Specifications

Finishing Sander

Double Insulation Variable Speed (BO4900V)
A worlds leading manufacturer of power tools

Double Insulation

Hook & Loop (BO4900V, BO4900)

Dimensions

Dust Collecting

Variable Speed (BO4900V)

190 mm (7-1/2")
Pad size Abrasive paper size Clamp Hook & loop* Continuous rating Input Orbits per minute (min-1) Sanding stroke rate (min-1) Orbit dia. Overall length Net weight Power supply cord
115 mm x 229 mm (4-1/2 x 9) 115 mm x 280 mm (4-1/2 x 11) 115 mm x 232 mm (4-1/2 x 9-1/8) 330 W 4,000 10,000 (BO4900V) 10,000 (BO4900, BO4901) 8,000 20,000 (BO4900V) 20,000 (BO4900, BO4901) 2.6 mm 289 mm (11-3/8) 2.8 kg (2.6 lbs) 2.5 m (8.2 ft.)

289 mm (11-

3/8")
Model BO4900V, BO4900, BO4901

115 mm (4-1/2")

* Model BO4901 use with pad set (optional accessory) Specifications may differ from country to country.

Standard equipment

North America Other Countries Part No. Part No. 193522-8 193521-0 193524-4 193523-6 193525-2 193294-5 A-14093 (10pcs per pkg.) Pad set (For model BO4901) Pad set (hook & loop) (For model BO4900V, BO4900) Paper dust bag holder (For model BO4900V, BO4900) Paper dust bag holder comes with a paper dust bag. Abrasive paper #120 (pre-punched) 1pc.
Newest Finishing Sanders from Makita Minimized Vibration, Ergonomic Handles and Efficient Dust Collection System for More Comfortable and More Controlled Operations.
Items of standard equipment may differ from country to country.

Optional accessories

Abrasive paper (10per pkg.) Grit Part No. 794210-6 794470-0 794209-1 794212-2 794213-0 794211-1 A-14065 A-14071 A-14087 A-14093 A-14102 A-14118 A-14124 A-14130 A-14146 A-14152 A-14168 A-14174 A-14180 A-14196 Dust bag complete
Part No. 151517-7 Paper dust bag (5per pkg. ) Part No. North America Other Countries Punch plate Part No. 193526-0 193293-7
Abrasive paper (10per pkg. Pre-punched)
Abrasive paper (5per pkg. Pre-punched, hook & loop)
Part No. 192523-3 Part No. 151518-5 192349-3 417408-5

PHOTO: Model BO4900V

Dust nozzle complete Joint 25 Joint (for Festo)

Makita Corporation

3-11-8, Sumiyoshi-cho, Anjo, Aichi 446-8502, Japan
PRINTED IN JAPAN Z14316-2 2002-2

Model BO4900V

Model BO4900

Model BO4901

Ergonomic design and powerful 330W motor for superior handling and ultra smooth finishes.
1. Soft grip handle provides a non-slip surface for comfortable operation (Model BO4900V only) 2. Variable Speed Control (Model BO4900V only)
Variable Speed Control Dial allows you to select the optimum speed for the material of work piece.
Performance Data Note: It may differ under some conditions.

Volume of sanding

Photo: Model BO4900V
Work piece : spruce With abrasive paper #120
Makita BO4900V / BO4900 / BO4901 Competitor "F" Competitor "B"
3. Ergonomic Grip & Housing top 4. Large Clamping Lever 5. Hook-and-Loop abrasive paper 6. Through-the-Pad Dust Collection System
Extra-efficient dust collection for dust-free operation: Powerfull suction through 10 pre-punched holes of abrasive paper and pad into dust bag or vacuum cleaner.

100 90

110 Fast
FESTO and BOSCH abrasive papers can be used for BO4900V and BO4900. Papers for Makita 9046 are also applicable for these two models.
7. Easy connecting with vacuum cleaner
Can be connected to 28 mm hose without any attachment.
Numbers in chart are relative values when setting competitor "F's" capacity as 100.
The knob-style front handle and the low housing top of round design fit your palms perfectly for easy and comfortable handling.
8. Paper dust bag (Model BO4900V, BO4900)
For easy disposal of collected dust.
For quick and easy changing of abrasive paper.

