SECTION
MANUAL
M10
122
OPERATOR’S MANUAL
INCLUDING:ĂOPERATION,ĂINSTALLATIONĂ&ĂMAINTENANCE
Released: 07-20-88
Revised: 09-01-00
Form: 3325-2
MODELS 8448–A1( )–( ) and 8448–A3( )–( )
ORBITAL SANDERS
ARO is not responsible for customer modification of tools for applications on which ARO
was not consulted.
IMPORTANT SAFETY INFORMATION ENCLOSED.
READ THIS MANUAL BEFORE OPERATING TOOL.
IT IS THE RESPONSIBILITY OF THE EMPLOYER TO PLACE THE INFORMATION
IN THIS MANUAL INTO THE HANDS OF THE OPERATOR.
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
PLACING TOOL IN SERVICE
USING THE TOOL
•
Always operate, inspect and maintain this tool
in accordance with American National
Standards Institute Safety Code for Portable
Air Tools (ANSI B186.1).
For safety, top performance, and maximum
durability of parts, operate this tool at 90 psig
(6.2 bar/620 kPa) maximum air pressure at the
inlet with 5/16” (8 mm) inside diameter air
supply hose.
Always turn off the air supply and disconnect
the air supply hose before installing, removing
or adjusting any accessory on this tool, or
before performing any maintenance on this
tool.
•
•
•
•
Always wear eye protection when operating or
performing maintenance on this tool.
Always wear hearing protection when
operating this tool.
Keep hands, loose clothing and long 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.
Keep body stance balanced and firm. Do not
overreach when operating this tool. High
reaction torques can occur at or below the
recommended air pressure.
•
•
•
•
•
Tool accessories may continue to rotate
briefly after throttle is released.
•
•
Do not use damaged, frayed or deteriorated
air hoses and fittings.
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.
Use accessories recommended by ARO.
This tool is not designed for working in
explosive atmospheres.
Be sure all hoses and fittings are the correct
size and are tightly secured. See Dwg.
TPD905–1 for a typical piping arrangement.
Always use clean, dry air at 90 (6.2 bar/
620 kPa) psig maximum air pressure. Dust,
corrosive fumes and/or excessive moisture
can ruin the motor of an air tool.
Do not lubricate tools with flammable or
volatile liquids such as kerosene, diesel or jet
fuel.
•
•
•
•
•
•
This tool is not insulated against electric
shock.
Do not remove any labels. Replace any
damaged label.
The use of other than genuine ARO replacement parts may result in safety hazards, decreased tool
performance, and increased maintenance, and may invalidate all warranties.
Repairs should be made only by authorized trained personnel. Consult your nearest ARO Authorized
Servicenter.
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: (615) 672–0321, FAX: (615) 672–0801.
ARO Tool Products
Ingersoll–Rand Company
1725 U.S. No. 1 North D P.O. Box 8000 D Southern Pines, NC 28388–8000
E 2000 INGERSOLL–RAND COMPANY D PRINTED IN U.S.A.
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M10
122
LUBRICATION
Do not mark any nonmetallic surface on this tool
with customer identification codes. Such actions
could affect tool performance.
ARO Part #
Description
Where Used
29665
1 qt. Spindle Oil
Air Motor
36460
33153
4 oz. Stringy
Lubricant
‘‘O” Rings & Lip Seals
MAIN LINES 3 TIMES
AIR TOOL INLET SIZE
Gears and Bearings
5 lb. ‘‘EP” – NLGI
TO
AIR
#1 Grease
SYSTEM
TO
AIR
TOOL
Always use an air line lubricator with these tools.
We recommend the following Filter–Lubricator–
Regulator Unit:
ARO Model C28231–810
LUBRICATOR
FILTER
REGULATOR
Every 8 hours of tool operation – Fill lubricator
reservoir of recommended F.R.L. with spindle oil
(29665). If an in line or air line lubricator is not used,
apply several drops of spindle oil (29665) in air inlet.
BRANCH LINE 2 TIMES
AIR TOOL INLET SIZE
DRAIN REGULARLY
COMPRESSOR
After each 160 hours of tool operation, Flush tool with
a solution of three (3) parts cleaning solvent to one (1)
part spindle oil.
(Dwg. TPD905–1)
3
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M10
122
FACE WITH ROUNDED O.D. ON THIS SIDE
4
8
10
3
2
1
✱ 16
✱ 17
18
5
6
7 ✱
9 ✱
19
11
12
15
20
✱ 21
18
13 ✱
14 ✱
✱ 17
22
INSTALL RETAINING RING (16) AS SHOWN
(BOWED AWAY FROM BEARING).
23
24
25
✱
ITEMS INCLUDED IN SERVICE KIT NO. 48248–1.
