Page 1
OPERATOR’S MANUAL
INCLUDING: OPERATION, INSTALLATION & MAINTENANCE
“22” SERIES SHORT GRINDERS
Models: 7149-C, 7153-C,
7235-C and 7236-C
READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
l
To aid the operator’s understanding of proper and safe use of
grinders, the publications, “Use, Care and Protection of Abrasive
Wheels”, A.N.S.I. B7.1, and “Safety Code for Portable Air Tools”,
A.N.S.I. B186.1, can be purchased from:
Do not use excessive work pressure.
l
Do not remove any labels. Replace any damaged label.
l
Use only accessories recommended by ARO.
SECTION
M10
MANUAL 43
Released: 5/79
Revised: 1 O-20-95
Form:
1566-2
American National Standards Institute, Inc.
1430 Broadway
New York, New York 10018
Operate this tool at 90 p.s.i.g. (6.2 bar) maximum air pressure
at the air inlet of the tool..
Disconnect air supply from tool before removing/installing
wire brush or rotary file or performing other maintenance procedures.
Keep hands, clothing and tong 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.
Never exceed rated r.p.m. of tool.
Wear suitable eye and hearing protection while operating tool.
Tool shaft can continue to rotate briefly after throttle is released.
Do not lubricate tools with flammable orvolatile liquids such as
kerosene, diesel or jet fuel.
Use tool only for purposes for which it was intended.
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
tools who experience vibrations should closely monitor duration
of use and their physical condition.
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.
ARO is not responsible for customer modification of tools for
applications on which ARO was not consulted.
Tool maintenance and repair should be performed by authorized, trained, competent personnel. Consult your nearest
ARO authorized servicenter.
It is the responsibility of the employer to place the information
in this manual into the hands of the operator.
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 l P.O. Box 8000 l Southern Pines, NC 283888000
©1995 THE ARO CORPORATION l PRINTED IN U.S.A.
-0
Part of worldwide Ingersoll-Rand
Page 2
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
Turn off air supply and disconnect
air supply hose before installing,
removing or adjusting any
accessory on this tool, or before
performing any maintenance on
this tool.
Do not carry the tool by the hose.
I
I
Wear hearing protection when
operating this tool.
m
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.
Do not use damaged, frayed or
deteriorated air hoses and
fittings.
Do not overreach when operating
this tool. Keep body stance
balanced and firm.
This label must appear on
PN 48176-1 LABEL
WARNING = Hazards or unsafe practices which could
property damage.
no cost.
Operate at 90 p.s.i.g.
(6.2 bar/620 kPa)
maximum air pressure.
result in severe personal injury, death or substantial
CAUTION = Hazards or unsafe practices which could result in minor personal injury or product or property
damage.
NOTICE = Important installation, operation or maintenance information.
2
Page 3
ROUTINE LUBRICATION REQUIREMENTS
Ml0
43
Lack of or an excessive amount of lubrication will affect the performance and life of this tool. Use only recommended lubricants at
below time intervals:
EVERY 8 HOURS OF TOOL OPERATION - Fill lubricator reser-
voir 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.
EVERY 40 HOURS OF TOOL OPERATION - Flush tool with a
solution of three (3) parts cleaning solvent to one (1) part spindle
oil. After flushing, apply a small amount of spindle oil in air inlet and
run tool for one minute to insure proper lubrication.
AIR SUPPLY REQUIREMENTS
For maximum operating efficiency, the following air supply specifi-
cations should be maintained to this air tool:
l
AIR PRESSURE - 90 p.s.i.g. (6.2 bar)
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AIR FILTRATION - 50 micron
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LUBRICATED AIR SUPPLY
l
HOSE SIZE - 5/16” (8 mm) I.D.
An ARO® model C28231-810 air line FILTER/REGULATOR/LUBRICATOR (F.R.L.) is recommended to maintain the above air
supply specifications.
RECOMMENDED LUBRICANTS
trained, competent personnel. Tools, hose and fittings shall be replaced if unsuitable for safe operation and responsibility should
be assigned to be sure that all tools requiring guards or other safety devices shall be kept in legible condition. Maintenance and repair records should be maintained on all tools. Frequency of
repair and the nature of the repairs can reveal unsafe application.
Scheduled maintenance by competent authorized personnel
should detect any mistreatment or abuse of the tool and worn
parts. Corrective action should be taken before returning the tool
for use.
