OPERATOR'S MANUAL
4 in. (100 mm) Angle Grinder
Model AG400 / Double Insulated
SPECIFICATIONS:
Grinding Wheel Capacity
Rating
4 in. (100 mm)
120 volts, 60Hz, AC only
11,000 RPM
No Load Speed
Amperes
4.3 Amperes
Net Weight
4.0 lbs. (1.8 kg.)
THANK YOU FOR BUYING A RYOBI ANGLE GRINDER.
YournewanglegrinderhasbeenengineeredandmanufacturedtoRyobi'shighstandardfordependability, easeofoperation,
and operator safety. Properly cared for, it will give you years of rugged, trouble-free performance.
CAUTION: Carefully read through this entire operator's manual before using your new angle grinder.
Pay close attention to the Rules for Safe Operation, Warnings, and Cautions. If you use your grinder properly and only for
what it is intended, you will enjoy years of safe, reliable service.
Please fill out and return the Warranty Registration Card so that we can be of future service to you.
Thank you again for buying Ryobi tools.
SAVE THIS MANUAL FOR FUTURE REFERENCE
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RULES FOR SAFE OPERATION
The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols, and the
explanations with them, deserve your careful attention and understanding. The safety warnings do not by
themselves eliminate any danger. The instructions or warnings they give are not substitutes for proper
accident prevention measures.
SYMBOL
MEANING
SAFETY ALERT SYMBOL:
Indicates danger, warning, or caution. May be used in conjunction with other symbols or pictographs.
DANGER: Failure to obey a safety warning will result in serious injury to yourself or to others. Always
follow the safety precautions to reduce the risk of fire, electric shock and personal injury.
WARNING:Failuretoobeyasafetywarningcanresultinseriousinjurytoyourselfortoothers.Always
follow the safety precautions to reduce the risk of fire, electric shock and personal injury.
CAUTION: Failure to obey a safety warning may result in property damage or personal injury to
yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock and
personal injury.
NOTE:
Advises you of information or instructions vital to the operation or maintenance of the equipment.
DOUBLE INSULATION
IMPORTANT
Your Ryobi power tool is double insulated. This means you
areseparatedfromthetool'selectricalsystembytwocomplete
sets of electrical insulation. This extra layer of insulation is
intended to protect the user from electrical shock due to a
break in the wiring insulation. All exposed metal parts are
isolated from the internal metal motor components with
protecting insulation. Double insulated tools do not need to
be grounded.
Servicing of a tool with double insulation requires extreme
care and knowledge of the system and should be performed
onlybyaqualifiedservicetechnician.Forservicewesuggest
you return the tool to your nearest RYOBI AUTHORIZED
SERVICE CENTER for repair. When servicing use only
identical Ryobi replacement parts.
WARNING:
Do not attempt to operate this tool until you have read
thoroughly and understand completely all instructions,
safety rules, etc. contained in this manual. Failure to
comply can result in accidents involving fire, electric
shock, or serious personal injury. Save operator's manual
and review frequently for continuing safe operation, and
instructing others who may use this tool.
WARNING:
The double insulated system is intended to protect the
user from shock resulting from a break in the tool's
internal wiring. Observe all normal safety precautions
related to avoiding electrical shock.
WARNING:
WEAR YOUR
The operation of any angle grinder can result in foreign objects being thrown into your eyes,
which can result in severe eye damage. Before beginning power tool operation, always wear
safety goggles or safety glasses with side shields and a full face shield when needed. We
recommend Wide Vision Safety Mask for use over eyeglasses or standard safety glasses with
side shields. Always wear eye protection which is marked to comply with ANSI Z87.1.
SAFETY GLASSES
FORESIGHT IS BETTER
THAN NO SIGHT
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RULES FOR SAFE OPERATION
of inattention while operating power tools may result
in serious personal injury.
WARNING:
Read and understand all instructions. Failure to
follow all instructions listed below, may result in elec-
tric shock, fire and/or serious personal injury.
■ Dress properly. Do not wear loose clothing or
jewelry. Contain long hair. Keep your hair, cloth-
ing, and gloves away from moving parts. Loose
clothes, jewelry, or long hair can be caught in moving
parts.
SAVE THESE INSTRUCTIONS
■ Avoid accidental starting. Be sure switch is off be-
fore plugging in. Carrying tools with your finger on
the switch or plugging in tools that have the switch on
invites accidents.
