ARO 8268-A6-1 User manual

Tool Products
OPERATOR’S MANUAL
INCLUDING:OPERATION,INSTALLATION& MAINTENANCE
SUPERPAR-A-MATIC@SELF-FEEDDRILLS
WITHDUALSPINDLEDRILLINGHEAD
Model 8268-A( )
SECTION
M106
MANUAL
60
Released: 10/80
Revised: 10-6-95
Form: 1824-2 .
IMPORTANT: READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
FEATURES:
BUILT IN 4-WAY VALVE
MANUAL OR REMOTE OPERATIONS
SPINDLE ADJUSTMENT FROM 3/4” TO 3-3/4” CENTERS
ADJUSTABLE STROKE LENGTHS
ADJUSTABLE FEED RATES
SPEED RANGES FROM 350 TO 4600 R.P.M. AVAILABLE
OPTIONAL COLLET CHUCKS
1/4” MALE N.P.T.F. AIR INLET TO MOTOR
1/8” FEMALE N.P.T.F. REMOTE CONTROL PORTS
INDEX PAGE
MODELIDENTIFICATION ................................................................ .
GENERAL DESCRIPTION AND OPERATION ......................................... 2 and 3
SET-UP PROCEDURE ............................................................. 4 and 5
AIR AND LUBE REQUIREMENTS ......................................................... 6
MAINTENANCE ........................ ................................................. 6
RECOMMENDED AIR INLET SYSTEM . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
REMOTE CONTROL START AND RETRACT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DISASSEMBLY AND ASSEMBLY ................................................. 9 thru 15
ACCESSORIES ................................................................ 16thru 18
SERVICE KITS ................... ...................................................... 18
TROUBLESHOOTING ................................................................ 19
DIMENSIONALDATA ................................................................. ..2 0
For parts and service information, contact your local ARO distributor, or the Customer Service Dept. of the Ingersoll-Rand Dis-
tribution Center, White House, TN at PH: [phone], FAX: [phone].
ARO Tool Products
Ingersoll-Rand Company
INGERSOLL-RAND®
1725 U.S. NO. 1 North l P.O. Box 8000 l Southern Pines, NC 2838843000
©1995 THE ARO CORPORATION l PRINTED IN U.S.A.
PROFESSlONAL TOOLS

MODEL IDENTIFICATION
MODELS WITH -EU SUFFIX ARE “EC” COMPLIANT MODELS.
GENERAL DESCRIPTION AND OPERATION
Safe and efficient operation of your ARO Self-feed drill can best be attained by observing proper operating and maintenance proce-
dures. Keep hands and clothing away from rotating end of tool and all other moving parts. Eye protection should be worn at all times while
operating power tools. Disconnect air supply line to tool or shut off air supply line to tool and exhaust (drain) air line of compressed air
BEFORE removing or installing a bit, reamer or other such device or otherwise performing service or maintenance to the tool.
--
(SHOWN WITH COVER REMOVED
PAGE 2 OF 20

GENERAL DESCRIPTION AND OPERATION
M 106
60
The Models8268-A( ) Dual Spindle Drills ore designed to automati-
cally feed to a preset depth, trip and return.
Thefollowing is a brief description of the various sections and their
function.
GEARING:Thegearing for these modelsis available in single or dou-
ble reduction planetary gearing assembliesto provide five (5) final
spindle speeds.
AIRMOTOR:Thevanetypeair motordevelopsa minimum of .7horse-
power.The motor will start within the first 1/4 inch of strokeand re-
main running thru the forward and retract stroke, automatically
shutting off upon completion of the cycle.
AIRPISTON:Theair piston is of the double acting type, providing the
forward and retract strokemovement.Thepiston has an area of 2.8
squareinchesand developsapproximately250 poundsofthrustwith
90 p.s.i.g.at the piston inlet.
VALVESECTION- Thevalve section housesthe SPOOLVALVE,BUT-
TONBLEEDVALVESandthe FEEDCONTROLVALVES.TheSPOOLVALVE
is a 4-way bleed type valve used to port air to the piston for the for-
ward and retract stroke. Positioing ofthespoolvalveis accomplished
by actuating the “F” or “R” Button BleedValves,located at the rear
of the head.
The BUTTONBLEEDVALVESexhaust air from the ends of the spool
valve,causingittoshifttotheforwardandretractpositions.Depressing
the Button BleedValve marked “F” shifts the spool valve to the for-
ward feedposition.Whenthedrill reachesthe preset depth,theStroke
Adjustment Screw will depressthe ButtonBleedValve marked “R”,
this shiftsthe spoolvalveto the retractpositionand retractsthe piston
completing the cycle.
Theneedletype FEEDCONTROLVALVESregulatethe flow of air from
the piston thus regulating the forward and retract roteof feed of the
piston.TheFeedControlValvemarked“F” regulatesthe forward feed
rate of the piston and the FeedControlValve marked “R” regulates
the retract feed rate of the piston.
TOOLRETRACTEDSIGNALPORT- this port is located in rear end of
PistonRod.Theportis pressurizedwhen the motorstartsand remains
pressurized during the drilling cycle until the motor shuts off when
the unit is fully retracted.
MANUAL OPERATION
Themodels8268-A() areshipped fromthe factory with the MANUAL
BLEEDVALVE(24130) installed in the “F” portatthe rearofthe Valve
Housing. If the unit is to be operated manually; loosen the two (2)
Screws(Y211-102)securing Cover(40582-) tothe ValveHousingand
removethe cover.Removethe ButtonBleedValve from the “F” port
atthe rearofthe ValveHousingand removethe PipePlug(Y227-2-L)
from the ”F” port at the top of the Valve Housing. Install the Button
BleedValve (24130) in the “F” port at the top of the Valve Housing
and seal off the “F” port at the rear of the Valve Housing using the
PipePlug(Y227-2-L).Replacethe Cover(40582-) and tighten Screws
(Y211-102)securing Coverto Valve Housing
Each time the BUTTONBLEEDVALVEmarked “F” IS depressedthe
unit will start in the advancing (forword) mode.Theunit will continue
to advance until the BUTTONBLEEDVALVEmarked “R” has been
depressed sufficiently to retract the unit. See SET-UPPROCEDURE,
PAGE4.Should on EMERGENCYRETRACTbedesired,install an addi-
tional Button Bleed Valve in the “R” port at the top Valve Housing.
TheEmergencyButtonBleedValvecon beusedto immediatelyretract
the unit in the event of a misaligned port or similar situation.
REMOTE CONTROL OPERATION
The Models 8268-A( ) con be used OSo single unit application or
in a multiple unit application. REMOTESTARTis accomplished by use
of a PressureBleedValve (port No.9600) installed in either the “F”
port at the rear of the ValveHousing or the “F” port in the top of the
Valve Housing.This pressurebleed valve is then connected, by me-
ansof 1/8” I.D.tubing, to a remoteoperatedvalve which, when actu-
ated, feeds air pressure to the PressureBleed Valve (9600). The
PressureBleedValvethen opens, bleeding air from “F’ part of Valve
Housing, causing Spool Valve to shift to the Forward Feedposition
thus starting the advancing (forward) mode of the unit.
REMOTERETRACTis accomplished by useof o PressureBleedValve
(port no.9600) installed inthe “R” portlocatedatthetop ofthe Valve
Housing. This pressure bleed valve is then connected to o remote
MANUALLYoperatedvalve in the some manner as the RemoteStart
circuit. This valve is used as an emergency Retractin the event of
a part misalignmentorsimilar situationonlyasthe unit,when properly
set-up and applied, will automatically retract and return to the start
position after reaching o pre-setdepth or stroke.SeeSet-UpProce-
dure page 4 and illustration on page 8.
SPECIALNOTE:Theair inlet and remoteportsof this tool hovetapered pipe threads and should not requirethread sealants,such as sealant
tapes or pipe joint compound. Thread sealants used improperly can cause valve or tool malfunction.
FORM 1824-2 PAGE 3 OF 20

