SECTION
MANUAL
Released:
Revised:
Form:
M10
15
)
OPERATOR’S MANUAL
INCLUDING:ĂOPERATION,ĂINSTALLATIONĂ&ĂMAINTENANCE
10/81
1-20-00
1956-2
60,000 R.P.M. PENCIL GRINDER
Models: 7978–( )
WARNING
READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
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.
Allow only people who have received training in ‘‘proper grind-
er operation” to operate grinder.
Do not remove any labels. Replace any damaged label.
Use only accessories recommended by ARO.
•
•
American National Standards Institute, Inc.
1430 Broadway
WARNING
New York, New York 10018
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.
WARNING
•
•
•
•
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
mounted wheel or performing other maintenance procedures.
Keep hands, 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.
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 re-
leased.
Do not lubricate tools with flammable or volatile liquids such as
kerosene, diesel or jet fuel.
Use tool only for purposes for which it was intended.
Never use mounted stone or carbide burr with speed rating
lower than r.p.m. rating of tool.
NOTICE
•
The use of other than genuine ARO replacement parts may
result in safety hazards, decreased tool performance and in-
creased 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 autho-
rized, 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 D P.O. Box 8000 D Southern Pines, NC 28388–8000
E2000 INGERSOLL–RAND COMPANY D PRINTED IN U.S.A.
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M10
15
ROUTINE LUBRICATION REQUIREMENTS
Be sure the tool is receiving adequate lubrication, as failure to lu-
bricate can create hazardous operating conditions resulting from
excessive wear.
Lack of or an excessive amount of lubrication will affect the perfor-
mance and life of this tool. Use only recommended lubricants at
below time intervals:
Be sure that the air supply lines and connectors are of proper size
to provide a sufficient quantity of air to the tool.
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.
Tool maintenance and repair shall be performed by authorized,
trained, competent personnel. Tools, hose and fittings shall be re-
placed if unsuitable for safe operation and responsibility should
be assigned to be sure that all tools requiring guards or other safe-
ty devices shall be kept in legible condition. Maintenance and re-
pair 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.
EVERY 40 HOURS OF TOOL OPERATION – Flush tool with a
solution of three (3) parts cleaning solvent to one (1) part spindle
oil.
AIR SUPPLY REQUIREMENTS
For maximum operating efficiency, the following air supply specifi-
cations should be maintained to this air tool:
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 sol-
vent, 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.
•
•
•
•
AIR PRESSURE – 90 p.s.i.g. (6.2 bar)
AIR FILTRATION – 50 micron
LUBRICATED AIR SUPPLY
HOSE SIZE – 3/16” (5 mm) I.D.
An AROR model 128121–800 air line FILTER/REGULATOR/LU-
BRICATOR (F.R.L.) is recommended to maintain the above air
supply specifications.
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.
RECOMMENDED LUBRICANTS
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:
When replacement parts are necessary, consult drawing contain-
ing 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 pres-
sure (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.
Where Used
Air Motor
‘‘O” Rings
Bearings
ARO Part #
29665
Description
1 qt Spindle Oil
4 oz. Stringy Lubricant
5 lb. ``EP" - NLGI #1 Grease
36460
33153
MOUNTING INSTRUCTIONS
•
•
Be sure collet is in good condition and properly secured to
grinder spindle.
Insert shaft of mounted wheel to the full depth of gripping jaws
of collet. At least one–half of shaft length shall be inserted into
collet jaws.
MAIN LINES 3 TIMES
AIR TOOL INLET SIZE
•
Be sure mounted stone or carbide bur is compatible with the
speed of the grinder.
TO
AIR
SYSTEM
CAPACITIES (MAXIMUM)
TO
AIR
TOOL
•
•
Carbide Bur – 1/4”
Mounted Stone – 1/4”
INSPECTION, MAINTENANCE AND INSTALLATION
LUBRICATOR
REGULATOR
FILTER
Disconnect air supply from the tool or shut off air supply and ex-
haust (drain) line of compressed air before performing mainte-
nance or service to the tool.
BRANCH LINE 2 TIMES
AIR TOOL INLET SIZE
It is important that the tools be serviced and inspected at regular
intervals for maintaining safe, trouble–free operation of the tool.
