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OPERATOR’S MANUAL
ANGLE GRINDER
4-1/2 in., 18 V
P420
BATTERIES AND CHARGERS
SOLD SEPARATELY
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
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TABLE OF CONTENTS
Introduction ..................................................................................................................................................................... 2
� Warranty .......................................................................................................................................................................... 2
General Safety Rules .................................................................................................................................................... 3-4
� Specific Safety Rules ....................................................................................................................................................... 4
Safety Rules for Charger ................................................................................................................................................. 5
� Symbols ........................................................................................................................................................................6-7
�� Features ........................................................................................................................................................................8-9
�� Assembly ....................................................................................................................................................................9-10
� Operation .................................................................................................................................................................. 10-15
� Maintenance ............................................................................................................................................................. 16-17
� Parts Ordering / Service ...................................................................................................................................Back Page
INTRODUCTION
This product 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
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.
® power tool which does not work properly due to defective workmanship or
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GENERAL SAFETY RULES
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
Keep your work area clean and well lit. Cluttered
benches and dark areas invite accidents.
Do n o t o pe r at e p o we r t oo ls i n e xpl o si v e
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.
ELECTRICAL SAFETY
A battery operated tool with integral batteries or a
separate battery pack must be recharged only with
the specified charger for the battery. A charger that
may be suitable for one type of battery may create a risk
of fire when used with another battery.
Use battery operated tool only with specifically
designated battery pack. Use of any other batteries may
create a risk of fire.
Use battery only with charger listed.
MODEL BATTERY PACK (P100) CHARGER (P110)
P420 130255004 1423701, 140237023
or 130224028 or 140237021
PERSONAL SAFETY
Stay alert, watc h 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.
Avoid accidental starting. Be sure switch is in the locked
or off position before inserting battery pack. Carrying
tools with your finger on the switch or inserting the battery
pack into a tool with 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 enable better
control of the tool in unexpected situations.
Use safety equipment. Always wear eye protection.
Dust mask, non-skid 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.
TOOL USE AND CARE
Use clamps or other practical way to secure and
support the workpiece to a stable platform.
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.
A tool that cannot be controlled with the switch is
dangerous and must be repaired.
Disconnect battery pack from tool or place the
switch in the locked or off position 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 reach of children and other
untrained persons. Tools are dangerous in the hands
of untrained users.
When battery pack is not in use, keep it away from
other metal objects like: paper clips, coins, keys, nails,
screws, or other small metal objects that can make
a connection from one terminal to another. Shorting
the battery terminals together may cause sparks, burns,
or a fire.
Maintain tools with care. Keep cutting tools sharp
and clean. Properly maintained too ls 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 create a risk of injury when used
on another tool.
Keep the tool and its handle dry, clean and free from
oil and grease.
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.
Always use a clean cloth when cleaning.
Holding
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GENERAL SAFETY RULES
SERVICE
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
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. Contact with a “live” wire will also
make exposed metal parts of the tool “live” and shock
the operator.
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 wea r safety glasses with side shields.
Everyday glasses have only impact resistant lenses. They
are NOT safety glasses. Following this rule will reduce
the risk of eye 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.
Protect your hearing. Wear hearing protection during
extended periods of operation. Following this rule will
reduce the risk of serious personal injury.
Battery tools do not have to be plugged into an
electric al outl et; therefore, they are always in
operating condition. Be aware of possible hazards
when not using your battery tool or when changing
accessories. Following this rule will reduce the risk of
electric shock, fire, or serious personal injury.
Do not place battery tools or their batteries near fire
or heat. This will reduce the risk of explosion and possibly
injury.
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.
Do not crush, drop or damage battery pack. Do not
use a battery pack or charger that has been dropped
or received a sharp blow. A damaged battery is subject
to explosion. Properly dispose of a dropped or damaged
battery immediately.
Batteries vent hydrogen gas and can explode in the
presence of a source of ignition, such as a pilot light.
To reduce the risk of serious personal injury, never use
any cordless product in the presence of open flame. An
exploded battery can propel debris and chemicals. If
exposed, flush with water immediately.
Do no t charg e batte ry tool in a damp or wet
location. Following this rule will reduce the risk of electric
shock.
For best results, your battery tool should be charged
in a location where the temperature is more than
50°F but less than 100°F. Do not store outside or in
vehicles.