Disassembly should be done on a clean work bench with a clean
cloth spread to prevent the loss of small parts. After disassembly
is completed, all parts should be thoroughly washed in a clean solvent, blown dry with air and inspected for wear levels, abuse and
contamination. Double sealed or shielded bearings should never
be placed in solvent unless a good method of m-lubricating the
bearing is available. Open bearings may be washed but should
not be allowed to spin while being blown dry.
Upon reassembling, lubricate parts where required. Use 33153
grease, or equivalent, in bearings. Use 36460 lubricant for “O”
ring assembly. When assembling “O” rings or parts adjacent “O”
rings, care must be exercised to prevent damage to the rubber
sealing surfaces. A small amount of grease will usually hold steel
balls and other small parts in place while assembling.
Before mounting a wheel, after all tool repairs and whenever a
grinder is issued for use, the speed of the grinder shall be checked
with a tachometer to make certain that its actual speed does not
exceed its rated speed.
Afterdisassembly is complete, all parts, except sealed or shielded
bearings, should be washed with solvent. To relubricate parts, or
for routine lubrication, use the following recommended lubricants:
Where Used
Air Motor
“O” Rings & Lip Seals
Gears and Bearings
36460
33153
Description
1 qt Spindle Oil
4 oz. Stringy Lubricant
5 lb. “EP” - NLGI #1 Grease
INSPECTION, MAINTENANCE AND INSTALLATION
Disconnect air supply from the tool or shut off air supply and exhaust (drain) line of compressed air before performing maintenance or service to the tool.
It is important that the tools be serviced and inspected at regular
intervals for maintaining safe, trouble-free operation of the tool.
Be sure the tool is receiving adequate lubrication, as failure to lu-
bricate can create hazardous operating conditions resulting from
excessive wear.
Be sure that the air supply lines and connectors are of proper size
to provide a sufficient quantity of air to the tool.
Safety guards shall be in good functional condition. Damaged,
bent or severely worn guards shall be replaced. A guard which
has been subjected to a wheel failure is likely to be internally
weakened and shall not be reused.
REPLACE GUARD.
When replacement parts are necessary, consult drawing containing the part for identification.
Always use clean, dry air. Dust, corrosive fumes and/or excessive
moisture can damage the motor of an air tool. An air line filter can
greatly increase the life of an air tool. The filter removes rust,
scale, moisture and other debris from the air lines. Low air pressure (less than 90 p.s.i.g.) reduces the speed of the air tool. High
air pressure (more than 90 p.s.i.g.) raises performance beyond
the rated capacity of the tool and could cause injury. Shown below
is a typical piping arrangement.
MAIN LINES 3 TIMES
AIR
TOOL
INLET SIZE
BRANCH LINE 2 TIME
AIR TOOL INLET SIZE
Tool maintenance and repair shall be performed by authorized,
COMPRESSOR
DRAIN REGULARLY
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Page 4
The grinder models listed in the model identification table above arefurnished with collet assembly 41753-3 (1/4”capacity) as standard equipment and are intended for
and
use with mounted wheels and shall not be used with othertype grinding wheels unless a proper wheel guard, recommended by the grinder manufacturer, is attached to
thegrinder. See ”Grinding Wheel Mounting Instructions”, page 5. Other size collet inserts
(1/8” or 3/16”) or other collet assemblies listed on page 9 can
be
furnished
the above listed models.
The above listed grinder models that are furnished with optional arbor assembly 36934, must also be equipped with wheel guard 44451 (2” maximum wheel diameter).
Arbor assembly 36934 is for
The above listed grinder models that are furnished with optional cone wheel adapter 37292-( ) are for use with types 16, 17, 18, 18R and 19 cone and plug wheels and
shall not be used with other type grinding wheels unless a proper wheel guard, recommended by the grinder manufacturer, is attached to the grinder. See “Grinding
Wheel Mounting Instructions”, page 5 and “Accessories” section, page 9.
USe
with type 1 non-threaded grinding wheels only. See “Grinding Wheel Mounting Instructions”, page 5 and “Accessories”, page 9.
OPERATION
Safe and efficient operation of your ARO grinder can best be attained by observing proper operating, inspection and maintenance procedures. Allow only competent
qualified people to operate grinder and subject each grinder to a regular inspection and maintenance procedure. The qualified grinder operator must be carefully
instructed in the safe operation and use of the grinder, including a study of the manufacturer’s literature. The grinder operator should have a good attitude regarding
safety.
Operator Safety Equipment. The grinder operator shall wear safety goggles or
face shield at all times the grinder is turned on. Other protective clothing shall be
worn if necessary for spark deflection. Respirators shall be used in poorly ventilated areas. Adjacent personnel shall be protected from grinding sparks and
wheel fragments by protective barriers.
