Ingersoll-Rand 8246-D User Manual

OPERATOR’S MANUAL

INCLUDING: OPERATION, INSTALLATION & MAINTENANCE

Tool Products

IMPORTANT: READ THIS MANUAL CAREFULLY BEFORE INSTALLING,

OPERATING PRECAUTIONS RECOMMENDED LUBRICANTS

l

Keep hands and clothing away from rotating end of tool.

l

Wear suitable eye protection while operating tool.

0 Disconnect air supply from tool before removing/installing bit

or performing other maintenance procedures.

ROUTINE LUBRICATION REQUIREMENTS

Lack of or an excessive amount of lubrication will affect the perfor­mance and life of this tool. Use only recommended lubricants at
below time intervals:

EVERY 8 HOURS OF TOOL OPERATION

voir of recommended F.R.L. with spindle oil (29665).

EVERY 160 HOURS OF TOOL OPERATION

“EP” grease (33153), 1 to 2 strokes, thru grease fitting in gear
housing. NOTE: Spindle must be extended from outer sleeve suf­ficiently to expose grease fitting in gear housing. Gearing should
contain approximately 1/8 oz. (3.5 g) of grease.

AIR SUPPLY REQUIREMENTS

For maximum operating efficiency, the following air supply specifi-

cations should be maintained to this air tool:

l

AIR PRESSURE - 90 PSIG (6 bar)

l

AIR FILTRATION - 50 micron

. LUBRICATED AIR SUPPLY

l

HOSE SIZE - 5/16” (8 mm) I.D.

An ARO® model C28231-810 air line FILTER/REGULATOR/LU­BRICATOR (F.R.L.) is recommended to maintain the above air
supply specifications.

The nose end of the outer sleeve (41) is provided with 1-7/16” -

18 L.H. threads [remove thread guard (47) for use] and a 1-7/16” x
1/2” long pilot diameter for fixture mounting. Foot and flange type

mounting brackets are available for tool mounting.

BANT-A-MATIC® SELF-FEED DRILLS

Models 8246-D( )-( )

OPERATING OR SERVICING THIS EQUIPMENT.

- Fill lubricator reser-

- Inject NLGI #1

MOUNTING

SECTION

MANUAL

M104

13

Released: 4-1-88
Revised: 12-l 2-94

Form:

After disassembly is complete, 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 29665

“O” Rings & Lip Seals 36460

Gears and Bearings

ARO Part #

Description

1 qt. Spindle Oil

4 oz. Stringy Lubricant

33153 5 lb. “EP” - NLGI #1 Grease

3266-2

SET-UP PROCEDURE

WARNING: Keep clear of rotating end of unit with hands and/or
clothing. Keep fingers/hands from being pinched between hous­ing or valves and adjustment screws and/or trip bracket.

l

Loosen two screws (29) and remove cover (1).

0

Allow a minimum distance of 1/4” between the tap point of the

unit and the workpiece. This is necessary for the air motor to
start and reach free speed before the tap point touches the
workpiece.

l

Determine the TOTAL STROKE LENGTH the tap must travel
to perform the tapping operation -see illustration below.

a

Loosen jam nut (8) and turn adjustment screw “A” so the dis­tance between the end of the screw and the stud (26) equals

the total stroke length.

l

Tighten jam nut (8).

0

Loosen jam nut (8) and turn adjustment screw “B” (valve in­head models only) so the distance between the end of the
screw and the button bleed valve (25) is slightly GREATER
than the distance set for adjustment screw “A”.

l

Start and let the unit advance until the adjustment screw “A”
makes contact with the stud (26).

l

Carefully, and be aware that the unit is going to retract, turn the
adjustment screw “B” until it depresses the button bleed valve
(25) enough to cause the unit to retract.

l

Tighten jam nut (8).

0

See “FEED RATE CONTROL VALVES”, page 2.

TOTAL STROKE LENGTH

I
I

1/4”MlNlMUM

-DESIRED TAP
PENETRATION

ADJUSTMENT SCREW “A”

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

1725 U.S. No. 1 North l P.O. Box 8000 l Southern Pines, NC 28388-8000

©1994 THE ARO CORPORATION. PRlNTED IN U.S.A.