Under extreme usage or temperature conditions,
battery leakage may occur. If liquid comes in contact
with your skin, wash immediately with soap and water,
then neutralize with lemon juice or vinegar. If liquid
gets into your eyes, flush them with clean water for
at least 10 minutes, then seek immediate medical
attention. 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.
If the power supply cord is damaged, it must be replaced
only by the manufacturer or by an authorized service
center to avoid risk.
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SAFETY RULES FOR CHARGER
WARNING!
READ AND UNDERSTAND ALL INSTRUCTIONS.
Failure to follow all instructions listed below, may result in
electric shock, fire and/or serious personal injury.
Before using battery charger, read all instructions and
cautionary markings in this manual, on battery charger,
battery, and product using battery to prevent misuse of
the products and possible injury or damage.
An extensi on cord shou ld not be used unl ess
absolutely necessary. Use of improper extension cord
could result in a risk of fire and electric shock. If extension
cord must be used, make sure:
a. That pins on plug of extension cord are the same
number, size and shape as those of plug on charger.
b. That extension cord is properly wired and in good
electrical condition; and
c. That wire size is large enough for AC ampere rating of
charger as specified below:
CAUTION:
To reduce the risk of electric shock or damage to the
charger and battery, charge only nickel-cadmium
rechargeable batteries as specifically designated on your
charger. Other types of batteries may burst, causing
personal injury or damage.
Do not use charger outdoors or expose to wet or damp
conditions. Water entering charger will increase the risk
of electric shock.
Use of an attachment not recommended or sold by the
battery charger manufacturer may result in a risk of
fire, electric shock, or injury to persons. Following this
rule will reduce the risk of electric shock, fire, or serious
personal injury.
Do not abuse cord or charger. Never use the cord to
carry the charger. Do not pull the charger cord rather than
the plug when disconnecting from receptacle. Damage
to the cord or charger could occur and create an electric
shock hazard. Replace damaged cords immediately.
Make sure cord is located so that it will not be stepped
on, tripped over, come in contact with sharp edges
or moving parts or otherwise subjected to damage or
stress. This will reduce the risk of accidental falls, which
could cause injury, and damage to the cord, which could
result in electric shock.
Keep cord and charger from heat to prevent damage
to housing or internal parts.
Do not let gasoline, oils, petroleum-based products,
etc. come in contact with plastic parts. They contain
chemicals that can damage, weaken, or destroy plastic.
Cord Length (Feet) 25
Cord Size (AWG) 16 16 16
NOTE: AWG = American Wire Gauge
Do not operate charger with a damaged cord or
plug, which could cause shorting and electric shock. If
damaged, have the charger replaced by an authorized
serviceman.
Do not operate charger if it has received a sharp blow,
been dropped, or otherwise damaged in any way.
Take it to an authorized serviceman for electrical check
to determine if the charger is in good working order.
Do not disassemble charger. Take it to an authorized
serviceman when service or repair is required. Incorrect
reassembly may result in a risk of electric shock or fire.
Unplug charger from outlet before attempting any
maintenance or cleaning to reduce the risk of electric
shock.
Disconnect charger from the power supply when
not in use. This will reduce the risk of electric shock or
damage to the charger if metal items should fall into the
opening. It also will help prevent damage to the charger
during a power surge.
Risk of electric shock. Do not touch uninsulated portion
of output connector or uninsulated battery terminal.
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
to prevent misuse of the product and possible injury.
' 50' 100'
IMPORTANT SAFETY INSTRUCTIONS
1. SAVE THESE INSTRUCTIONS
This manual contains important safety and operating instructions for battery chargers 1423701, 140237023, and
140237021.
2. Before using battery charger, read all instructions and cautionary markings on battery charger, battery, and product
using battery.
3. CAUTION: To reduce the risk of injury, charge only nickel-cadmium rechargeable batteries. Other types of batteries
may burst, causing personal injury or damage.
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SYMBOLS
Some of the following symbols may be used on this product. Please study them and learn their meaning. Proper
interpretation of these symbols will allow you to operate the product better and safer.
SYMBOL NAME
V Volts Voltage
A Amperes Current
Hz Hertz Frequency (cycles per second)
W Watt Power
min Minutes Time
Alternating Current Type of current
Direct Current Type or a characteristic of current
n
o
.../min Per Minute Revolutions, strokes, surface speed, orbits etc., per minute
No Load Speed Rotational speed, at no load
Class II Construction Double-insulated construction
DESIGNATION/EXPLANATION
Wet Conditions Alert Do not expose to rain or use in damp locations.
