Ingersoll-Rand ARO 8421-A4-W Operator'S Manual Download Page 2

2

WARNING LABEL IDENTIFICATION

FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.

Always wear eye protection
when operating or perform-
ing maintenance on this
tool.

WARNING

WARNING

Always wear hearing 
protection when operating
this tool.

Always turn off the air sup-
ply and disconnect the air
supply hose before install-
ing,  removing or adjusting
any accessory on this tool,
or before performing any
maintenance on this tool.

WARNING

Air  powered  tools  can vibrate
in use.  Vibration, repetitive
motions or uncomfortable po-
sitions may be harmful to your
hands and arms.  Stop using
any tool if discomfort, tingling
feeling or pain occurs.  Seek
medical advice before resum-
ing use.

WARNING

Do not carry the tool by
the hose.

WARNING

WARNING

Do not use damaged, frayed
or deteriorated air hoses
and fittings.

WARNING

Keep body stance balanced
and firm.  Do not overreach
when operating this tool.

WARNING

Operate at 90 psig (6.2 bar/
620 kPa) Maximum air pressure.

90 psig

(6.2bar/620 kPa)

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.

Repeated prolonged operator exposure to
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.

When using a pad having a shank, insert the
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.

Do not operate a Belt Sander with the Cover
removed.

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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