OPERATOR`S MANUAL
OPERATOR’S MANUAL
4-1/2 in. ANGLE GRINDER
DOUBLE INSULATED
AG452
Your angle grinder has been engineered and manufactured to our high standard for dependability, ease of operation, and
operator safety. When properly cared for, it will give you years of rugged, trouble-free performance.
WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using
this product.
Thank you for your purchase.
SAVE THIS MANUAL FOR FUTURE REFERENCE
TABLE OF CONTENTS
 Introduction ..................................................................................................................................................................... 2
 Warranty .......................................................................................................................................................................... 2
� General Safety Rules .................................................................................................................................................... 3-4
� Specific Safety Rules....................................................................................................................................................... 4
� Symbols ........................................................................................................................................................................ 5-6
� Electrical .......................................................................................................................................................................... 7
� Features ........................................................................................................................................................................... 8
� Assembly ......................................................................................................................................................................... 9
� Operation .................................................................................................................................................................. 10-12
 Adjustments................................................................................................................................................................... 13
� Maintenance ............................................................................................................................................................. 14-15
� Parts Ordering / Service ................................................................................................................................... Back Page
INTRODUCTION
This tool has many features for making its use more pleasant and enjoyable. Safety, performance, and dependability have
been given top priority in the design of this product making it easy to maintain and operate.
WARRANTY
RYOBI® POWER TOOL - LIMITED TWO YEAR WARRANTY AND 30 DAY EXCHANGE POLICY
One World Technologies, Inc., warrants its RYOBI® power tools with the following conditions:
30-DAY EXCHANGE POLICY: During the first 30 days after date of purchase, you may either request service under this
warranty or you may exchange any RYOBI® power tool which does not work properly due to defective workmanship or
materials by returning the power tool to the dealer from which it was purchased. To receive a replacement power tool
or requested warranty service, you must present proof of purchase and return all original equipment packaged with the
original product. The replacement power tool will be covered by the limited warranty for the balance of the two year period
from the date of the original purchase.
WHAT THIS WARRANTY COVERS: This warranty covers all defects in workmanship or materials in your RYOBI® power
tool for a period of two years from the date of purchase. With the exception of batteries, power tool accessories are
warranted for ninety (90) days. Batteries are warranted for two years.
HOW TO GET SERVICE: Just return the power tool, properly packaged and postage prepaid, to an Authorized Service
Center. You can obtain the location of the Service Center nearest you by contacting a service representative at One
World Technologies, Inc., P.O. Box 1207, Anderson, SC 29622-1207, by calling 1-800-525-2579 or by logging on to
www.ryobitools.com. When you request warranty service, you must also present proof of purchase documentation, which
includes the date of purchase (for example, a bill of sale). We will repair any faulty workmanship, and either repair or replace
any defective part, at our option. We will do so without any charge to you. We will complete the work in a reasonable time,
but, in any case, within ninety (90) days or less.
WHAT’S NOT COVERED: This warranty applies only to the original purchaser at retail and may not be transferred. This
warranty only covers defects arising under normal usage and does not cover any malfunction, failure or defects resulting
from misuse, abuse, neglect, alteration, modification or repairs by other than Authorized Service Centers. One World
Technologies, Inc. makes no warranties, representations or promises as to the quality or performance of its power tools
other than those specifically stated in this warranty.
ADDITIONAL LIMITATIONS: Any implied warranties granted under state law, including warranties of merchantability or
fitness for a particular purpose, are limited to two years from the date of purchase. One World Technologies, Inc. is not
responsible for direct, indirect, or incidental damages, so the above limitations and exclusions may not apply to you. This
warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
2
GENERAL SAFETY RULES
 Keep your work area clean and well lit. Cluttered
benches and dark areas invite accidents.
 Do not operate power tools in explosive atmospheres,
such as in the presence of flammable liquids, gases,
or dust. Power tools create sparks which may ignite the
dust or fumes.
 Keep bystanders, children, and visitors away while
operating a power tool. Distractions can cause you to
lose control.
 Avoid accidental starting. Be sure switch is off
before plugging in. Carrying tools with your finger on
the switch or plugging in tools that have the switch on
invites accidents.