Work Area
■ Keep your work area clean and well lit. Cluttered
benches and dark areas invite accidents.
■ Do not operate power tools in explosive atmo-
spheres, such as in the presence of flammable
liquids, gases, or dust. Power tools create sparks
which may ignite the dust or fumes.
■ Remove adjusting keys or wrenches before turn-
ing the tool on. A wrench or a key that is left at-
tached to a rotating part of the tool may result in
personal injury.
■ Keep bystanders, children, and visitors away
while operating a power tool. Distractions can
cause you to lose control.
■ Do not overreach. Keep proper footing and bal-
ance at all times. Proper footing and balance en-
ables better control of the tool in unexpected situa-
tions.
Electrical Safety
■ Double insulated tools are equipped with a po-
larized plug (one blade is wider than the other).
This plug will fit in a polarized outlet only one
way. If the plug does not fit fully in the outlet,
reverse the plug. If it still does not fit, contact a
qualified electrician to install a polarized outlet.
Do not change the plug in any way. Double insu-
■ Use safety equipment. Always wear eye protec-
tion. Dust mask, non-skid safety shoes, hard hat, or
hearing protection must be used for appropriate con-
ditions.
Tool Use and Care
■ Use clamps or other practical way to secure and
support the workpiece to a stable platform. Hold-
ing the work by hand or against your body is un-
stable and may lead to loss of control.
lation
eliminates the need for the three wire
grounded power cord and grounded power supply
system.
■ Do not force tool. Use the correct tool for your
application. The correct tool will do the job better
and safer at the rate for which it is designed.
■ Do not use tool if switch does not turn it on or
off.Any tool that cannot be controlled with the switch
is dangerous and must be repaired.
■ Disconnect the plug from the power source be-
fore making any adjustments, changing acces-
sories, or storing the tool. Such preventive safety
measures reduce risk of starting the tool acciden-
tally.
■ Store idle tools out of reach of children and other
untrained persons. Tools are dangerous in the
hands of untrained users.
■ Maintain tools with care. Keep cutting tools sharp
and clean. Properly maintained tools with sharp
cutting edges are less likely to bind and are easier
to control.
■ Avoid body contact with grounded surfaces such
as pipes, radiators, ranges and refrigerators.
There is an increased risk of electric shock if your body
is grounded.
■ Don't expose power tools to rain or wet condi-
tions. Water entering a power tool will increase the
risk of electric shock.
■ Do not abuse the cord. Never use the cord to
carry the tools or pull the plug from an outlet.
Keep cord away from heat, oil, sharp edges or
moving parts. Replace damaged cords immedi-
ately. Damaged cords increase the risk of electric
shock.
■ When operating a power tool outside, use an out-
door extension cord marked “W-A” or “W”. These
cords are rated for outdoor use and reduce the risk of
electric shock.
Personal Safety
■ Check for misalignment or binding of moving
parts, breakage of parts, and any other condi-
tion that may affect the tool's operation. If dam-
aged, have the tool serviced before using. Many
accidents are caused by poorly maintained tools.
■ Stay alert, watch what you are doing and use
common sense when operating a power tool. Do
not use tool while tired or under the influence of
drugs, alcohol, or medication. A moment
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RULES FOR SAFE OPERATION
■ Use only accessories that are recommended by the
■ Dust and waste materials should not be allowed
to build up in the workshop. Hot metal sparks could
start a fire.
manufacturer for your model. Accessories that may
be suitable for one tool, may become hazardous when
used on another tool.
■ Do not enlarge or alter the center hole of the grinding
wheel as this could result in breaking it.
Service
■ Use only the normal grinder surface. Never use the
■ Tool service must be performed only by qualified
repair personnel. Service or maintenance performed
by unqualified personnel could result in a risk of injury.
side or upper surfaces for cutting.
■ Keep the tool and its handle dry, clean, and free
from oil and grease. Always use a clean cloth when
cleaning. Never use brake fluids, gasoline, petroleum-
based products, or any strong solvents to clean your
tool.
■ When servicing a tool, use only identical replace-
ment parts. Follow instructions in the Maintenance
section of this manual. Use of unauthorized parts or
failure to follow Maintenance Instructions may create
a risk of electric shock or injury.