Starting and Stopping. Before starting a grinder, the operator shall make sure that
no one is in the unguarded plane of wheel rotation. Upon mounting a new wheel,
grinder shall be run at operating speed with the safety guard in place or in a protected enclosure for at least one minute before applying the wheel to the work.
Check speed and balance of wheel.
Before a grinder is put down, the throttle shall be released and the wheel shall
come to a stop. Tool rests, hangers or balancers are recommended.
Use only wheels with adequate speed ratings. The maximum operating speed Use recommended guard.
marked on the wheel, blotters or packaging, shall equal or exceed the rated
speed stamped on the grinder.
At each wheel change, Aro recommends the free speed be checked by competent authorized personnel, using a good reliable tachometer, to assure that the
maximum tool speed is lower than manufacturers rated speed for the wheel to be
used. A speed check shall never be made with grinding wheel on the grinder.
Grinders shall not be operated at a speed exceeding its rated speed.
If a wire brush should ever be used with this tool; insure the speed rating of the
brush is greater than the speed of the tool the brush is to be used with and insure
the brush conforms to applicable safety standards. Be certain the brush is compatible with mounting of the tool. Always use a wheel guard.
SAFETY GUIDE FOR PORTABLE GRINDER USE
Some
of the more
Do always handle and store wheels in a careful manner (handle with due
regard, grinding wheels are fragile).
Grinding wheels shall be stored in protective racks or containers and protected from moisture and temperature extremes.
Do visually inspect all wheels before mounting for possible damage In
transit.
Do check maximum operating speed established for the wheel against
grinders speed.
Do check mounting flanges for correct size and design (see “Accessorles”
page 11.
Do use mounting blotters supplied with wheels where applicable.
Do be sure tool is kept in first class operating condition.
Do always use a guard covering at least 1/2 of the grinding wheel.
Do allow newly mounted wheels, with guard in place, to run at operating
speed for at least one minute before grinding.
Do always wear safety glasses or goggles when grinding.
Do always observe all safety rules when operating or handling portable
grinders.
common causes
of wheel
DO
breakage are: Improper
mounting of the wheels, improper speeds, abusive operation and careless handling.
and
Don’t use a wheel that has been dropped.
Don’t force a wheel onto the spindle or alter the size of the mounting. If the
wheel won’t fit the spindle, get one that will.
Don’t use mounting flanges on which the bearing surfaces are not clean
and flat,
Don’t tighten the mounting nut excessively. lighten only sufficiently to
drive the wheel and prevent slippage.
Don’t grind on the side of the wheel unless wheel is specifically designed
for that purpose.
Don’t start the grinder until the wheel guard is in place.
Don’t jam the wheel Into the work.
Don’t stand directly in front of a grinding wheel whenever a grinder Is
started.
Don’t grind material for which the wheel is not designed.
Grinding In grooves may be hazardous.
DON’T
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Page 5
GRINDING WHEEL MOUNTING INSTRUCTIONS
Disconnect air supply from grinder or shut off air supply and exhaust (drain) air
line of compressed air before mounting or removing any abrasive wheel or wire
brush, or otherwise performing maintenance or service to the tool.
Check grinder speed before mounting grinding wheel (or other type accessory)
with a reliable tachometer to make sure that the actual speed of the grinder does
not exceed its rated free speed.
Check operating speed of grinding wheel or wire brush to be used with the grinder. The maximum operating speed marked on the grinding wheel, blotters or
packaging, shall equal or exceed the rated free speed of the grinder. Also, the
type and size of the grinding wheel or wire brush shall be compatible with the
grinder size and type.
MOUNTING INSTRUCTIONS FOR MOUNTED WHEELS
FOR USE WITH COLLET ASSEMBLIES.
The collet shall be checked to assure it to be in good condition and properly af-
fixed to the grinder spindle.
The mandrel shall be inserted to the full depth of the gripping jaws of the collet. At
least 1/2 the mandrel length shall be inserted into the Collet.
The maximum safe operating speed for mounted wheels shall be determined by
the following: 1.) Shape and size of the mountedwheel, 2.) Size of mandrel and
3.) Overhang of mandrel. In no case shall the maximum safe operating speed recommended by the wheel manufacturer be exceeded.
M10
43
Check abrasive wheels prior to mounting for chips or cracks. Cracked or chipped
wheels shall not be used.
