Ryobi Sander OSS500 User Guide

OPERATOR'S MANUAL  
Oscillating Spindle Sander  
OSS500 - Double Insulated  
Your new oscillating spindle sander has been engineered and manufactured to Ryobi's high standard for dependability,  
ease of operation, and operator safety. 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.  
Thank you for buying a Ryobi oscillating spindle sander.  
SAVE THIS MANUAL FOR FUTURE REFERENCE  
 
RULES FOR SAFE OPERATION  
USE OUTDOOR EXTENSION CORDS. When tool is  
Safe operation of this power tool requires that you read  
and understand this operator's manual and all labels  
affixed to the tool. Safety is a combination of common  
sense, staying alert, and knowing how your tool works.  
used outdoors, use only extension cords with ap-  
proved ground connection that are intended for use  
outdoors and so marked.  
DRESS PROPERLY. Do not wear loose clothing,  
gloves, neckties, rings, bracelets, or other jewelry  
that can get caught and draw you into moving parts.  
Nonslipfootwearisrecommended. Alsowearprotec-  
tive hair covering to contain long hair.  
ALWAYS WEAR SAFETY GLASSES WITH SIDE  
SHIELDS. Everyday eyeglasses have only impact-  
resistant lenses, they are NOT safety glasses.  
READ ALL INSTRUCTIONS  
KNOW YOUR POWER TOOL. Read the operator's  
manual carefully. Learn the tool's applications and  
limitations as well as the specific potential hazards  
related to this tool.  
KEEP THROAT PLATES IN PLACE and in working  
order.  
REMOVE WRENCH. Get in the habit of checking to  
see that the wrench is removed from the spindle  
before turning on the tool. Return the wrench, upper  
spindle washer(s), and throat plates to the storage  
area when not in use.  
KEEP WORK AREA CLEAN. Cluttered work areas  
and work benches invite accidents. DO NOT leave  
tools or pieces of wood on the tool while it is in  
operation.  
DO NOT USE IN DANGEROUS ENVIRONMENTS.  
Work in a well lit area. Do not use power tools near  
gasoline or other flammable liquids. Do not expose  
power tools to rain or damp or wet conditions.  
KEEP BYSTANDERS AWAY. Keep bystanders,  
children, and pets away while operating a power tool.  
Distractions can cause you to lose control.  
WEAR A DUST MASK to keep from inhaling fine  
particles.  
PROTECT YOUR HEARING. Wear hearing protec-  
tion during extended periods of operation.  
INSPECT WORK. Remove all nails from lumber  
before sanding.  
DIRECTION OF FEED. Feed the workpiece into the  
sanding sleeve against the direction of the sanding  
sleeve rotation only.  
DO NOT OVERREACH. Keep proper footing and  
balance at all times.  
MAINTAIN TOOLS WITH CARE. Keep tools sharp  
and clean for better and safer performance. Follow  
instructions for lubricating and changing accesso-  
ries.  
DISCONNECT ALL TOOLS when not in use, before  
servicing, or when changing attachments.  
AVOID ACCIDENTAL STARTING. Be sure switch is  
off when plugging in any tool.  
USE RECOMMENDED ACCESSORIES. Using im-  
proper accessories may risk injury.  
MAINTAIN 1/16 in. (1.6 mm) OR LESS between  
MAKE WORKSHOP CHILDPROOF with padlocks  
and master switches or by removing starter keys.  
DO NOT FORCE THE TOOL. It will do the job better  
and more safely at the rate for which it was designed.  
USE THE RIGHT TOOL FOR THE JOB. Do not force  
the tool or attachment to do a job for which it was not  
designed. Use it only the way it was intended.  
sanding drum and throat plate.  
USE THE PROPER EXTENSION CORD. Make sure  
your extension cord is in good condition. Use only a  
cord heavy enough to carry the current your product  
will draw. An undersized cord will cause a drop in line  
voltage resulting in loss of power and overheating. A  
wire gage size (A.W.G.) of at least 16 is recom-  
mended for an extension cord 25 feet or less in  
length. If in doubt, use the next heavier gage. The  
smaller the gage number, the heavier the cord.  
NEVER STAND ON TOOL. Serious injury could  
occur if the tool is tipped or if moving parts are  
unintentionally contacted.  
CHECK DAMAGED PARTS. Check any previously  
damagedpartsforproperoperationandperformance.  
Check alignment of moving parts, binding of moving  
parts, breakage of parts, tool stability, mounting and  
any other conditions that may affect its operation. A  
damaged part must be properly repaired or replaced  
by a qualified service technician at an authorized  
service center to avoid risk of personal injury.  
DO NOT ABUSE CORD. Never yank cord to discon-  
nect it from receptacle. Keep cord from heat, oil, and  
sharp edges.  
NEVER LEAVE TOOL RUNNING UNATTENDED.  
TURN THE POWER OFF. Do not leave tool until it  
comes to a complete stop.  
INSPECTTOOLCORDSANDEXTENSIONCORDS  
PERIODICALLY and, if damaged, have them re-  
paired by a qualified service technician at an autho-  
rized service center. Stay constantly aware of cord  
location and keep it well away from the moving parts  
of the tool.  
FIRMLY CLAMP OR BOLT the tool to a work-  
bench or table at approximately hip height.  
KEEPHANDSAWAYFROMSANDINGAREA.Keep  
hands away from the sanding sleeve. Do not reach  
underneath work or around sanding sleeve while  
spindle is rotating.  
3
 
