Ryobi G-915 Operation manual

G-915

1
1 2
3 4
Cut off
wheel guard
wheel guard
Back flange
Back flange
Dry diamond wheel
Spindle
Spindle
Backing pad
Lock nut
Wire brush
Sanding disc
Spindle
Grinding wheel
Lock nut Lock nut
Collar screw
14
5
2
3
6

THANK YOU FOR BUYING A RYOBI PRODUCT.
To ensure your safety and satisfaction, carefully read
through this OWNER’S MANUAL before using the
product.
2
General Safety Rules
SAVE THESE INSTRUCTIONS
WARNING! Read all instructions Failure to follow all
instructions listed below may result in electric shock, fire
and/or serious injury. The term “power tool” in all of the
warnings listed below refers to your mains-operated
(corded) power tool or battery-operated (cordless) power
tool.
1) Work area
a) Keep work area clean and well lit. Cluttered and
dark areas invite accidents.
b) 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.
c) Keep children and bystanders away while
operating a power tool. Distractions can cause you
to lose control.
2) Electrical safety
a) Power tool plugs must match the outlet. Never
modify the plug in any way. Do not use any adapter
plugs with earthed (grounded) power tools.
Unmodified plugs and matching outlets will reduce
risk of electric shock
b) Avoid body contact with earthed or grounded
surfaces such as pipes, radiators, ranges and
refrigerators. There is an increased risk of electric
shock if your body is earthed or grounded.
c) Do not expose power tools to rain or wet
conditions. Water entering a power tool will increase
the risk of electric shock.
d) Do not abuse the cord. Never use the cord for
carrying, pulling or unplugging the power tool.
Keep cord away from heat, oil, sharp edges or
moving parts. Damaged or entangled cords
increase the risk of electric shock.
e) When operating a power tool outdoors, use an
extension cord suitable for outdoor use. Use of a
cord suitable for outdoor use reduces the risk of
electric shock.
3) Personal safety
a) Stay alert, watch what you are doing and use
common sense when operating a power tool. Do
not use a power tool while you are tired or under
the influence of drugs, alcohol or medication. A
moment of inattention while operating power tools
may result in serious personal injury.
b) Use safety equipment. Always wear eye
protection.Safety equipment such as dust mask,
non-skid safety shoes, hard hat, or hearing
protection used for appropriate conditions will reduce
personal injuries.
c) Avoid accidental starting. Ensure the switch is in
the off-position before plugging in.Carrying
power tools with your finger on the switch or
plugging in power tools that have the switch on
invites accidents.
d) Remove any adjusting key or wrench before
turning the power tool on. A wrench or a key left
attached to a rotating part of the power tool may result
in personal injury.
e) Do not overreach. Keep proper footing and
balance at all times. This enables better control of
the power tool in unexpected situations.
f ) Dress properly. Do not wear loose clothing or
jewellery. Keep your hair, clothing and gloves
awayfrom moving parts. Loose clothes, jewellery
or long hair can be caught in moving parts.
g) If devices are provided for the connection of
dust extraction and collection facilities, ensure
these are connected and properly used. Use of
these devices can reduce dust-related hazards.
4) Power tool use and care
a) Do not force the power tool. Use the correct
power tool for your application. The correct power
tool will do the job better and safer at the rate for
which it was designed.
b) Do not use the power tool if the switch does not
turn it on and off. Any power tool that cannot be
controlled with the switch is dangerous and must be
repaired.
c) Disconnect the plug from the power source
before making any adjustments, changing
accessories, or storing power tools. Such
preventive safety measures reduce the risk of
starting the power tool accidentally.
d) Store idle power tools out of the reach of children
and do not allow persons unfamiliar with the
power tool or these instructions to operate the
power tool. Power tools are dangerous in the hands
of untrained users.
e) Maintain power tools. Check for misalignment or
binding of moving parts, breakage of parts and
any other condition that may affect the power
tools operation. If damaged, have the power tool
repaired before use. Many accidents are caused by
poorly maintained power tools.
f ) Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges are
less likely to bind and are easier to control.
g) Use the power tool, accessories and tool bits
etc., in accordance with these instructions and in
the manner intended for the particular type of
power tool, taking into account the working
conditions and the work to be performed. Use of
the power tool for operations different from intended
could result in a hazardous situation.