Additional Rules for Safe Operation
■ Know your power tool. Read operator's manual care-
fully. Learn its applications and limitations as well as
the specific potential hazards related to this tool. Fol-
lowingthisrulewillreducetheriskofelectricshock,fire,
or serious injury.
Specific Safety Rules for Grinders
■ Always use proper guard with grinding wheel. A
guard protects operator from broken wheel fragments.
■ Accessories must be rated for at least the speed
recommended on the tool warning label. Wheels
and other accessories running over rated speed can
fly apart and cause injury.
■ Hold tool by insulated gripping surfaces when per-
forming an operation where the tool may contact
hidden wiring or its own cord. Contact with a “live”
wire will make exposed metal parts of the tool “live”
and shock the operator.
■ Always wear safety glasses with side shields. Ev-
eryday eyeglasses have only impact resistant lenses;
they are NOT safety glasses.
■ Protect your lungs. Wear a face or dust mask if the
operation is dusty.
■ Protect your hearing. Wear hearing protection during
extended periods of operation.
■ Grinding wheel and guard must be securely
attached as described in this operating manual before
connecting the grinder to a power source.
■ Inspect tool cords periodically and if damaged, have
repaired at your nearest authorized service center. Stay
constantly aware of cord location.
■ Grinding wheels must be stored in a dry place.
■ Before attaching the grinding wheel, inspect it for
visible defects. If cracked, chipped, or warped, do not
install it.
■ Do not overtighten the clamp nut on the grinding
wheel. Excessive tightening can cause the wheel to
crack during operation
■ Make sure that the guard is in good condition and
securely installed before operating grinder.
■ Do not clamp the grinder in a vise or use as a
fixed grinder.
■ Never turn on the grinder with the grinding wheel
or any rotating parts touching the workpiece.
■ Use only grinding wheels in compliance with ANSI
standard B7.1 and rated greater than 11,000 RPM.
■ Do not use the grinder if the disc flange or clamp
nut is missing or if the spindle is bent.
■ Always hold the grinder securely with two hands
while working and at all times when it is running.
■ Never cover the air vents in the motor housing
with your hands while operating the grinder.
■ Hold the tool away from your body while it is
running. Keep your hands away from the abrasive
attachments.
■ Check damaged parts. Before further use of the tool,
a guard or other part that is damaged should be
carefully checked to determine that it will operate
properly and perform its intended function. Check for
alignment of moving parts, binding of moving parts,
breakage of parts, mounting, and any other conditions
that may affect its operation. A guard or other part that
is damaged should be properly repaired or replaced by
an authorized service center. Following this rule will
reduce the risk of electric shock, fire, or serious injury.
■ Do not abuse cord. Never carry tool by cord or yank
it to disconnect from receptacle. Keep cord from
heat, oil and sharp edges. Following this rule will
reduce the risk of electric shock or fire.
■ Make sure your extension cord is in good condi-
tion. Whenusinganextensioncord, besuretouseone
heavy enough to carry the current your product will
draw. A wire gage size (A.W.G.) of at least 16 is
recommended for an extension cord 100 feet or less in
length. A cord exceeding 100 feet is not recommended.
If in doubt, use the next heavier gage. The smaller the
gage number, the heavier the cord. An undersized cord
will cause a drop in line voltage resulting in loss of power
and overheating.
Page 5
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RULES FOR SAFE OPERATION
■ Inspect for and remove all foreign objects from
workpiece before grinding. Following this rule will
reduce the risk of serious personal injury.
WARNING:
Some dust created by power sanding, sawing, grinding,
drilling, and other construction activities contains
chemicals known to cause cancer, birth defects or
other reproductive harm. Some examples of these
chemicals are:
■ Drugs, Alcohol, Medication. Do not operate tool
while under the influence of drugs, alcohol, or any
medication. Following this rule will reduce the risk of
electric shock, fire, or serious injury.
■ Keep hands away from grinding area. Following this
• lead from lead-based paints,
• crystalline silica from bricks and cement and other
masonry products, and
• arsenic and chromium from chemically-treated
lumber.
rule will reduce the risk of serious personal injury.
■ Save these instructions. Refer to them frequently
and use them to instruct others who may use this tool.
If you loan someone this tool, loan them these instruc-
tions also.