ECHNICAL INFORMATION

BO4900V, BO4900, BO4901 Finishing Sander

Model No. Description

PRODUCT P 1 / 14
CONCEPT AND MAIN APPLICATIONS
The above finishing sanders are the advanced version of Model 9045N or 9045B. Their features and benefits are H * Incredible minimized vibration * Large clamping lever for quick and easy changing abrasive paper * Palm-fitting soft grip W * More efficient dust collection system * Both paper clamp type and hook and loop type of abrasive papers are applicable. (For model BO4901, pad complete which is an optional accessory, is required for attaching hook and loop type abrasive paper.)
L Dimensions : mm ( " ) Length ( L ) 289 (11-3/8) Height ( H ) 190 (7-1/2) Width ( W ) 115 (4-1/2)

Specification

Voltage (V) 240 Current (A) 3.2 2.9 1.6 1.5 1.4 Cycle (Hz) 50 / / / / / 60 Continuous Rating (W) Input Output Max. Output(W) 200
Model No. BO4900V BO4900 BO4901 Pad size : mm ( " ) 115 x 229 (4-1/2 x 9) Paper size : mm ( " ) 115 x 280 (4-1/2 x 11) 115 x 232 (4-1/2 x 9-1/8) Clamp type Yes Yes Yes Paper type Yes Yes Yes* Hook and loop Orbit per min : opm = min-1 4,000 - 10,000 10,000 Orbit diameter : mm ( " ) 2.6 (3/32) Stroke per min. : spm = min-1 8,000 - 20,000 20,000 Speed control dial Yes No Dust Integrated Yes Yes collecting with vacuum cleaner Yes By double insulation Protection from electric shock Cord length : m ( " ) For Europe : 4.0 (13.1) For Australia : 2.0 (6.6) For others : 2.5 (8.2) Net weight : Kg (lbs) 2.8 (6.2) *Note: Optional Pad complete is required.

Standard equipment

* Abrasive paper (grit 120).... 1 pc. * Paper pack set (Paper pack holder and paper pack) for dust collecting. 1 pc. < Note > The standard equipment for the tool shown may differ from country to country.

Optional

accessories
* Clamp type abrasive papers w/o punched holes (10 pcs. per pack), grit 60, 80, 100, 120, 150, 180, * Clamp type abrasive papers w/ punched holes (10 pcs. per pack), grit 60, 80, 100, 120, 150, 180, 240 * Hook and loop type abrasive papers w/ punched holes (5 pcs. per pack), grit 60, 80, 100, 120, 150, 180, 240
* Clamp type pad * Hook and loop type pad * Punch plate * Dust bag (made of paper) * Dust bag (made of cloth) * Paper pack set * Hose complete 28 set * Joint 25

Features

and benefits
Ergonomic knob style front grip and round designed low height housing top fit your palms perfectly for easy and comfortable handling. Electric speed control dial for selecting optimum speed. (BO4900V only) Palm-fitting soft grip (BO4900V only)

P 2 / 14

Large clamping lever for easy and quick change of abrasive paper, when attaching abrasive papers of clamp type. More efficient "Through the Pad Dust Collection System" The same hook and loop type papers for our 9046 or FESTO's model can be attached. (only Mod.BO4900 and BO4900V)
Paper dust bag for easy disposal of collected dust (only for BO4900 and BO4900V)
Easy to connect with vacuum cleaner. 28mm hose can be connected without any attachment. Vibration depressed to the incredible low level, with the newly improved balancer. See the illustration below. The conventional balancing
The vibration of finishing sander is mostly produced by the orbital action of base. In order to suppress it, a balancer is so equipped at the axis, that its center of gravity comes to the opposite side of the center of gravity of base. In the conventional balancing system, it was difficult to suppress the vertical vibration. Because, the both centers of gravity are not on the same level as illustrated in Fig. A. Center of gravity of base This difference produces the vertical vibration.
Center of gravity of balancer
Fig. A The balancing in BO4900V, BO4900 and BO4901 In case of BO4900V, BO4900 and BO4901, even the vertical vibration is suppressed by the new formed balancer, by bringing both centers of gravity to the same level as illustrated in Fig. B.
The both centers of gravity are on the same surface.
Center of gravity of base