✩ EXTRA COST ITEM (NOT INCLUDED WITH TOOL).
ASSEMBLE WITH THREAD ADHESIVE SUCH AS LOCTITE 242.
V
26
27
28
40
39
29
30 ✱
NOT SHOWN
✩ 44548 SPANNER WRENCH
41
42
45
43
44
31 ✱
32 ✱
33 ✱
34
35 V
36
37
46
38
(ATP–22)
4
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M10
122
PART NUMBER FOR ORDERING
PART NUMBER FOR ORDERING
1
2
3
4
5
6
7
8
9
Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . See chart
Roll Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . Y178–33
Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See chart
Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 481711
Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48071
Tip Valve . . . . . . . . . . . . . . . . . . . . . . . . . . 48070
Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32858
Spacer . . . . . . . . . . . . . . . . . . . . . . . . . . . . See chart
‘‘O” Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . Y325–14
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
Lock Ring . . . . . . . . . . . . . . . . . . . . . . . . . . 44536
Counterbalance . . . . . . . . . . . . . . . . . . . . . 44572
Bearing Housing . . . . . . . . . . . . . . . . . . . . 39809
Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41093
Shim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39817
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . F15–102
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . Y117–416
Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Y212–43
Drive Plate . . . . . . . . . . . . . . . . . . . . . . . . . 44562
Screw (5 req’d) . . . . . . . . . . . . . . . . . . . . . Y194–382
Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See chart
Screw (4 req’d) . . . . . . . . . . . . . . . . . . . . . Y134–84C
Screw (6 req’d) . . . . . . . . . . . . . . . . . . . . . Y61–85–C
Nut (2 req’d) . . . . . . . . . . . . . . . . . . . . . . . . 72458
Washer (2 req’d) . . . . . . . . . . . . . . . . . . . . Y117–8
Roll Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . Y178–139
Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44563
Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42704
Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42705
Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42703
Screw (2 req’d) . . . . . . . . . . . . . . . . . . . . . Y194–382
PAPER HOLDER ASSEMBLY (include
10 Inlet Adapter . . . . . . . . . . . . . . . . . . . . . . . 48069
11 Valve Stem . . . . . . . . . . . . . . . . . . . . . . . . . 48065
12 Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . 48068
13 ‘‘O” Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . Y325–13
14 Retaining Ring . . . . . . . . . . . . . . . . . . . . . . Y147–62
15 Roll Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . Y178–47
16 Retaining Ring . . . . . . . . . . . . . . . . . . . . . . 44533
17 Bearing (2 req’d) . . . . . . . . . . . . . . . . . . . . 48169–1
18 End Plate (2 req’d) . . . . . . . . . . . . . . . . . . 44529–1
19 Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . 44531
20 Rotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44532
21 Blade (5 req’d) . . . . . . . . . . . . . . . . . . . . . . 44538
22 Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39442
23 Spindle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44669
MOTOR ASSEMBLY (includes items
items 39 thru 46) . . . . . . . . . . . . . . . . . . . . 44574
Sleeve (not shown) . . . . . . . . . . . . . . . . . . See chart
SERVICE KIT: includes items 7, 9, 13,
47
16 thru 23 . . . . . . . . . . . . . . . . . . . . . . . . . . 44566
24 Spacer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44878
25 Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44564
14, 16, 17, 21, 30, 31, 32 and 33 . . . . . . 48248–1
MODEL NO. R.P.M. HOUSING LEVER SPACER
PAD
PAD DESCRIPTION
5/16” FELT PAD
SLEEVE
(ITEM 1) (ITEM 3) (ITEM 8) (ITEM 36)
(ITEM 47)
49465
49465
49466
49465
49465
49466
49466
8448–A1C
8000
48064
48064
48066
48064
48064
48066
48066
48067
48067–1
48067
44570
44570
44570
44571
44571
44571
44571
8448–A1C–EU 8000
5/16” FELT PAD
8448–A1K
8448–A3C
8000
8000
48072
5/16” FELT PAD
48067
1/2” SPONGE RUBBER PAD
1/2” SPONGE RUBBER PAD
1/2” SPONGE RUBBER PAD
1/2” SPONGE RUBBER PAD
8448–A3C–EU 8000
8448–A3K 8000
8448–A3K–EU 8000
48067–1
48067
48072
48072
48067–1
MODELS WITH –EU SUFFIX ARE ‘‘EC” COMPLIANT MODELS.
5
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M10
122
DISASSEMBLY/ASSEMBLY INSTRUCTIONS
–
–
–
–
Install retaining ring (16) to groove in spindle, with ring
bowed away from motor.
Place housing (1) in a suitable holding device, with ‘‘motor
end” in an upright position.