Your risk from these exposures varies, depending on
how often you do this type of work. To reduce your
exposure to these chemicals: work in a well ventilated
area, and work with approved safety equipment, such
as those dust masks that are specially designed to filter
out microscopic particles.
SAVE THESE INSTRUCTIONS
SYMBOLS
Important: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper
interpretation of these symbols will allow you to operate the tool better and safer.
SYMBOL
NAME
DESIGNATION/EXPLANATION
V
Volts
Voltage
A
Amperes
Hertz
Current
Hz
W
Frequency (cycles per second)
Watt
Power
Time
min
Minutes
Alternating Current
No Load Speed
Type or a characteristic of current
Rotational speed, at no load
n
0
Designates Double Insulated
Construction tools
Class II Construction
Revolutions, strokes, surface speed,
orbits etc. per minute
.../min
Revolutions or Reciprocation Per Minute
Indicates danger, warning or caution.
It means attention!!! Your safety is
involved.
Safety Alert Symbol
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ELECTRICAL
EXTENSION CORDS
ELECTRICAL CONNECTION
When using a power tool at a considerable distance from the
power source, use an extension cord heavy enough to carry
the current that the tool will draw. An undersized extension
cord will cause a drop in line voltage, resulting in a loss of
power and causing the motor to overheat. Use the chart
provided below to determine the minimum wire size required
in an extension cord. Only round jacketed cords listed by
Underwriter's Laboratories (UL) should be used.
Your grinder has a precision built electric motor. It should be
connected to a power supply that is 120 volts, 60Hz, AC
only (normal household current). Do not operate this tool
on direct current (DC). A substantial voltage drop will cause
a loss of power and the motor will overheat. If your tool does
not operate when plugged into an outlet, double check the
power supply.
Length of Extension Cord
Wire Size (A.W.G.)
CAUTION:
Keep the cord away from the cutting area and position
the cord so that it will not be caught on lumber, tools, or
other objects during cutting.
Up to 50
51 to 100
16
14
When working with the tool outdoors, use an extension cord
that is designed for outside use. This is indicated by the
letters WA on the cord's jacket.
Before using an extension cord, inspect it for loose or
exposed wires and cut or worn insulation.
UNPACKING
With the exception of the side handle and grinding wheel,
youranglegrinderhasbeenshippedcompletelyassembled.
PACKING LIST
Angle Grinder With Guard
Grinding Wheel
■ Carefully remove the grinder and accessories from the
box. Make sure that all items listed in the packing list are
included.
Side Handle
Wrench
■ Inspect grinder carefully to make sure no breakage or
Operator's Manual
Warranty Registration Card
damage has occurred during shipping.
■ If any parts are damaged or missing, contact your nearest
Ryobi dealer to obtain replacement parts before
attempting to operate grinder.
WARNING:
■ Do not discard the packing material until you have
carefully inspected and satisfactorily operated grinder.
If any parts are missing, do not operate your grinder until
the missing parts are replaced. Failure to do so could
result in possible serious personal injury.
Page 7
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FEATURES
KNOW YOUR ANGLE GRINDER
Before attempting to use your grinder, familiarize yourself
with all operating features and safety requirements.
See Figure 1.
Side Handle
The side handle provided, stabilizes your grinder and must
be used during all grinding operations. In addition to
maintaining safe control during use, the side handle also
provides convenient ease of operation for the operator.
Makesureallgrindingwheels andrecommendedaccessories
are in accordance with listed specifications for this tool. For
example, do not use grinding wheels that are rated at less
than 11,000 RPM.
Spindle Lock Button
The spindle lock button secures the spindle so that only one
wrench is needed to change the grinding wheel.
Guard
A protective guard has been provided on your grinder. It
deflects sparks and metal chips during use.
Switch Button
Your grinder has a conveniently located switch. It also has a
lock-on feature that allows the grinder to be locked in the on
position when continuous operation for extended periods of
time is required.
Heavy Duty Motor
Your Ryobi AG400 Angle Grinder has a powerful motor, with
sufficient power to handle tough grinding jobs that require
heavy duty performance.
APPLICATIONS
(Use only for the purposes listed below)
■ Grinding metals.
■ Preparing surfaces to be welded.
■ Grinding welds.