Care must be taken that a grinding wheel, or wire brush, of the correct speed rating is used. Rated wheel capacities for Aro grinders are maximum only. Regardless of the rated capacity and speed of any Aro grinder, abrasive wheels or wire
brushes shall never be operated at a speed greater than that recommended by
the wheel (or brush) manufacturer.
Dressing Abrasive Wheels. Upon mounting a grinding wheel, the tool should be
operated at gradually increasing speed and checked for good balance of the
wheel. If unbalance is observed, the wheel shall be dressed. If dressing fails to
establish acceptable balance, the wheel shall not be used.
WARNING: Work pressure, if excessive, can be the cause of trouble and a
source of danger, thru bending or fracture of the mandrel. Pressure between the wheel and the work should never be so heavy that springing of
the mandrel will result.
MANDREL OVERHANG - DIMENSION “0”
FIGURE 1
IMPORTANT NOTICE: lncreaslng the overhang of the mandrel will reduce the maximum wheel size that can be safely used with the speed of the tool (dlmenslon “0”, figure 1). Also, the length and diameter of mandrel combined with the size and shape of the wheel are determining factors which must be considered when selecting a mounted wheel that will be compatible with the rated free speed of the tool. It is recommended the “Tables of Maximum Operating
Speeds for Mounted Wheels” of the American National Standard publication 87.1-1979 previously mentioned or other reliable source, be consulted to
determine the safe operating speed of a particular size and shape of wheel combined with the size and overhang of mandrel.
MOUNTING INSTRUCTIONS FOR TYPE 1 GRINDING WHEELS
The driving flange shall be inspected to see that it is of the relieved type, that its
diameter is at least 1/3 the diameter of the wheel and that it is free of nicks, burrs
and sharp edges. A blotter, separate or attached to the wheel and at least the dia meter of the driving flange, shall bear against the driving flange. The wheel shall
be placed on the spindle following the first blotter. The wheel shall not fit too snugly nor too freely on the spindle. The normal diametral clearance between the
wheel
and
the spindle is approximately ,007” (.17 mm) maximum. Abrasive
wheels which do not properly fit the spindle shall not be used. Separate reducing
bushings, unless supplied or recommended by theabrasive wheel manufacturer,
shall not be used to adapt larger hole abrasive wheels.
A second blotter, separate or attached to the wheel and at least the diameter of
the outside flange, shall follow the wheel on the spindle. An outer flange, the
same diameter as the driving flange, shall follow the second blotter. The outer
flange
shall have a relief and contact face identical to the driving flange, placed toward
the blotter.
A spindle end nut shall follow the outer flange. Hold spindle from rotating and
screw spindle end nuts firmly against the outer flange, but only tight enough to
insure sufficient friction on the blotter faces to drive the wheel. Excessive tightening can distort the flanges. The spindle shall project flush with or past the end of
the spindle end nut. To secure wheels thinnerthan the unthreaded length of the
spindle,a spacer shall be used between the flange and the spindle end nut. Such
a spacer shall be a precision part, with parallel faces running true to the spacer’s
center hole.
The safety guard shall be properly positioned and the mounting checked to assure secure positioning. The guard cover shall be closed and secured.
MOUNTING INSTRUCTIONS FOR TYPES 16, 17, 18, 18R AND 19 CONE AND PLUG WHEELS
FOR USE WITH 37292-( ) WHEEL ADAPTER
The driving flange shall be inspected to see that it is of the flat, unrelieved type,
that its diameter is at least 1/3 the diameter of the wheel and that
it is free of nicks,
burrs and sharp edges.
The spindle and wheel threads shall be inspected to see that they are of the same
pitch and diameter and a blotter, separate or attached to the wheel and at least the
diameter of the driving flange, shall bear against the driving flange.
The grinding wheel shall be tightened on the spindle by hand and shall bearfirmly
against the blotter and driving flange. If the wheel cannot be secured, the spindle
length shall be checked. If the spindle length is correct and the cone wheel still will
not fit firmly against the blotter and driving flange, the wheel shall not be used and
a proper fitting wheel shall be selected.
5
Page 6
DISASSEMBLY AND ASSEMBLY OF TOOLS
Disconnect air supply from tool or shut off air supply and exhaust
(drain) line of compressed air BEFORE performing maintenance
or service to tool.
5/32” hex type wrench, insert hex wrench thru collet body and into
hex end of rotor to hold rotor from turning and remove collet body
(41752).
Before starting to disassemble or assemble this tool (any part or
completely), be sure to read “Inspection, Maintenance and lnstallation” section.