Read The Operator’s Manual
Eye Protection
Safety Alert Precautions that involve your safety.
No Hands Symbol
No Hands Symbol
No Hands Symbol
No Hands Symbol
To reduce the risk of injury, user must read and understand
operator’s manual before using this product.
Always wear safety goggles or safety glasses with side shields and,
as necessary, a full face shield when operating this product.
Failure to keep your hands away from the blade will result in serious
personal injury.
Failure to keep your hands away from the blade will result in serious
personal injury.
Failure to keep your hands away from the blade will result in serious
personal injury.
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.
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SYMBOLS
The following signal words and meanings are intended to explain the levels of risk associated with this product.
SYMBOL SIGNAL MEANING
DANGER:
WARNING:
CAUTION:
CAUTION:
Indicates an imminently hazardous situation, which, if not avoided, will result
in death or serious injury.
Indicates a potentially hazardous situation, which, if not avoided, could result
in death or serious injury.
Indicates a potentially hazardous situation, which, if not avoided, may result in
minor or moderate injury.
(Without Safety Alert Symbol) Indicates a situation that may result in property
damage.
SERVICE
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
AU THOR IZED SERVICE CENTE R for rep air. When
servicing, use only identical replacement parts.
WARNING:
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
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FEATURES
PRODUCT SPECIFICATIONS
Grinding Wheel Capacity .......................................4-1/2 in.
Motor ................................................................. 18 Volt DC
No Load Speed ..................................... 6,500 r/min. (RPM)
SWITCH TRIGGER
SPINDLE LOCK
Spindle Thread .............................................
Charger Input .................................. 120 V, 60 Hz, AC only
Charge Rate ..............................................................
LOCK-OFF BUTTON
5/8 x 11 UNC
1 hour
DISC FLANGE
ROTATING FOOT
TOOLLESS GUARD
SIDE HANDLE
WRENCH
STORAGE SLOT
WRENCH
GRINDING WHEEL
CLAMP NUT
Fig. 1
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FEATURES
KNOW YOUR ANGLE GRINDER
See Figure 1.
The safe use of this product requires an understanding of the
information on the product 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.
WRENCH STORAGE SLOT
The wrench can be conveniently stored in the side handle
storage slot when not in use.
LOCK-OFF BUTTON
Your grinder is equipped with a lock-off button which reduces
the possibility of accidental starting.
ROTATING FOOT
The foot of the grinder can be rotated up to 270° to the left
for easier access to hard to reach areas. Stops are located
at 90°, 180°, and 270°.
ASSEMBLY
SIDE HANDLE
The side handle can be installed on the top, left, or right side
of the grinder for stabilization and must be used during all
operations. The side handle provides convenient ease of
operation for the operator.
SPINDLE LOCK
The spindle lock secures the spindle so that only one wrench
is needed to change the grinding wheel.
TOOLLESS GUARD
A toolless guard deflects sparks and metal chips during
use.
UNPACKING
This product requires assembly.
Carefully remove the product and any accessories from
the box. Make sure that all items listed in the packing list
are included.
Inspect the product 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 product.
If any parts are damaged or missing, please call
1-800-525-2579 for assistance.
PACKING LIST
Angle Grinder with Guard
Clamp Nut
Disc Flange
Grinding Wheel
Side Handle
Wrench
Operator’s Manual
WARNING:
If any parts are damaged or missing do not operate
this product until the parts are replaced. Failure to heed
this warning could result in serious personal injury.
WARNING:
Do not attempt to modify this product or create
accessories not recommended for use with this product.
Any such alteration or modification is misuse and could
result in a hazardous condition leading to possible serious
personal injury.
WARNING:
To prevent accidental starting that could cause serious
personal injury, always remove the battery pack from the
product when assembling parts.
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ASSEMBLY
ATTACHING THE SIDE HANDLE
See Figure 2.
� Remove the battery pack from the grinder.
Insert the side handle into the desired operating
position.
NOTE: The handle can be installed on the top, left, or right
side of the grinder, depending on operator preference. The
handle must always be used to prevent loss of control
and possible serious injury.
Securely tighten by turning the side handle clockwise.