MOUNTING
The nose end of the Outer Sleeve ISprovided with o 2-1/2”-16L.H.
thread (removethread guard for use) and a 2-1/2” x 1-1/4”long pilot
diameterfor fixtured mounting. A groove is also provided in the Out-
er Sleevefor a Retaining Ring which is supplied with the foot and
flange type mounting brackets.The foot and flange type mounting
brackets are available for tool mounting-see AccessoriesSection.
Thetool can be mounted in any position desired without impairing
the function of the tool.
SET-UP PROCEDURE
NOTE:For set-up purposes; loosen the two (2) Screws (Y211-102)
securing Cover(40582-) to the ValveHousingand removethe Cover.
Afterthe set-up has been completed, replace the cover and tighten
thetwo (2) Screws(Y211-102)securing Coverto ValveHousing.CAU-
TION:Adjustwith care, Keepfingers clear from betweenAdjustment
Screwsand Valvesor Housing.Keepclear of rotating endof unit with
hands and/or clothing.
edgeofthe screwandtheButtonBleedvalve(24130)ISsllghtlygreater
than the Total StrokeLength.Start the unit and let the unit advance
until Adjustment Screw “A” contacts Stud then rotate Adjustment
Screw “B’ until screw depressesButton Bleed Valve (24130) suffi-
ciently to retract the unit.
A minimum distance of 1/4 inch must be maintained between the
work piece andthe drill point with the drilling unit in its fully retracted
position when setting-upthe unit for operation.This will allow the Air
Motorto start and reachfree speed beforethe drill point touches the
work piece.
FEEDRATECONTROLVALVES:The retract FeedRateControl Valve
marked “R” located at the top of the Valve Housing, regulates the
rote of returnof the piston.Openthis Valveapproximately 1-1/2turns
(counter-clockwise) from the closed position for setting-up of unit.
Close the Feed Rate Control Valve marked “F” by turning it in
(clockwise).
STROKEADJUSTMENT:DeterminetheTotalStrokeLengththe drill must
travel to performthe drilling operation (see figure below). Adjustthe
length of the stroke by rotating the StrokeAdjustmentScrew “A” so
the distance between the leading edge of the screw and the Stud
equals the Total Stroke Length.Secure Screw with Jam Nut.
Startthe unit by depressingthe ButtonBleedValve (24130) marked
“F’ then, slowly turn the Valve counter-clockwise opening the Valve
until the desired rate of forward feed is attained.
Afinal adjustmentof the rateof return(retraction) con be modewith
the Feed RoteControl Valve marked “R”.
Afteradjusting AdjustmentScrew“A” to equalthe total strokelength, SeeSet-UpInstructionsfor optional HydraulicCheckunit for controll-
rotate Adjustment Screw “B” so the distance between the leading ing thrust during drilling and/or at break-through.
SPINDLE ADJUSTMENT
Y-- --Y
Fig. 1
FOR SIMPLE SPINDLE ADJUSTMENT the “X” “X” and “Y” “Y” AXIS OF
THE COMPONENT SHOWN IN FIG. 1 SHOULD COINCIDE WITH THE “X”
“X” AND “Y” ‘Y” AXIS OFTHEDRILL HEAD AND DRILLING UNIT AS SHOWN
IN FIG 2 THE SPINDLES SHOULD THEN BE ADJUSTED IN THE MANNER
SHOWN IN FIGS 3 AND 4
IMPORTANT-
IFTHE PROCEDUREIS NOT FOLLOWEDAND BOTHSPINDLES ARE MOVED
OUT TO ONE SIDE OF THE HEAD ANY SUBSEQUENT SPINDLE ADJUST-
MENT WILL RESULT IN THE NECESSITY OF HAVING TO RE-ADJUST THE
RELATlONSHlP BETWEEN THE DRILLING UNIT AND THE COMPONENT
FIG 2 SHOWS THETWIN SPINDLE HEAD WITH THESPINDLES SETTO THE
MINIMUM CENTERS
TO ADJUST THE SPINDLES AS SHOWN IN FIG 3 LOOSENBOTH SCREWS
“A” AND ROTATEBOTH TURRETS IN THE DIRECTION INDICATED BY THE
ARROWS TO THE APPROXIMATE CENTERS THAT ARE REQUIRED
ROTATETHE COMPLETE DRILL HEAD ASSEMBLY TO BRING BOTH SPIN-
DLESTO THE REQUIRED“Y” “Y” AXIS AS SHOWN IN FIG 4. FINALLY AD-
JUST SPINDLE CENTERS ON AXIS “Y” “Y” TO SUIT GAUGE OR DRILL
BUSHINGS AND TIGHTEN SCREWS “A” SECURELY
Fig.4
PAGE 4 OF 20