To minimize the possibility of parts damage and for convenience,
the steps for disassembly or assembly listed on the following
pages are recommended.
The basic sections and instructions for removing them from the
tool are as follows:
MOTOR SECTION
Remove collet nut (41751) and collet insert (41750-). Using a
TYPICAL CROSS SECTION OF TOOL
Locating on flats of head, secure head in a suitable holding device. Using a strap type wrench on motor housing, unthread and
remove motor housing from head. Remove motor assembly from
housing. For complete disassembly of motor, see page 7.
HEAD SECTION
Throttle components can be serviced without removing head section from tool. See page 8 for complete disassembly.
To remove screen (44933) from housing, remove retainer ring
(35619) and exhaust sleeve (43833-l).
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Page 7
DISASSEMBLY
MOTOR SECTION
M10
43
Remove motor from housing (see page 6). Grasp cylinder in one
hand and tap threaded end of rotor with a soft face hammer; motor
will come apart.
ASSEMBLY
NOTE: Pack bearings with ARO 33153 grease and coat i.d. of cyl-
inder with ARO 29665 spindle oil upon assembly.
Assemble bearings into end plates, pressing on outer race of
bearings. Assemble end plate (30129) to rotor, pressing on inner
MOTOR ASS’Y NO. R.P.M. ROTOR NO. BLADE NO. BLADE QUANTITY
37510-1
41389-3
NOT INCLUDED WITH MOTOR ASS’Y
18,000
14,500
#INCLUDED WITH CYLINDER 30972
30435-l
32374-l
race of bearing. Assemble cylinder over rotor, aligning air inlets of
cylinder and end plate and roll pin (Y17B-20) with hole in end
plate (largest hole). Assemble blades to rotor - straight side out.
Assemble spacer (30437) and end plate (30432) to rotor, pressing on inner race of bearing.
Be sure rotor does not bind (if rotor binds, tap threaded end lightly
to loosen) and assemble collet body (41752) to rotor. Assemble
motor and spacer (30440) into housing and secure with head section.
41520
41520
4
6
PARTS MARKED THUS ARE INCLUDED IN SERVICE
KIT NO. 40102-l. SEE PAGE 9.
Page 8
DISASSEMBLY
HEAD SECTION
ASSEMBLY
Remove valve plug (30600) and valve components can be re-
moved from head. To remove lever throttle, remove roll pin
(Y178-28). To remove button throttle, remove roll pin
(Y178-212).
THROTTLE BUTTON30346
Assemble “O” ring (Y325-7) to valve stem. Assemble valve stem
into head. Assemble spring (30609) and regulator (30603) into
head, aligning hole in regulator with air inlet of head. Assemble
seal (30602) to head and secure valve components with “O” ring
(Y325-13) and valve plug (30600).
LEVER 30610
ADAPTER 328
VALVE PLUG 30600
I
JI INCLUDED IN 47052 LOCK-OFF LEVER ASSEMBLY
* 46548 ROLL PIN
HOUSING 30653-l
30547 LEVER HEAD ASSEMBLY
47052 LOCK-OFF LEVER ASSEMBLY
32654 ADAPTER
23902-210 CONNECTOR, l/4”
(NOT INCLUDED IN 30547-l
LEVER HEAD ASSEMBLY)
OPTIONAL 30547-l LEVER HEAD ASSEMBLY - LOCK-OFF TYPE
INCLUDES PARTS SHOWN IN THIS GROUP (EXCEPT CONNECTOR), PLUS: VALVE STEM (46135), “O” RING (Y325-7), SPRING (30609), AIR
REGULATOR (30603), SEAL (30602), “O” RING (Y325-13) AND VALVE PLUG (30600).
Page 9
ACCES
41753-( ) 3-PIECE COLLET ASSEMBLY
ORIES
33226-( ) 3-PIECE COLLET ASSEMBLY
Ml0
43
, ASSEMBLY NO.
41753-I 1/8” 41750-1
41753-2
41753-3
41753-11
41753-12
COLLET NUT - 41751
COLLET BODY - 41752
3/8” - 24 THREAD
COLLET SUE COLLET
COLLET NUT DIA. - 3/4”
COLLET BODY DIA. - 21/32”
OVER ALL LENGTH - 2 1/4”
INSERT NO. ,
3/16 41750-2
1/4” 41750-3
3 mm 41750-11
6 mm 41750-12
44127-( ) ERICKSON 3-PIECE COLLET ASSEMBLY
1 COLLET 1 SUE
ASSEMBLY NO.
