Ingersoll-Rand 7870-F, 7873-F, 7872-F, 7871-F User Manual
SECTION
OPERATOR’S MANUAL
INCLUDING: OPERATION, INSTALLATION & MAINTENANCE
Tool Products
“2200” SERIES SHORT GRINDERS
MANUAL
Released: 5/79
Revised:
Form: 1558-2
Models: 7870-F-( ), 7871-F-( ),
7872-F and 7873-F.
READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
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58
3-10-95
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. 8188.1, can be purchased from:
American National Standards Institute, Inc.
1430 Broadway
New York, New York 10018
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Operate this tool at 90 p.s.i.g. (8.2 bar) maximum air pressure
at the air inlet of the tool.
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Disconnect air supply from tool before removing/installing
wire brush or rotary file or performing other maintenance procedures.
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Keep hands, clothing and long hair away from rotating end of
tool.
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Anticipate and be alert for sudden changes in motion during
start up and operation of any power tool.
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Never exceed rated r.p.m. of tool.
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Wear suitable eye and hearing protection while operating tool.
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Tool shaft can continue to rotate briefly after throttle is released.
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Do not lubricate tools with flammable or volatile liquids such as
kerosene, diesel or jet fuel.
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Use tool only for purposes for which it was intended.
Do not use excessive work pressure.
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Do not remove any labels. Replace any damaged label.
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Use only accessories recommended by ARO.
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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 dam-
age as well as tissue necrosis. Repetitive users of hand-held
tools who experience vibrations should closely monitor duration
of use and their physical condition.
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The use of other than genuine ARO replacement parts may
result in safety hazards, decreased tool perfomance and increased maintenance and may invalidate all warranties.
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ARO is not responsible for customer modification of tools for
applications on which ARO was not consulted.
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Tool maintenance and repair should be performed by author&d. trained, competent personnel. Consult your nearest
ARO authorized servicenter.
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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: (815) 672-0321, FAX: (615) 672-0601.
ARO Tool Products
Ingersoll-Rand Company
1725 U.S. No. 1 North l PO. Box 8000 l Southern Pines, NC 26388-8000
©1985 THE ARO CORPORATlON PRINTED IN USA
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
I
Wear hearing protection when
operating this tool.
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.
Do not overreach when operating
this tool. Keep body stance
balanced and firm.
Air powered tools can vibrate
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.
Operate at 90 p.s.i.g.
(6.2 bar/620 kPa)
maximum air pressure.
in
I
PN 48176-1 LABEL PN 49883 LABEL
(NON-EU
This label must appear on the tool at all times. If It Is
lost or damaged, a replacement label is available at
no cost.
WARNING = Hazards or unsafe practices which could result in severe personal injury, death or substantial
property damage.
CAUTION = Hazards or unsafe practices which could result in minor personal injury or product or property
damage.
NOTICE = Important installation, operation or maintenance information.
NOTICE
MODELS)
(-EU MODELS)
2
ROUTINE LUBRICATION REQUIREMENTS
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58
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
(29685) 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:
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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
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HOSE SIZE - 3/8” (10 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 re-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 beatings. Use 36460 lubricant for “0”
ring assembly. When assembling “0” rings or parts adjacent “0”
rings, care must be exercised to prevent damage to the rubber
sealing surfaces. A small amount of grease will usually hold steel
bails 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.
After disassembly 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 ARO
Description
Air Motor 29665 1 qt Spindle Oil
“0” Rings & Lip Seals 36460 4 oz. Stringy Lubricant
Gears and Bearings 33153 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 lubricate 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 TlMES
AIR TOOL INLET SIZE
Tool maintenance and repair shall be performed by authorized,
COMPRESSOR
DRAIN REGULARLY
MODEL IDENTIFICATION
with
Allow
The grinder models listed in the model identification table above are furnished with collet assembly 41753-o as standard equipment and are intended for use with
mounted
Wheels
and shall not be used
grinder. See ”Grinding Wheel Mounting lnstructions”, page 5. Other size collet inserts or other collet assemblies listed on page 11 can furnished
models.
The above listed grinder models that are furnished with optional arbor assembly 36934, must also be equipped with wheel guard 37900 (2" maximum wheel diameter).
Arbor assembly 38934 is for use
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. Bee “Grinding
Wheel Mounting Instructions”, page 5 and “Accessories’ section, page 11.
with
other type grinding wheels unless a proper wheel guard, recommended by the grinder manufacturer is attached to the
with
type 1 non-threaded grinding wheels only. See “Grinding Wheel Mounting Instructions”, page 5 and “Accessories”, page 11.
OPERATION
Safe and efficient operation of your ARO grinder can best be attained by observing proper operating, inspection and maintenance procedures.
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
Borne of the more common causes of wheel breakage are: Improper mounting of the wheels, Improper speeds, abusive operation and careless handling.
DO
Do always handle and store wheels In a careful manner (handle with due
regard, grlnding wheels are fragile).
Grlnding 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 “Accessories”
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 grlnding
Do always wear safety glasses or goggles when grinding.
Do always observe all safety rules when operating or handling portable
grinders.
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. lf 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. Tighten 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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