OPERATOR’S MANUAL
SECTION M12
MANUAL 15
INCLUDING:ĂOPERATION,ĂINSTALLATIONĂ&ĂMAINTENANCE Released: 05-75
Revised: 09-01-00
Form: 717-2
“000–1” SERIES RIGHT–ANGLE GRINDER/SANDER
MODELS 8479–1–( ), 8479–2–( ), 8480–1–( ) AND 8480–2–( )
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
• 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.
• Do not use damaged, frayed or deteriorated
air hoses and fittings.
• 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.
• Do not remove any labels. Replace any
damaged label.
USING THE 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.
• 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.
• This tool is not insulated against electric
shock.
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
E2000 INGERSOLL–RAND COMPANY D PRINTED IN U.S.A.
M12
W ARNING LABEL IDENTIFICATION
15
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
WARNING
Always wear eye protection
when operating or performing maintenance on this
tool.
WARNING
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.
90 psig
(6.2bar/620kPa)
WARNING
Always wear hearing
protection when operating
this tool.
WARNING
Do not carry the tool by
the hose.
Operate at 90 psig (6.2 bar/
620 kPa) Maximum air pressure.
WARNING
Keep body stance balanced
and firm. Do not overreach
when operating this tool.
SANDER SPECIFIC WARNINGS
• Use only a sanding pad, buffing wheel or
polishing bonnet with these tools. Do not use
any grinding wheel, bur or metal removing
accessory other than a sanding pad with
these tools. Never use an accessory having a
maximum operating speed less than the free
speed of the Sander in which it is being used.
• These Sanders will operate at the free speed
specified on the nameplate if the air supply
line furnishes 90 psig (6.2 bar/620 kPa) air
pressure at the tool. Operation at higher air
pressure will result in excessive speed.
• Do not operate this Sander away from the
work surface.
• Check for excessive speed and vibration
before operating.
• Do not use this tool if actual free speed
exceeds the nameplate rpm.
• Never exceed the rated rpm of tool.
• Whenever the Angle Head is installed or
repositioned, the Throttle Lever must be
WARNING
• Repeated prolonged operator exposure to
• When using a pad having a shank, insert the
WARNING
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.
WARNING
Do not use damaged, frayed
or deteriorated air hoses
and fittings.
WARNING
WARNING
Read the manual before
operating this tool.
Operate at 90 psig/6.2 bar max.
PN 48176–1 LABEL
(NON–EU MODELS)
This label must appear on the tool at all times. If it is lost or
damaged, a replacement label is available at no cost.
positioned so that reaction torque will not
tend to retain the throttle in the “ON” position.
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 damage as well as tissue necrosis.
Repetitive users of hand–held tool who
experience vibrations should closely monitor
duration of use and their physical condition.
shank to full depth in the collet. When using a
pad on a threaded arbor, make certain the
flange nut is tightened securely. Check the
tightness of the collet nut or flange nut before
operating a Sander to make certain it will not
loosen during operation.
PN 49883 LABEL
(–EU MODELS)
2
LUBRICATION
M12
15
Where Used
Air Motor
‘‘O” Rings & Lip Seals
Gears and Bearings 33153 5 lb. ‘‘EP” – NLGI
ARO Part # Description
29665 1 qt. Spindle Oil
36460 4 oz. Stringy
Lubricant
#1 Grease
Always use an air line lubricator with these tools.
We recommend the following Filter–Lubricator–
Regulator Unit:
ARO Model C28231–810
After each 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.
After each 40 hours of tool operation – Flush tool
with a solution of three (3) parts cleaning solvent to
one (1) part spindle oil.
After each 160 hours of tool operation – Lubricate
gearing of tool thru grease fitting with ARO 33153
grease or equivalent. Gearing should contain
approximately 1/16 oz. (1.8 g) of grease. Pack
bearings with NLGI #1 ‘‘EP” grease (33153).
Do not mark any nonmetallic surface on this tool
with customer identification codes. Such actions
could affect tool performance.
MAIN LINES 3 TIMES
AIR TOOL INLET SIZE
TO
AIR
SYSTEM
TO
AIR
TOOL
LUBRICATOR
REGULATOR
BRANCH LINE 2 TIMES
AIR TOOL INLET SIZE
DRAIN REGULARLY
FILTER
COMPRESSOR
(Dwg. TPD905–1)
3
1/4 – 20 THREAD
LIP OF SEAL THIS SIDE
M12
15
(ATP–4)
22 INCLUDES ROLL PIN (2) Y178–1
15/24 INST ALL WITH SHIELDED SIDE OUT
26 INCLUDES BEARING 43902 AND GREASE
FITTING 35967
27 ASSEMBLE WITH THREAD ADHESIVE
AND TORQUE TO 15 – 18 FT LBS.