5) Service
a) Have your power tool serviced by a qualified
repair person using only identical replacement
parts. This will ensure that the safety of the power tool
is maintained.

3
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.
• Arsenic and chromium from chemicallytreated 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.
1. ALWAYS USE PROPER GUARD WITH GRINDING
WHEEL. A guard protects operator from broken wheel
fragments. When using grinding wheel attachments,
the guard must always be attached to the tool and
positioned for maximum safety, so the least amount of
wheel is exposed from the side the tool is being
operated.
2. 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. Grinding wheels or any other accessory must
have a maximum safe operating speed greater than
the “no load speed” marked on the tool’s nameplate.
3. HOLD TOOL BY INSULATED GRIPPING
SURFACES WHEN PERFORMING AN OPERATION
WHERE THE CUTTING TOOLS 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.
4. BEFORE USING A GRINDER OR INSTALLING A
NEW WHEEL, INSPECT THE GRINDING WHEEL
FOR CHIPS AND CRACKS. Remove bad wheels
immediately. Run the tool at no load for one minute,
holding the tool in the direction away from people.
Wheels with flaws will normally break apart during this
time.
5. CAREFULLY HANDLE BOTH THE TOOL AND
INDIVIDUAL GRINDING WHEELS TO AVOID
CHIPPING OR CRACKING. Install a new wheel if tool
is dropped while grinding. Do not use a wheel that may
be damaged. Fragments from a wheel that bursts
during operation will fly away at great velocity possibly
striking you or bystanders.
6. DO NOT USE GRINDING WHEEL THAT IS LARGER
THAN THE MAXIMUM RECOMMENDED SIZE FOR
YOUR TOOL, OR WORN DOWN DAMAGED
WHEELS FROM LARGER GRINDERS. Wheels
intended for large angle sander/grinders are not
suitable for the high speed of a small angle
sander/grinder, these wheels may easily burst and the
fragments strike you or bystanders.
7. DO NOT USE DEPRESSED HUB GRINDING
WHEELS FOR CUT-OFF OPERATIONS.
8. DO NOT USE THIS TOOL WITH “WOODCARVING”
BLADE. Such blades create frequent kick-back and
loss of control.
9. WEAR PROPER APPAREL WHILE USING A
SANDER/GRINDER. Face shield or at least safety
goggles, dust mask, leather gloves and shop apron
capable of stopping small wheel or workpiece
fragments.
10. POSITION THE CORD CLEAR OF THE SPINNING
GRINDING WHEEL OR ANY OTHER SANDING
ACCESSORY. Do not wrap the cord around your arm
or wrist. If you lose control and have the cord wrapped
around your arm or wrist it may entrap you and cause
injury.
11. AVOID BOUNCING AND SNAGGING THE WHEEL,
ESPECIALLY WHEN WORKING CORNERS, SHARP
EDGES ETC. This can cause loss of control and
kick-back.
12. REGULARILY CLEAN THE TOOL’S AIR VENTS BY
COMPRESSED AIR. Excessive accumulation of
powdered metal inside the motor housing may cause
electrical failures.
13. DO NOT GRIND OR SAND NEAR FLAMMABLE
MATERIALS. Sparks from the wheel could ignite these
materials.
14. THIS TOOL CAN BE CONVERTED TO A SANDER.
When grinding is resumed the proper guard and wheel
flanges MUST be reinstalled before proceeding with
grinding. The guard must always be attached to the
tool and positioned for maximum safety, so the least
amount of wheel is exposed from the side the tool is
being operated. The grinding wheel guard cannot be
used for most sanding operations or for wire brushing.
15. WHEN SANDING, DO NOT USE OVERSIZED
SANDING DISC. Larger sanding disc will extend
beyond the sanding pad causing snagging, tearing of
the disc or kick-back. Extra paper extending beyond
the sanding pad can also cause serious lacerations.
16. WHEN SANDING CHEMICALLY PRESSURE
TREATED LUMBER, PAINT THAT MAY BE LEAD
BASED, OR ANY OTHER MATERIALS THAT MAY
CONTAIN CARCINOGENS, USE SPECIAL
PRECAUTIONS. A suitable breathing respirator must
be worn by all personal entering the work area. Work
area should be sealed by plastic sheeting and persons
not protected should be kept out until work area is
thoroughly cleaned.