PROFESSIONALTOOLS

FEED RATE CONTROL VALVES

REMOTE OPERATION

l Turn valve (23), marked “R” on top of housing, approximately 1-1/2

turns counterclockwise (open).

l Turn the other valve (23), marked “F” on top of housing, clock-

wise until closed (do not tighten too snugly)

l Start unit and slowly turn valve (23) marked “F” counterclockwise

(open) until the desired forward rate of feed IS reached.

l A final adjustment of the rate of return (retract) can be made with

the valve (23) marked “R” on housing.

MANUAL OPERATION

l Install button bleed valve (25) in either the “F” port located at top

of valve housing or the “F” port located at the rear of valve housing.
NOTE: Unused port must be plugged with pipe plug (24).

l Depress button bleed valve (25) marked “F” on valve housing.

The unit will start in the forward (advancing) mode and continue
to feed forward until the adjusting screw “B” has depressed bleed
valve (25) marked “R” to retract the unit. See set-up procedure.

l A manual emergency retract button bleed valve (25) can be in-

stalled in “R” port at top of valve housing if desired. This valve
can be used to immediately retract the unit in case of misaligned

part or other emergency. Valve not furnished.

RECOMMENDED POWER AIR INLET SYSTEM

Install a pressure bleed valve - ARO part number 9600 - in valve

port marked “F” at either the top or rear of valve housing
Connect pressure bleed valve - using 1/8” i.d. tubing - to a re­mote operated valve which, when actuated, feeds air pressure
to the pressure bleed valve. Pressure bleed valve will bleed the
air from “F” port of valve housing causing spool

valve

in housing
to shift to the forward feed position thus starting the forward stroke
of the unit.
Install a pressure bleed valve

-ARO

part number 9600- in valve
port marked “R” at the top of the valve housing and connect ­using 1/8” i.d. tubing- to 0 remote MANUALLY operated valve. This
valve is used as an emergency retract in case of o part misalign­ment or such only as the unit, when properly set-up and applied,
will automatically retract and return to the start position. See set­up procedure.
Refer to page 3 for plumbing and schematic diagrams.

SPECIAL NOTE: The air inlet and remote ports of valve housing have
tapered pipe threads and should not require the use of thread sealants,
such as sealant tape or pipe joint compounds. Thread sealants, when
used improperly, can contaminate air passages and cause valve or
unit to malfunction.

Your ARO Self-feed tool is designed to deliver specific horsepower and thrust to achieve high rates at work. To assure the unit will develop this power, core
the power air inlet system is correctly sized to permit the proper rate of air flow. Shown is o system for a single tool Mot will supply correct delivery. IMPORTANT
rated when 90 P.S.I. is present AT THE TOOL DURING OPERATION.

Shown below is the some system In schematic form.

F = FILTER
R = REGULATOR
L = LUBRICATOR

F-R-L- MODEL C28221-810

If two or three

units

are to be installed, each unit should be supplied with a system like that shown below or use system like that above for each tool.

FILTER MODEL F25231-110
REGULATOR MODEL R27231-100
LUBRICATOR MODEL L26221-110

must be token that

- the tool Is power

2

SET-UP PROCEDURE WITH OPTIONAL

HYDRAULIC CHECK

M104

13

Assemble hydraulic check to mounting bracket and assemble

mounting bracket to tool using washers (Y14-8) and cap screws
Measure distance from tap point to work piece - distance “Y”.

Distance “X” between hydraulic check plunger and trip bracket
must be less than distance “Y” to prevent damage to tap point
when it approaches the work piece.
Loosen the cap screws (Y154-48) and position hydraulic check

to obtain correct setting for distance “X”.
Tighten cap screws (Y154-48) securely before operating unit,

Increase the air flow thru the Feed Control Valve marked “F” by

Y

opening two (2) full turns from closed position, This will allow tap
to advance rapidly until the trip bracket contacts plunger of hydraul-

ic check.

l

The Hydraulic Feed Rate Adjustment is located at the nameplate
end of the Hydraulic Check. Rotate extended spindle until the slot
on the spindle is located midway between the highest and the
lowest settings.

l

Start tap unit and the tap will advance at a rapid rate until the
trip bracket contacts plunger of hydraulic check,

l

Slowly rotate the Hydraulic Feed Rate counterclockwise for faster
feed rate or clockwise for slower feed rate.