Fig. B

Comparison

of products

Integrated dust collecting type Competitor A Competitor B MAKITA a: BO4900 a: As 9045N B-1 b; BO4900V b; Av 330 a; 10,000 b; 4,000 10,000 a; 20,000 b; 8,000 20,000 2.6 (3/32) Hook and Loop a; No b; Yes a; No b; Yes 1.7 2.(11-3/8) 115 (4-1/2) 190 (7-1/2) 2.8 (6.2) 520 10,a; 10,000 b; 4,000 10,000 a; 20,000 b; 8,000 20,000 2.6 (3/32) Hook and Loop No a; No b; Yes 5.6 1.(11-5/8) 115 (4-1/2) 192 (7-9/16) 2.5 (5.5) 330 5,500 11,000 11,000 22,000 2.4 (3/32) Hook and Loop Yes Yes 2.3 5.(11-3/4) 115 (4-1/2) 191 (7-1/2) 2.6 (5.7)

P 3 / 14

Model No.
Specifications Power input : W Orbit per min : opm.( min.-1 ) Stroke per min : spm.( min.-1 ) Orbit diameter: mm ( " ) Paper type Palm fitting soft grip Speed control Vibration No Load : m/sec.2 * Loaded No Load Noise : dB (A) * Loaded Dimensions Length : mm (") Width : mm (") Height : mm (")
Competitor C Competitor D a: Cs D-1 b; Cv 350 a; 11,000 b; 6,000 11,000 a; 22,000 b; 12,000 22,000 2.5 (3/32) Hook and Loop Yes a; No b; Yes 6.1 5.(11-1/4) 112 (4-3/8) 191 (7-1/2) a: 2.7 (6.0) b: 2.8 (6.2) 300 10,000
20,000 2.4 (3/32) Sheet No No 8.7 6.(10-1/2) 132 (5-3/16) 160 (6-5/16) 2.8 (6.2)

20,000

Sheet No No 5.5 9.(11-3/4) 115 (4-1/2) 183 (7-3/16) 2.8 (6.2)

Net weight : kg (lbs)

* The figures about vibration and noise are based on our own measurement. * Loaded : Pressure load 50 N.m (5.1 kgf) is added to the products. Model No. Specifications Power input : W Orbit per min : opm.( min.-1 ) Stroke per min : spm.( min.-1 ) Paper attaching system Palm fitting soft grip Speed control No Load Vibration : m/sec.2 * Loaded Noise : dB (A) Dimensions No Load * Loaded Dust collecting with No dust collecting vacuum cleaner MAKITA BO4901 9045B 10,000 10,000 20,000 2.6 (3/32) Paper clamp No No * 3.4 * 4.(11-3/8) 115 (4-1/2) 190 (7-1/2) 2.8 (6.2) 240 (9-1/2) 115 (4-1/2) 160 (6-5/16) 2.6 (5.7) 20,000 2.4 (3/32) Paper clamp No No * Loaded : Pressure load 50 N.m (5.1 kgf) is added to the products. * 3.4 and * 4.5 : The vibration of BO4901 is a little bit bigger than BO4900V and BO4900, because the weight of pad for BO4901 is different from BO4900V and BO4900.

Length : mm ( " ) Width : mm ( " ) Height : mm ( " ) Net weight : kg (lbs)

P 4 / 14

Comparison in dust collection (Suction rate) Material : Spruce produced in USA. Grit : 60 MAKITA BO4900 BO4900V 35% 80% 70% 60% 70% 0% 20% 40% 60% 80% 100% 0% 20% 80% Material : Kwila produced in Malaysia (Hard wood) Grit : 60 85% 55% 80% 85% 85% 80% 40% 60% 80% 100%
MAKITA 9045N Competitor A Av Competitor B B-1 Competitor C Cv Competitor D D-1
Material : Spruce produced in USA. Grit : 120 BO4900 BO4900V 35% 75% 75% 55% 65% 0% 20% 40% 60% 80% 75%
Material : Kwila produced in Malaysia (Hard wood) Grit : 120

MAKITA

80% 35% 75% 65% 60% 70% 100% 0% 20% 40% 60% 80% 100%
Comparison in sanding work Numbers in chart below are relative values when setting capacity of competitor A's model Av as 100. Material : Spruce produced in USA. Grit : 120 BO4900 MAKITA BO4900V BO4901 MAKITA 9045N Competitor A Av Competitor B B-1 Competitor C Cv Competitor D D-130

Repair

< 1 > Lubrication Apply a bit of MAKITA grease N. No.2 to the following portions marked with black triangle to protect parts and product from unusual abrasion. See Fig.1.