17. DIRECT THE DISCHARGE OF THE SPINNING WIRE
BRUSH AWAY FROM YOU. Small particles and tiny
wire fragments may be discharged at high velocity
during the “cleaning” action with these brushes and
may become imbedded in your skin.
ANGLE GRINDER SAFETY PRECAUTIONS

4
INSTRUCTIONS FOR SAFE HANDLING
1. Make sure that the tool is only connected to the
voltage marked on the name plate.
2. Never use the tool if its cover or any bolts are missing.
If the cover or bolts have been removed, replace
them prior to use. Maintain all parts in good working
order.
3. Always secure tools when working in elevated
positions.
4. Never touch the blade, drill bit, grinding wheel or other
moving parts during use.
5. Never start a tool when its rotating component is in
contact with the workpiece.
6. Never lay a tool down before its moving parts have
come to a complete stop.
7. ACCESSORIES: The use of accessories or
attachments other than those recommended in these
instructions might present a hazard.
8. REPLACEMENT PARTS: When servicing use only
identical replacement parts.
DESCRIPITION
SPECIFICATIONS
ASSEMBLY
Voltage
Power input
No load speed
Grinding wheel
Spindle thread
Disc bore size
Net weight
230V ~ 50Hz
900W
11,000min-1
115mm
M14x2.0
22mm
2.0kg
1. Spindle lock
2. Switch button
3. Rear motor housing
WHEEL GUARD INSTALLATION
LOCK NUT AND BACKING FLANGE
WARNING!
4. Side handle
5. Wheel guard
6. Lock nut spanner
Wheel guard must be attached when using disc grinding
wheels. Always keep wheel guard between you and your
work while grinding.
WARNING! Do not use water or other cooling fluid with this
tool for cutting.
WARNING!
WARNING!
When using an abrasive cut-off wheel, be sure
to use only the special wheel guard designed
for use with cut-off wheels. Never use cut-off
wheel for side grinding.
Before attaching a backing pad be sure its
maximum safe operating speed is not exceeded
by the nameplate speed of the tool.
WARNING! Wheel guard may not be used for most sanding
operations. Always reinstall wheel guard when
converting back to grinding operations.
To attach the wheel guard DISCONNECT tool from power
source.
Position the guard on spindle neck, then secure guard with
the collar screw.
Your tool is equipped with a threaded spindle for mounting
accessories. Always use the supplied lock nut (and backing
flange) that has same thread size as spindle.
SIDE HANDLE
The side handle used to guide and balance the tool can be
threaded into the front housing on either side of the tool,
depending on personal preference and comfort. Use the
side handle for safe control and ease of operation.
DISC GRINDING WHEEL ASSEMBLY (Fig.1)
Disconnect tool from power source. Be sure that wheel
guard is in place for grinding. Thread BACKING FLANGE
onto spindle, then place GRINDING WHEEL on the spindle.
Thread on the lock nut and tighten nut using the supplied
lock nut spanner, while holding the spindle lock in.
TO REMOVE: Reverse procedure.
MASONRY CUTTING WHEEL ASSEMBLY (Fig. 2)
SANDING ACCESSORIES ASSEMBLY
TO INSTALL BACKING PAD AND SANDING DISC (Fig. 3)
TO REMOVE BACKING PAD AND SANDING DISC
For cutting masonry materials like brick, tile, stone, etc., it is
best to use a dry diamond cutting wheel.
Use only lock nut and flange with equal diameters.
Disconnect tool from power source before attaching cutting
wheel. With cut off wheel guard in place, assemble flange,
cutting wheel and lock nut. When cutting, make only small
passes through workpiece at a time.
Be aware that “Kickback” can occur at any time. Keep both
hands on tool for maximum control.
Disconnect tool from power source. Set the tool on its top
side (spindle up). Place the rubber backing pad onto the
spindle shaft. Center the sanding disc on top of the backing
pad. Insert the lock nut through the disc and thread onto the
spindle as far as you can with your fingers. Press in the
spindle lock, then tighten the backing pad securely with the
lock nut spanner.
Disconnect tool from power source. Using the lock nut
spanner unscrew the nut from the spindle, while holding
spindle lock in.
WIRE BRUSH ASSEMBLY
Before assembling wire brush to this tool, disconnect from
the power source. Wire brushes are equipped with their
own threaded hub, simply thread on to spindle. Be sure to
seat against shoulder before turning tool “ON”.