44127-1 3/32” - 1/6”
44127-2
44127-3
441274
44127-5
44127-6
44127-7
44127-8
44127-9
COLLETNUTCOLLET BODY - 44125 COLLET BODY DIA. - 43/64”
3/8” - 24 THREAD
1/8” - 5/32”
5/32” - 3/16”
3/16” - 7/32”
7/32” - 1/4”
1/4” - 9/32”
9/32” - 5/16”
5/16” - 11/32”
11/32” - 3/8”
COLLET NUT DIA. - 51/64”
OVER ALL LENGTH - 2 7/32”
I COLLET 1
INSERT NO. .
32966-l
32966-2
32966-3
329664
32966-5
32966-6
32966-7
32966-8
32966-9
COLLET SIZE COLLET
ASSEMBLY NO.
33226-4
33226-6
33226-8
COLLET NUT - 33220
COLLET BODY - 33216
CUP RING - 33221
NOSE RING - 33222
1/8” 31812-4
3/16” 31812-6
1/4” 31812-8
37292-( ) CONE WHEEL ADAPTER
INSERT NO.
COLLET NUT DIA. - 15/16”
COLLET BODY DIA. - 5/8”
OVER ALL LENGTH - 2”
3/8” - 24 THREAD
NOT SHOWN, WING NUT (2) Y89-4
QTY
NUMBER
1 30438
1 30602
1 30609
6 41520
1 41795
(INCLUDED WITH GUARD)
PART
DESCRIPTION
Bearing
Seal
Spring
Rotor Blade
Motor Oil
SERVICE KIT NO. 40102-I
QTY
1
1
1
1
2
PART
NUMBER
44933
Y65-7
Y325-7
Y325-13
Y32-30
DESCRIPTION
Screen
Bearing
“O” Ring
“O” Ring
“O” Ring
9
Page 10
TROUBLE SHOOTING
LISTED BELOW ARE SOME OF THE MOST COMMON CAUSES FOR THE GRINDER TO MALFUNCTION. MALFUNCTIONS BEYOND THE SCOPE OF THIS MANUAL
SHOULD BE BROUGHT TO THE ATTENTlON OF YOUR ARO REPRESENTATIVE OR RETURN THE TOOL TO THE FACTORY FOR REPAIR.
CONDITION
LOW SPEED AND
POWER OR GRINDER WILL NOT RUN.
THROTTLE VALVE
HARD TO OPERATE. PONENTS.
TOOL WILL NOT
SHUT OFF.
POSSIBLE CAUSE
1. INADEQUATE AIR SUPPLY.
2. AIR REGULATOR (30603) IMPROPERLY ADJUSTED.
3. AIR INLET OR EXHAUST SCREEN
PLUGGED.
4. OBSTRUCTION IN THROTTLE VALVE
OR VALVE NOT OPENING.
5. MOTOR NOT BEING PROPERLY LU-
BRICATED.
6. ROTOR BLADE IS MISSING, INCOR-
RECTLY INSTALLED, BADLY WORN
OR BEARING FAILURE.
1. DAMAGED VALVE PIN OR COM-
1. DAMAGED VALVE COMPONENTS.
CHECK AIR SUPPLY FOR CORRECT REGULATOR ADJUST-
1.
MENT (90 P.S.I.G. MAX. WHEN TOOL IS OPERATING).
CHECK REGULATOR ADJUSTMENT TO BE SURE OF MAXIMUM
2.
AIR FLOW.
3. INSPECT, WASH CLEAN.
DISASSEMBLE THROTTLE, CLEAN, INSPECT FOR OBSTRUC-
4.
TIONS OR DAMAGED PARTS.
APPLY 2 OR 4 DROPS OF SPINDLE OIL IN AIR INLET. RUN TOOL
5.
TO ALLOW OIL TO ENTER MOTOR - BE CERTAIN OILER IS
FULL OF OIL.
DISASSEMBLE MOTOR, CLEAN AND INSPECT FOR PROPER
6.
INSTALLATION, REPLACE BLADES AND/OR BEARINGS IF NECESSARY.
DISASSEMBLE VALVE COMPONENTS, INSPECT, REPLACE IF
1.
NECESSARY.
DISASSEMBLE VALVE COMPONENTS, INSPECT, REPLACE
1.
PARTS IF NECESSARY.
DIMENSIONAL DATA
CORRECTIVE ACTION
10
(49mm)
2-9/32 (APPROX.)
(56mm)
Page 11
Part of worldwide Ingersoll-Rand
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