30 USED WITH MODELS 8479–1–( ) AND 8479–2–( )
MODEL
NUMBER
R.P.M. LEVER
(ITEM 4)
HEAD
(ITEM 5)
PINION
(ITEM 25)
31 USED WITH MODELS 8480–1–( ) AND 8480–2–( )
32 PRESS TO A DEPTH OF .125” .015”.
33 ASSEMBLE WITH THREAD ADHESIVE
AND TORQUE TO 19 – 21 FT LBS.
34/35 USED WITH MODELS 8479–1–( ) AND 8479–2–( )
NOT SHOWN
48176–1 W ARNING LABEL (STANDARD MODELS)
49883 WARNING LABEL (–EU MODELS)
HOUSING
(ITEM 26)
GEAR
(ITEM 28)
COLLET
(ITEM 34)
CAPACITY
8479–1 13,000 40269 44653 44643 44644 44642 41750–3 1/4”
8479–1–EU 13,000 45953 49945 44643 49968 44642 41750–12 6 mm
8479–2 20,000 40269 44653 44640 44644 44696 41750–3 1/4”
8479–2–EU 20,000 45953 49945 44640 49968 44696 41750–12 6 mm
8480–1 13,000 40269 44653 44643 44644 44642
8480–1–EU 13,000 45953 49945 44643 49968 44642
8480–2 20,000 40269 44653 44640 44644 44696
8480–2–EU 20,000 45953 49945 44640 49968 44696
MODELS WITH –EU SUFFIX ARE ‘‘EC” COMPLIANT MODELS.
4
PART NUMBER FOR ORDERING PART NUMBER FOR ORDERING
M12
15
1 Inlet Adapter 44652–1
2 Air Diffuser 44649. . . . . . . . . . . . . . . . . . . . . . . . .
3 Roll Pin Y178–44. . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Throttle Lever (for –EU models see page 6) See table
5 Head See table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Lock Nut 44654. . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Retaining Ring Y1 10–24. . . . . . . . . . . . . . . . . . . . . .
8 Valve 39382. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 ‘‘O” Ring Y325–6. . . . . . . . . . . . . . . . . . . . . . . . . . .
10 Spring 43244. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 Washer 31389. . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 Cover Screw 33920. . . . . . . . . . . . . . . . . . . . . . .
13 Screw Y8-463-C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14 Washer Y48–6. . . . . . . . . . . . . . . . . . . . . . . . . . . .
15 Ball Bearing 42516. . . . . . . . . . . . . . . . . . . . . . . .
16 Wavy Spring 43150. . . . . . . . . . . . . . . . . . . . . . .
17 Rear End Plate 43185. . . . . . . . . . . . . . . . . . . . .
18 Rotor Blade (4 req’d) 41638. . . . . . . . . . . . . . . .
19 Rotor 44641. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20 Spacer 43149. . . . . . . . . . . . . . . . . . . . . . . . . . . .
21 Roll Pin (2 req’d) Y178–1. . . . . . . . . . . . . . . . . . . .
22 Cylinder (includes item 21) 43152. . . . . . . . . . .
23 Front End Plate 43184. . . . . . . . . . . . . . . . . . . . .
24 Ball Bearing 42515. . . . . . . . . . . . . . . . . . . . . . . .
DISASSEMBLY/ASSEMBLY INSTRUCTIONS
MOTOR ASSEMBLY (includes items 13 thru 24) 44645
25 Bevel Pinion See table. . . . . . . . . . . . . . . . . . . . . . . .
26 Housing See table. . . . . . . . . . . . . . . . . . . . . . . . . . .
27 Nut 43749. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28 Bevel Gear See table. . . . . . . . . . . . . . . . . . . . . . . . .
29 Ball Bearing 43750. . . . . . . . . . . . . . . . . . . . . . . .
30 Collet Shaft 44646. . . . . . . . . . . . . . . . . . . . . . . .
31 Drive Shaft 45171. . . . . . . . . . . . . . . . . . . . . . . . .
32 Lip Seal 41447. . . . . . . . . . . . . . . . . . . . . . . . . . .
33 Bearing Lock Nut 43909. . . . . . . . . . . . . . . . . . .
34 Collet See table. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35 Collet Nut 41751. . . . . . . . . . . . . . . . . . . . . . . . . .