5
OPERATION
SLIDE ON-OFF SWITCH WITH LOCK (Fig. 4)
GRINDING OPERATIONS
SANDING TIPS
SANDING WOOD
SANDING METAL
WIRE BRUSH OPERATIONS
WARNING!
SANDING OPERATIONS
Selecting Grinding Wheels
Disc Grinding Wheels
Selecting Sanding Disc
Grinding Tips
The tool is switched “ON” by the switch button located at the
top of the motor housing. The switch can be locked in the
“ON” position, a convenience for long grinding operations.
To turn the tool “ON” without locking it, slide the switch
button forward by applying pressure ONLY at the REAR
portion of the button. When pressure is released the switch
button will snap to “OFF” position.
To lock the switch “ON”, slide the switch button forward and
press “IN” the FRONT portion.
To unlock the switch, simply press and release the REAR
portion of the button. Switch is spring loaded and will snap
back automatically.
Start the tool before applying to work and let the tool come
to full speed before contacting the workpiece. Lift the tool
from the work before releasing the switch. DO NOT turn the
switch “ON” and “OFF” while the tool is under load; this will
greatly decrease the switch life.
Grinding wheels should be carefully selected in order to use
the grinder most efficiently. Wheels vary in type of abrasive,
bond, hardness, grit size and structure. The correct type of
wheel to use is determined by the job. Use disc grinding
wheels for fast grinding of structural steel, heavy weld beads,
steel casting, stainless steel and other ferrous metals.
Efficient grinding is achieved by controlling the pressure and
keeping the angle between wheel and workpiece at 10° to
15°. If the wheel is flat, the tool is difficult to control. If the
angle is too steep, the pressure is concentrated on a small
area causing burning to the work surface.
When grinding with a new wheel be certain to grind while
pulling tool backwards until wheel becomes rounded on its
edge. New wheels have sharp corners which tend to “bite”
or cut into workpiece when pushing forward.
Sanding discs are made of extremely hard and sharp
aluminum oxide grits, phenol-resin bonded to a sturdy fiber
backing for fast heavy-duty service and long life. The discs
vary as to size and spacing of the abrasive grits. OPEN
COAT (type H) — used for soft materials and on paint or
varnish. CLOSED COAT (type K) —used for metal,
hardwood, stone, marble and other materials.
Sanding discs range in grit from 16 (very coarse) to 180
(very fine). To obtain best results, select sanding discs
carefully. Many jobs require the use of several grit sizes and
at times both “open coat and closed coat” discs are required
to get the job done faster. See chart for application examples.
For best results, tilt the Disc Sander at a 10° to 15° angle
while sanding so that only about 1" of the surface around
the edge of the disc contacts the work.
If sander is tilted too much, sanding action will be too great
and a rough cut surface or gouging and snagging will result.
Guide the Disc Sander with crosswise strokes. Be careful
not to hold the sander in one spot too long. Do not use a
circular motion, as this makes swirl marks. Test before use
on scrap stock.
Do not force or apply pressure when sanding. Use only the
weight of the tool for pressure. Excess pressure actually
slows the tool down. If faster stock removal is desired,
change to a coarser grit disc.
Remove gummy paint from metal with an “open coat” disc.
Sand until sparks start to appear, then stop and change to
a “closed coat” disc to remove any remaining paint.
When sanding wood the direction of the disc motion at the
contact point should parallel the grain as much as possible.
The rapid cut of discs and the swirl type scratch pattern they
occasionally create generally prohibit their use for producing
the final finish.
Scratches and circular marks are usually the result of using
too coarse a grit. When changing to a finer grit, move across
the sanding lines that were made by a previous coarser disc.
When sanding automobiles or appliances, wipe the metal
clean with a non-flammable solvent or commercial cleaner
to remove all wax and grease. By doing this first, the
sanding discs will sand better and last longer.
Wire brushes are intended to “clean” structural steel,
castings, sheet metal, stone and oncrete.
They are used to remove rust, scale and paint.
For heavy duty work, use a coarse grit disc first. Follow-up
with a medium grit to remove scratches. To produce smooth
finish, use fine grit disc.
If the disc (accessory) is held flat or the back
edge of the disc comes in contact with the work,
a violent thrust to the side may result.
Hold the tool with both hands while starting the
tool, since torque from the motor can cause the
tool to twist.
WARNING!
Before using a grinding wheel, be certain that
its maximum safe operating speed is not
exceeded by the nameplate speed of the
grinder. Do not exceed the recommended
wheel diameter.
