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OPERATOR’S MANUAL

INCLUDING:ĂOPERATION,ĂINSTALLATIONĂ&ĂMAINTENANCE

Released:  08-31-90

Revised:    09-01-00

Form:          ă3709-2

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2000 INGERSOLL–RAND COMPANY 

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 PRINTED IN U.S.A.

Ingersoll–Rand Company

1725 U.S. No. 1 North 

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 P.O. Box 8000 

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 Southern Pines, NC 28388–8000

ARO Tool Products

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.

MODELS 8421–A4–W

ROTARY 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

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.

Summary of Contents for ARO 8421-A4-W

Page 1: ... 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 remov...

Page 2: ... 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 su...

Page 3: ...ulator Unit ARO Model P29231 110 EVERY 160 HOURS OF TOOL OPERATION Flush tool with a solution of equal parts cleaning solvent and spindle oil 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 FILTER BRANCH LINE 2 TIMES AIR TOOL INLET SIZ...

Page 4: ...3 2 6 1 10 20 4 12 8 11 17 21 14 5 9 7 INSTALL RETAINING RING 21 AS SHOWN BOWED AWAY FROM BEARING 19 13 16 15 18 22 23 24 25 26 28 22 23 29 27 30 31 32 FACE WITH ROUNDED O D ON THIS SIDE ATP 562 4 ...

Page 5: ...p housing with a soft face hammer to loosen motor from housing Remove retaining ring 21 Using special brass blocks to fit around o d of cylinder clamp around cylinder and press shaft of spindle 29 thru bearing 22 and end plate 23 Remove blades 25 rotor 26 and key 28 Remove other bearing 22 and end plate 23 MOTOR ASSEMBLY Assemble bearings 22 into end plates 23 pressing on out er race of bearings P...

Page 6: ...adapter Grease and assemble O ring 12 to regulator 11 Assemble valve stem 10 to housing with hole in valve stem in line with housing to accept valve 6 Assemble seat 5 to housing with rounded corners into hous ing first Coat valve 6 with ARO 29665 spindle oil and assemble to housing securing valve stem 10 Assemble regulator 11 to housing securing with retaining ring 13 Assemble guard 30 and lock ri...

Page 7: ...7 ...

Page 8: ...PN 49999 103 ...

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