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Page 9

MAINTENANCE

CORD REPLACEMENT

DISCONNECT THE SANDER FROM POWER SUPPLY
WHILE REPLACING PARTS OR MAKING ADJUSTMENTS.
1. Remove handle cover and screws. NOTE THE

LOCATIONS OF ALL WIRING IN THE HANDLE AND
HOW EACH CONNECTION IS MADE TO THE CORD.
Connections and wiring position must be identical when
installing the new cord. 

See Figure 12.

2. Remove the cord clamp screws and cord clamp.
3. Lift the switch away from the handle. Release power cord

leads from the switch by loosening the two screws in the
switch body.

4. Remove the bend relief from the old cord and place it on

the new one.

5. Make new power cord lead connections to switch by

positioning leads in place and tightening the two screws on
the switch body. Pull on leads to check lead connections
with lead receptacles.

6. Position the switch in place, and arrange all wiring in the

handle so that it will not be pinched or contact screws when
the handle cover and screws are replaced. 

See Figure 12.

7. Arrange suppressor, connectors, and suppressor leads in

the handle so that they will not be pinched or contact
screws when the handle cover and screws are replaced.
See Figure 12.

8. Replace cord clamp, cord clamp screws, handle cover,

and handle cover screws.

9. Tighten all screws securely.

Fig. 12

SWITCH REPLACEMENT

DISCONNECT  THE SANDER FROM POWER SUPPLY  WHILE
REPLACING PARTS OR MAKING ADJUSTMENTS.
1. Remove the handle cover and screws. NOTE THE

LOCATIONS OF ALL WIRING IN THE HANDLE AND
HOW EACH CONNECTION IS MADE TO THE SWITCH.
Connections and wiring position must be identical when
installing the new switch. 

See Figure 12.

2. Lift the switch away from the handle. Release  power cord

leads from the switch by loosening the two screws in the
switch body.

3. Release motor leads from switch by inserting a small

diameter pin or nail into remaining switch lead receptacles.
See Figure 12.

4. Make 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 screws are replaced. 

See

Figure 12.

6. Arrange suppressor, connectors, and suppressor leads

in the handle so that they will not be pinched or contact
screws when the handle cover and screws are replaced.
See Figure 12.

7. Replace handle cover and screws.
8. Tighten all screws securely.

GENERAL

Avoid using solvents when cleaning plastic parts. Most
plastics are susceptible to various types of commercial
solvents and may be damaged by their use. Use clean cloths
to remove dirt, carbon dust, etc.
When electric tools are used on fiberglass boats, sports cars,
wallboard, spackling compounds, or plaster, it has been
found that they are subject to accelerated wear and possible
premature failure, as the fiberglass chips and grindings are
highly abrasive to bearings, brushes, commutator, etc.
Consequently it is not recommended that this tool be used
for extended work on any fiberglass material, wallboard,
spackling compounds, or plaster. During any use on these
materials, it is extremely important that the tool is cleaned
frequently by blowing with an air jet.

WARNING: 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.

WARNING: DO NOT AT ANY TIME LET BRAKE
F L U I D S ,   G A S O L I N E ,   P E T R O L E U M - B A S E D
PRODUCTS, PENETRATING  OILS, ETC., COME
I N   C O N T A C T   W I T H   P L A S T I C   P A R T S .   T H E Y
CONTAIN CHEMICALS THAT CAN DAMAGE,
WEAKEN, OR DESTROY PLASTIC.

 BEND RELIEF

SCREWS

SCREWS

HANDLE COVER

SCREWS

SCREW

SWITCH

SUPPRESSOR

CORD CLAMP

WHITE

BLACK

CONNECTOR

CLEAR (GROUND)

SUPPRESSOR

SWITCH

SCREW

BROWN

LIGHT BLUE

YELLOW

POWER CORD

SMALL DIAMETER

NAIL OR PIN

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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