WARNING!
Excessive or sudden pressure on the wheel will
slow grinding action and put dangerous
stresses on the wheel.
WARNING!
Avoid bouncing and snaging the wire brush,
especially when working corners, sharp edges
etc. This can cause loss of control and kick-back.
WARNING!
Operation: Refinishing painted wood or metal surfaces.
GRITREMARKS
To remove paint and to smooth
surface irregularities.
To remove scratches left by
previous discs.
Coarse
16-24-30
To smooth the rough sanding. Medium
36-50-80
Fine
100-120
To smooth surfaces for painting,
polishing or waxing.
Very fine
150-180

6
MAINTENANCE
To reduce the risk of injury, user must read
instruction manual ”
To ensure safety and reliability, all repairs should be
performed by an AUTHORIZED SERVICE CENTER or
other QUALIFIED SERVICE ORGANIZATION.
SAVE THESE INSTRUCTIONS FOR FUTURE
REFERENCE.
WARNING!
WARNING!
After use, check the tool to make sure that it is in top
condition. It is recommended that you take this tool to a
RYOBI Authorized Service Center for a thorough cleaning
and lubrication at least once a year.
DO NOT MAKE ANY ADJUSTMENTS WHILE THE
MOTOR IS IN MOTION.
ALWAYS DISCONNECT THE POWER CORD FROM THE
RECEPTACLE BEFORE CHANGING REMOVABLE OR
EXPENDABLE PARTS (BLADE, BIT, SANDING PAPER
ETC.), LUBRICATING OR WORKING ON THE UNIT.

RYOBI POWER EQUIPMENT
WARRANTY
Subject to the warranty conditions below, this
RYOBI tool (hereinafter called “the Product”),
is warranted by Ryobi (herein called “the
Company”) to be free from defects in material
or workmanship for a period of 24 months
from the date of original purchase covering
both parts and labour. Under the terms of
this warranty, the repair or replacement of
any part shall be the opinion of the Company
or its authorised agent. Should service
become necessary during the warranty
period, the owner should contact the
authorised Ryobi retailer from whom the
product was purchased, or the nearest
Company branch office. In order to obtain
warranty service, the owner must include the
Sales Docket and Warranty Certificate to
confirm date of purchase. This Product is
sold by the dealer or agent as principal and
the dealer has no authority from the Company
to give any additional warranty or guarantee
on the Company’s behalf except as herein
contained or herein referred to.
Warranty Conditions
This warranty only applies provided that the
Product has been used in accordance with
the manufacturer's recommendations under
normal use and reasonable care (in the
opinion of the Company) and such warranty
does not cover consumable components,
damage, malfunction or failure resulting from
misuse, neglect, abuse, or used for a purpose
for which it was not designed, or is not suited
and no repairs, alterations or modifications
have been attempted by other than an
Authorised Service Agent. This guarantee
will not apply if the tool is damaged by
accident or if repairs arise from normal wear
and tear.
Accessories such as bits,blades, sanding
discs, cutting lines, etc., are excluded from
this guarantee. Normal consumable parts,
such as carbon brushes, bearings, chucks,
cord assembly’s, spark plugs, recoil pulleys
and bump head assembly’s are specifically
excluded from this guarantee.
The Company accepts no additional liability
pursuant to this warranty for the costs of
traveling or transportation of the Product or
parts to and from the sevice dealer or agent
-which costs are not included in the warranty.
Nothing herein shall have the effect of
excluding, restricting or modifying any
conditions, warranty, right or liability imposed,
to the extent only that such exclusion,
restriction or modification would render any
term herein void.
THIS WARRANTY FORM
SHOULD BE RETAINED BY THE CUSTOMER AT ALL TIMES.
For your record and to assist in establishing date of purchase (necessary for in-warranty service), please
keep your purchase docket and this form, completed with the following particulars.
PURCHASED FROM:.........................................................................................................
ADDRESS OF DEALER:....................................................................................................
DATE:......................... MODEL NO................................ SERIAL NO.................................
Present this form with your Purchase Docket when Warranty Service is required.
STEVENS & CO (Pty) Ltd
604, 16th Street, Randjespark
Midrand, South Africa
Tel: [phone]
Fax: [phone]
email: [email protected]
P O Box 4059
HALFWAY HOUSE
1685, South Africa