 Remove adjusting keys or wrenches before turning
the tool on. A wrench or a key that is left attached to a
rotating part of the tool may result in personal injury.
 Do not overreach. Keep proper footing and balance
at all times. Proper footing and balance enables better
control of the tool in unexpected situations.
 Use safety equipment. Always wear eye protection.
Dust mask, nonskid safety shoes, hard hat, or hearing
protection must be used for appropriate conditions.
 Do not wear loose clothing or jewelry. Contain long
hair. Loose clothes, jewelry, or long hair can be drawn
into air vents.
 Do not use on a ladder or unstable support. Stable
footing on a solid surface enables better control of the
tool in unexpected situations.
ELECTRICAL SAFETY
TOOL USE AND CARE
 Double insulated tools are equipped with a polarized
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 insulation
eliminates the need for the threewire grounded power cord and grounded power supply
system.
 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 conditions.
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 immediately. Damaged cords increase
the risk of electric shock.
 When operating a power tool outside, use an outdoor
extension cord marked “W-A” or “W”. These cords are rated for outdoor use and reduce the risk of electric shock.
 Use clamps or other practical way to secure and
support the workpiece to a stable platform. Holding
the work by hand or against your body is unstable and
may lead to loss of control.
 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 power source before making
any adjustments, changing accessories, or storing the
tool. Such preventive safety measures reduce the risk of
starting the tool accidentally.
 Store idle tools out of the 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.
 Check for misalignment or binding of moving parts,
breakage of parts, and any other condition that may
affect the tool’s operation. If damaged, have the tool
serviced before using. Many accidents are caused by
poorly maintained tools.
 Use only accessories that are recommended by the
manufacturer for your model. Accessories that may be
suitable for one tool, may become hazardous when used
on another tool.
 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.
Following this rule will reduce the risk of loss of control
and deterioration of the enclosure plastic.
WARNING:
Read and understand all instructions. Failure to follow
all instructions listed below, may result in electric shock,
fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
WORK AREA
PERSONAL SAFETY
 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 of inattention while operating
power tools may result in serious personal injury.
 Dress properly. Do not wear loose clothing or jewelry.
Contain long hair. Keep your hair, clothing, and gloves
away from moving parts. Loose clothes, jewelry, or long
hair can be caught in moving parts.
3
GENERAL SAFETY RULES
SERVICE
 When servicing a tool, use only identical replacement
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
shock or injury.
 Tool service must be performed only by qualified
repair personnel. Service or maintenance performed by
unqualified personnel may result in a risk of injury.
SPECIFIC SAFETY RULES
 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 shock, fire, or serious injury.
 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
performing an operation where the cutting tool may
contact hidden wiring or its own cord. Contact with a
“live” wire will make exposed metal parts of the cutting
tool “live” and shock the operator.
 Make sure your extension cord is in good condition. When using an extension cord, be sure to use
one heavy enough to carry the current your product
will draw. A wire gauge size (A.W.G.) of at least 14 is
recommended for an extension cord 50 feet or less
in length. A cord exceeding 100 feet is not recommended. If in doubt, use the next heavier gauge. The
smaller the gauge number, the heavier the cord. An
undersized cord will cause a drop in line voltage resulting
in loss of power and overheating.
 Use side handles supplied with the tool. Loss of control
can cause personal injury.
 Know your power tool. Read operator’s manual carefully. Learn its applications and limitations, as well
as the specific potential hazards related to this tool.
Following this rule will reduce the risk of electric shock,
fire, or serious injury.
 Always wear safety glasses. Everyday eyeglasses
have only impact-resistant lenses; they are NOT safety
glasses. Following this rule will reduce the risk of serious
personal injury.
 Inspect for and remove all nails from lumber before
using this tool. Following this rule will reduce the risk of
serious personal injury.
 Protect your lungs. Wear a face or dust mask if the
operation is dusty. Following this rule will reduce the risk
of serious personal injury.
 If the power supply cord is damaged, it must be replaced
only by the manufacturer or by an authorized service
center to avoid risk.
 Protect your hearing. Wear hearing protection during
extended periods of operation. Following this 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 instructions
also.