COMPRESSOR
DRAIN REGULARLY
(TPD905–1)
3
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MODEL IDENTIFICATION
MODEL HOUSING
NUMBER
MOTOR
COLLET
COLLET
ASSEMBLY ASSEMBLY CAPACITY
7978
46114
46114
46114
49914
46112
46119–2
46119–3
46119–1
46119–3
1/8”
7978–1
7978–2
7978–EU
46112–1
46112–2
46112–1
3 mm
3/32”
3 mm
MODELS WITH –EU SUFFIX ARE ‘‘EC” COMPLIANT MODELS.
DISASSEMBLY/ASSEMBLY INSTRUCTIONS
Disconnect air supply from tool or shut off air supply and drain line
tool are as follows:
of compressed air before performing maintenance or service to
tool.
THROTTLE SECTION
Before starting to disassemble or assemble this tool (any part or
completely), be sure to read ‘‘Inspection, Maintenance and Instal-
lation” section.
Remove hose assembly from tool. Using 11/16” diameter blocks,
clamp housing (46114 or 49914) in a vise (see grip area below)
and unthread throttle section from housing. NOTE: Thread adhe-
sive has been applied to these threads.
To minimize the possibility of parts damage and for convenience,
the steps for disassembly or assembly listed on the following
pages are recommended.
MOTOR SECTION
After removal of throttle section, motor assembly can be removed
from the housing.
The basic sections and instructions for removing them from the
(ATP–59)
THROTTLE SECTION
to clean screen. Whenever a part containing ‘‘O” rings has
been removed from the tool, it is recommended the ‘‘O” rings
be replaced with new ones before assembling the part to the
tool. Lubricate all ‘‘O” rings with ARO 36460 lubricant at as-
sembly.
DISASSEMBLY
_
_
_
_
Remove throttle as outlined above.
Remove pipe fitting (Y43–41–C) from throttle.
Remove snap ring (Y110–5).
Remove sleeve (46106) for access to two ‘‘O” rings
(Y325–10) and ‘‘O” ring (Y325–12).
_
Assemble two ‘‘O” rings (Y325–10) and ‘‘O” ring (Y325–12) to
throttle.
_
_
Assemble ‘‘O” ring (Y325–13) to throttle.
Slide sleeve (46106) onto throttle and secure with snap ring
(Y110–5).
ASSEMBLY
_
NOTE: Throttle contains an internal filter screen. Wash throttle
thoroughly in clean solvent and blow air backward thru throttle
_
Assemble pipe fitting (Y43–41–C) to end of throttle.
4
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M10
15
MOTOR SECTION
_
Assemble end plate (46108), with spacer (46103), to rotor. Us-
ing brass blocks in a vise, as for disassembly, clamp on rotor
and assemble collet body to rotor (apply thread adhesive to
threads) and tighten to 20 – 25 in. lbs torque.
Coat i.d. of cylinder with spindle oil and assemble to rotor. As-
semble blades to rotor.
DISASSEMBLY
_
_
Remove motor assembly as outlined on page 4.
Grasp cylinder in one hand and, with the same hand, hold a
punch against the rear of the rotor. Tap punch to remove bear-
ing (46110) and end plate (46107) from rotor. Remove cylinder
and blades from rotor.
Using brass blocks (1/4” diameter) in a vise; clamp on rotor
and remove collet body, bearing, end plate and spacer from
rotor.
_
_
_
_
_
Pack bearing (46110) with ARO 33153 grease and assemble
to end plate (46107).
Assemble end plate to rotor. Push rotor to rear and press inner
race of bearing (46110) to remove axial play.
Be sure rotor does not bind. If rotor binds, tap rear of rotor light-
ly with punch as for motor disassembly.
Assemble motor assembly to housing and assemble throttle
to housing using thread adhesive on threads and tighten se-
curely.
_
_
ASSEMBLY
Pack bearing (46109) with ARO 33153 grease and assemble
to end plate (46108), with shielded side out.
MOTOR ASSEMBLY 46112–( )
(ATP–60)
37738 WRENCH (FURNISHED WITH TOOL)
OPTIONAL FILTER ASSEMBLY (1/4”)
(ATP–56)
5
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TYPICAL CROSS SECTION OF TOOL
(ATP–57)
DIMENSIONAL DATA
(ATP–58)
6
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M10
15
7
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PN 49999–247
04607560
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