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Page 5

OPERATION

WARNING: YOUR SANDER SHOULD NEVER BE
CONNECTED TO POWER SUPPLY WHEN YOU
ARE ASSEMBLING PARTS, CHANGING BELTS,
OR MAKING ADJUSTMENTS.

Fig. 2

SWITCH

The switch of your sander is equipped with a "lock-off"  button
that reduces the possibility of accidental starting. You must
depress and hold the "lock-off" button, pull the switch trigger,
then release the "lock-off" button. 

See Figure 2.

W A R N I N G :   B E F O R E   C O N N E C T I N G   Y O U R
SANDER TO POWER SUPPLY SOURCE, ALWAYS
MAKE SURE YOU DO NOT HAVE THE SWITCH
TRIGGER DEPRESSED IN THE "ON" POSITION.
F A I L U R E   T O   D O   S O   C O U L D   R E S U L T     I N
ACCIDENTAL STARTING OF YOUR SANDER
RESULTING IN POSSIBLE SERIOUS INJURY.

APPLICATIONS

(Use only for the purpose listed below)

Coarse, medium and fine sanding of wood, metals,
plastics and other materials.

Smoothing rough boards, chamfering, rounding edges
and many other general sanding applications.

Removing rust, paint, varnishes, and stains.

PREPARING FOR OPERATION

For ease of operation and maintaining proper control, your
sander has a front handle and a rear handle. These handles
allow two-hand operation which aid in maintaining control,
keeping sanding area level with workpiece, and keeping
hands clear of sanding belt. When operating your sander
always hold the front handle with your left hand and the rear
handle with your right hand as shown in Figure 2.

WARNING: KEEP HANDS AND FINGERS CLEAR
OF MOVING SANDING BELT, FRONT IDLER
P U L L E Y   A N D   D R I V E   R O L L E R   A S S E M B L Y .
FAILURE TO DO SO WILL RESULT IN THE
SANDING OF YOUR HANDS OR FINGERS.

See Figure 3.

WARNING: DO NOT LET YOUR FINGERS REST
OVER THE FRONT OR RIGHT EDGE OF THE
SANDER. IF THE SANDING BELT WERE TO RUN
OFF, OR IF IT WERE NOT PROPERLY ADJUSTED,
YOUR FINGERS COULD COME IN CONTACT WITH
THE MOVING SANDING BELT RESULTING  IN
POSSIBLE SERIOUS INJURY.

Always operate your sander as shown in Figure 2.

Fig. 3

SANDING BELT SELECTION

Selecting the correct size and type sanding belt is an extremely
important step in achieving a high quality sanded finish.
Standard 75 mm x 534 mm sanding belts made of aluminum
oxide, silicon carbide, and other synthetic abrasives are best
for power sanding. In general, coarse grit will remove the
most material and fine grit will produce the smoothest finish
in all sanding operations. The condition of the surface to be
sanded will determine which grit belt will do the job. If the
surface is rough, start with a coarse grit and sand until the
surface is uniform. Medium grit may then be used to remove
scratches left by the coarser belt and fine grit belt used for
finishing of the surface. Always continue sanding with each
grit belt until surface is uniform.

LUBRICATION

All of the bearings in this tool are lubricated with a sufficient
amount of high grade lubricant for the life of the unit under
normal operating conditions. Therefore, no further  lubrication
is required.

LOCK "OFF" BUTTON

REAR HANDLE

FRONT HANDLE

KEEP HANDS AND FINGERS
AWAY FROM THESE AREAS AT ALL TIMES

Summary of Contents for B850

Page 1: ...ured 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 CAUTION Carefully read through this entire owner s manual before using your new sander Pay close attention to the Rules for Safe Operation Warnings and Cautions If you use your sander properly and only for what it is intended you will en...

Page 2: ...ension cord 7 STORE IDLE TOOLS When not in use tools should be stored in a dry high or locked up place out of the reach of children 8 DON T FORCE TOOL It will do the job better and safer at the rate for which it was designed 9 USE RIGHT TOOL Don t force small tool or attachment to do the job of a heavy duty tool Don t use tool for purpose not intended for example Don t use a circular saw for cutti...

Page 3: ... have repaired by an authorized service center Stay constantly aware of cord location 26 INSPECT EXTENSION CORDS PERIODICALLY and replace if damaged 27 KEEP HANDLES DRY CLEAN AND FREE FROM OIL AND GREASE Always use a clean cloth whencleaning Neverusebrakefluids gasoline petroleum basedproductsorsolventstocleanyour tool 28 STAY ALERT Watch what you are doing and use common sense Do not operate tool...