ADJUSTMENT SCREW

BASIC REMOTE CONTROL FOR START

AND EMERGENCY RETRACT FUNCTIONS

3-WAY PALM BUTTON VALVE MODEL
461-3 WITH GUARD 20975 (RECESSED

GREEN BUTTON). INSTANT TUBE CONNECTIONS

“OUT” PORT

. PACKAGED 10 TO A BOX

REMOTE OPERATION

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 preset depth and automatically retract to the initial position whereupon the unit will stop.
EMERGENCY RETRACT - depress the emergency button momentarily. This signal to the unit will shift the built-in pressure operated valve, commanding the unit to retract immediately

to the initial position whereupon the unit will stop.
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 some system in schematic form.

AND SPRING RETURN

3-WAY PALM BUTTON VALVE (MODEL 461-2).
RED BUTTON WITHOUT GUARD. INSTANT TUBE
CONNECTIONS AND SPRING RETURN

37601 TORQUE ARM ASS’Y

'37625

42920
42921

42135
44790
44797
42141
42145
42143
42144
42142
42599
42130

44804
44798
44802
44791
44795
44799
44801

44800

44794

1

HOUSING
CLUTCH SPRING, SMALL (3)
CLUTCH SPRING, LARGE (3)

CLUTCH ADJUSTMENT CAP

SPRING
CLUTCH SLEEVE
SPRING CUP DRIVER
CLUTCH DRIVER

CLUTCH PLATE
CLUTCH PLATE
CLUTCH PLATE
DRIVE PINS (3)
BEARING

SLEEVE BUSHING
REVERSING DRIVER
SPACER
GEAR CARRIER BEARING
SPRING
RING GEAR

PIN (3)
REVERSING SLEEVE
GEAR WASHER

RETAINING RING
THRUST WASHER
STOP ARM

RETAINING RING
SPRING
NUT
SPINDLE
GEAR CARRIER
KEY
SCREW (2)
JAW
COLLET
CHUCK NUT

INCLUDED WITH 42124-1 HOUSING

42123-1 TAPMATIC ATTACHMENT AND TORQUE ARM ASS’Y

-SHOWN
WRENCH

40491 SPANNER WRENCH
Y106-1

WRENCH

ALLEN WRENCH

DISASSEMBLY/ASSEMBLY INSTRUCTIONS

M104

13

l Never apply excessive pressure by a holding device which may

cause distortion of a part.

l Apply pressure evenly to parts which have a press fit.
l Apply even pressure to the bearing race that will be press fitted

to the mating part.

l Use correct tools and fixtures when servicing this tool.
l Don’t damage “O” rings when servicing tool.
l Use only genuine ARO replacement parts for this tool. When or-

dering, specify part number, description, tool model number and
serial number.

TAPPER DISASSEMBLY

-Remove stop ring (37625).

-Loosen set screw (42920) and remove clutch adjustment cap
(42125), releasing spring plate (42126). Clutch springs (42133 and

42134) con now be removed.

-Remove chuck nut (40490), collet (37431-2), screw (38034) and
jaw (40488).

-Remove nut (37635), spring (37632), retaining ring (42140) and
stop arm (42138).

-Remove retaining ring (44792) and gear washer (44793).

-Remove spindle (40486) with reversing sleeve (44794).

-Remove spacer (44802).

-Remove clutch sleeve (44790), clutch driver (42141), clutch plates
(42143, 42144 and 42142) and clutch disc (42145).

-Remove spring cup driver (44797) and spring (42135).

-To disassemble spindle components, remove drive pins (42599)
and press spindle (40486) out of reversing sleeve (44794).

TAPPER ASSEMBLY

-Tapping units are packed with grease and only need periodic ad-

ditions to maintain proper lubrication. It is suggested that after
approximately 600 hours of operation, a small amount (1/4 to 3/4
oz. - 7 to 21 g.) of grease 33153 be added. This unit must be dis­assembled to apply grease. An excessive amount of lubricant will
create internal frictlon and overheating.

-Thoroughly clean and lubricate all parts requiring lubrication. Do
not get clutch parts wet or oily.

-Assemble clutch plate (42142) on clutch sleeve (44790) with bear­ing (42130).

-Assemble clutch disc (42145), clutch plate (42144), Clutch disc
(42145), clutch plate (42143) and clutch disc (42145) to clutch
sleeve (44790).

-Line up clutch dogs and assemble to clutch driver (42141).

-Assemble spring (42135) and spring cup driver (44797) into hous­ing, and assemble clutch driver (42141) with clutch plates and
clutch sleeve (44790) into housing, insuring that notches in Clutch
driver align with driver pins (42127) in housing.

-Assemble spacer (44802) to housing.