RULES FOR SAFE OPERATION  
DO NOT USE TOOL IF SWITCH DOES NOT TURN  
WARNING:  
IT ON AND OFF. Have defective switches replaced  
by a qualified service technician at an authorized  
service center.  
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:  
KEEP TOOL DRY, CLEAN, AND FREE FROM OIL  
AND GREASE. Always use a clean cloth when  
cleaning. Never use brake fluids, gasoline, petro-  
leum-based products, or any solvents to clean tool.  
REPLACEMENT PARTS. All repairs, whether elec-  
trical or mechanical, should be made at your nearest  
authorized service center.  
• lead from lead-based paints,  
• crystalline silica from bricks and cement  
and other masonry products, and  
• arsenic and chromium from chemically-  
treated lumber.  
WHEN SERVICING, use only identical Ryobi re-  
placement parts. Use of any other parts may create  
a hazard or cause product damage.  
NEVER USE THIS TOOL IN AN EXPLOSIVE AT-  
MOSPHERE. Normal sparking of the motor could  
ignite fumes.  
POLARIZED PLUGS. To reduce the risk of electric  
shock, this tool has a polarized plug (one blade is  
wider than the other). This plug will fit in a polar-  
ized 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 the  
proper outlet. Do not change the plug in any way.  
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.  
NEVER USE THIS OR ANY POWER SANDER  
FOR WET SANDING. Failure to comply can result  
in electrical shock causing serious injury.  
DO NOT OPERATE THIS TOOL WHILE UNDER  
THE INFLUENCE OF DRUGS, ALCOHOL, OR  
ANY MEDICATION.  
STAY ALERT AND EXERCISE CONTROL. Watch  
what you are doing and use common sense. Do not  
operate tool when you are tired. Do not rush.  
ALWAYSTURNOFFTHETOOLbeforedisconnect-  
ing it to avoid accidental starting when reconnecting  
to power supply. NEVER leave the tool unattended  
while connected to a power source.  
SAVE THESE INSTRUCTIONS. Refer to them fre-  
quently and use them to instruct other users. If you  
loan someone this tool, loan them these instructions  
also.  
4
 