SET-UP PROCEDURE FOR OPTIONAL HYDRAULIC CHECK
M106
TheHydraulic Checkunit is an accessoryitem usedwith the Models
8268-A( ) when controlled thrust is required during drilling and/or
60
MOUNTING INSTRUCTIONS
at break-through.The Hydraulic Check is a sealed unit with a low
friction diaphragm. Thehydraulic fluid neednot be replenished.The
Hydraulic Check is available in I, 2 and 3 inch stroke lengths. AssembleMounting Bracket(40316) with Hydraulic Check(38922-)
to the Valve Housing with two (2) Screws (Y157-44)and Washers
(30997).
SET-UP INSTRUCTIONS TO CONTROL RATE OF FEED:
Measuredistance from Drill Pointto WorkPiece(DISTANCE“Y”).
DISTANCE“X” betweenthe HydraulicCheck(38922) and the Trip
Bracket (417l3-) must be less than DISTANCE“Y” to prevent
damageto the Drill Pointwhen it approachesthe WorkPiece.This
can be adjustedby looseningthe Screws(Y157-44)in the Mount-
ing Bracket(40316)andsliding the HydraulicCheckto the desired
position. RetightenScrews (Y157-44)before operating unit.
Increasethe air flow thru the FeedControlValve by opening two
(2) turns from closed.This will allow the Drill to advance rapidly
FEEDRATE ADJUSTMENT
until the Trip Bracketcontactsthe plunger ofthe Hydraulic Check.
TheHydraulic FeedRateAdjustmentis located at the name plate
end of the Hydraulic Check.Rotateextendedspindle until the slot
on spindle is located midway betweenthe highest and the lowest
settings.
StartTool and the Drill will advance at a rapid rate, until the Trip
Bracket contacts the plunger of the Hydraulic Check.
Slowly rotatethe Hydraulic FeedRotecounter clockwise for faster
feed rate or clockwise for slower feed rate.
TO CONTROL
When controlled breakthrough is required, the Hydraulic Check
must beset-upsothe distance betweenthe Plunger and the Trip
Bracket(41713)(DISTANCE“X”) is lessthan the distance fromthe
PARTS INDICATED BY ASTERISK (*) ARE INCLUDED
IN 40591-( ) HYDRAULIC CHECK ASSEMBLY.
SEE PAGE 18 FOR HYDRAULIC CHECK
DIMENSIONAL DATA,
BREAKTHROUGH
2. Drill Pointto the oppositeside oftheWorkPiece(DISTANCE“W"). Set-upprocedurefor the PAR-A-MATICSELF-FEEDDRILLwill bethe
same as explained in Set-UpProcedure,page 4.
FORM 1824-2 PAGE 5 OF 20

AIR AND LUBEREQUIREMENTS
AIRPRESSUREof 90 p.s.i.g.(6 bar) at air inlet of tool is required for
maximum motor efficiency. An air regulator should be installed to
maintain this pressure when tool is in operation.
FILTEREDANDOILEDAIRwill allow the tool to operatemoreefficient-
ly and yield a longer life to operating parts and mechanisms.A line
filter capable of filtering particles larger than 50 microns should be
used with o line oiler.
FILTER-REGULATOR-LUBRICATOR (F.R.L.) assembly model
C28231-810 is recommended for use with this air tool. The ca-
pacity of the individual Filter-Lubricator is adequate to provide
clean (40 micron) oiled and regulated air for the tool. See recom-
mended air inlet system, page 7.
RECOMMENDEDLUBRICATION:Gearingshould be greaselubricated
every 160 hours of operation. Inject grease, (33153) or equivalent,
1to 2 strokesthru greasefitting in gear housing. NOTE:Spindle must
be extended from outer sleeve sufficiently to expose grease fitting
in gear housing.
DUALSPINDLEATTACHMENTcon belubricatedthru eithersockethead
setscrew located on opposite sides of dual spindle housing,Thefelt
type oil reservoirs contained in the housing should be saturated with
a good multigrade 10W/30 oil at approximately every 160 hours of
operation.
MOTORis lubridcated thru air inlet of unit by use of a lubricator in-
stalled in air Iine.SpindleOil29665, 1qt.(.9 liter) container or equiva-
lent type 1 light spindle oil is recommended for motor lubrication.
Consult manufacturer of air line lubricator being used to insure oil
used is compatible with construction of lubricator bowl.
BEARINGS,GEARS,ETC:grease33153, 5lb. (2.3 kg) can, or equiva-
lent grade.
“0” RINGS:Lubricant 36460, 4 oz. (113g) tube for lubrication and
installation of “0” Rings.
CAUTION:An excessive amount of lubricant in a tool will affect the
speed and power. Eachset of planetary gearing should contain ap-
proximately 1/4 oz. (7 g) of grease.
RECOMMENDEDHOSESIZE- 3/8” (10mm) nominal insidediameter.
PART NO.
29665
WHERE USED DESCRIPTION
A HIGH QUALITY LIGHT TURBINE OR SPINDLE OIL. RUST INHIBITED. WITH VISCOSITY OF
AIR MOTOR 100-150 S.U.S. AT 100’F. OIL IS COMPATIBLE WITH POLYCARBONATE TYPE AIR LINE
LUBRICATOR BOWLS.
33153 GEARS & BEARINGS A HIGH QUALITY “EP” EXTREME PRESSURE ANTI-FRICTION BEARING AND GEAR GREASE,
NLGI NO. 1 FREE OF CORROSIVE MATTER AND FILLERS, WITH A VISCOSITY OF APPROX. 750
S.U.S. AT 100°F.
36460 O-RINGS &
LIP TYPE SEALS A STRINGY LUBRICANT FOR RUBBER SEALS, WITH GOOD ADHESIVE QUALITIES.
MAINTENANCE
DISCONNECTAIRSUPPLYfrom tool or shut off air supply line to tool
and exhaust (drain) air line to tool of compressedair BEFOREper-
forming service or maintenance to tool.
AIRTOOLSare made of precision parts and should be handled with
reasonablecarewhen servicing.Excessivepressureexertedby a hold-
ing devicemaycausedistortionof a part.Apply pressureevenlywhen
disassembling (or assembling) parts which have a pressfit. When
removing or installing bearings, apply pressureto the bearing race
that will be the pressfit to the mating part; if this is not practiced,
Brinellingofthe bearingracesmayoccur making replacementneces-
sary.It is important that the correct tools and fixtures are usedwhen
servicing this Air Tool.
DISASSEMBLYshould be done on a clean work bench with o clean
cloth spread to preventthe loss of small parts.After disassembly is
completed;all partsshould bethoroughly washed in o clean solvent,
blown drywith air and inspectedfor wear levels,abuseand contami-
notion.
Double sealed or shielded bearings should never be placed in sol-
vent unless a good method of re-lubricating the bearing is available.
Open bearings may be washed but should not be allowed to spin
while being blown dry. When REPLACEMENTPARTSare necessary,
consult drawing containing the part for identification.
BEFOREREASSEMBLING,lubricate parts where required. Use33153
Grease,or equivalent, in bearings.Use36460 Lubricantfor “0” Ring
Assembly.When assembling “0” rings, care must be exercised to
prevent damage to the rubber sealing surfaces.A small amount of
greasewill usually hold steelballs and othersmall partsin placewhile
assembling.
WHENORDERINGPARTS,be sure to list PARTNUMBER,PARTNAME,
MODELNUMBERANDSERIALNUMBEROFTOOL.USEONLYGENUINE
AROREPLACEMENTPARTS.
PAGE 6 OF 20