-Press spindle (40486) into reversing sleeve (44794).

-Assemble three drive pins (42599) to spindle and assemble into
housing.

-Assemble gear washer (44793) to housing, securing with retain­ing ring (44792).

-Assemble spring (37632) into spindle (40486) and secure with
nut (37635).

-Assemble jaw (40488) to spindle, securing with screw (38034).

-Assemble collet (37431-2) to spindle, securing with chuck nut
(40490).

-Assemble clutch springs (42134 and 42133), spring plate (42126),
clutch adjusting cap (42125) and stop ring (37625) to housing.

-Assemble stop arm (42138) to tapper, securing with retaining ring
(42140).

-

42123-1 TAPMATIC ATTACHMENT & TORQUE ARM ASS’Y

OPERATOR INSTRUCTIONS

It is extremely IMPORTANT that a short arm (such as furnished) be employed with the tapping attachment to assure the best performance
of the planetary gear reversing mechanism.
Before installing the tapping attachment, thoroughly clean the machine spindle. Insert the desired tap into the tap chuck of the attachment
so the back jaws will engage the square of the tap. Tighten chuck nut first, then tighten back jaws. This will assure true running of the tap.
The tapping attachment incorporates a spring loaded clutch. Driving torque adjustment is made by tightening or loosening the knurled clutch
adjusting cap (42125). When the desired torque has been determined, the cap may be locked in place by tightening set screw (42920).
The proper clutch adjusting procedure, when beginning tapping operation, is to loosen adjusting cap until all graduations on housing are
visible, then tighten cap progressively until the unit will drive a sharp tap. If a clattering noise is heard during the tapping cycle, it means
that the rollers in the units drive spindle have reached a neutral position and are seeking engagement with either the driving or reversing
splines. NEVER permit this clattering to occur, as it will adversely effect the life of the attachment. The correct method of operation is to ad­vance the machine spindle firmly to where the tap enters the hole, the tap then begins to feed itself into the work piece, follow behind with
the machine spindle until the desired depth is reached. Lead pressure is not required with this attachment.
The free axial float in the attachment will automatically allow the top to follow its own lead. A SHORT, QUICK, reaction movement of the
machine spindle will instantly reverse the top at any time. The tap will return to a right-handed rotation OS soon OS it is withdrown from the
hole. During reversal, retract the machine spindle ahead of the lead of the top but not to the point where you ore pulling against the tap
itself. The spring loaded clutch will slip when the top reaches bottom in blind hole tapping. If the clutch slips before the top reaches the
desired depth, it is evident that the tap is dull and should be replaced immediately with a sharp tap. THE CLUTCH SHOULD NOT BE TIGHTENED
FURTHER. When the clutch releases, a buzzing sound is produced - this is not detrimental to the unit.

5

Ml04

13

+ ASSEMBLE WITH THREAD ADHESIVE SUCH AS LOCTITE 242

MODEL

NUMBER

8246-D5-2( ) 550 33654-2 36287 39478 38.6:1

8246-D8-2( ) 900 34746-2 36017 39478 23.3:1

MODELS WITH -EU SUFFIX ARE “EC” COMPLIANT MODELS.

8

R.P.M.

MOTOR AUXILIARY

ASSEMBLY GEARING GEARING RED.

DRIVE

TOTAL

DISASSEMBLY/ASSEMBLY INSTRUCTIONS

GEARING DISASSEMBLY

-Remove tapper attachment from tool.

-Thread adjustment screws (6) and (7) all the way bock and push
the piston rod (48) all the way forward to expose wrench flats
of motor housing (51) from the outer sleeve (41).

- Using wrenches on flats of ring gear and motor housing, unthread
gearing from motor housing.

_ Unthread ring gear (83) from ring gear (81 or 88).

- Grasp ring gear in one hand and tap the threaded end of the spin­dle with a soft faced hammer; spindle and components will loos­en from ring gear.

- Remove bearing(s) and shafts from spindle to remove planet gears.

- To remove bearings (84) from ring gear, remove lock nut (86).

GEARING ASSEMBLY

-Assemble gears to spindle and secure with shafts.

-Align notch at end of shaft with step on spindle (align notch of
shaft with spacer (72 or 80) for auxiliary gearing).

-Pack bearing (70) with ARO 33153 grease and assemble to
spindle.

-Lubricate gears of spindle liberally with ARO 33153 grease and
assemble spindle to ring gear.