OPERATION
SIDE HANDLE
Fig. 2
WARNING:
Do not allow familiarity with products to make you
careless. Remember that a careless fraction of a second is
sufficient to inflict serious injury.
WARNING:
Always wear safety goggles or safety glasses with side
shields when operating products. Failure to do so could
result in objects being thrown into your eyes, resulting in
possible serious injury.
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.
APPLICATIONS
You may use this product for the purposes listed below:
Grinding metals
Sanding wood or metal surfaces
LED FUNCTIONS OF CHARGER
LED WILL BE ON TO INDICATE STATUS OF
CHARGER AND BATTERY PACK:
Red LED on = Fast charging mode.
Green LED on = Fully charged and in maintenance charge
mode.
Green LED on = When battery pack is inserted into
charger, indicates hot battery pack or that battery pack
is out of normal temperature range.
Yellow and Green LEDs on = Deeply discharged or
defective battery pack.
No LED on = Defective charger or battery pack.
CHARGING THE BATTERY PACK
The battery pack for this product has been shipped in a low
charge condition to prevent possible problems. Therefore,
you should charge it until the green LED on the front of the
charger comes on.
NOTE: Batteries will not reach full charge the first time they
are charged. Allow several cycles (operation followed by
recharging) for them to become fully charged.
CAUTION:
If at any point during the charging process none of the
LEDs are lit, remove the battery pack from the charger
to avoid damaging the product. DO NOT insert another
battery. Return the charger and battery to your nearest
service center for service or replacement.
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OPERATION
CHARGING A COOL BATTERY PACK
If battery pack is within normal temperature range, the red
LED on charger will come on.
NOTE: If the charger does not charge the battery pack
under normal circumstances, return both the battery pack
and charger to your nearest Authorized Service Center for
electrical check.
Charge the battery pack only with the charger provided.
Make sure the power supply is normal household
voltage, 120 volts, 60 Hz, AC only.
Connect the charger to the power supply.
Place the battery pack in the charger aligning raised rib
on the battery pack with the groove in the charger.
Figure 3.
Press down on the battery pack to be sure contacts on
the battery pack engage properly with contacts in the
charger.
Normally the red LED on charger will come on. This
indicates the charger is in fast charging mode.
Red LED should remain on for approximately 1 hour
then the green LED will come on. Green LED on
indicates battery pack is fully charged and charger is
in maintenance charge mode.
NOTE: The green LED wi l l re m a i n on until the
battery pack is removed from the charger or charger is
disconnected from the power supply.
If both yellow and green LEDs come on, this indicates
a deep l y discharged or defectiv e ba ttery pack.
Allow the battery pack to remain in the charger for 15
to 30 minutes. When the battery pack reaches normal
voltage range, the red LED should come on. If the
red LED does not come on after 30 minutes, this may
indicate a defective battery pack that should be
replaced.
After normal usage, a minimum of 1 hour of charging time
is required to fully recharge battery pack.
The battery pack will become slightly warm to the
touch while charging. This is normal and does not
indicate a problem.
Do not place the charger and battery pack in an area of
extreme heat or cold. They will work best at normal room
temperature.
NOTE: The charger and battery pack should be placed in
a location where the temperature is more than 50°F but
less than 100°F.
When batteries become fully charged, unplug the
charger from power supply and remove the battery
pack.
See
CHARGING A HOT BATTERY PACK
When using the product continuously, the batteries in the
battery pack will become hot. You should let a hot battery pack
cool down for approximately 30 minutes before attempting to
recharge. When the battery pack becomes discharged and
is hot, this will cause the green LED to come on instead of
the red LED. After 30 minutes, reinsert the battery pack in
the charger. If the green LED continues to remain on, return
battery pack to your nearest Authorized Service Center for
checking or replacing.
NOTE: This situation only occurs when continuous use of
the product causes the batteries to become hot. It does not
occur under normal circumstances. Refer to CHARGING A
COOL BATTERY PACK for normal recharging of batteries. If
the charger does not charge your battery pack under normal
circumstances, return both the battery pack and charger
to your nearest Authorized Service Center for elect
check.
P100 BATTERY
PACK
YELLOW LED
GREEN LED
CHARGER
RED LED
rical
P110
Fig. 3
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OPERATION
TO INSTALL BATTERY PACK
See Figure 4.
Place the battery pack on the tool.
Make sure the latches on each side of the battery pack
snap into place and the battery pack is se cured on the
tool before beginning operation.