 Inspect tool cords periodically and, if damaged, have
repaired at your nearest Authorized Service Center.
Constantly stay aware of cord location. Following this
rule will reduce the risk of electric shock or fire.
4
SYMBOLS
Some of the following symbols may be used on this 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
Current
Hz
Hertz
Frequency (cycles per second)
W
Watt
Power
Minutes
Time
Alternating Current
Type of current
Direct Current
Type or a characteristic of current
No Load Speed
Rotational speed, at no load
Class II Construction
Double-insulated construction
Per Minute
Revolutions, strokes, surface speed, orbits etc., per minute
Wet Conditions Alert
Do not expose to rain or use in damp locations.
Read The Operator’s Manual
To reduce the risk of injury, user must read and understand
operator’s manual before using this product.
Eye Protection
Always wear safety goggles or safety glasses with side shields and,
as necessary, a full face shield when operating this product.
Safety Alert
Precautions that involve your safety.
No Hands Symbol
Failure to keep your hands away from the blade will result in serious
personal injury.
No Hands Symbol
Failure to keep your hands away from the blade will result in serious
personal injury.
No Hands Symbol
Failure to keep your hands away from the blade will result in serious
personal injury.
No Hands Symbol
Failure to keep your hands away from the blade will result in serious
personal injury.
Hot Surface
To reduce the risk of injury or damage, avoid contact with any hot
surface.
min
no
.../min
5
SYMBOLS
The following signal words and meanings are intended to explain the levels of risk associated with this product.
SYMBOL
SIGNAL
MEANING
DANGER:
Indicates an imminently hazardous situation, which, if not avoided, will result
in death or serious injury.
WARNING:
Indicates a potentially hazardous situation, which, if not avoided, could result
in death or serious injury.
CAUTION:
Indicates a potentially hazardous situation, which, if not avoided, may result in
minor or moderate injury.
CAUTION:
(Without Safety Alert Symbol) Indicates a situation that may result in property
damage.
SERVICE
WARNING:
Servicing requires extreme care and knowledge and should
be performed only by a qualified service technician. For
service we suggest you return the product to the nearest
AUTHORIZED SERVICE CENTER for repair. When servicing, use only identical replacement parts.
To avoid serious personal injury, do not attempt to use this
product until you read thoroughly and understand completely the operator’s manual. If you do not understand
the warnings and instructions in the operator’s manual,
do not use this product. Call Ryobi customer service for
assistance.
WARNING:
The operation of any power tool 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, when needed, a full face shield. We recommend Wide Vision
Safety Mask for use over eyeglasses or standard safety glasses with side shields. Always use eye
protection which is marked to comply with ANSI Z87.1.
SAVE THESE INSTRUCTIONS
6
ELECTRICAL
DOUBLE INSULATION
EXTENSION CORDS
Double insulation is a concept in safety in electric power
tools, which eliminates the need for the usual threewire grounded power cord. All exposed metal parts are
isolated from the internal metal motor components with
protecting insulation. Double insulated tools do not need
to be grounded.
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 handle the current the tool will draw. An
undersized cord will cause 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 listed by Underwriter’s Laboratories
(UL) should be used.
When working outdoors with a tool, use an extension cord
that is designed for outside use. This type of cord is designated with “WA” on the cord’s jacket.
Before using any extension cord, inspect it for loose or
exposed wires and cut or worn insulation.
WARNING:
The double insulated system is intended to protect
the user from shock resulting from a break in the tool’s
internal insulation. Observe all normal safety precautions
to avoid electrical shock.
NOTE: Servicing of a tool with double insulation requires
extreme care and knowledge of the system and should be
performed only by a qualified service technician. For service,
we suggest you return the tool to your nearest authorized
service center for repair. Always use original factory replacement parts when servicing.
**Ampere rating (on tool data plate)
0-2.0
2.1-3.4
Cord Length
ELECTRICAL CONNECTION
This tool has a precision-built electric motor. It should be
connected to a power supply that is 120 volts, 60 Hz, 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 the tool does
not operate when plugged into an outlet, double-check the
power supply.
3.5-5.0
5.1-7.0
7.1-12.0 12.1-16.0
Wire Size (A.W.G.)