RECOMMENDED POWER AIR INLET SYSTEM
M106
60
MODEL 23903 200 CONNECTOR
14 FEMA:ENPTF
MODEL 23103 300 COUPLER
44908-() 3/8” I.D HOSE ASS’Y
3/8” N.P.T F. MALE FITTING EACH END 3 8"FEMALE N P T F
SUPPLY
Your ARO Self-Feed tad is designed to deliver specific horsepower and thrust to achieve high rates of work
Shown below is the same system in schematic form.
SEE SPECIAL NOTE - PAGE 3 F = FILTER
R = REGULATOR
L = LUBRICATOR
F-R-L- MODEL C28231-810

ARO INSTANT
BASIC REMOTE CONTROL FOR START
AND EMERGENCY RETRACT FUNCTIONS
Remote operation of the unit may be achieved by connecting a 3-way valve to the remote start and/or remote retract ports, as shown above.
TO START - depress the remote button momentarily. The unit will advance the drill to a pre-set depth and automatically retract to the initial position whereupon the
unit will stop.
EMERGENCY RETRACT - depress the emergency button momentarily.
retract immediatley to the initial position whereupon the unit will stop. This signal to the unit will shift the built-in pressure operated valve, commanding the unit to
NOTE: MANUAL START and EMERGENCY RETRACT buttons on the tool are fully operational even when remote control is used. The manually operated buttons
can be used when set-up is required.
Shown below is the same system in schematic form.
SEE SPECIAL NOTE - PAGE 3
PAGE 8 OF 20

(drain) line of compressedair BEFOREperforming maintenance or
service to tool.
PIPE NIPPLE r
ADAPTER 44883
are recommended.
Listedhere are the three basic sections of the tool and instructions
for removingthem from tool. Tofurther disassemble,referto the ap-
propriate section outlined in the following pages.
Securetool in a suitable holding device clamping on the Valve Hous-
ing. CAUTION:DONOTCLAMPon the OUTERSLEEVEof the Piston
and MotorSectionas it maycausedistortionofthe pistonAir Cylinder
(40579-) impairing the function of the tool.
DUAL SPINDLE ATTACHMENT
RemoveCover (40582-)fromtool.ThreadAdjustmentscrew(40292-)
all theway backand pushPistonRodforward to exposeflats on gear
housing. Usingwrenches on flats of gear housing and flats of Adap-
ter (46060), unthreadAdapterfrom gearing and removeDual Spin-
dle Attachment from tool. Seepage 10for complete disassembly of
Dual Spindle Attachment.
GEARINGSECTION
RemoveDual Spindle Attachment as outlined above.ThreadAdjust-
mentScrews(40292-) all the way back and push PistonRodall the
way forward exposingflats of MotorHousingout of the OuterSleeve.
Usingwrenchesonflats of gearhousingand motorhousing,unthread
and remove GearingSection from motor housing - R.H.threads. If
tool has both Driveand Auxiliary Gearing,removeDriveGearingfrom
Auxiliary Gearingusing wrenches on flats of each gear housing. R.H.
threads. See page 12for complete disassembly of gearing.
MOTORANDPISTONSECTION
RemoveGearing from tool as outlined in the Gearing Section. The
MotorAssemblyalong with Spacers(33699) and (33711)can be re-
movedfrom MotorHousingafter removalof the GearingSection.See
page 13for complete motor disassembly. To remove PISTONSEC-
TION:remove cover (40582.), Adapter (44883), Washer (Y14-616)
and Trip Bracket(41713-)from end of PistonRod.PlaceValve Hous-
ing in a suitable holding device with OuterSleevein an upright posi-
tion Usingo straptypewrench on OuterSleeveunthreadand remove
OuterSleevefrom Valve Housing - LEFTHANDTHREADS.NOTE:Mo-
tor Housing, Piston Rod,Piston and components will remain inside
Outer Sleevewhen Outer Sleeve is removed from Valve Housing.
CAUTION:RemoveOuterSleevewith care. Pull OuterSleevestraight
up and away from Valve Housing so as not to bend the Air Cylinder
(40579-), damaging the inside diameter. The Air Cylinder may re-
main attached to the Valve Housing when OuterSleeveis removed.
If this is the case,pull the Air Cylinder straight off the Valve Housing
exercisingcautionsoOSnotto damagetheinsidediameterof Cylinder.
If Cylinder remains inside outer Sleeverefer to page 14for removal
procedure.
VALVESECTION
The Spool Valve, FeedControl Valves and Button BleedValves can
be serviced without removingthe Valve Housingfrom the tool. If the
“0” Rings(Y325-15)contained InsidetheValveHousingshould need
to be replaced follow the disassembly procedurefor the removal of
the PistonSection.The Gearing Section need not be removedfrom
tool to remove Only the Valve Sectlon.Seepage 15for disassembly
of Valve Section.
(SEE TABLE ABOVE)
COVER
VALVE HOUSING
ASSEMBLY
ASSEMBLY
TORQUE PIN 40578
AUXILIARY GEARING
DRIVE GEARING-l
VALVE
MOTOR AND
PISTON
SECTION
GEARING
SECTION
I
FORM 1824-2 PAGE 9 OF 20