RULES FOR SAFE OPERATION  
The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols, and the  
explanations with them, deserve your careful attention and understanding. The safety warnings do not by  
themselves eliminate any danger. The instructions or warnings they give are not substitutes for proper accident  
prevention measures.  
SYMBOL  
MEANING  
DANGER: Failure to obey a safety warning will result in serious injury to yourself or to others.  
Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.  
WARNING: Failure to obey a safety warning can result in serious injury to yourself or to others.  
Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.  
CAUTION: Failure to obey a safety warning may result in property damage or personal injury to  
yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock  
and personal injury.  
WET CONDITIONS ALERT: Do not expose to rain or use in damp locations.  
NOTE: Advises you of information or instructions vital to the operation or maintenance of the  
equipment.  
SAVE THESE INSTRUCTIONS  
DOUBLE INSULATION  
ELECTRICAL CONNECTION  
Double insulation is a concept in safety in electric power  
tools, which eliminates the need for the usual three-wire  
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.  
Your 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 your tool does not operate when plugged  
into an outlet, double-check the power supply.  
WARNING:  
The double insulated system is intended to protect  
the user from shock resulting from a break in the  
tool’s internal wiring. Observe all normal safety pre-  
cautions to avoid electrical shock.  
Important: 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  
yournearestauthorizedservicecenterforrepair.Always  
use original factory replacement parts when servicing.  
5
 
SPECIFICATIONS  
Oscillating Range  
Oscillations Per Minute  
Spindle Size  
No Load Speed  
Input  
5/8 in. (15.9 mm)  
58 OPM  
1/2 in. (12.7 mm)  
2000 RPM  
120 Volts, 60 Hz, AC only, 3.5 Amps  
49 lbs. (22.2 kg)  
Weight  
UNPACKING  
If any parts are damaged or missing, please call  
INFORMATION  
1-800-525-2579 for assistance.  
We have shipped the oscillating spindle sander  
completely assembled and ready to use with a 1 in.  
(25.4 mm) rubber spindle, 7/8 in. (22.2 mm) upper  
spindle washer, 1 in. (26 mm) throat plate, and 80 grit  
1 in. (25.4 mm) sanding sleeve installed on the spindle.  
Inspect all parts carefully to make sure no breakage  
or damage occurred during shipping.  
WARNING:  
Remove the loose parts from the box. Make sure  
that all items listed in the loose parts list are in-  
cluded.  
If any parts are missing do not operate the tool until  
the missing parts are replaced. Failure to do so  
could result in serious personal injury.  
Remove the packing materials from around the tool.  
Lift the tool carefully from the box and place it on a  
LOOSE PARTS LIST  
level work surface.  
1. Sanding sleeves, 50, 80, 150 grit (17)  
2. Rubber spindles (4)  
3. Throat plates (5)  
NOTE: The sander is heavy. Ask for assistance if  
necessary.  
Do not discard the packing material until you have  
carefully inspected the tool, identified all loose parts,  
and satisfactorily operated the tool.  
4. Upper spindle washers (2)  
5. Wrench  
3
5
4
1
2
6
 