Page 4: ...ial 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 Fig 1 WARNING WARNING DO NOT ALLOW FAMILIARITY WITH YOUR SANDER TO MAKE YOU CARELESS REMEMBER THAT A CARELESS FRACTION OF A SECOND IS SUFFICIENT TO INFLICT SEVERE INJURY The operation of any sander can result in foreign objects being thrown...

Page 5: ...ERS CLEAR OF MOVING SANDING BELT FRONT IDLER PULLEY AND DRIVE ROLLER ASSEMBLY FAILURE TO DO SO WILL RESULT IN THE SANDING OF YOUR HANDS OR FINGERS See Figure 3 WARNING DO NOT LET YOUR FINGERS REST OVER THE FRONT OR RIGHT EDGE OF THE SANDER IF THE SANDING BELT WERE TO RUN OFF OR IF IT WERE NOT PROPERLY ADJUSTED YOUR FINGERS COULD COME IN CONTACT WITH THE MOVING SANDING BELT RESULTING IN POSSIBLE SE...

Page 6: ...T BAG PROPERLY INSTALLED SAWDUST BEING THROWN INTO YOUR FACE AND EYES COULD RESULT IN POSSIBLE SERIOUS INJURY INSTALLING AND ADJUSTING SANDING BELT DISCONNECT SANDER FROM POWER SUPPLY WHILE ASSEMBLING PARTS OR MAKING ADJUSTMENTS To release the sanding belt lift tension release lever straight up as shown in figure 5 When sufficient force is exerted the spring will be compressed allowing the pulley ...

Page 7: ...OF YOUR BODY COMING IN CONTACT WITH MOVING BELT COULD RESULT IN SERIOUS INJURY DO NOT WEAR LOOSE CLOTHING OR JEWELRY WHEN OPERATING YOUR SANDER THEY COULD GET CAUGHT IN MOVING PARTS AND FOREIGN OBJECTS COULD GET THROWN AWAY FROM SANDER CAUSING INJURY TO OPERATE Clamp or otherwise secure the work to prevent it from moving under your sander WARNING UNSECUREDWORKCOULDBETHROWN BACK TOWARD OPERATOR CAU...

Page 8: ... 6 Reassemble belt cover and screws CAUTION NEVER ATTEMPT TO OPERATE YOUR SANDERWITHOUTBELTCOVERINPLACE FAILURE TO DO SO COULD RESULT IN POSSIBLE SERIOUS INJURY Fig 11 Fig 10 CAUTION Keep extension cords away from the sanding area and position the cord so that it will not get caught on lumber tools etc during sanding WARNING CHECK EXTENSION CORDS BEFORE EACH USE IF DAMAGED REPLACE IMMEDIATELY NEVE...

Page 9: ...ke lead connections to the new switch by positioning power cord leads in place and tightening the two screws on switch body Push motor leads as far as possible into the switch lead receptacles Pull on leads to check lead connections with lead receptacles 5 Position the switch in place and arrange the wiring in the handle so that it will not be pinched or contact screws when the handle cover and sc...

Page 10: ...50 1 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 20 21 22 23 38 39 40 41 42 43 44 45 46 47 48 47 49 50 51 52 53 54 55 56 57 58 59 28 60 61 28 62 63 64 65 66 67 68 69 31 61 70 6 10 12 75 71 72 73 74 25 26 27 28 29 30 31 32 33 34 35 36 37 15 15 14 24 24 ...

Page 11: ...1 39 Idler Roller Shaft 1 40 Yoke Assembly Includes Key No 32 1 41 Release Lever Assembly 1 42 Washer 1 43 Screw 10 32 x 1 2 in Pan Hd 1 44 75 mm x 534 mm Sanding Belt Complete Assortment Available at Your Nearest Catalog Order or Retail Store 1 45 Glamor Plate 1 46 Screw 10 32 x 7 8 in Pan Hd T F 2 47 Bushing 2 48 Torsion Spring 1 49 Tracking Knob 1 50 Spring 1 51 Washer 1 52 Gear Housing w Beari...

Page 12: ...on Be sure to provide all pertinent facts when you call or visit MODEL NO The model number of your Tool will be found on a plate attached to the motor housing HOW TO ORDER REPAIR PARTS WHEN ORDERING REPAIR PARTS ALWAYS GIVE THE FOLLOWING INFORMATION MODEL NUMBER PART DESCRIPTION B850 NAME OF ITEM 3 Dustless Belt Sander All parts listed may be ordered from any Ryobi Authorized Service Center or oth...

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