DISASSEMBLY AND REASSEMBLY OF TOOLS
DUAL SPINDLE SECTION
DISASSEMBLY REASSEMBLY
TheDual Spindle Attachment can be serviced without removing the
completeassemblyfromtool. Using5 mm hex wrench supplied with
unit, loosenboth adjusting screws (46036)- IMPORTANT:alternate-
ly unthreadAdjusting Screwsapproximately 1/2turn at a time or un-
thread screws simultaneously to prevent damaging the unit.
Pack bearings and coat gearswith a good grade of bearing grease
when assembling. Saturate Oil Reservoirswith a good multigrade
Afterthe Bodyand components have been removedfrom Adapter,
DrivingSpindle(46061)and componentscan be removedfromAdap-
ter. To removeBearing (46038) and/or Gear (46025); remove Re-
taining Ring(37285), pressBearingbackon Spindleto exposeNeedle
Roller(46029) and removeRollerto removeGear.RemoveBearing
from Spindle.
10W/30 oil.
Insert a dummy Adjusting Screw (46036) (or a shaft of same dia.)
thru Adapter side of Bodyto maintain alignment of parts to be as-
sembled into Bodyand assembleNylonWasher(46032) to dummy
screw. Assembleone NeedleCage (46037), Spacer (46034), Nee-
dle Cage(46037) into Gear(46030) and assembleGearto the dum-
myscrew.AssembleNylonWasher(46031) into Body- BendWasher
slightly to insert into Bodyand assembleOil Reservoir(46053) into
Body.
Pushback on head of AdjustingScrew (46063) to compressSpring
Washer(46035) and expose“E” Ring(Y180-31)out of counterbore
of Bodyand remove“E” Ring.RotateSpindle Turretand at the same
time pull back slightly on Turretto locate alignment of Spindle with
notch in Body(46039) and removeSpindle Assemblyfrom Body.To
removeGear(46030) from Body,removeOil Reservoir(46035) and
NylonWasher(46031)- bendwasherslightlyto remove.NeedleCage
(46037), Spacer(46034) and Washer(46032) are loose partsand
will drop out. DONOTdisassemble Spindle (46062)- If necessary
to replace a part, replace as complete Spindle Assembly(46062).
AssembleSpringWasher(46035) and NylonWasher(46032) to Ad-
justing Screw(46036) and assembleAdjustingScrewto SpindleAs-
sembly (46062) and assemble another Nylon Washer (46032) to
AdjustingScrew.AssembletheSpindleAssemblyinto Bodywhile hold-
ing AdjustingScrewin alignmentwith dummyscrewto maintain parts
alignment and using Adjusting screw to pushthe dummy screw out
of Body.NOTE:Align Spindle Assemblywith notch in Bodyto assem-
ble.AfterassemblingSpindleto Body,depressheadofAdjustingScrew
and assemble “E” Ring to Screw securing Screw to Body.
ReassembleDrivingSpindle (46061) and componentsand the Body
(46039) with Spindle Assemblies (46062) to Adapter (46060) in
the reversemanner of disassembly.
RECOMMENDED METHOD FOR HOLDING DRILLS IN SPINDLES
Toproperlyhold drill bit in collet and reducethe chance of slippage,
a flat must be ground on the shank end of the bit. The flat should
be approximately 5/16” (8mm) long and the depth should be 1/3 of
thebitdiameter.NOTE:Ifbitistoo largeto fit into lockinginsert(smaller
capacity DualSpindlesdo not haveinsert), a square mustbeground
onto the shank end of the bit.
Insert bit into spindle and into locking insert (where applicable) in-
suring that one of the set screws locates squarely on the flat of the
bit.Tighten collet firmly, then tighten setscrews.NOTE:DONOTover-
tighten Collet.NOTE:Intent of setscrews is only to keepbit from turn-
ing in collet.
PAGE 10 OF 20

DUAL SPINDLE ATTACHMENT
M106
60
DUAL SPINDLE ATTACHMENT ASSEMBLY 46063
/----- -
FORM 1824-2 PAGE 11OF 20

DISASSEMBLY
GEARING SECTION
DRIVE GEARING
Removegearing from tool as outlined on page 9.
RemoveSpacer (33697-l). Grasp Ring Gear in one hand and tap 33153,or equivalent, upon assembly.Gearingassemblyshould con-
threaded end of Spindle with a softface hammer;Spindle and com- tain approximately 1/4 oz. (7 g) of grease.
ponentswill loosenfrom RingGear.NOTE:Furtherdisassemblyshould AssembleSnap Ringto Spindle. RotateSnap Ring allowing installa-
bedone only if it should be necessaryto replace a part,as Brinelling tion of Shafts. After both Gearsand Shafts have‘been assembled
of the bearing races mayoccur, making replacement necessary.To to Spindle, rotate Snap Ringlocking Shaftsin place. AssembleBear-
disassemble completely, remove Bearing (33706). Turn Snap Ring ing (33706) to Spindle and assembleinto Ring Gear(34490) with
on Spindle so the open portion of the ring will allow the removal of Washer (47590) and WaveWasher(47589). AssembleSeal,Nose
Shaft.RemoveShaft,releasing Gear.Repeatfor removalof opposite Housing and Spacer (33697-1) to gearing.
Shaft and Gear. NOTE:Bearing(33703) isan angularcontacttypebearingandshould
be installed as shown.
REASSEMBLY NOTE:Checkside play of Spindle with tool retracted.If side ploy ex-
ceeds .010TIR,add sufficient number of WavyWashers(47589) to
reduce side play to less than .010 TIR.Do not use less than one or
more than three Wavy Washers.
NOTE:Pock Bearings and lubricate Gears and Shafts with grease
46064 DRIVE GEARING ASS’Y.
(4:l)
BEARING (4) 42271
BEARING 33703
46065 DRIVE GEARING ASS’Y.
47590 WASHER
34490 RING GEAR 7 7
AUXILIARY GEARING
DISASSEMBLY
Removegearing from tool as outlined on page 9. REASSEMBLY
Grasp Ring Gear in one hand and tap drive end of Spindle with a PackBearingsand lubricate gearswith grease(33153) upon assem-
non-metallic hammer;Spindleand componentswill loosenfrom ring bling. GearingAssemblyshould contain approximately 1/4 oz. (7 g)
of grease.
gear.
Gearing should not be disassembled further unless it is necessary
to replace a part as Brinelling of the bearing races may occur mak-
ing replacement necessary
Tofurther disassemble- removeBearing(33704), rotateSnapRing
so the open portion of the ring will allow the removal of Shaft, re-
moveShaftreleasing Gear.Repeatfor removalof oppositeShaft and
Gear.
ToreassembleGearsand Bearingsto Spindle,reversethe procedure
of disassembly.NOTE:after assembling Gearsand Shaftsto Spindle
rotate Snap Ring securing both Shafts in place.
AssembleSpindle and components to Ring Gear.
PAGE12OF20