SWITCH BUTTON
SPINDLE
LOCK BUTTON
SIDE HANDLE
WRENCH
GUARD
GRINDING WHEEL
Fig. 1
WARNING:
Do not allow familiarity with your grinder to make you
careless. Remember that a careless fraction of a second
is sufficient to inflict severe injury.
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ASSEMBLY
WARNING:
Your grinder should never be connected to power supply
when you are assembling parts, making adjustments,
installingorremovinggrindingwheels,orwhennotinuse.
Disconnectingyourgrinderwillpreventaccidentalstarting
that could cause serious injury.
GEAR
HOUSING
INSTALLING THE SIDE HANDLE
See Figure 2.
■ UNPLUG YOUR GRINDER.
WARNING:
Failure to unplug your grinder could result in accidental
starting causing serious injury.
SIDE
HANDLE
Fig. 2
TO
TIGHTEN
■ Install the side handle by screwing it into the side of the
WRENCH
gear housing.
Note: The handle can be installed on either the left or
right side of the grinder, depending on operator prefer-
ence. It must always be used to prevent loss of control
and possible serious injury.
TO
LOOSEN
CLAMP
NUT
■ Tighten side handle securely.
GRINDING
WHEEL
INSTALLING THE GRINDING WHEEL
See Figure 3.
■ UNPLUG YOUR GRINDER.
WARNING:
Failure to unplug your grinder could result in accidental
starting causing serious injury.
DISC
FLANGE
SPINDLE
■ Your grinder is shipped with the disc flange and clamp
nut attached to the spindle.
■ Depress spindle lock button and rotate clamp nut until
spindle locks.
■ Loosen and remove clamp nut from spindle. Do not
remove disc flange.
FLAT(S)
■ Make sure flats on the bottom of disc flange are engaged
with flats on spindle.
SPINDLE
LOCK BUTTON
■ Place the grinding wheel over the spindle with the
Fig. 3
concave side of the wheel facing up.
■ Thread the clamp nut on the spindle with the flat side of
the nut facing up. Fit the raised, small diameter portion
of the clamp nut into the hole in the grinding wheel and
finger tighten.
WARNING:
Always install grinding wheel with the depressed center
against the disc flange as shown in figure 3. Failure to do
so will cause the grinding wheel to crack when tightening
the clamp nut. This could result in serious personal injury
because of loose particles breaking off and being thrown
from the grinder. Never use a grinding wheel with a
mounting hole larger than 5/8". Do not overtighten.
■ Depress the spindle lock button and rotate the wheel
clockwise until the spindle locks in position.
■ Securely tighten the clamp nut with the wrench provided.
Do not overtighten.
Page 9
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ADJUSTMENTS
A
WARNING:
Before connecting your grinder to power supply, always
check to be sure switch is not in lock-on position. Failure
to do so could result in accidental starting of your grinder
resulting in possible serious injury.
GUARD LOCATION
The guard on your grinder should be correctly installed
depending on which side the handle is mounted. Never use
yourgrinderwithouttheguardcorrectlyinplace. Figures
4, 5, and 6 show correct and incorrect locations of the guard.
CORRECT
LOCATION OF GUARD IS
BETWEEN POINTS A AND B
Fig. 4
WARNING:
B
Never place the guard so that it is on front of the grinder as
showninfigure6. Thiscouldresultinseriousinjurybecause
sparks and loose particles thrown from the grinding wheel
would be directed toward the operator. Always place the
guard in the correct location as shown in figures 4 and 5.
OPERATION
WARNING:
■ Always wear safety glasses and keep guard in place
when grinding.
Fig. 5
■ Hot metal sparks from metal grinding can cause a fire.
Avoid spark contact with flammable materials such as
saw dust or clothing.
INCORRECT
LOCATION OF GUARD
■ Grinding wheels must be free of fissures and cracks.
Fissures and cracks can cause a grinding wheel to
shatter resulting in possible serious injury.
Thoroughly inspect a new grinding wheel before it is
installed on the grinder.
1. Use a wooden hammer for the inspection.
2. Using the hammer, lightly tap all around the wheel,
carefully listening to the resulting sounds.
3. Any places with fissures or cracks will result in a
different sound.
Do not use a wheel containing fissures or cracks.
When installing a new grinding wheel, a no load
revolution test of approximately one minute must be
carried out with the grinding wheel facing a safe
direction, i.e. away from people or objects.