-Pack bearings (84) with ARO 33153 grease and assemble to spin­dle with the unmarked faces of bearing facing each other (iden­tification markings on bearing facing out).

-Assemble seal (87) to lock nut (86) and secure bearings (84)
with lock nut.

-Assemble spindle nut (85) to spindle (drive gearing only),

-Assemble gearing to tool.

-Assemble tapper attachment to tool.

MOTOR DISASSEMBLY

-Remove gearing from tool as previously outlined.

-Remove spacers (69 and 68) and motor assembly from housing.

-Remove cap (52) and shield (53).

-Grasp cylinder in one hand and top splined end of rotor (58) with
a soft faced hammer; motor will come apart

MOTOR ASSEMBLY

-Pack open bearings with ARO 33153 grease.

-Assemble bearing (56) to end plate (55).

-Assemble end plate (55) to rotor.

-Coot i.d. of cylinder (62 or 63) with spindle oil 29665 and assem-

ble cylinder to end plate (55) aligning air inlet slot of cylinder and
end plate.

-Coot rotor blades (59) with spindle oil 29665 and insert into rotor

slots (straight side out).

-Assemble bearing to front end plate and assemble end plate to

rotor and cylinder.

-Be sure rotor does not bind (if rotor binds, tap splined end of rotor

lightly to loosen).

-Assemble shield (53) and cop (52) to end plate (55).

-Assemble motor and spacers (68 and 69) to motor houslng.

-Assemble gearing to tool.

AIR PISTON DISASSEMBLY

-Remove gearing and motor assembly OS outlined

-Remove cover (1), adapter (3), washer (4) and trip bracket (5).

-Place valve housing in o suitable holding device with the outer

sleeve (41) in on upright position.

- Using a

-Handle the air cylinder (35) with core so its fine cylindrical shape

- If the air cylinder remains inside the outer sleeve when sleeve is

Strap

wrench on outer sleeve (41), unthread (L.H. threads)
and CAUTIOUSLY remove outer sleeve straight up and off from
valve housing to prevent bending of air cylinder (35) and damag­ing the inside diameter.

is not distorted in any manner.
removed, push the piston rod (48) forward then pull it backward

The cylinder will then extend from the sleeve and con now be

removed.

M104

rod are removed from outer sleeve.

- Insert a suitable rod thru gear end of outer sleeve and push muf­fler cap (38) out thru valve end of outer sleeve.

-Piston rod (48) and motor housing (51) ore secured with a hard
drying thread adhesive. If it should become necessary to separate

these two parts, heat the threaded area lightly to soften the adhe­sive and unthread the rod from the housing (R.H. threads).

13

AIR PISTON ASSEMBLY

NOTICE: When a part containing “O” rings has been removed from

tool, it is recommended that the “O” rings be replaced with new ones

when reassembling port to the tool. Lubricate all “O” rings with ARO
36460 “0” ring lubricant.

-Assemble retaining ring (36), “O” ring (37), “O” ring (39) and

screen (40) to muffler cap (38).

-Assemble muffler cap (38), screened end first, to outer sleeve (41)

from end of sleeve with internal threads. Push muffler cop into
sleeve until it bottoms against step in sleeve.

-Coat torque pin (42) with grease to retain pin in place and as-

semble inside outer sleeve in hole provided.

-Assemble “O” ring (50) to piston rod.

-Assemble motor housing and piston rod to outer sleeve thru end

of sleeve with external threads and push piston rod thru muffler
cap, using care not to damage “O” ring (37) contained in muffler
cap. Align slot in motor housing with torque pin (42).

-Assemble seals (34) to piston (33),with lips of seals facing away

from each other.

-Assemble piston (33) to piston rod (48) and push piston on rod

until it seats against “O” ring (50) and step on rod.

-Assemble retaining ring (49) to groove in piston rod, securing piston

on rod.

-Assemble bearing race (32) and “O” ring (31) to piston rod and
slide them on rod until they seat against retaining ring (49).

-Clamp valve housing (10) in a suitable holding device with the

threaded end of housing upright.

-Coat i.d. of air cylinder (35) with “O” ring lubricant 36460 and

place air cylinder on valve housing (10) over “O” ring (28).

-Using care not to damage “O” rings (11) contained in housing,

insert piston rod (48) thru housing and carefully locate outer sleeve
over air cylinder and thread sleeve to housing. Tighten securely
using a strap wrench.

