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Page 7

OPERATION

ALWAYS WEAR SAFETY GOGGLES OR SAFETY
GLASSES WITH SIDE SHIELDS WHEN OPERATING YOUR
SANDER.
 To adjust sanding belt, connect sander to power
supply. Place sander in upside down position as shown in
Figure 7. NOTE: This position is for adjustments only. The
sander is not in an operating position. Pull switch trigger and
release immediately. Observe tracking of sanding belt. If the
sanding belt runs inward, turn the tracking screw clockwise.
If the sanding belt runs outward, turn the tracking screw
counterclockwise. This should be done until you are sure belt
will not run off sander, or come in contact with internal parts.
After installing a new sanding belt, it may become necessary
to change the adjustment several times until the belt becomes
pliable.

WARNING: IF SANDING BELT BEGINS TO WEAR
EXCESSIVELY ON THE INNER EDGE, READJUST
TRACKING SCREW. IT IS ADJUSTED TOO FAR
INWARD AND THE SANDING BELT IS RUBBING
AGAINST INTERNAL PARTS.

When you are sure the belt will not rub against internal
parts, start your sander and fine adjust the tracking
screw until the belt stablizes. 

See Figure 8.

When correctly adjusted, the outer edge of the belt  will
be even with the outer edge of the base of your sander.
Belt life will be greatly increased if a few seconds are
spent adjusting the belt tracking.

WARNING: KEEP HANDS AND FINGERS AWAY
FROM MOVING SANDING BELT. ANY PART 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: UNSECURED WORK COULD BE THROWN
BACK TOWARD OPERATOR CAUSING INJURY.

Before placing sander on work surface, squeeze the trigger
switch and let the motor reach its maximum speed, then
lower your sander to the work surface with a slight forward
motion. Using the rear handle to control your sander and the
front handle only to guide it, move it slowly over the work. 

See

Figure 9. Allowing your sander to remain in one place will
result in an uneven surface.

WARNING: KEEP A FIRM GRIP ON SANDER WITH
BOTH HANDS AT ALL TIMES. FAILURE TO DO SO
COULD RESULT IN LOSS OF CONTROL LEADING TO
POSSIBLE SERIOUS INJURY.

Your sander was designed to provide the proper weight on
the sanding belt. Extra pressure will result in uneven work,
clogged belts, and possible motor burnout. NOTE: The front
roller of your sander was not designed for contour sanding.
Sanding on the front roller could cause irregularity in sanding
belt tracking.

Use a coarser belt when heavy cutting is desired, not heavy
pressure. The importance of this cannot be  over-emphasized.
The weight has been built into the tool to give the most
efficient pressure at the proper location.

Fig. 9

Fig. 7

Fig. 8

SANDING BELT

TRACKING SCREW

TURN TRACKING SCREW
TO ADJUST SANDING BELT

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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