TO REMOVE BATTERY PACK
See Figure 4.
Depress the latches on the side of battery pack.
Remove the battery pack from the tool.
WARNING:
Battery products are always in operating condition.
Therefore, the switch should always be locked when not
in use or carrying at your side.
LOCK-OFF BUTTON
See Figure 5.
The lock-off button is located on the handle above the switch
trigger. You must depress the lock-off button in order to pull
the switch trigger. The lock resets each time the trigger is
released.
BATTERY PACK
Fig. 4
LOCK-OFF
BUTTON
SWITCH TRIGGER
See Figure 5.
To turn the grinder ON, depress and hold lock-off button,
then depress the switch trigger. To turn it OFF, release the
switch trigger.
SWITCH
TRIGGER
Fig. 5
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OPERATION
DANGER:
Never attach a wood cutting or carving blade of any
type to this 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.
DANGER:
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.
INSTALLING GRINDING WHEEL
See Figure 6.
WARNING:
Thoroughly inspect a new grinding wheel before you
install it on the grinder. Tap lightly around the wheel
using a wooden hammer. Listen carefully to the resulting
sounds. Places with fissures or cracks will result in a
different sound. 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.
Remove the battery pack from the grinder.
NOTE: The grinder is shipped with the disc flange and
clamp nut attached to the spindle.
Depress and hold the spindle lock and rotate the clamp
nut until the 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 the clamp nut from the spindle. Do
not remove the disc flange.
Make sure the flats on the bottom of the disc flange are
engaged with the flats on the spindle.
Place the grinding wheel over the spindle.
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 wheel and finger tighten.
WRENCH
TO LOOSEN
CLAMP NUT
GRINDING WHEEL
DISC FLANGE
TOOLLESS
GUARD
SPINDLE
TO TIGHTEN
SPINDLE
LOCK
Fig. 6
WARNING:
Always install a grinding wheel with the depressed center
against the disc flange. 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.
Do not overtighten.
Depress and hold the spindle lock button and rotate the
wheel clockwise until the spindle locks in position.
Tighten the clamp nut securely with the wrench provided.
Do not overtighten.
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Page 14
OPERATION
POSITIONING THE GUARD
See Figures 7 - 10.
The guard on the grinder should be correctly installed
depending on which side the handle is mounted. Never
use the grinder without the guard correctly in place.
WARNING:
Never place the guard so that it is in front of the grinder
as shown in figure 7. 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.
To adjust the guard:
� Remove battery from the grinder.
� Unlock the guard clasp by pulling the clasp out, away
from the grinder.
� Rotate the guard to its correct position as shown.
NOTE: Be sure the raised ridge on the guard is seated
in the groove on the bearing cap. Never use the grinder
without the guard in place and properly adjusted.
Fig. 7
TOOLLESS
GUARD
ROTATING FOOT
See Figure 11.
The foot of the grinder can be rotated up to 270° to the left
for easier access to hard to reach areas. Stops are located
at 90°, 180°, and 270°.
CLASP
Fig. 8
SIDE HANDLE ON LEFT SIDE OF GRINDER
TOOLLESS
GUARD
14
Fig. 9
Page 15
OPERATION
OPERATING THE GRINDER
See Figure 12.
Always carefully select and use grinding wheels that are
recommended for the material to be ground. Make sure
that the minimum operating speed of any accessory
wheel selected is 6,500 r/min. or more. The grinding wheel
provided with the grinder is suitable for grinding welds,
preparing surfaces to be welded, grinding structural steel,
and grinding stainless steel.
To operate the grinder:
Secure all work in a vise or clamp to a workbench.
DANGER:
Never use the 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.
Hold the grinder in front and away from you with
both hands, keeping the grinding wheel clear of the
workpiece.
Turn on the grinder and let the motor and grinding wheel
build up to full speed.
Lower the grinder gradually until the grinding wheel
contacts the workpiece.
Keep the grinder tilted at an angle between 5° and 15°.
SIDE HANDLE ON RIGHT SIDE OF GRINDER
TOOLLESS
GUARD
180°
270°
Fig. 10
90°
WARNING:
To prevent loss of control and possible serious personal
injury, always operate the grinder with both hands,
keeping one hand on the side handle.
Move the grinder continuously at a steady, consistent
pace.
CAUTION:
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.