OPTIONAL
Sanding Pad (2”) 44648. . . . . . . . . . . . . . . . . . . .
Sanding Pad (3”) 44647. . . . . . . . . . . . . . . . . . . .
Collet (1/8” cap.) 41750–1. . . . . . . . . . . . . . . . . . . .
Collet (3/16” cap.) 41750–2. . . . . . . . . . . . . . . . . . .
Collet (3 mm cap.) 41750–11. . . . . . . . . . . . . . . . . . .
Collet (6 mm cap.) 41750–12. . . . . . . . . . . . . . . . . . .
NOT SHOWN
Wrench (furnished with models
8479–1–( ) and 8479–2–( ) ) 37167. . . . . . . . . .
Wrench (furnished with all models) 39785. . . .
Always wear eye protection when operating or performing 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 maintenance on this tool.
• 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 model number and serial number.
RIGHT–ANGLE DISASSEMBLY
– Remove lock nut (33). Remove shaft and components.
– Remove nut (27), gear (28) and bearing (29).
– Remove collet nut (35) and collet (34).
RIGHT–ANGLE ASSEMBLY
– Lubricate bearing (29) with ARO 33153 grease.
– Press bearing (29) onto shaft (30 or 31).
– Assemble gear (28) and nut (27) to shaft. Tighten to 15 – 18
ft lbs.
– Assemble seal (32) to lock nut (33). NOTE: Press seal to a
depth of .125” .015.
– Assemble lock nut (33), with seal (32), to shaft.
– Lubricate bearing in housing and gear with ARO 33153
grease.
– Assemble shaft and components to housing and secure
with lock nut (33).
– Assemble collet (34) to shaft and secure with collet nut (35).
MOTOR DISASSEMBLY
– Remove head section. Remove motor from housing.
– Remove gear (25) from rotor.
– Tap threaded end of rotor with a soft face hammer; motor will
come apart. NOTE: Bearings are light press fit in end plates
and press fit on rotor.
– NOTE: Screw (13) is assembled to rotor with a hard drying
adhesive and should not be disassembled unless it is necessary to replace a worn part.
5
DISASSEMBLY/ASSEMBLY INSTRUCTIONS
M12
15
MOTOR ASSEMBLY
– Assemble wavy spring (16) to end plate and assemble end
plate to rotor (19).
– Lubricate bearing (15) with ARO 33153 grease.
– Press bearing (15) on rotor and into end plate (17). NOTE:
Press on inner race of bearing. Assemble with shielded side
out. Outside face of inner race must be flush with end of rotor.
– Assemble washer (14) and screw (13) to rotor using a good
grade of thread adhesive.
– Coat rotor blades (18) with ARO 29665 spindle oil and as-
semble to rotor slots – straight side out.
– Coat i.d. of cylinder (22) with ARO 29665 spindle oil and as-
semble over rotor. NOTE: Air inlet holes in end of cylinder
must be aligned with air inlet holes in end plate (17).
– Lubricate bearing (24) with ARO 33153 grease.
– Assemble bearing (24) to end plate (23), shielded side out.
– Assemble spacer (20) and end plate (23), with bearing, to
rotor. NOTE: Press on inner race of bearing. Be sure rotor
turns without binding.
– Assemble gear (25) to rotor. Lubricate gear with ARO 33153
grease.
– Assemble motor to housing.
45953 LOCK–OFF LEVER ASSEMBLY
THROTTLE DISASSEMBLY
– Remove screw (12), washer (11), spring (10) and valve (8)
with ‘‘O” ring (9).
– Remove inlet adapter (1) and air diffuser (2).
– To remove lock nut (6), remove retaining ring (7).
– To remove lever (4), remove roll pin (3).
THROTTLE ASSEMBLY
– Lubricate and assemble ‘‘O” ring (9) to valve stem (8).
– Assemble valve stem (8) and spring (10) to head and secure
with washer (11) and screw (12).
– Assemble lock nut (6) to head. Secure with retaining ring (7).
– Assemble air diffuser (2) and inlet adapter (1) to head.
– Assemble lever (4) to head, securing with roll pin (3).
Y178–5 ROLL PIN
45777 ARM
45952 LEVER
45778 SPRING
(ATP–2)
6
M12
15
7
PN 49999–324
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