AUXILIARY GEARING
M 106
60
40826 AUXILIARY GEARING ASS’Y.
(7.43:1) BEARING (4) 1422 7 1
46416 GEAR (2) 40641 SHAFT (2)
33706 (18 TEETH)
RETAINING RING 40840 SPINDLE 33704 BEARING (2)
40643 SNAP RING
35210 RING GEAR
INCLUDES GREASE FITTING 35323
40825 AUXILIARY GEARING ASS’Y.
(4:l) BEARING (4) 42271
46417 GEAR (2) 40641 SHAFT (2)
33706 RETAINING RING 40839 SPINDLE 33704 BEARING (2)
40642 SNAP RING
INCLUDES 35323 ASE FITTING (7 INT- I5 EXT TEETH)
MOTOR
DISASSEMBLY
Remove motor assembly from housing as outlined on page 9. Us-
ing a spanner type wrench, remove nut (33694) and sems fasten-
er (33700). Grasp cylinder in one hand and tap splined end of
rotor with a soft face hammer; motor will come apart.
ASSEMBLY
Assemble bearings into end plates. NOTE: Assemble bearing
(33709) into end plate with identification markings on the bearing
facing “out”. Assemble end plate (33710) to rotor and secure with
sems fastener (33700). NOTE: Torque to28 in. Ibs. Assemble cyl-
inder over rotor, aligning air inlets and roll pin of cylinder with air
inlets and hole in end plate for roll pin. Assemble blades to rotor.
NOTE: Pack bearings with ARO 33153 grease, or equivalent, and
coat i.d. of cylinder with ARO 29665 spindle oil upon assembly.
Assemble end plate (33712) to rotor. Assemble nut (33694) to end
plate and torque to 9 - 12 ft Ibs. Insure rotor does not bind (if rotor
binds, lightly tap splined end of rotor with a soft face hammer to
loosen) and assemble to tool.
m 33705 BEARING Y178.20
33712 END)PLATE 33701 SPACER 33709 BEARING (FLUSH
FACE--INSTALL WITH FLUSH
FACE TOWARDS END PLATE)
RET NUT 33694
TORQUE
TO 9-12 FT LBS
00 SEMS FASTENER 0
*INCLUDED WITH 35679 CYLINDER 41577 MOTOR ASS'Y
* NOT INCLUDED WITH MOTOR ASS’Y
0 TORQUE TO 28 IN. LBS
FORM 1824-2 PARTS MARKED THUS x ARE INCLUDED IN SERVICE KIT NO 41327. SEE PAGE 18 PAGE 13 OF 2

AIR PISTON
DISASSEMBLY
Removemotor and PistonSection from tool OSoutlined on page 9.
lftheAirCylinderhasremainedinsidethe OuterSleeve,pushthe Piston
Rodforword then pull it rearward to removethe Air Cylinder. CAU-
TION:Handle the Air Cylinder carefully so as not to damage the in-
sidediameter.RemoveRetainingRing(Y145-23)from the PistonRod.
Pushthe PistonRodand MotorHousing out thru gear end of the Out-
er Sleeveand removefrom Outer Sleeve.Piston (40576) will drop
out of OuterSleevewhen Piston Rod is removed. Using a suitable
rod,insert rodthru gear end of OuterSleeveand PushCap (40577)
out thru valve end of OuterSleeve.PistonRodand MotorHousingare
locked together with a hard drying thread adhesive at assembly. If
it should becomenecessaryto disassembletheseparts,heatthreaded
area lightly to facilitate removal-R.H. thread.
REASSEMBLY
NOTE:Whenevera partcontaining “0” Ringshas beenremovedfrom
tool it is recommendedthatthe “0” Ringsbereplacedwith new ones
when reassemblingportto tool. Lubricateall “0” Ringswith “0” Ring
lubricant when assembling.
AssembleRetaining Ring(Y147-212)into Sleeve,if removed.Assem-
ble “0” Rings(Y325-214)and (Y325-225) to Cap (40577) and as-
sembleCapintoSleevethruvalveend.Applya small amountof grease
to Torque Pinto retain pin in place and assemble into OuterSleeve
in hole provided.Assemble “0” Ring (Y325-16)to groove in Piston
Rodand assemble“0” Ring(Y325-225) to groovein MotorHousing
AssemblePistonRodand MotorHousinginto OuterSleevefrom gear
end,exercising careso as notto damage “0” Ring(Y325-214)when
inserting PistonRodthru cap already assembledinto Sleeve.Slot in
Motor Housingmust be aligned with TorquePin.Assemble“0” Ring
(Y325-224) and Back-up Rings (41981)to Piston (40576) and as-
semblePistonoverPistonRod.Securewith RetainingRing(Y145-23).
Clamp Valve Housing in a suitable holding device with sleeve end
upright. Assuming “0” Rings have been assembledto Valve Hous-
ing; coat I.D.of Air Cylinder (40579-) with “0” Ring lubricant and
place Air Cylinder on Valve Housing over “0” Ring (Y325-32). As-
semble Motorand Pistonsection with OuterSleeveto Valve Housing
and overAir Cylinder, exercising care to maintain proper alignment
so OSnot to damage I.D.of Air Cylinder and thread OuterSleeveto
Valve Housing.Tighten securely using a strap type wrench. Assem-
ble Motor, Gearing and Trip Bracket to tool.
NOT SHOWN
40578 TORQUE PIN
40302 NAMEPLATE (NON-EU MODELS)
40302-EU NAMEPLATE (-EU MODELS)
MODELS
8268-A( j-1
8268-A( )-3
PISTON
ROD
40596
40575
AIR MOTOR OUTER
CYLINDER HOUSING SLEEVE
40679-1
40574
40595
40579 40573
-- O-RING Y325-225 q
MOTOR HOUSING*
THREADGUARD 40581 CUTER SLEEVE*
l SEE TABLE FOR PART NUMBER
RETAINING RING 1147-2121
"O" RING Y325-214 [XI
“O" RING Y325-225 q
BACK-UP RING (2) 41981 [XI
PARTS MARKED THUS # ARE INCLUDED IN SERVICE KIT NO 41327, SEE PAGE 18
PAGE 14 OF 20