25'
16
16
16
16
14
14
50'
16
16
16
14
14
12
100'
16
16
14
12
10
—
**Used on 12 gauge - 20 amp circuit.
NOTE: AWG = American Wire Gauge
WARNING:
Keep the extension cord clear of the working area.
Position the cord so that it will not get caught on lumber,
tools or other obstructions while you are working with a
power tool. Failure to do so can result in serious personal
injury.
WARNING:
Check extension cords before each use. If damaged
replace immediately. Never use tool with a damaged cord
since touching the damaged area could cause electrical
shock resulting in serious injury.
7
FEATURES
PRODUCT SPECIFICATIONS
Wheel Size ............................................................. 4 1/2 in.
No Load Speed .................................. 11,000 r/min. (RPM)
Cord Length ...............................................................10 ft.
Input ............................... 120 V, 60 Hz, AC only, 5.5 Amps
Arbor Size ................................................ 5/8 in. x 11 UNC
Net Weight ................................................................. 5 lbs.
90˚ ROTATING
HANDLE
SPINDLE
LOCK
LOCK-ON
BUTTON
SIDE HANDLE
WRENCH
STORAGE
WRENCH
GUARD
Fig. 1
KNOW YOUR ANGLE GRINDER
SIDE HANDLE
See Figure 1.
The safe use of this product requires an understanding of
the information on the tool and in this operator’s manual as
well as a knowledge of the project you are attempting. Before
use of this product, familiarize yourself with all operating
features and safety rules.
The side handle can be installed on the top, left, or right side
of the grinder, depending on operator preference, for stabilization and must be used during all operations. In addition
to maintaining safe control during use, the side handle also
provides convenient ease of operation for the operator.
LOCK-ON BUTTON
The spindle lock keeps the spindle from turning while installing and removing wheels and disks.
SPINDLE LOCK
The lock-on button is convenient for continuous grinding for
extended periods of time.
WRENCH STORAGE
The wrench can be easily stored in the side handle when
not in use.
90˚ ROTATING HANDLE
The handle rotates 90˚ to the left or right for ease of use.
8
ASSEMBLY
UNPACKING
WARNING:
This product requires assembly.
 Carefully remove the tool and any accessories from the
box. Make sure that all items listed in the packing list are
included.
 Inspect the tool carefully to make sure no breakage or
damage occurred during shipping.
 Do not discard the packing material until you have carefully inspected and satisfactorily operated the tool.
 If any parts are damaged or missing, please call
1-800-525-2579 for assistance.
If any parts are damaged or missing do not operate
this tool until the parts are replaced. Failure to heed this
warning could result in serious personal injury.
WARNING:
Do not attempt to modify this tool or create accessories not recommended for use with this tool. Any such
alteration or modification is misuse and could result in a
hazardous condition leading to possible serious personal
injury.
PACKING LIST
Angle Grinder
Wrench
Disc Flange
Flange Nut
Side Handle
Grinding Wheel
Wire Wheel
Abrasive Mop Disc
Case
Operator’s Manual
TO
LOOSEN
WARNING:
SIDE
HANDLE
TO
TIGHTEN
Thoroughly inspect a new grinding wheel before you
install it on the grinder.
Fig. 2
• Tap lightly around the wheel using a wooden hammer.
WARNING:
• Listen carefully to the resulting sounds. Places with fissures or cracks will result in a different sound.
Do not connect to power supply until assembly is
complete. Failure to comply could result in accidental
starting and possible serious personal injury.
Do not use a wheel containing fissures or cracks.
When you install a new grinding wheel, carry out a no
load revolution test of approximately one minute with
the grinding wheel facing a safe direction, i.e., away from
people or objects.
INSTALLING THE SIDE HANDLE
See Figure 2.
 Unplug the angle grinder.
 Insert the side handle into the desired operating
position.
WARNING:
 Securely tighten by turning the side handle clockwise.
NOTE: The handle can be installed on the top, left, or right
side of the grinder, depending on operator preference.
The side handle must always be used to help prevent
loss of control and possible serious injury.
9
OPERATION
WARNING:
Do not allow familiarity with tools to make you
careless. Remember that a careless fraction of a second
is sufficient to inflict serious injury.