FEATURES  
Before using the oscillating spindle sander, familiarize  
TABLE SIZE  
yourself with all operating features and safety  
requirements.However,donotletfamiliaritywiththetool  
make you careless.  
The sanding table provides ample sanding space for  
most workpieces. The table top is 19-1/4 in. (489 mm)  
long x 15-3/4 in. (400 mm) wide.  
THROAT PLATES  
WARNING:  
Six throat plates are included with the sander. The throat  
plate provides a stable surface around the sanding  
sleeve and prevents objects from falling through the  
throat and damaging the spindle.  
Exercise caution when using the oscillating spindle  
sander. Careless actions, for even a fraction of a  
second, can result in serious personal injury.  
SWITCH  
DUST COLLECTION  
The ON/OFF switch has a built-in locking feature that  
requires you to insert a key before turning on the sander.  
PushingtheswitchtotheOFFpositionandremovingthe  
key secures the sander against unintentional use. This  
featureisintendedtopreventunauthorizedandpossible  
hazardous use by children and others.  
A standard 2-1/4 in. (57.2 mm) dust exhaust port is  
provided to help keep dust to a minimum. It is located  
under the table top on the back of the sander. The end  
of a standard shop vacuum hose fits tightly inside the  
dust exhaust port.  
THROAT PLATE/WRENCH STORAGE AREA  
A throat plate and wrench storage area is located on the  
left side of the cabinet.  
WARNING:  
Always lock the switch OFF when the sander is not  
in use. Remove the key and keep it in a safe place.  
In the event of a power failure, turn the switch OFF  
and remove the key. This action will prevent the  
sander from accidentally starting when power re-  
turns.  
SANDING SLEEVE/RUBBER SPINDLE  
STORAGE AREA  
A sanding sleeve and rubber spindle storage area is  
located on the right side of the cabinet. Store unused  
sandingsleevesandrubberspindlesontheirdesignated  
pins. Proper storage of sanding sleeves and rubber  
spindles helps protect them from being damaged and  
getting lost.  
MOTOR  
The sander has a 3.5 amp motor with sufficient power to  
handle tough sanding jobs. It develops a no load speed  
of 2,000 RPM and 58 OPM.  
EXTRA SANDING SLEEVE/WASHER  
STORAGE AREA  
Store extra sanding sleeves and upper spindle washers  
under the table in either of the cavities.  
OSCILLATING MOTION  
As the name implies, the most unique feature of this  
sander is the fact that it oscillates. This means that the  
spindle rises and falls as it rotates. The oscillating range  
for the sander is 5/8 in. (15.9 mm).  
SANDING CAPACITIES  
The sander accepts sanding sleeves that are 1/2 in.  
(12.7 mm) through 3 in. (76.2 mm) in diameter and  
4-1/2 in. (114.3 mm) in height.  
NOTE: Sanding sleeves are 4-1/2 in. (114.3 mm) tall;  
however, you can only sand material up to 3-11/16 in.  
(93.7 mm) thick.  
The 1/2 in. (12.7 mm) sanding sleeve fits directly on the  
1/2in. (12.7mm)spindleandrequiresnorubberspindle.  
It is secured in place with a washer and hex nut on top  
of the spindle. All other sanding sleeves require a rubber  
spindle to secure them in place. These rubber spindles  
fit on the spindle and require a throat plate and sanding  
sleeve.Awasherandhexnutthreadontopofthespindle  
to hold everything in place.  
7
 
FEATURES  
HEX NUT  
SPINDLE  
UPPER  
SPINDLE  
WASHER  
SANDING SLEEVE  
(1 in. (25.4 mm))  
TABLE TOP  
EXTRA SANDING  
SLEEVE/WASHER  
STORAGE AREA  
THROAT  
PLATE  
WRENCH  
STORAGE  
AREA  
SWITCH  
THROAT PLATE  
STORAGE AREA  
DUST  
EXHAUST  
PORT  
EXTRA SANDING  
SLEEVE/WASHER  
STORAGE AREA  
SANDING SLEEVE/  
RUBBER SPINDLE  
STORAGE AREA  
Fig. 1  
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.  
8
 
ADJUSTMENTS  
SELECTING THROAT PLATES/UPPER  
SPINDLE WASHERS  
WARNING:  
The sander should never be connected to a power  
supply when you are assembling parts, making ad-  
justments, cleaning, or when not in use. Disconnect-  
ing the tool will prevent accidental starting that could  
cause serious personal injury.  
See Figure 2.  
Six throat plates are provided with this sander. Each  
throat plate indicates the correct sanding sleeve/rubber  
spindle size to use.  
The chart below identifies the relationship between  
sandingsleeves/rubberspindles,throatplates,andupper  
spindle washers.  
SELECTING SANDING SLEEVES  
Selecting the correct size diameter, correct size grit, and  
correct type sanding sleeve is an extremely important  
step in achieving a high quality sanded finish. Aluminum  
oxide, silicon carbide, and other synthetic abrasives are  
best for power sanding. Natural abrasives, such as flint  
and garnet are too soft for power sanding.  
WARNING:  
Failure to use the correct size throat plate with its  
matching sanding sleeve could result in fingers being  
pinched or the workpiece being pulled down between  
the throat plate and the sanding sleeve.  
In general, when sanding, coarse grit removes the most  
material and fine grit produces the best finish. The  
condition of the surface to be sanded determines which  
grit will do the best job. If the surface is rough, start with  
a coarse grit and sand until the surface is uniform. Then  
use medium grit to remove scratches left by the coarser  
grit.Finally,usefinergritforfinishingthesurface.Always  
continue sanding with each grit until the surface is  
uniform.  
SANDING  
SLEEVE  
THROAT  
PLATE  
NOTE: Do not use the sander without a sanding sleeve.  
Doing so will damage the rubber spindle.  
Select and install the desired sanding sleeve for your  
particularapplication. Asmentionedpreviously, youcan  
use sanding sleeves from 1/2 in. (12.7 mm) to 3 in.  
(76.2 mm) in diameter with this sander. Choose one that  
is close in size to the workpiece you are sanding.  
THROAT  
PLATE  
OPENING  
Fig. 2  
Sanding Sleeve/Rubber Spindle  
1/2 in. (12.7 mm)  
Throat Plate  
Upper Spindle Washer  
.5” (13 mm)  
5/8 in. (15.9 mm)  
7/8 in. (22.2 mm)  
7/8 in. (22.2 mm)  
7/8 in. (22.2 mm)  
1-13/16 in. (46 mm)  
1-13/16 in. (46 mm)  
3/4 in. (19.1 mm)  
.75” (19 mm)  
1” (26 mm)  
1.5” (38 mm)  
2” (51 mm)  
3” (76 mm)  
1 in. (25.4 mm)  
1-1/2 in. (38.1 mm)  
2 in. (50.8 mm)  
3 in. (76.2 mm)  
9
 