-Assemble motor, gearing, trip bracket and components and as-

semble cover (1) to housing.

VALVE HOUSING DISASSEMBLY

The valve body (14), feed control valves (23) and button bleed valves
(25) can be serviced without removing outer sleeve from valve hous­ing. To gain access to check valves (17) and components or “O” rings
(11), follow disassembly procedure for removing the air piston.

-Remove both caps (12) and “O” rings (13).

-Push valve body (14) out thru housing. Handle valve body with

reasonable core so the o.d. of valve is not damaged.

-Button bleed valves (25) need not be removed except for

replacement.

VALVE HOUSING ASSEMBLY

-Replace all “O” rings with new ones.

-Lubricate “O” ring (15) with 36460 lubricant and assemble to valve
body.
Assemble “O” rings (22) to needle valves (23) and assemble nee-

­dle valves to housing.
Assemble plate (89) to housing, securing with screws (90).

-

-Assemble valve body to housing and assemble cops (12) with “0”
rings (13) to housing.

-If check valves (17) have been removed, assemble “O” rings (16)
to valves and assemble valves to housing.

-Assemble springs (18) to housing.

-Assemble “O” ring (20) to screw plug (21) and assemble to
housing.

-Assemble screw plug (19) to housing.

-Assemble outer sleeve and components to housing as described
in air piston assembly section.

.

Cover

:

Pipe Plug

3

Adapter

4

Lock Washer
Trip Bracket
Adjustment Screw “A”

i
7

Adjustment Screw “B”
Nut (2 req’d )
Pipe Nipple

i

Valve Housing

10

11

“O” Ring (3 req’d )

12

Cap (2 req’d)
“O” Ring (2 req’d)

13
14

Valve Body
“O” Ring (5 req’d) ::

15
16

“O” Ring (2 req’d )

17

Check Valve (2 req’d)

18

Spring (2 req’d)
Screw Plug

19

“O” Ring : : :

20

21

Screw Plug
“O” Ring (2 req’d) : :

2’:

Needle Valve (2 req’d)
Pipe Plug (2 req’d )

z.2

Button Bleed Valve (2 req’d )
Stud

26

“O” Ring

ii

“O” Ring
Screw (2 req’d)

29

Washer (2 req’d)

30

Housing and Valve Assembly (includes
items 10 thru 30)
“O” Ring

33:

Bearing Race
Piston

33

34

Seal (2 req’d )
Air Cylinder

35

Retaining Ring

36

37

“O” Ring

38

Muffler Cap
“0” Ring

39

Screen

40

41

Outer Sleeve

42

Torque Pin
Muffler

43
44

Manifold (includes items 45 and 46)

45

Set Screw
“O” Ring (2 req’d)

46

47

Thread Guard

48

Piston Rod
Retaining Ring

49

40294

Y227-2-L
44883
Y14-616
41713-2

40292-2
40292-2

Y11-4-C
40857-7-1
40285
34276

46696

Y325-12
40287
41082
Y325-2

39587

35133

39652

Y325-3
38863
Y325-7
48441-1
Y227-2-L
24130
46558
Y325-26
Y325-24

Y154-19

Y14-4
40813-l

41534
42364

39459-l
35922
39458
39471
Y325-16
39456

Y325-24

39461
40295
40297-l
43551-2
41204
Y29-82
Y325-29
35912
40293-1
Y145-20

I

“O” Ring (2 req’d)

50

Motor Housing

51

Cap
Shield

53

Rear End Plate

55
56

Bearing

58

Rotor

7 teeth, used with motor ass’y 33654-2

12 teeth, used with motor ass’y 34746-2

59

Blade (5 req’d )

60

Roll Pin
Roll Pin

Cylinder (Includes items 60 and 61)

62
63

Cylinder (includes item 60)
Front End Plate (used with motor 33654-2)

64

Bearing

66

Front End Plate (used with motor 34746-2)

67

Bearing
Motor Assembly

for 550 r.p.m. models
for 900 r.p.m. models

68

Spacer

69

Spacer

70

Bearing

71

Shaft (2 req’d)

72

Spacer

73

Spindle

74

Gear (2 req’d ) 20 teeth

75

Shaft (2 req’d)

76

Spindle

77

Gear (2 req’d) 17 teeth

78

Shaft (2 req’d)
Spindle

80

Spacer
Ring Gear

s8:

Retaining Ring

83

Ring Gear (includes grease fitting 35967)