VALVE SECTION M106
DISASSEMBLY
60
SPOOLVALVE: Remove two (2) cops (46697) with “0” Rings
(Y325-14).SpoolValvecan now be pushedout thru housing. Handle tool it is recommendedthat the “0” Ringsbereplacedwith newones
Spool Valve with reasonable core so as not to damage outside di- when reassemblingpartto tool. Lubricateall “0” Ringswith “0” Ring
ameter of valve. lubricant when assembling.
FEEDCONTROLVALVES:Removescrews(Y211-1)and plate(48440-1)
Unthread valves from housing to remove.
SPOOLVALVE:Assemblefive (5) “0” Rings (41083) to Valve Body
(40307) and assembleValveBodyinto housing.Assemble“0” Rings
(Y325-14)to Cops and assemble Capsto housing
CHECKVALVES(39587): Valve Housing must be removedfrom tool
to service check valves. Unthread and removeScrew Plugs to gain FEEDCONTROLVALVES:Assemble“0” ring (Y325-7)to needlevalve
access to Check Valves and components. (48441-1)and assemble needle valve to housing. Assemble plate (48440-1) to housing, securing with screws (Y211-1).
BUTTONBLEEDVALVESneednot be removedexceptfor replacement
only. CHECKVALVES:Assemble “0” Ring (Y325-2) to Check Valve and assemble Check Valve and Spring (35733) to housing. Securethe
REASSEMBLY
one CheckValveand Springwith ScrewPlug(39652) - seeillustra-
tion for correct one. Assemble “0” Ring (Y325-3) to Screw Plug
NOTE:Whenevera partcontaining “0” Ringshas beenremovedfrom (38863) and assembleto housingsecuringCheckValveand Spring- see illustration.
SEAL 40593 INCLUDED
WITH 8 BONDED TO
VALVE HOUSlNG 40572
* ASSEMBLE WITH THREAD ADHESIVE SUCH AS LOCTITE 242
CAPSCREW(2) Y211-1
PLATE48440-1
NEEDLEVALVE(2) 48441-1
“0” RING(2) Y325-7 q
SCREW PLUG 39652
q SPRING (2) 357
CHECK VALVE (2) 395
q *O”RING (2) Y325-
q ‘O” RING (5) 41083
VALVE BODY 40307
PIPE PLUG (2) Y227-2-L
VALVE HOUSING 40572
”O” RING (2) Y325-I4
q "O" RING Y325-32
NOT INCLUDED
HOUSINGASSEMBLY40815
PARTS MARKED THUS X ARE INCLUDED IN SERVICE KIT NO 41327. SEE PAGE 18
FORM 1824-2 PAGE 15 OF 20

OPTIONAL COLLETS
PART
NO
46033-1
46033-2
46033-3
46033-4
46033-5
46033-6
46033-7
46033-8
46033-9
46033-10
46033-11
46033-12
46033-13
46033-14
46033-15
46033-16
46033-17
46033-18
46033-19
46033-20
46033-21
46033-22
46033
46033-24
4633-25
46033-26
46033-27
46033-28
46033-29
46033-30
46033-31
46033-32
46033-33
46033-34
46033-35
46033-36
46033-37
46033-38
BORE
DIA.
(REF)
.083
087
.091
.094
.098
102
106
110
.114
118
.122
.126
.130
.134
.138
.142
.146
.150
.154
157
161
.165
.169
.173
.177
.181
.185
.189
.193
.197
.201
.205
.209
.213
.216
.220
.224
INCH
5/64
3/32
7/64
1/8
9/64
5/32
11/64
3/16
13/64
7/32
ACCEPTS
DRILL SIZES mm
NO
47
45
44
43
42
40
38
36
35
33
32
31
2.0
21
22
23
24
25
26
27
28
2.9
30
31
32
3.3
34
3.5
3.6
37
38
39
4.0
4.1
4.2
4.3
44
4.5
4.6
4.7
4.8
4.9
5.0
51
5.2
5.3
54
5.5
5.6
5.7
-
30
29
-
28
26
25
23
22
20
19
18
17
16
14
13
12
10
9
7
5
4
3
-2
-
PART
NO
46033.39
46033.40
46033.41
46033.42
46033.43
46033.44
46033-45
46033.46
46033.47
46033.48
46033.49
46033-50
46033.51
46033-52
46033-53
46033.54
46033-55
46033-56
46033-57
46033.58
46033.59
46033.60
46033.61
46033.62
46033.63
46033.64
46033.65
46033-66
46033.67
46033.68
46033-69
46033.70
46033-71
46033-72
46033-73
46033.74
46033-75
46033-76
BORE
DIA
(REF.)
228
232
236
.240
244
248
252
256
260
264
.268
272
276
280
.283
.287
291
295
299
303
.307
.311
315
319
323
327
331
.335
.339
.342
.346
.350
.354
.358
.362
.366
370
375
INCH
15/64
1/4
17/64
9/32
19/64
5/16
21/64
1l/32
23/64
3/8
ACCEPTS
DRILL SIZES
NO
1
-
A
B
C
D
E
F
G
-
H
I
J
K
-
-
L
M
-
N
-
0
-
P
0
-
R
-
-
S
r
-
-
U
-
mm
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
9.3
94
95
ACCESSORIES
5/16(8mm)+
1/2(13mm)
.750 (19mm)
I
DEPTH
40589 FLANGE MOUNT ASS’Y.
PAGE16OF20