ADJUSTMENTS  
REMOVING SANDING SLEEVES  
See Figure 3.  
Follow these directions to remove sanding sleeves.  
WRENCH  
Unplug the sander.  
TO LOOSEN  
WARNING:  
Failure to unplug the tool could result in accidental  
starting causing serious injury.  
SANDING  
SLEEVE  
Grasp and hold the sanding sleeve on the spindle.  
THROAT  
PLATE  
Loosen the hex nut using the wrench provided.  
TO TIGHTEN  
NOTE: If the hex nut is too tight and the spindle shaft  
spins inside the sanding sleeve, grasp the flats on  
top of the spindle shaft with a 1/4 in. wrench (not  
provided) and loosen the hex nut.  
Fig. 3  
Remove the hex nut, upper spindle washer, sanding  
sleeve, rubber spindle, and throat plate.  
HEX NUT  
NOTE: It is recommended that you clean dust  
accumulations from the throat plate, throat plate nest,  
and under the lower spindle washer after each use.  
Remove the lower spindle washer and clean dust  
accumulations.  
THROAT  
PLATE  
UPPER  
SPINDLE  
WASHER  
SANDING  
SLEEVE  
RUBBER  
SPINDLE  
INSTALLING SANDING SLEEVES  
(All except 1/2 in. (12.7 mm))  
LOWER  
SPINDLE  
WASHER  
See Figure 4.  
WRENCH  
Follow these directions to install sanding sleeves.  
Unplug the sander.  
SPINDLE  
WARNING:  
Failure to unplug the tool could result in accidental  
starting causing serious injury.  
Place the lower spindle washer over the spindle, fin  
Fig. 4  
side down.  
NOTE: Always install the fin side of the washer  
down. The fins help push dust through the dust  
exhaust port opening, preventing buildup of dust.  
Dust in this area may cause the oscillating motion to  
stop. Always use the lower spindle washer with all  
sanding sleeves.  
Install the upper spindle washer and hex nut.  
NOTE: Use the 7/8 in. (22.2 mm) washer for the 3/4  
in. (19.1 mm), 1 in. (25.4 mm), and 1-1/2 in.  
(38.1 mm) rubber spindles. Use the 1-13/16 in.  
(46 mm) washer for the 2 in. (50.8 mm) and 3 in.  
(76.2 mm) rubber spindles.  
Select and install the correct throat plate. Refer to  
SELECTING THROAT PLATES/UPPER SPINDLE  
WASHERS earlier in this manual.  
Grasp and hold the sanding sleeve on the spindle.  
Tighten the hex nut using the wrench provided.  
Select and install the correct rubber spindle.  
Install the appropriate sanding sleeve on the rubber  
NOTE: Tighten the hex nut only enough to expand  
the rubber spindle against the inner wall of the  
sanding sleeve. Do not overtighten.  
spindle.  
NOTE: If the sanding sleeve becomes difficult to  
remove or install, apply talcum powder on the rubber  
spindle or inside the sanding sleeve before installing  
the sanding sleeve on the rubber spindle.  
Return the wrench to the storage area.  
10  
 