P 5 / 14

Clamp lever x 2 pcs. ( Knob side and dust bag side)
Paper camp x 2 pcs. ( Knob side and dust bag side)
Fig.1 < 2 > Disassembling base section 1. Separate pad from base by unscrewing 8 pcs. of pan head screws M4 x 12. And disassemble under cover and O ring 75 from base. See Fig. 2.
Frame Frame Base Base Pad Under cover O ring pcs. of pan head screws M4 x 12 Fig.2 2. Lock balancer with screwdriver inserted at the rib of base, and take off hex socket head bolt M5 x 16 with hex wrench, or with impact driver. Then balancer can be separated from base. See Fig. 3. Balancer Hex wrench with which hex socket head bolt M5 x 16 can be unscrewed.

Screwdriver

< Note > The hex socket head bolt M5 x 16 is an adhesive screw. Rib Bottom view of base
3. After taking off balancer, tighten the hex socket head bolt M5x16 again loosely. And slightly hit this hex socket head bolt. Then base can be separated from frame. See Fig. 4. Frame

P 6 / 14

Hex socket head bolt M5x16
Bottom view of base Fig. 4
< 3 > Assembling base section 1. Make sure that 4 pcs. of foot has been assembled to the correct positions, before assembling base. See Fig. 5. 2. Lock balancer with screwdriver inserted at the rib of base, and fasten hex socket head bolt M5 x 16 with hex wrench, or with impact driver. Then balancer can be assembled to base. See Fig. 6. Hex wrench with which hex socket head bolt M5 x 16 can be fastened. Balancer

Base 4 pcs. of foot

Rib Bottom view of base < Note > The hex socket head bolt M5 x 16 is an adhesive screw. Do not fasten the base with the used bolt. Replace with the fresh adhesive hex socket head bolt M5 x 16. Fig. 6

Fig. 5

3. Assemble under cover with aligning its slit with the guide rib of base as illustrated in Fig.7. 4. Assemble O ring 75 by pushing it with screwdriver into the space between under cover and the wall of base. See Fig. 7A. O ring 75

Under cover

Guide rib of base Fig. 7 Fig. 7A Wall of frame Under cover
< 4 > Disassembling ball bearings 6002LLB 1. Disassemble bearing 24 and thin washer 15 by unscrewing 3 pcs.of tapping screws as illustrated in Fig. 8. 3 pcs. of tapping screws CT 4x12

P 7 / 14

Bearing retainer 24 Thin washer 15
Fig. 8 2. Holding the base with 1R165 "Ring Spring Setting Tool", disassemble 2 pcs.of ball bearings 6002LLB by pressing No.1R24 "Round Bar for Arbor" with arbor press as illustrated in Fig. 9. Press with arbor press. No.1R248 Round bar for arbor <Note> Sleeve is disassembled together with 2 pcs. of ball bearings 6002 LLB.
2 pcs.of ball bearings 6002LLB
Sleeve No.1R165 Ring spring setting tool Fig. 9
3. Holding the ball bearings 6002LLB with No.1R232 "Pipe 30", separate sleeve from ball bearings by pressing it with arbor press as illustrated in Fig. 10. Press with arbor press.
No.1R244 Round bar for arbor Ball bearings 6002LLB No.1R232 "Pipe 30 Sleeve

Fig.10

P 8 / 14
< 5 > Assembling ball bearings 6002LLB 1. Holding the ball bearings 6002LLB with No.1R232 "Pipe 30", insert sleeve into ball bearings by pressing it with arbor press as illustrated in Fig. 11. 2. Assemble the ball bearings 6002LLB (with sleeve) to base by pressing with arbor press as illustrated in Fig. 12. 3. Assemble thin washer 15 and bearing retainer 24 by fastening them with 3 pcs. of tapping screws CT 4x12 as illustrated in Fig. 13. 3 pcs. of tapping screws CT 4x12 Press with arbor press. Press with arbor press. No.1R244 Round bar for arbor Sleeve Ball bearings 6002LLB Fig. 13 No.1R248 Round bar for arbor Bearing retainer 24 Thin washer 15
No.1R232 "Pipe 30 Fig. 11

