Rockwood 31818 User manual

4" AIR ANGLE GRINDER
INSTRUCTIONS
Item #31818

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The ROCKWOOD 4” AIR ANGLE GRINDER is a heavy-duty professional quality tool ruggedly designed
for many years of reliable service. A high-torque, linear, ball bearing supported air motor provides
smooth operation and long life. Speed is easily controlled with an infinitely progressive paddle control.
CONTENTS
(1) Air Angle Grinder
(1) 4” x 1/4” x 5/8” Grinding Wheel
(1) Auxiliary Handle
(1) Arbor Wrench
(1) Spindle Nut Spanner
(1) 1/4” MNPT, Male quick disconnect inlet fitting
SPECIFICATIONS
RPM: 10,000 free speed
Variable speed, ball bearing air motor
Air Consumption: 6 CFM [170 L/min] @ 90 PSI [6.2 bar]
Inlet thread size: 1/4” FNPT
Required Grinding Wheel: 4” diameter, 10,000 RPM
Arbor Diameter: 5/8” [16mm]

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READ INSTRUCTIONS
• Thoroughly read and understand these product instructions before using
this tool. Failure to follow all warnings can result in tool damage or serious
physical injury.
• Keep these product instructions for future reference.
HEALTH HAZARD!
• Dust and fine particles generated by grinding can contain hazardous or
toxic substances. Always wear a NIOSH-approved respirator while using
this grinder.
EYE INJURY HAZARD!
• Rapidly rotating surfaces can eject metal particles, dirt and debris at
high velocity. Always wear ANSI approved eye protection when operating
this tool.
HEARING DAMAGE HAZARD!
• This Pneumatic Tool emits high sound levels while operating.
Use ANSI approved ear protection when operating.
BURSTING HAZARD!
• Do not exceed 90 psi (6.2 bar) of tool inlet pressure. Permanent tool
damage and/or explosion could occur and cause personal injury.
DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury.
WARNING indicates a hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION used with the safety alert symbol, indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
NOTICE is used to address practices not related to personal injury.
SAFETY INFORMATION
The following explanations are displayed in this manual, on the labeling, and on all other information
provided with this product:

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INJURY HAZARD!
• This tool has high-speed, highly abrasive cutting surfaces which can quickly
cause severe injury. Keep fingers and hands away from moving parts when
operating. Wear thick, well-fitting work gloves and keep loose clothing,
sleeves, cords, jewelry and hair away from moving parts.
• This tool will eject sparks at high speed which can ignite flammable materi-
als or injure others nearby. Do not operate near flammable materials and
keep all persons and pets away from the work area.
• Do not force tool or exert excessive side forces on tool while in use as the
tool body can suddenly kick back or twist causing severe hand or wrist
injury. Grinding wheels can be damaged with excessive side force causing
them to disintegrate and eject sharp pieces at high velocity.
• Always make sure the workpiece is securely clamped or anchored to avoid
sudden movements which could result in injury.
• Frequently inspect Grinding wheel and tool condition. If cracks develop,
discontinue tool use immediately and replace damaged wheel. ONLY USE
replacement 4” Grinding Wheels rated for 10,000 RPM or greater use other-
wise severe injury or death can result in the event of wheel failure.
• Always disconnect tool from air supply when changing Grinding wheel to
prevent accidental tool starting and potential severe injury.
VIBRATION INJURY HAZARD!
• This tool will vibrate during use! Repeated exposure to vibration may cause
physical injury.

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SET-UP
• Thread the Auxiliary Handle onto the threaded hole at the upper left corner of the Grinder Body
and tighten it securely.
• Slip the Arbor Wrench in at a 45° angle in relation to the top of the Grinder Body, between two
of the guard cap screws and rotate the Spindle to align the flats with the Arbor Wrench (FIG 1).
• Place the upward beveled, raised center of the 4” Grinding Wheel over the threaded Arbor Spindle
while centering the 5/8” center hole over the 5/8” diameter offset Spindle Flange (FIG 2).
• Place the Spindle Nut over the threaded Arbor Spindle making sure the 5/8” diameter offset
faces inward and towards the Grinding Wheel hub (FIG 3).
• Thread the Spindle Nut onto the Arbor (making sure the 5/8” offset is centered in the Grinding
Wheel) until it is finger-tight (FIG 3).
FIG. 1
FIG. 2 FIG. 3
Arbor
Wrench
Flats
5/8” Center
✓
✓
✓
✓
Note
Bevel
“In”
✓
Spindle
Nut
✓

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• While holding the Spindle with the Arbor Wrench, set the pins of the Spindle Nut Spanner into
the holes of the Spindle Nut and tighten it securely (FIG 4).
• Using a good quality Teflon sealing tape (Not Included), thread the 1/4” MNPT, Male quick
disconnect inlet fitting into the air inlet.
CONNECTION
• Be sure that the air supply to the tool is clean and dry. Moisture in the supply line will quickly
damage the motor and valves.
• A minimum 3/8” I.D. air line should be used for optimal performance.
OPERATION
• Connect air supply, move throttle safety lever forward and depress Paddle to begin rotating
action. Speed is regulated by pressure applied to the Paddle.
MAINTENANCE
• Add several drops of air tool oil before each use by dropping directly into the air inlet.
• If tool is to be unused for an extended period, add 10 drops of air tool oil directly to the air
inlet, rotate the tool motor by hand several times to distribute the oil throughout the motor and
gearbox then store the tool, handle up.
FIG. 4
Arbor Wrench
Spindle Nut
✓
✓
Spindle Nut Spanner
✓

To order parts and supplies: 800.343.9353 >> eastwood.com 7
Tool Doesn’t
Respond
to Trigger
Depression
Insufficient
Volume of
Air (CFM) to
Operate Tool
Verify sufficient air supply to tool
(6 CFM @ 90 PSI minimum requirement).
Moisture
or Other
Contamination
in Air Supply
Check for moisture in air line and tool air inlet.
Tool
Performance
is Slow of
Sluggish
Insufficient
Volume of
Air (CFM) to
Operate Tool
Verify sufficient air supply to tool
(6 CFM @ 90 PSI minimum requirement).
Moisture
or Other
Contamination
in Air Supply
Check for moisture in air line and tool air inlet.
Air Motor
is Lacking
Lubrication
Stop use immediately and add air tool oil directly
to air inlet.
Tool is
Excessively
Noisy/Emits
High Pitched
Sound
Air Motor
is Lacking
Lubrication
Stop use immediately and add air tool oil directly
to air inlet.
Tool Vibrates
Excessively
During Use
Out of Balance
Condition from
Damaged
Grinding Wheel
Stop use immediately, check for damage and
replace Grinding Wheel.
Loose Spindle
Nut Tighten loose Spindle Nut.
TROUBLESHOOTING

© Copyright 2017 Easthill Group, Inc. 5/17 Instruction item #31818Q Rev 1
If you have any questions about the use of this product, please contact
The Eastwood Technical Assistance Service Department: 800.343.9353 >> email: [e-mail]
PDF version of this manual is available online >> eastwood.com/31818manual
The Eastwood Company 263 Shoemaker Road, Pottstown, PA 19464, USA
US and Canada: 800.343.9353 Outside US: 610.718.8335
Fax: [phone] eastwood.com
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#70491 Eastwood Industrial Air Hose, 3/8” x 25’
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