingwheel or wire brush shall be compatible with the
grindersize and type.
DressingAbrasive Wheels.Uponmountinga grindingwheel,thetoolshouldbe
operated at gradually increasing speed and checked for good balance of the
wheel. Ifunbalanceisobserved,thewheel shall be dressed.Ifdressingfailsto
establish acceptable balance, the wheel shall not be used.
MOUNTING INSTRUCTIONS FOR MOUNTED WHEELS
FOR USE WITH COLLET ASSEMBLIES.
Thecolletshallbe checkedto assureitto be ingoodconditionandproperlyaf-
fixed to the grinder spindle.
Themandrelshallbeinsertedtothefulldepthofthegrippingjawsofthecollet.At
least 1/2the mandrel length shall be insertedintothe Collet.
Themaximumsafeoperatingspeedformountedwheelsshallbedeterminedby
thefollowing:1.)Shapeandsize ofthe mountedwheel, 2.)Sizeofmandreland
3.)Overhang ofmandrel.Innocase shall the maximum safe operating speed rec-
ommendedby the wheel manufacturerbe exceeded.
WARNING:Workpressure,if excessive,canbethecauseoftroubleanda
sourceof danger,thru bendingor fractureof the mandrel.Pressurebe-
tweenthewheelandtheworkshouldneverbesoheavythatspringingof
the mandrelwill result.
MANDREL OVERHANG - DIMENSION “0”
FIGURE1
IMPORTANTNOTICE:lncreaslng the overhangofthemandrelwill reducethemaximumwheelsizethatcanbesafelyusedwiththespeedofthetool(dlmen-
slon“0”,figure1).Also,thelengthanddiameterofmandrelcombinedwiththesizeandshapeofthewheelaredeterminingfactorswhichmustbeconsid-
eredwhenselectingamountedwheelthatwill becompatiblewith theratedfreespeedofthetool.Itis recommendedthe“TablesofMaximumOperating
Speedsfor MountedWheels”oftheAmericanNationalStandardpublication87.1-1979previouslymentionedorotherreliablesource,beconsultedto
determinethe safeoperatingspeedof a particularsizeandshapeof wheelcombinedwith the sizeandoverhangof mandrel.
MOUNTING INSTRUCTIONS FOR TYPE 1 GRINDING WHEELS
Thedrivingflangeshallbe inspectedtoseethat itisofthe relievedtype, thatits
diameterisatleast 1/3thediameterofthewheelandthatitisfreeofnicks,burrs
andsharpedges.A blotter,separateorattachedtothewheelandat leastthedi-
ameter ofthe driving flange, shallbear againstthe driving flange. The wheel shall
be placed onthe spindle followingthefirstblotter. Thewheel shall notfittoo snug-
ly nortoo freely on the spindle. The normal diametral clearance between the
wheel and the spindle is approximately ,007” (.17 mm) maximum. Abrasive
wheelswhichdonotproperlyfitthespindleshallnotbeused.Separatereducing
bushings,unlesssuppliedorrecommendedbytheabrasivewheelmanufacturer,
shall notbe usedto adapt larger hole abrasive wheels.
A secondblotter,separateorattachedtothewheel andat leastthe diameterof
the outside flange, shall followthe wheel on the spindle. An outer flange, the
same diameter as the drivingflange,shall followthe secondblotter.The outer
flange
shallhavea reliefandcontactfaceidenticaltothe drivingflange,placedtoward
the blotter.
A spindle end nut shall followthe outer flange. Holdspindle fromrotatingand
screwspindle end nutsfirmlyagainst the outerflange, butonly tightenoughto
insuresufficientfrictionontheblotterfacestodrivethewheel.Excessivetighten-
ingcandistorttheflanges.The spindleshallprojectflushwithorpasttheendof
thespindleendnut.Tosecurewheelsthinnerthan the unthreadedlengthofthe
spindle,a spacer shallbe usedbetweenthe flange andthe spindle end nut. Such
aspacershallbeaprecisionpart,withparallelfacesrunningtruetothespacer’s
center hole.
The safetyguardshall be properlypositionedandthe mountingcheckedtoas-
sure secure positioning.The guard cover shall be closed and secured.
MOUNTINGINSTRUCTIONSFORTYPES16,17,18,18RAND19CONEANDPLUGWHEELS
FOR USE WITH 37292-( ) WHEEL ADAPTER
Thedrivingflangeshall be inspectedto seethat it isoftheflat,unrelievedtype,
thatitsdiameter isatleast1/3the diameterofthewheel and that itisfreeofnicks, diameter of the driving flange, shall bear against the driving flange.
burrsandsharpedges. Thegrindingwheelshallbetightenedonthespindlebyhand and shallbearfirmly
The spindle and wheel threads shall be inspected tosee that they are ofthe same
againsttheblotteranddrivingflange.Ifthewheelcannotbesecured,thespindle
pitchand diameterandablotter,separate orattachedtothewheelandatleastthe length shallbe checked.Ifthe spindle length iscorrect and the cone wheel stillwill notfitfirmlyagainsttheblotteranddrivingflange,thewheelshallnotbeusedand
a proper fittingwheel shall be selected.
5