84

Bearing (2 req’d)
Spindle Nut

ii

: Lock Nut

Seal

ii

Ring Gear
Auxiliary Gearing Ass’y (4.83:1) includes

items 70 (2 req’d ), 77 (2 req’d), 78
req’d), 79, 80, 81 and 82

Auxiliary Gearing Ass’y (8:l) includes items

70 (2 req’d), 71 (2 req’d), 72, 73, 74 (2
req’d), 82 and 88

Drive Gearing Ass’y (4.83:1) includes items

70, 75 (2 req’d), 76, 77 (2 req’d) and
83 thru 87

Plate

a9

90

Screw (2 req’d)

Y325-13
40296
39466
39465
33096
38232

33026-1
34734-1

32860
33416
Y178-1

33397

34747
33024
32851
34742
Y65-8

33654-2
34746-2
34737
33018

32850
33021
33019
36289

33048
38722

39468

34745
34735

35915

34736

35914
35900
39481
48305-l
38893-l
38250
38895
36288

(2

36017

36287

39478
48440-l
Y211-1

SERVICE KIT NO. 41205-1

FOR SERVICING ONE MODEL 8246-D8-2

QTY PART NO. DESCRIPTION

-­1

38232

5

32860
3 34276
2 35733
2

35922

1 39461 Screen
1 39466 Cap

5 41082 “O” Ring

1 41534 “O” Ring
1 41795 Motor Oil

Bearing

Blade

“O” Ring
Spring

Seal

10

QTY PART NO. DESCRIPTION

1

41799

1

41954

1

Y65-8

2

Y325-2

1

Y325-3

2

Y325-7

2

Y325-12

2 Y325-13

1

Y325-16 “O” Ring

2

Y325-24
Y325-26

Gear Lube
“O” Ring Lube

Bearing
“O” Ring
“O” Ring
“O” Ring
“O” Ring
“O” Ring

“O” Ring
“O” Ring

SERVICE KIT NO. 41310-1

FOR SERVICING ONE MODEL 8246-D5-2

QTY PART NO. DESCRIPTION

--

1

38232

1

32851
5 32860
3 34276
2 35733
2

35922 Seal

1 39461 Screen
I 39466 Cap

5 41082

1 41534 “O” Ring 1

Bearing 1 41795 Motor Oil
Bearing 1 41799 Gear Lube

Blade

“O” Ring
Spring 1

“O” Ring

CITY PART NO. DESCRIPTION

--

1 41954 “O” Ring Lube

2 Y325-2

Y325-3
2 Y325-7
2 Y325-12
2 Y325-13

1

Y325-16
2 Y325-24

Y325-26

“O” Ring
“O” Ring
“O” Ring
“O” Ring
“O” Ring
“O” Ring
“O” Ring

“O” Ring

TROUBLE SHOOTING

M104

13

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 retractron

Failure to retrack

POSSIBLE CAUSE

1. Inadequate air supply

2 Feed control valves improp-

erly adjusted.

3. Air leak around cap (12).

4. Dirt or damaged ”O” rings on
spool valve (14).

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 ”O” ring (11) inside

valve housing.

1. Improper adjustment or align-

ment between adjustment screw
and button bleed valve.

CORRECTIVE ACTION

1 Check air supply for correct regulator adjustment (90 p.s.i.g

max. when tool is operating).

2. Refer to set-up procedure, page 1.

3 Check for damage to ”O” ring. Check and insure caps are properly

tightened.

4. Refer to valve section, page 9, and remove spool valve.
Inspect, clean and replace ”O” rings.

5. Remove valve housing from tool. Disassemble and blow all air

passages clear of debris.

1. Check air supply for correct regulator adjustment.

2 Remove valve housing from tool. Disassemble and blow all 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 Refer to set-up procedure, page 1

2. Feed control valves (23) improp­erly adjusted or dirty

3 Air leak around cap (12)

4. Damaged ”O” rings in muffler cap
valve housing or spool valve or
seals on piston.

5. Clogged air passage in valve

housing

ACCESSORIES

2. Check adjustment, refer to page 2. Remove, inspect and
clean,

3 Check for damage to “O” ring. Check and insure caps are properly

tightened.

4. Disassemble, inspect and replace “O” rings and/or seals.

5. Remove valve housing from tool. Disassemble and blow air

passages clear of debris.

11

DIMENSIONAL DATA

I

PN 49999-057