ADJUSTMENTS  
INSTALLING 1/2 INCH (12.7 mm) SANDING  
SLEEVES  
See Figure 5.  
HEX NUT  
UPPER  
SPINDLE  
WASHER  
SANDING  
SLEEVE  
Follow these directions to install 1/2 inch (12.7 mm)  
sanding sleeves.  
THROAT  
PLATE  
Unplug the sander.  
WARNING:  
Failure to unplug the tool could result in accidental  
starting causing serious injury.  
WRENCH  
LOWER  
SPINDLE  
WASHER  
SPINDLE  
Place the lower spindle washer over the spindle, fin  
side down.  
NOTE: Always install the fin side of the washer  
down. The fins help push dust through the dust  
exhaust port opening, preventing buildup of dust.  
Dust in this area may cause the oscillating motion to  
stop. Always use the lower spindle washer with all  
sanding sleeves.  
Fig. 5  
Install the throat plate with the .5 in. (13 mm) opening.  
Install the 1/2 in. (12.7 mm) sanding sleeve on the  
spindle shaft.  
NOTE: Mount the sanding sleeve directly onto the  
spindle shaft. A rubber spindle is not required.  
Install the 5/8 in. (15.9 mm) upper spindle washer  
and hex nut.  
Grasp and hold the sanding sleeve on the spindle.  
Tighten the hex nut using the wrench provided.  
NOTE: Tighten the hex nut securely. Do not  
overtighten.  
Return the wrench to the storage area.  
11  
 
OPERATION  
WARNING:  
Always wear safety goggles or safety glasses with  
side shields when operating this tool. Failure to do  
so could result in dust, shavings, or loose particles  
being thrown into your eyes, resulting in possible  
serious injury.  
MOUNTING THE SANDER TO A WORK  
SURFACE  
See Figures 6 and 7.  
Follow these directions to mount the sander to a work  
surface.  
Place the sander on a sturdy work surface, e.g.,  
work stand, workbench, counter top.  
Mark the holes in the sander base with a pencil.  
Remove the sander from the work surface.  
Drill three holes through the work surface.  
Fig. 6  
Place the sander back on the work surface, aligning  
the holes in the base with the holes in the work  
surface.  
NOTE: If the sander does not appear to be stable,  
make sure the rubber stabilizers are intact on the  
sander bottom.  
Insert three bolts (not included, 1/4 in. (6.4 mm)  
machine bolts recommended) and tighten securely  
with lock washers and hex nuts (not included).  
Check the work surface carefully after you mount  
the sander to make sure that no movement can  
occur during use. If you notice any tipping, sliding,  
or walking, secure the work surface to the floor  
before operating the tool.  
Fig. 7  
NOTE: If you plan to transport the sander to different  
locations, we recommend that you attach it  
permanently to a mounting board that you can easily  
clamp to a work surface.  
12  
 
OPERATION  
OPERATING THE SANDER  
See Figures 8 and 9.  
SWITCH KEY  
Follow these directions to operate the sander.  
Insert the switch key.  
Turn on the sander by lifting the switch.  
Let the motor build to its full speed.  
Feed the workpiece gradually against the sanding  
sleeve from right to left.  
WARNING:  
Do not let the workpiece contact the sanding sleeve  
before you turn on the sander and allow it to develop  
full speed.  
SWITCH  
Fig. 8  
WARNING:  
When you feed the workpiece from right to left, the  
rotation of the sanding sleeve sands against the  
workpiece. If you feed the workpiece in the opposite  
direction, the rotation forces of the spinning sanding  
sleeve tends to bounce the workpiece away from the  
sanding sleeve. This action could cause you to lose  
control of the workpiece.  
COLLECTING DUST  
See Figure 10.  
A dust exhaust port is provided to help keep dust to a  
minimum. It is located under the table top on the back of  
thesander. Theendofastandardshopvacuumhosefits  
tightly inside the dust exhaust port.  
Fig. 9  
Even with a dust collection system, it is important to  
periodically clean sanding dust from the throat plate  
area. After extended use, sanding dust builds up under  
the throat plate and forces its way into the throat plate  
nest. Sanding dust build up in this area may cause the  
throat plate surface to rise above the table surface.  
TRANSPORTING THE SANDER  
In a portable application, you can lift and carry the  
sander by the table top. When carrying the sander, be  
careful not to dislodge the throat plates, wrench, and  
upper spindle washers from their respective storage  
areas. Also, be careful not to lose any parts when  
transporting.  
Fig. 10  
13  
 