Fig. 6
WARNING:
DANGER:
Do not attempt to operate this tool until you have read
thoroughly and understand completely all instructions,
safety rules, etc. contained in this manual. Failure to
comply can result in accidents involving fire, electric
shock, or serious personal injury. Save operator's manual
and review frequently for continuing safe operation, and
instructing others who may use this tool.
Never attach a wood cutting or carving blade of any
type to this angle grinder. It is only designed for
grinding metal. Use for any other purpose is not
recommended and creates a hazard which will result in
serious injury.
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OPERATION
(O) OFF
(I) ON
CAUTION:
Never cover air vents. They must always be open for
proper motor cooling.
0
SWITCH BUTTON
See Figure 7.
To turn your grinder on, push the switch button forward.
Release the button to turn the grinder off.
SWITCH
BUTTON
LOCK-ON FEATURE
OFF
See Figure 7.
ON
Your grinder has a lock-on feature that is convenient when
continuousoperationforextendedperiodsoftimeisrequired.
To lock-on, push the switch button forward and press the
front portion of the button in toward the grinder. To release
the lock-on, press in on the rear portion of the button. Button
will then disengage from the locked position.
SWITCH BUTTON
GRINDING
See Figure 8.
Always carefully select and use grinding wheels that are
recommended for the material to be ground. Make sure that
the minimum operating speed of the grinding wheel selected
isnotlessthan11,000rpm.Thegrindingwheelprovidedwith
your grinder is suitable for grinding welds, preparing sur-
faces to be welded, grinding structural steel, and grinding
stainless steel.
TO
LOCK-ON
Fig. 7
Secure all work before beginning a grinding operation.
Secure small workpieces in a vise or clamp to a workbench.
DANGER:
0
Never use your grinder with the guard removed. It has
been designed for use only with the guard installed.
Attempting to use grinder with guard removed will result
in loose particles being thrown against the operator
resulting in serious personal injury.
5° TO 15°
Fig. 8
15 degrees and continuously moving at a steady, consistent
pace. Move the grinder back and forth or up and down over
the work area. Keep the grinder moving so that an excessive
amount of material is not removed from one area. If the
grinder is held in one spot too long, it will gouge and cut
grooves in the workpiece. If the grinder is held at too sharp
an angle, it will also gouge the workpiece because of
concentration of pressure on a small area.
WARNING:
Never use your grinder without wearing eye protection.
Following this rule will reduce the risk of serious personal
injury.
The key to efficient operation begins by controlling the
pressure and surface contact between the grinding wheel
and workpiece. Flat surfaces are ground at an acute angle,
normally between 5 to 15 degrees.
Usejustenoughpressuretokeepthegrinderfromchattering
or bouncing. Heavy pressure will decrease its speed and put
a strain on the motor. Normally the weight of the tool alone
is adequate for most grinding jobs. Use light pressure when
grinding jagged edges or loose bolts where there is the
potential for the grinder to snag on the metal edge.
Formaximumcontrol, holdthegrinderinfrontandawayfrom
you with both hands, keeping the grinding wheel clear of the
workpiece. Start your grinder and let the motor and grinding
wheel build up to full speed. Gradually lower grinder until the
grinding wheel contacts the workpiece.
Lift the grinder away from the workpiece before turning your
grinder off.
For best results keep the grinder tilted at an angle from 5 to
Page 11
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MAINTENANCE
WARNING:
When servicing use only identical Ryobi replacement parts. Use of any other parts may create a hazard or cause product
damage.
GUARD REPLACEMENT
See Figure 9.
TO
TIGHTEN
After extended use, the guard may become worn and need
adjustments or replacing. If you drop your grinder and
damage the guard it may also be necessary for you to
replace it.
WRENCH
TO
LOOSEN
CLAMP
NUT
PROCEED AS FOLLOWS WHEN REPLACEMENT IS
REQUIRED:
GRINDING
WHEEL
■ UNPLUG YOUR GRINDER.
WARNING:
Failure to unplug your grinder could result in accidental
starting causing serious injury.
DISC
FLANGE
GUARD
■ Remove and reassemble parts as shown in figure 9.
■ Depress spindle lock button and rotate clamp nut until
spindle locks.
■ Using the wrench provided, loosen and remove clamp
CLAMP
SCREW
nut from spindle.