LOCK-ON
BUTTON
WARNING:
Always wear safety goggles or safety glasses with side
shields when operating power tools. Failure to do so
could result in objects being thrown into your eyes
resulting in possible serious injury.
SWITCH
TRIGGER
Fig. 3
LOCK-ON BUTTON
See Figure 3.
The angle grinder is equipped with a lock-on feature, which
is convenient for continuous grinding/sanding for extended
periods of time.
To lock-on:
 Depress the switch trigger.
WARNING:
Do not use any attachments or accessories not
recommended by the manufacturer of this tool. The use
of attachments or accessories not recommended can
result in serious personal injury.
 Push in and hold the lock-on button, located on the side
of the handle.
DANGER:
 Release the switch trigger.
Never attach a wood cutting or carving blade of any type
to this angle grinder. It is only designed for grinding and
sanding. Use for any other purpose is not recommended
and creates a hazard, which will result in serious injury.
 Release the lock-on button and the angle grinder will
continue running.
 To release the lock, depress and release the switch
trigger.
If the lock-on feature is engaged during use and the angle
grinder becomes disconnected from the power supply,
disengage the lock-on feature immediately.
DANGER:
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.
CAUTION:
Never cover air vents. They must always be open for
proper motor cooling.
DANGER:
INSTALLING ACCESSORY WHEELS
Never attach a TYPE 1 straight or cut-off wheel to
this angle grinder. It is only designed for grinding and
sanding. Use for any other purpose is not recommended
and creates a hazard, which will result in serious injury.
See Figures 4 - 6.
 Unplug the angle grinder.
 Depress and hold spindle lock button and rotate flange
nut with provided wrench until spindle locks.
NOTE: To prevent damage to the spindle or spindle lock,
always allow motor to come to a complete stop before
engaging spindle lock.
 Loosen and remove flange nut from spindle. Do not
remove disc flange.
 Make sure flats on the bottom of disc flange are engaged
with flats on spindle.
 Place the accessory wheel over the spindle.
APPLICATIONS
You may use this tool for the purposes listed below:
 Grinding metals
 Sanding wood or metal surfaces
 Wire brushing rusted or painted surfaces
SWITCH TRIGGER
See Figure 3.
To turn the angle grinder ON, depress the switch trigger.
To turn it OFF, release the switch trigger.
10
OPERATION
 To install grinding wheel and wire wheel brush, thread the
nut on the spindle with the flat side of flange nut facing
up. Fit raised, small diameter portion of the nut into the
hole in the wheel and finger tighten. See figures 4 and 5.
 To install abrasive mop disc, thread the flange nut on
the spindle with the flat side of nut facing down. Finger
tighten. See figure 6.
 Depress and hold the spindle lock button and rotate the
wheel clockwise until the spindle locks in position.
 Securely tighten the flange nut with the wrench provided.
Do not overtighten.
WARNING:
Always install grinding wheel and abrasive mop disc
with the depressed center against the disc flange as
shown below. Failure to do so will cause the grinding
wheel to crack when tightening the nut. This could result
in serious personal injury because of loose particles
breaking off and being thrown from the angle grinder.
Do not overtighten.
TO
TIGHTEN
TO
LOOSEN
NUT TURNED
INCORRECTLY
WRENCH
FLANGE
NUT
GRINDING
WHEEL
FLANGE NUT
TURNED
CORRECTLY
TO
TIGHTEN
TO
LOOSEN
WIRE
WHEEL BRUSH
NUT TURNED
INCORRECTLY
TO
TIGHTEN
TO
LOOSEN
FLANGE NUT
TURNED
CORRECTLY
ABRASIVE
MOP DISC
DISC
FLANGE
SPINDLE
DISC
FLANGE
DISC
FLANGE
FLAT(S)
SPINDLE
LOCK
Fig. 5
Fig. 4
Fig. 6
GRINDING, SANDING, BRUSHING
See Figure 7.
 The key to efficient operation is controlling the pressure
and surface contact between the grinding wheel and
workpiece.
 Always carefully select and use grinding wheels that are
recommended for the material to be ground.