Place a 1/8” diameter rod (6” to 8” long) into the blind hole
provided in housing for roll pin.
Align notches in end plates and cylinder with rod and slide
motor assembly down rod and into housing.
Remove rod and insert roll pin (15).
Always wear eye protection when operating or perform-
ing maintenance on this tool.
Always turn off the air supply and disconnect the air
supply hose before installing, removing or adjusting any
accessory on this tool or before performing any mainte-
nance on this tool.
–
–
–
Assemble spacer (24) into housing (1).
Assemble boot (25) to housing, aligning tab on boot with
slot in housing.
–
–
Assemble lock ring (26) to housing – LEFT HAND
THREADS – securing motor assembly and boot.
Pack bearing (29) with ARO 33153 grease and assemble to
bearing housing (28), pressing on outer race of bearing.
NOTE: Assemble with shielded side out.
Assemble counterbalance (27) and bearing housing (28) to
spindle (23), pressing on inner race of bearing.
Assemble shim (30), washer (31) and washer (32) to tool,
securing with screw (33).
• Never apply excessive pressure by a holding device which
may cause distortion of a part.
• Apply pressure evenly to parts which have a press fit.
• Apply even pressure to the bearing race that will be press
fitted to the mating part.
• Use correct tools and fixtures when servicing this tool.
• Don’t damage ‘‘O” rings when servicing this tool.
• Use only genuine ARO replacement parts for this tool.
When ordering, specify part number, description, tool mod-
el number and serial number.
–
–
–
Assemble drive plate (34) to tool, securing with five screws
(35) and six screws (38). NOTE: Be sure tab on boot (25) is
aligned with slot in housing (1).
–
–
Assemble pad (36) to drive plate (34), securing with four
screws (37).
NOTE: When replacing entire plate and paper holder as-
sembly, replace with riveted holder assembly (44567).
When replacing paper holder assembly only, replace with
paper holder assembly (44574).
MOTOR DISASSEMBLY
–
–
Remove four screws (37), releasing pad (36) from tool.
Remove six screws (38) and five screws (35), releasing
drive plate (34), with paper holder assemblies.
Remove screw (33), washer (32), washer (31), shim (30),
bearing (29), bearing housing (28) and counterbalance
(27).
–
–
Assemble paper holder assembly to drive plate (34), secur-
ing with screws (46), washers (40) and nuts (39).
–
–
Remove lock ring (26) – LEFT HAND THREADS – boot (25)
and spacer (24).
Remove motor assembly and pin (15). NOTE: It may be
necessary to tap housing with a soft face hammer to loosen
motor from housing.
THROTTLE DISASSEMBLY
–
–
Remove pad (36) and drive plate (34) (see ‘‘Motor Disas-
sembly”).
Remove inlet adapter (10) and ‘‘O” ring (9), releasing
spacer (8) (where applicable), spring (7) and valve (6).
NOTE: Do not remove seat (5) unless damage is evident.
Remove retaining ring (14), releasing regulator (12), with
‘‘O” ring (13), and valve stem (11).
–
–
Remove retaining ring (16).
Using special brass blocks to fit around o.d. of cylinder,
clamp around cylinder and press spindle (23) thru bearing
(17) and end plate (18).
Remove blades (21), rotor (20) and key (22).
Remove other bearing (17) and end plate (18).
–
–
–
–
To remove lever (3), remove roll pin (2).
THROTTLE ASSEMBLY
MOTOR ASSEMBLY
–
–
Grease and assemble ‘‘O” ring (13) to regulator (12).
Coat valve stem (11) with ARO 29665 spindle oil and as-
semble to housing, with hole in valve stem in line with hous-
ing to accept valve (6).
Coat valve (6) with ARO 29665 spindle oil and assemble to
housing, securing valve stem (11).
Assemble spring (7) and spacer (8) (where applicable) to
housing, securing with ‘‘O” ring (9) and inlet adapter (10).
Assemble regulator (12) to housing, securing with retaining
ring (14).
Assemble drive plate (34) and pad (36) to tool (see ‘‘Motor
Assembly”).
–
Press bearings (17) into end plates (18), pressing on outer
race of bearings.
Assemble one end plate (18) onto spindle (23).
Install key (22) in key slot.
Assemble rotor (20) to spindle (23), aligning keyway to key
(22).
Coat five rotor blades (21) with ARO 29665 spindle oil and
assemble to rotor slots – straight side out.
Coat i.d. of cylinder (19) with ARO 29665 spindle oil and as-
semble over rotor.
–
–
–
–
–
–
–
–
–
–
Assemble end plate (18), with bearing (17), to spindle (23),
pressing on inner race of bearing.
6
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M10
122
7
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PN 49999–302
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