■ Remove grinding wheel and disc flange.
SPINDLE
■ Using a screwdriver, loosen the clamp screw until the
guard can be adjusted or removed.
■ If you are making adjustments, rotate the guard to its
correct position as shown in figures 4, 5, and 9, then
retighten clamp screw securely. Never use your grinder
without the guard in place and properly adjusted.
See Figures 4, 5, and 6.
FLAT(S)
BEARING CAP
Note: Be sure the tabs on the guard are seated in the
groove in the bearing cap.
SPINDLE
LOCK BUTTON
■ If you are replacing the guard, loosen the clamp screw
Fig. 9
until the guard can be removed from the bearing cap.
■ Place the new guard on the shoulder of the bearing cap.
See Figure 9.
Note: If the new guard will not fit, loosen the clamp
screw until the guard slides over the bearing cap.
■ Rotate guard to the correct position as shown in figures 4,
5, and 6.
■ Tighten clamp screw securely.
Note: Be sure the tabs on the guard are seated in the
groove in the bearing cap.
■ Reassemble disc flange, grinding wheel, and clamp nut.
Refer to "INSTALLING THE GRINDING WHEEL" in-
structions on page 9.
■ Depress the spindle lock button and rotate the wheel
clockwise until the spindle locks in position.
■ Securely tighten the clamp nut with the wrench provided.
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MAINTENANCE
GENERAL
WARNING:
Always wear safety goggles or safety glasses with side
shieldsduringpowertooloperationorwhenblowingdust.
If operation is dusty, also wear a dust mask.
Avoidusingsolventswhencleaningplasticparts.Mostplastics
are susceptible to damage from various types of commercial
solvents and may be damaged by their use. Use clean cloths
to remove dirt, carbon dust, etc.
WARNING:
LUBRICATION
Do not at any time let brake fluids, gasoline, petroleum-
based products, penetrating oils, etc. come in contact
with plastic parts. They contain chemicals that can
damage, weaken, or destroy plastic.
All of the bearings in this tool are lubricated with a sufficient
amount of high grade lubricant for the life of the unit under
normaloperatingconditions. Therefore,nofurtherlubrication
is required.
WARNING:
The double insulated system is intended to protect the
user from shock resulting from a break in the tool's
internal wiring. Observe all normal safety precautions
related to avoiding electrical shock.
Page 13
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OPERATOR'S MANUAL
4 in. (100 mm) Angle Grinder
Model AG400 / Double Insulated
**Ampere rating
(on tool data plate) 0-2.0
EXTENSION CORD CAUTION
2.1-3.4 3.5-5.0 5.1-7.0 7.1-12.0 12.1-16.0
When using a power tool at a considerable distance from a power
source, be sure to use an extension cord that has the capacity to
handlethecurrentthetoolwilldraw. Anundersizedcordwillcause
a drop in line voltage, resulting in overheating and loss of power.
Use the chart to determine the minimum wire size required in an
extension cord. Only round jacketed cords should be used.
Cord Length
Wire Size (A.W.G.)
25'
50'
16
16
16
16
16
16
16
16
14
16
14
12
14
14
10
14
12
—
100'
When working with a tool outdoors, use an extension cord that is
designed for outside use. This is indicated by the letters "WA" on
the cord's jacket.
CAUTION: Keep the extension cord clear of the working
area. Position the cord so that it will not get caught on workpiece,
tools, or other obstructions while you are working with a power
tool.
Before using any extension cord, inspect it for loose or exposed
wires and cut or worn insulation.
**Used on 12 gauge - 20 amp circuit.
• SERVICE
Now that you have purchased your tool, should a need ever exist for repair parts or service,
simply contact your nearest Ryobi Authorized Service Center. Be sure to provide all
pertinent facts when you call or visit. Please call 1-800-525-2579 for your nearest Ryobi
complete list of Authorized Service Centers.
• MODEL NO.
The model number of your tool will be found on a plate attached to the motor housing.
Please record the model number and serial number in the space provided below.
•
•
MODEL NUMBER
SERIAL NUMBER
AG400
RYOBI TECHNOLOGIES, INC.
1428 Pearman Dairy Road Anderson SC 29625
Post Office Box 1207 Anderson SC 29622
Phone 1-800-525-2579
972000-911
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