 Make sure the minimum operating speed of any accessory wheel selected is not less than 11,000 RPM.
 Flat surfaces are ground at an acute angle, normally
between 5° and 15°.
 The grinding wheel provided with the angle grinder is suitable for grinding welds, preparing surfaces to be welded,
grinding structural steel, and grinding stainless steel.
 For maximum control, hold the angle grinder in front and
away from you with both hands, keeping the grinding
wheel clear of the workpiece.
 The wire wheel brush is suitable for removing paint or
rust from metal surfaces.
 Start the angle grinder and let the motor and grinding
wheel build up to full speed.
 The abrasive mop disc is suitable for sanding flat metal
or wood surfaces.
 Gradually lower angle grinder until the grinding wheel
contacts the workpiece.
 Secure all work before beginning any operation.
 For best results keep the angle grinder tilted at an angle
from 5° to 15° and continuously moving at a steady,
consistent pace.
 Secure small workpieces in a vise or clamp to a workbench.
11
OPERATION
 Move the angle grinder back and forth or up and down
over the work area.
 Keep the angle grinder moving so that an excessive
amount of material is not removed from one area.
 If the angle grinder is held in one spot too long, it will
gouge and cut grooves in the workpiece.
 If the angle grinder is held at too sharp an angle, it will
also gouge the workpiece because of concentration of
pressure on a small area.
5° TO 15°
 Use just enough pressure to keep the angle grinder from
chattering or bouncing. Heavy pressure will decrease its
speed and put a strain on the motor.
Fig. 7
PUSH
HANDLE LOCK BUTTON
TO ROTATE HANDLE
 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 angle grinder to
snag on the metal edge.
 Lift the angle grinder away from the workpiece before
turning the angle grinder off.
WARNING:
Wire wheel brush bristles will bend during use and show
their direction of rotation. When reusing the wire wheel
brush, always mount it to rotate in the same direction
as in prior use. Failure to heed this warning can result in
bristle breaking and extreme vibration of the wire wheel
brush that could result in serious personal injury.
Fig. 8
90˚ ROTATING HANDLE
See Figure 8.
The handle on the angle grinder can rotate 90˚ to the left or
the right for ease of operation.
To adjust the 90˚ rotating handle:
 Press and hold handle lock button.
 Rotate the handle to the desired position and release the
handle lock button.
NOTE: Make sure the handle lock button on the 90˚ rotating
handle clicks and locks into place when changing handle
positions.
12
ADJUSTMENTS
A
WARNING:
CORRECT
LOCATION OF GUARD IS
BETWEEN POINTS
A AND B
Before performing any adjustment, make sure the tool
is unplugged from the power supply and the switch is in
the OFF ( O ) position. Failure to heed this warning could
result in serious personal injury.
GUARD ADJUSTMENT
See Figure 9 - 11.
Never use the angle grinder without the guard in place and
properly adjusted.
 Unplug the angle grinder.
Fig. 9
 Using the wrench provided, loosen and remove nut,
accessory wheel, and disc flange from spindle if necessary.
B
 Unlock the guard clamp lever.
 Rotate the guard to its correct position as shown in figures
9 and 10.
 Lock the guard clamp lever.
 Retighten clamp screw securely if needed.
WARNING:
Never place the guard so that it is on front of the angle
grinder as shown in figure 11. This could result in serious
injury because 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 9 and 10.
Fig. 10
INCORRECT
LOCATION OF GUARD
DANGER:
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.
Fig. 11
13
MAINTENANCE
BRUSH
CAP
WARNING:
When servicing, use only identical replacement parts.
Use of any other parts may create a hazard or cause
product damage.
BRUSH
ASSEMBLY
WARNING:
Always wear safety goggles or safety glasses with side
shields during power tool operation or when blowing
dust. If operation is dusty, also wear a dust mask.
GENERAL MAINTENANCE
Avoid using solvents when cleaning plastic parts. Most
plastics are susceptible to damage from various types of
commercial solvents and may be damaged by their use. Use
clean cloths to remove dirt, dust, oil, grease, etc.