Use just enough pressure to keep the grinder from
chattering or bouncing.
NOTE: Heavy pressure will decrease the grinder’s 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.
Lift the grinder away from the workpiece before turning
off the grinder.
Fig. 11
Fig. 12
15
Page 16
MAINTENANCE
WARNING:
When servicing, use only identical replacement parts.
Use of any other parts may create a hazard or cause
product damage.
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.
WARNING:
Always wear safety goggles or safety glasses with side
shields during power product operation or when blowing
dust. If operation is dusty, also wear a dust mask.
WARNING:
To avoid serious personal injury, always remove the
battery pack from the product when cleaning or
performing any maintenance.
BATTERIES
The battery pack for this product is equipped with nickelcadmium rechargeable batteries. Length of service from each
charging will depend on the type of work you are doing.
The batteries in this product have been designed to provide
maximum trouble-free life. However, like all batteries, they
will eventually wear out. Do not disassemble battery pack
and attempt to replace the batteries. Handling of these
batteries, especially when wearing rings and jewelry, could
result in a serious burn.
To obtain the longest possible battery life, we suggest the
following:
Remove the battery pack from the charger once it is fully
charged and ready for use.
For battery storage longer than 30 days:
Store the battery pack where the temperature is below
80°F.
Store battery packs in a “discharged” condition.
WARNING:
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.
Only the parts shown on the parts list are intended to be
repaired or replaced by the customer. All other parts should
be replaced at an Authorized Service Center.
BATTERY PACK REMOVAL AND PREPARATION
FOR RECYCLING
To preserve natural resources, please
rec y c le or d is p os e of b at te ri e s
properly.
This product contains nickel-cadmium
batteries. Local, state or federal laws
may prohibit disposal of nickel-cadmium
batteries in ordinary trash.
Consult your local waste authority for information regarding
available recycling and/or disposal options.
WARNING:
Upon removal, cover the battery pack’s terminals
with heavy-duty adhesive tape. Do not attempt
to dest r o y o r disa s se m bl e b at t er y pac k or
remove any of its components. Nickel-cadmium
batteries must be recycled or disposed of properly. Also,
never touch both terminals with metal objects and/or
body parts as short circuit may result. Keep away from
children. Failure to comply with these warnings could
result in fire and/or serious injury.
16
Page 17
REPLACING THE GUARD
See Figure 13.
MAINTENANCE
WRENCH
WARNING:
Do not change or loosen guard screw. Failure to heed this
warning may cause the guard to become loose during
operation resulting in serious personal injury.
After extended use, the guard may wear and need replacing.
If you drop the grinder and damage the guard it may also be
necessary for you to replace it.
To replace the guard:
Remove the battery pack from the grinder.
� Depress spindle lock and rotate clamp nut until spindle
locks.
Loosen and remove clamp nut from spindle using the
wrench provided.
Remove grinding wheel and disc flange.
� Unlock the guard clasp by pulling the clasp out, away
from the grinder.
� Open clasp fully and twist guard to release it from the
locking groove in the tool housing.
� Remove guard.
Place the new guard on the shoulder of the bearing
cap.
Rotate guard to the correct position. Refer to Positioning
the Guard earlier in this manual.
NOTE: Be sure the raised ridge on the guard is seated in
the groove on the bearing cap.
Reassemble disc flange, grinding wheel, and clamp nut.
Refer to Installing Grinding Wheel earlier in this manual.
Tighten the clamp nut securely with the wrench provided.
TO LOOSEN
CLAMP NUT
TO TIGHTEN
GRINDING WHEEL
DISC FLANGE
TOOLLESS
GUARD
SPINDLE
BEARING CAP
SPINDLE LOCK
CLASP
Fig. 13
17
Page 18
OPERATOR’S MANUAL
4-1/2 in., 18 VOLT ANGLE GRINDER
P420
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 product, 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 product will be found on a plate attached to the motor housing.
Please record the model number and serial number in the space provided below.
• HOW TO ORDER REPAIR PARTS
When ordering repair parts, always give the following information:
• MODEL NUMBER
• SERIAL NUMBER
Ryobi® is a registered trademark of Ryobi Limited used under license.
P420
983000-984
8-07-07 (REV:04)
ONE WORLD TECHNOLOGIES, INC.
1428 Pearman Dairy Road, Anderson, SC 29625
Phone 1-800-525-2579
www.ryobitools.com
18
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