DISASSEMBLY AND ASSEMBLY OF TOOLS
Disconnect air supply from tool or shut off air supply and exhaust
(drain) line of compressed air BEFORE performing maintenance
or service to tool.
Before starting to disassemble or assemble this tool (any part or
completely), be sure to read “Inspection, Maintenance and lnstal-
lation” section.
Tominimize the possibility of parts damage and for convenience,
the steps for disassembly or assembly listed on the following
pages are recommended.
The basic sections and instructions for removing them from the
tool are as follows:
MOTOR SECTION
Remove collet nut (41751) and collet insert (41750-). Using a
5/32” hex type wrench, insert hex wrench thru collet body and into
hex end of rotor to hold rotor from turning and remove collet body
(41752).
Locating on flats of head, secure head in a suitable holding de-
vice. Using a strap type wrench on motor housing, unthread and
remove motor housing from head. Remove motor assembly from
housing. For complete disassembly of motor, see page 7.
HEAD SECTION
Throttle components can be serviced without removing head sec-
tion from tool. See page 8 for complete disassembly.
To remove screen (44933) from housing, remove retainer ring
(35619) and exhaust sleeve (43833-l).
TYPICAL CROSS SECTION OF TOOL
6

MOTOR SECTION
M10
43
DISASSEMBLY
Remove motor from housing (see page 6). Grasp cylinder in one race of bearing. Assemble cylinder over rotor, aligning air inlets of
hand and tap threaded end of rotorwith a soft face hammer; motor cylinder and end plate and roll pin (Y17B-20) with hole in end
will come apart. plate (largest hole). Assemble blades to rotor - straight side out.
Assemble spacer (30437) and end plate (30432) to rotor, press-
ASSEMBLY
ing on inner race of bearing.
NOTE: Pack bearings with ARO 33153 grease and coat i.d. ofcyl- Be sure rotor does not bind (if rotor binds, tap threaded end lightly
inder with ARO 29665 spindle oil upon assembly. to loosen) and assemble collet body (41752) to rotor. Assemble
Assemble bearings into end plates, pressing on outer race of motor and spacer (30440) into housing and secure with head sec-
bearings. Assemble end plate (30129) to rotor, pressing on inner tion.
MOTOR ASS’Y NO. R.P.M. ROTOR NO. BLADE NO. BLADE QUANTITY
37510-1 18,000 30435-l 41520 4
41389-3 14,500 32374-l 41520 6
NOT INCLUDED WITH MOTOR ASS’Y #INCLUDED WITH CYLINDER 30972
PARTSMARKED THUS ARE INCLUDED IN SERVICE
KIT NO. 40102-l. SEE PAGE 9.

HEAD SECTION
DISASSEMBLY ASSEMBLY
Remove valve plug (30600) and valve components can be re-
moved from head. To remove lever throttle, remove roll pin
(Y178-28). To remove button throttle, remove roll pin
(Y178-212).
Assemble “O” ring (Y325-7) to valve stem. Assemble valve stem
into head. Assemble spring (30609) and regulator (30603) into
head, aligning hole in regulator with air inlet of head. Assemble
seal (30602) to head and secure valve components with “O” ring
(Y325-13) and valve plug (30600).
LEVER 30610
THROTTLE BUTTON30346
ADAPTER 328
VALVE PLUG 30600
I
30547 LEVER HEAD ASSEMBLY
JI INCLUDED IN 47052 LOCK-OFF LEVER ASSEMBLY
47052 LOCK-OFF LEVERASSEMBLY
* 46548 ROLL PIN
32654 ADAPTER
HOUSING 30653-l 23902-210 CONNECTOR, l/4”
(NOT INCLUDED IN 30547-l
LEVERHEAD ASSEMBLY)
OPTIONAL 30547-l LEVER HEAD ASSEMBLY - LOCK-OFF TYPE
INCLUDES PARTS SHOWN IN THIS GROUP (EXCEPT CONNECTOR), PLUS: VALVE STEM (46135), “O” RING (Y325-7), SPRING (30609), AIR
REGULATOR (30603), SEAL (30602), “O” RING (Y325-13) AND VALVE PLUG (30600).