BRUSH
ASSEMBLY
WARNING:
BRUSH
CAP
Do not at any time let brake fluids, gasoline, petroleumbased products, penetrating oils, etc., come in contact
with plastic parts. Chemicals can damage, weaken or
destroy plastic which may result in serious personal
injury.
Fig. 12
BRUSH ASSEMBLIES
See Figure 12.
The angle grinder has externally accessible brush assemblies
that should periodically be checked for wear.
To replace brushes:
 Unplug the angle grinder.
Electric tools used on fiberglass material, wallboard, spackling
compounds, or plaster are subject to accelerated wear and
possible premature failure because the fiberglass chips and
grindings are highly abrasive to bearings, brushes, commutators, etc. Consequently, we do not recommend using this
tool for extended work on these types of materials. However,
if you do work with any of these materials, it is extremely
important to clean the tool using compressed air.
 Remove brush cap with a screwdriver. Brush assembly
is spring loaded and will pop out when you remove
brush cap.
 Remove brush assembly (brush and spring).
 Check for wear. If worn, always replace in pairs. Do not
replace one side without replacing the other.
 Reassemble using new brush assemblies. Make sure
curvature of brush matches curvature of motor and that
brush moves freely in brush tube.
 Make sure brush cap is oriented correctly (straight) and
replace.
 Tighten brush cap securely. Do not overtighten.
LUBRICATION
All of the bearings in this tool are lubricated with a sufficient
amount of high grade lubricant for the life of the unit under
normal operating conditions. Therefore, no further lubrication
is required.
WARNING:
To prevent accidental starting that could cause possible
serious personal injury, turn off the tool, and unplug the
angle grinder before performing any maintenance or
adjustment.
14
MAINTENANCE
GUARD REPLACEMENT
TO
TIGHTEN
See Figure 13.
After extended use, the guard may become worn and need
adjustment or replacing. Or, if you drop the angle grinder and
damage the guard, it may be necessary to replace it.
TO
LOOSEN
To replace the guard:
 Unplug the angle grinder.
WRENCH
FLANGE
NUT
GRINDING
WHEEL
 Depress spindle lock button and rotate nut with provided
wrench until spindle locks.
 Using the wrench provided, loosen and remove nut,
grinding or accessory wheel, and disc flange from spindle
if necessary.
NOTE: To prevent damage to the spindle or spindle lock,
always allow motor to come to a complete stop before
engaging spindle lock.
 Unlock the guard clamp lever.
 Remove the guard.
 Place the new guard on the shoulder of the bearing cap,
aligning the arrow with the slot on the bottom of the angle
grinder.
NOTE: If the new guard will not fit, loosen the clamp
screw until it will slide over the bearing cap. Be sure the
tabs on the guard are seated in the groove in the bearing
cap.
 Rotate guard to the correct position as shown in figures
9 and 10.
 Lock the guard clamp lever.
 Tighten clamp screw securely if needed.
DISC
FLANGE
GUARD
GUARD
CLAMP
LEVER
ARROW
CLAMP
SCREW
SPINDLE
BEARING CAP
SPINDLE
LOCK BUTTON
15
Fig. 13
OPERATOR’S MANUAL
4-1/2 in. ANGLE GRINDER
DOUBLE INSULATED
AG452
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:
• lead from lead-based paints,
• crystalline silica from bricks and cement and other masonry products, and
• arsenic and chromium from chemically-treated lumber.
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.
• SERVICE
Now that you have purchased your tool, should a need ever exist for repair parts or service,
simply contact your nearest Authorized Service Center. Be sure to provide all pertinent
facts when you call or visit. Please call 1-800-525-2579 for your nearest Authorized
Service Center. You can also check our web site at www.ryobitools.com for a complete
list of Authorized Service Centers.
• MODEL NO. AND SERIAL NO.
The model number of this 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.
tttt
• HOW TO ORDER REPAIR PARTS
When ordering repair parts, always give the following information:
•
MODEL NUMBER
•
SERIAL NUMBER
AG452
Ryobi® is a registered trademark of Ryobi Limited used under license.
ONE WORLD TECHNOLOGIES, INC.
1428 Pearman Dairy Road, Anderson, SC 29625
Phone 1-800-525-2579
www.ryobitools.com
983000-998
06-07-07 (REV:02)
16
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