Fig. 12

< 6 > Disassembling armature 1. Disassemble top cover by unscrewing 5 pcs. of tapping screws 4x18. And disassemble carbon brushes as illustrated in Fig. 14. 2. Separate motor housing from frame after unscrewing 4 pcs. of tapping screws bind CT 4x20 as illustrated in Fig. 15. 3. Slightly hit the armature shaft with plastic hammer as illustrated in Fig. 16. Then armature can be separated from frame. 5 pcs. of 4 pcs. of tapping tapping screws 4x18. screws bind CT 4x20

Top cover Carbon brushes Motor housing

Armature Frame

Fig. 14 Frame

Fig.15

Armature shaft Ball bearing 608DDW can be disassembled with No.1R269 " Bearing Extractor small type."
< 7 > Assembling armature Take the reverse steps of Fig.13 - Fig.15.

Fig. 16

Circuit

diagram

P 9 / 14
Color index of lead wires Black White Orange Purple See-through

BO4900V

Note in repairing
Do not directly connect the field lead wire (purple) and controller lead wire (white or blue) to brush holder. Cut the field lead wire (purple) and connect it to controller lead wire (white or blue) with insulated terminal, and connect the insulated terminal to brush holder with the other piece of field lead wire (purple). Field lead wire (purple) to support Other piece of field lead wire (purple) Support Support Brush holder Insulated terminal White or blue Connect to field core. Brush holder Brush holder White or black

Controller

Insulated terminal

Noise suppressor B

Switch Choke coil 4 1
Black or brown They are put in the rear side of switch ( cord guard side), which are not used in some countries.

Noise suppressor A

Power supply cord White or blue Noise suppressor is not used for some countries, or 2 wires type of noise suppressor is used for other some countries.

Wiring

P 10 / 14
Fix lead wires with lead holder. Support lead wire (purple) Controller lead wire (black) Fix lead wires with lead holder. Support lead wire (black) Support lead wire (white or black) Grounding lead wire of noise suppressor (see-through) Pass 2 support lead wires inside of pin. Fix lead wires with lead holder. Do not slack the lead wires between this line.
Support lead wire (orange) Controller lead wire (orange) Fix lead wires with lead holder. Controller Put the insulated terminal in this space. Fix lead wires with lead holder.
Controller lead wire (white or blue) Put slack portion of lead wires into this space. Controller

lead holder

Controller lead wire (white or blue) Before installing controller, fix the lead wire (white or blue) with lead holder as illustrated above. * Insulated terminal * Noise suppressor B

Inflect this switch terminal to set noise suppressor. ** Noise suppressor A **Noise suppressor A is not used for some countries, or 2 wires type of noise suppressor is used for other some countries. * Choke coil Put the following parts in the rear side of switch ( cord guard side). * Noise suppressor B * Choke coil * Insulated terminal They are not used for some countries Fix the lead wires with lead holders.
Refer to "Note in repairing" at page 9.
Insulated terminal Controller lead wire (White or blue)
Field lead wire (purple) Controller lead wire (White or blue)
Lead wire (purple) (other piece of field lead wire)

P 11 / 14

BO4900 (except Taiwan and Great Britain, low voltage area) BO4901

Support

White or black

Connect to field core.

Switch 4 1

Black or brown

Noise suppressor
Power supply cord White or blue

P 12 /14

Fix lead wires with lead holder. Support lead wire (purple) Support lead wire (orange) Fix lead wires with lead holder. Support lead wire (black) Support lead wire (white or black) Grounding lead wire of noise suppressor (see-through) Pass 2 support lead wires inside of pin. Fix lead wires with lead holder. Do not slack the lead wires between this line.
Fix lead wires with lead holder.
Inflect this switch terminal to set noise suppressor. Noise suppressor Noise suppressor is not used for some countries.

P 13 /14

BO4900 (Taiwan and Great Britain, low voltage area)

Brush holder

Support Brush holder Connect to field core.

P 14 / 14

Fix lead wires with lead holder. Support lead wire (purple) Lead wire (orange) Fix lead wires with lead holder.
Support lead wire (black) Support lead wire (white) Grounding lead wire of noise suppressor (see-through) Pass 2 support lead wires inside of pin. Fix lead wires with lead holder.

Do not slack the lead wires between this line.
Fix lead wire with lead holder. Support lead wire (orange)
Choke coil lead wire (orange) Fix lead wires with lead holder.
Inflect this switch terminal to set noise suppressor. Noise suppressor Noise suppressor Choke coil