ACCES
41753-( ) 3-PIECE COLLET ASSEMBLY
COLLET SUE COLLET
, ASSEMBLY NO. INSERT NO. ,
41753-I 1/8” 41750-1
41753-2 3/16 41750-2
41753-3 1/4” 41750-3
41753-11 3 mm 41750-11
41753-12 6 mm 41750-12
COLLET NUT - 41751 COLLET NUT DIA. - 3/4”
COLLET BODY - 41752 COLLET BODY DIA. - 21/32”
3/8” - 24 THREAD OVER ALL LENGTH - 2 1/4”
44127-( ) ERICKSON 3-PIECE COLLET ASSEMBLY
1 COLLET 1 SUE I COLLET 1
ASSEMBLY NO. INSERT NO. .
44127-1 3/32” - 1/6” 32966-l
44127-2 1/8” - 5/32” 32966-2
44127-3 5/32” - 3/16” 32966-3
441274 3/16” - 7/32” 329664
44127-5 7/32” - 1/4” 32966-5
44127-6 1/4” - 9/32” 32966-6
44127-7 9/32” - 5/16” 32966-7
44127-8 5/16” - 11/32” 32966-8
44127-9 11/32” - 3/8” 32966-9
COLLETNUT- COLLET NUT DIA. - 51/64”
COLLET BODY - 44125 COLLET BODY DIA. - 43/64”
3/8” - 24 THREAD OVER ALL LENGTH - 2 7/32”
ORIES
Ml0
33226-( ) 3-PIECE COLLET ASSEMBLY 43
COLLET SIZE COLLET
ASSEMBLY NO. INSERT NO.
33226-4 1/8” 31812-4
33226-6 3/16” 31812-6
33226-8 1/4” 31812-8
COLLET NUT - 33220 COLLET NUT DIA. - 15/16”
COLLET BODY - 33216 COLLET BODY DIA. - 5/8”
CUP RING - 33221 OVER ALL LENGTH - 2”
NOSE RING - 33222 3/8” - 24 THREAD
37292-( ) CONE WHEEL ADAPTER
NOT SHOWN, WING NUT (2) Y89-4
(INCLUDED WITH GUARD)
SERVICE KIT NO. 40102-I
PART PART
QTY NUMBER DESCRIPTION QTY NUMBER DESCRIPTION
1 30438 Bearing 1 44933 Screen
1 30602 Seal 1 Y65-7 Bearing
1 30609 Spring 1 Y325-7 “O” Ring
6 41520 Rotor Blade 1 Y325-13 “O” Ring
1 41795 Motor Oil 2 Y32-30 “O” Ring
9

TROUBLE SHOOTING
LISTED BELOW ARE SOME OF THE MOST COMMON CAUSES FOR THE GRINDER TO MALFUNCTION. MALFUNCTIONS BEYOND THE SCOPE OF THIS MANUAL
SHOULD BE BROUGHT TO THE ATTENTlON OF YOUR ARO REPRESENTATIVE OR RETURN THE TOOL TO THE FACTORY FOR REPAIR.
CONDITION
LOW SPEED AND
POWER OR GRIND-
ER WILL NOT RUN.
THROTTLE VALVE 1. DAMAGED VALVE PIN OR COM-
HARD TO OPERATE. PONENTS.
TOOL WILL NOT
SHUT OFF. 1. DAMAGED VALVE COMPONENTS.
POSSIBLE CAUSE
1. INADEQUATE AIR SUPPLY.
2. AIR REGULATOR (30603) IMPROPER-
LY ADJUSTED.
3. AIR INLET OR EXHAUST SCREEN
PLUGGED.
4. OBSTRUCTION IN THROTTLE VALVE
OR VALVE NOT OPENING.
5. MOTOR NOT BEING PROPERLY LU-
BRICATED.
6. ROTOR BLADE IS MISSING, INCOR-
RECTLY INSTALLED, BADLY WORN
OR BEARING FAILURE.
CORRECTIVE ACTION
1. CHECK AIR SUPPLY FOR CORRECT REGULATOR ADJUST-
MENT (90 P.S.I.G. MAX. WHEN TOOL IS OPERATING).
2. CHECK REGULATOR ADJUSTMENT TO BE SURE OF MAXIMUM
AIR FLOW.
3. INSPECT, WASH CLEAN.
4. DISASSEMBLE THROTTLE, CLEAN, INSPECT FOR OBSTRUC-
TIONS OR DAMAGED PARTS.
5. APPLY 2 OR 4 DROPS OF SPINDLE OIL IN AIR INLET. RUN TOOL
TO ALLOW OIL TO ENTER MOTOR - BE CERTAIN OILER IS
FULL OF OIL.
6. DISASSEMBLE MOTOR, CLEAN AND INSPECT FOR PROPER
INSTALLATION, REPLACE BLADES AND/OR BEARINGS IF NEC-
ESSARY.
1. DISASSEMBLE VALVE COMPONENTS, INSPECT, REPLACE IF
NECESSARY.
1. DISASSEMBLE VALVE COMPONENTS, INSPECT, REPLACE
PARTS IF NECESSARY.
DIMENSIONAL DATA
(49mm)
2-9/32 (APPROX.)
(56mm)
10