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3

LUBRICATION

Where Used

ARO Part #

Description

‘‘O” Rings & Lip Seals

36460

4 oz. Stringy 

Lubricant

Gears and Bearings

33153

5 lb. ‘‘EP” – NLGI 

#1 Grease

Always use an air line lubricator with these tools.

We recommend the following Filter–Lubricator–
Regulator 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 SIZE

DRAIN REGULARLY

COMPRESSOR

(Dwg. TPD905–1)

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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