MAINTENANCE  
WARNING:  
When servicing use only identical Ryobi replacement parts. Use of any other parts may create a hazard or cause  
product damage.  
GENERAL  
WARNING:  
Avoid using solvents when cleaning plastic parts. Most  
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.  
plastics are susceptible to damage from various types of  
commercial solvents and may be damaged by their use.  
Use clean cloths to remove dirt, carbon dust, etc.  
WARNING:  
LUBRICATION  
Do not at any time let brake fluids, gasoline, petro-  
leum-based products, penetrating oils, etc. come in  
contact with plastic parts. They contain chemicals  
that can damage, weaken, or destroy plastic.  
All the bearings in this tool are lubricated with a sufficient  
amount of high grade lubricant for the life of the unit  
undernormaloperatingconditions.Therefore,nofurther  
lubrication is required.  
Electric tools used on fiberglass material, wallboard,  
spackling compounds, or plaster are subject to  
accelerated wear and possible premature failure, as the  
fiberglass chips and grindings are highly abrasive to  
bearings, brushes, commutators, etc. Consequently, we  
do not recommend that this tool be used for extended  
work on these types of materials. If, however, you do  
workwithanyofthesematerials,itisextremelyimportant  
that you clean the tool frequently by blowing it with an air  
jet.  
NOTE: Only use this sander for sanding wood and  
plastics.  
14  
 
NOTES  
15  
 
OPERATOR'S MANUAL  
Oscillating Spindle Sander  
OSS500 - Double Insulated  
**Ampere rating  
EXTENSION CORD CAUTION  
(on tool faceplate)  
0-2.0  
2.1-3.4  
3.5-5.0  
5.1-7.0  
7.1-12.0 12.1-16.0  
When using a power tool at a considerable distance from a  
power source, be sure to use an extension cord that has the  
capacity to handle the current the tool will draw. An under-  
sized cord will cause a drop in line voltage, resulting in over-  
heating and loss of power. Use the chart to determine the mini-  
mum wire size required in an extension cord. Only round jack-  
eted cords should be used.  
Cord Length  
Wire Size (A.W.G.)  
25'  
50'  
16  
16  
16  
16  
16  
16  
16  
14  
14  
14  
14  
12  
CAUTION: 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.  
When working with a tool outdoors, use an extension cord  
that is designed for outside use. This is indicated by the letters  
"WA" on the cord's jacket.  
**Used on 12 gauge - 20 amp circuit.  
Before using any extension cord, inspect it for loose or ex-  
posed wires and cut or worn insulation.  
• SERVICE  
Now that you have purchased your tool, should a need ever exist for repair parts or  
service, simply contact your nearest Ryobi Authorized Service Center. Be sure to  
provide all pertinent facts when you call or visit. Please call 1-800-525-2579 for your  
nearest Ryobi Authorized Service Center. You can also check our Web site at  
• MODEL NO. AND SERIAL NO.  
The model number and serial number of this product are found on the label attached to the  
rear of the cabinet. Please record the serial number in the space provided below.  
• HOW TO ORDER REPAIR PARTS  
WHEN ORDERING REPAIR PARTS,  
ALWAYS GIVE THE FOLLOWING INFORMATION:  
OSS500  
• MODEL NUMBER  
• SERIAL NUMBER  
RYOBI TECHNOLOGIES INC.  
1428 Pearman Dairy Road  
Anderson, SC 29625  
Post Office Box 1207  
Anderson, SC 29622  
Phone 1-800-525-2579  
983000-146  
9-02  
 

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