ACCESSORIES
43589 EXHAUST MANIFOLD ASSEMBLY
INCLUDESMANIFOLD43586, O-RING(2) Y325-230 AND SET
SCREW Y23-103.
For external muffling use with Muffler (43874-1).
Forclosed exhaust system use with HoseAdopter (22827) for 1/2”
I.D. exhaust hose.
TOASSEMBLETOTOOL:RemoveThread Guard (40581) from nose
end of Outer Sleeve and slip Manifold (43586)-with “0” Rings
(Y325-230)- over OuterSleeveand position over exhaust holes in
sleeve.Outletfor muffler can be positioned either to the front or the
rear as desired.Tighten SetScrew (Y23-103) securing manifold to
OuterSleeve.CAUTION:DONOTOVER-TIGHTENSetScrew(Y23-103)
asit maycausedistortionofthe OuterSleeveand thus causedamage
to the Air Cylinder (40579-) contained inside the OuterSleeve im-
pairing the function of the tool.
SERVICE KIT NO. 41327
FORSERVICINGMODELS8268-()
CONSISTING OF:
QTY
1
1
1
1
2
1
5
1
2
2
5
2
PART
NO. DESCRIPTION QTY
37774 Seal
Y325-16 O-Ring
Y325-224 O-Ring
Y325-214 O-Ring
Y325-225 0-Ring
33709 Bearing
41520 Blades
33705 Bearing
41981 Backup Ring
40309 Gasket
41083 O-Ring
Y325-7 O-Ring
PART
NO.
1 Y325-3
2 35733
1 40593
3 Y325-210
1 Y325-32
1 Y325-226
2 Y325-14
2 Y325-2
1 41795
1 41799
1 41954
DESCRIPTION
O-Ring
Spring
Seal
O-Ring
O-Ring
O-Ring
O-Ring
O-Ring
Motor Oil
Gear Lube
O-RingLube
PAGE 18 OF 20

TROUBLESHOOTING
M 106
60
LISTED BELOW ARE SOME OF THE MOST COMMON CAUSES FOR THE SELF-FEED DRILL TO MALFUNCTION. MALFUNCTIONS BEYOND
THE SCOPE OF THIS MANUAL SHOULD BE BROUGHT TO THE ATTENTION OF YOUR ARO REPRESENTATIVE OR RETURN THE TOOL
TO FACTORY FOR REPAIR.
CONDITION
FAILURE TO
FEED OR
IRREGULAR OR
ERRATIC FEED.
LOW SPEED OR
MOTOR FAILS TO
OPERATE.
MOTOR CONTINUES
TO RUN AFTER
RETRACTION.
FAILURE TO
RETRACT.
POSSIBLE CAUSE
1. INADEQUATE AIR
SUPPLY.
2. FEED CONTROL
VALVES IMPROPERLY
ADJUSTED.
3. AIR LEAK AROUND
CAP 46697
4. DIRT OR DAMAGED
“0” RINGS ON SPOOL
VALVE 40307
5. CLOGGED AIR PASSAGE
IN VALVE HOUSING.
1. INADEQUATE AIR
SUPPLY.
2. CLOGGED AIR
PASSAGE IN VALVE
HOUSING.
1. PISTON NOT FULLY
RETRACTED.
2. DAMAGED “0” RING
Y325-210 INSIDE VALVE
HOUSING.
1. IMPROPER ADJUSTMENT
OR ALIGNMENT BETWEEN
ADJUSTMENT SCREW
AND BUTTON BLEED VALVE.
2. FEED CONTROL VALVES
48441-1 IMPROPERLY
ADJUSTED OR DIRTY.
3. AIR LEAK AROUND
CAP 46697
4. DAMAGED “0” RINGS
IN MUFFLER CAP,
VALVE HOUSING OR
SPOOL VALVE OR SEALS
ON PISTON.
5. CLOGGED AIR PASSAGE
IN VALVE HOUSING.
CORRECTIVE ACTION
1. CHECK AIR SUPPLY FOR CORRECT REGULATOR AD-
JUSTMENT 190 P.S.I.G. MAX. WHEN TOOL IS
OPERATING).
2. REFER TO SET-UP PROCEDURE PAGE 4.
3. CHECK FOR DAMAGE TO “0” RING. CHECK AND INSURE
CAPS ARE PROPERLY TIGHTENED.
4. REFER TO VALVE SECTION PAGE 15 AND REMOVE
SPOOL VALVE. INSPECT. CLEAN, REPLACE “0” RINGS.
5. REMOVE VALVE HOUSING FROM TOOL. DISASSEMBLE,
BLOW ALL AIR PASSAGES CLEAR OF DEBRIS.
1. CHECK AIR SUPPLY FOR CORRECT REGULATOR AD-
JUSTMENT.
2. REMOVE VALVE HOUSING FROM TOOL. DISASSEMBLE,
BLOW AIR PASSAGES CLEAR OF DEBRIS.
1. INSURE PISTON IS NOT OBSTRUCTED AND IS
RETURNED ALL THE WAY BACK.
2. REMOVE VALVE HOUSING FROM TOOL. REPLACE “0”
RINGS.
1.
2.
3.
4.
5.
REFER TO SET-UP PROCEDURE PAGE 4.
CHECK ADJUSTMENT, REFER TO PAGE 4. REMOVE, IN-
SPECT, CLEAN.
CHECK FOR DAMAGE TO “0” RING. CHECK AND INSURE
CAPS ARE PROPERLY TIGHTENED.
DISASSEMBLE, INSPECT, REPLACE “0” RINGS AND/OR
SEALS.
REMOVE VALVE HOUSING FROM TOOL. DISASSEMBLE,
BLOW AIR PASSAGES CLEAR OF DEBRIS.
FORM 1824-2 PAGE 19 OF 20

“A” (MAX) DOUBLE REDUCTION
REMOTE CONTROL PORTS 1/8-27NPT.F
F-FORWARD
R-RETURN
FEED RATE
ADJUSTENT VALVE
r
BUTTON
MODEL 8268-A{ )-1
INCHES 25-3/4 23-31/32 10-1/4 8-7/16 9-3/8 2-3/32 2-9/32
&Fs--------320635: 6g 64 64 I9 I3 I83 41 ;*g g5” 95 I9 19 13
2.31/32 2-15/16 2.,9,32
-__--~ -.
mm 654 609 260 215 237 53 57
FRONT VIEW
MODEL 8268-A( )-3