Makita N5900B Manual

Models No.
Description
PRODUCT
TECHNICAL INFORMATION
CONCEPT AND MAIN APPLICATIONS
Specification
Standard equipment
Optional accessories
< Note > The standard equipment for the tool shown may differ from country to country.
P 1 / 9
Dimensions : mm ( " )
N5900B
The above product has been developed as a less expensive
version of the existing model 5900B, with taking over the
same feature and benefit.
This product is equipped with steel made safety cover.
Circular Saw 235mm (9-1/4")
Width ( W-1 )
Width ( W-2 )
Height ( H-1 )
Height ( H-2 )
Length ( L ) 380 (15)
255 (10)
165 (6-1/2)
287 (11-1/4)
192 (7-9/16)
L
H-1
H-2
W-1
W-2
Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Max. Output(W)
120
110 950
950
1,650
1,650 2,300 2,300
2,600
2,600
2,600
4,100
235 (9-1/4)
Double insulation
25 (1)
85 (3-3/8)
60 (2-3/8)
53 (2-1/16)
7.0 (15.4)
2.5 (8.2) 2.0 (6.6) for Australia
2,000
2,000
2,000
1,300
1,300
1,300
220
230
240
15.0
15.0
9.6
9.2
8.8
Current (A)
50 / 60
50 / 60
50 / 60
50 / 60
50 / 60
No load speed : rpm.= min.-1
Size of blade
Max.cutting
capacities
: mm (")
Net weight : Kg (lbs.)
Cord length : m (ft)
Diameter : mm (")
Arbor : mm (")
at 90 °
at 45 °
at 50 °
Protection against electric shock
Electric brake
* T.C.T. saw blade 235mm 20T .......................... 1 pc.
* Guide rule ......................................................... 1 pc.
* Wrench 13 ....................................................... 1 pc.
No
* Various saw blade
* Joint for connecting with vacuum cleaner

Repair P 2 / 9
< 1 > Lubrication
Apply MAKITA grease N. No.1 to the following portions designated by black triangle to protect
parts and product from unusual abrasion.
Position
No. Parts item Amount : g
(oz)
Portion to be lubricated
20
20 Blade case
Bearing box
Gear room where helical gear 39 rotates.
Cylindrical portion where safety cover moves.
Safety cover
Gear section
8
820 (0.71)
0.5 (0.02)
Fig. 1
< 2 > Disassembling gear section
First of all, detach the saw blade for your safety repair.
( 1 ) Remove retaining ring S-45. See Fig. 2.
( 2 ) Remove safety cover, and disconnect tension spring 5 from blade case. See Fig.3.
( 3 ) Remove gear section by unscrewing 2 pcs. of counter sunk head screw M6x20. See Fig. 4.
Fig. 2 Fig. 3
Fig. 4
Tension
spring 5
Safety cover
Retaining
ring S-45
Gear section
Counter sunk
head screw M6x20

Repair P 3 / 9
60mm
Turn base of
arbor press
1R286 Round
bar for arbor
Spindle
Spindle
Helical gear 39
Helical gear 39
Helical gear 39
Ball bearing 6000DDW
Ball bearing
6000DDW
( 4 ) Put the removed gear section on the turn base of arbor press. And put No.1R286 "Round bar for arbor" on
the spindle. See Fig. 5. And press the round bar for arbor with arbor press. See Fig. 6.
( 5 ) The helical gear 39 and ball bearing 6000DDW can be removed from spindle in the order of Fig. 7, 8 and 9.
Fig. 5 Fig. 6
Fig. 7
Fig. 8
Fig. 9
Spindle
Plate for
bearing extracting
Pipe ring
Fig. 15
No.1R316
Adjustable Bearing
Retainer Wrench
Bearing box
Bearing retainer
Engage these pins with the groove
of bearing retainer for removing or
mounting.
Spindle
Round bar
for arbor
Ring 22

Repair P 4 / 9
Bearing
retainer 23-36
Bearing box
Bearing box
No.1R316
Adjustable bearing
retainer wrench
( 6 ) Remove bearing retainer 23-36 with No. 1R316 "Adjustable bearing retainer wrench". See Fig. 10.
( 1 ) Mount ball bearing 6202DDW in bearing box. See Fig. 12
( 2 ) Mount bearing retainer 23-36 by turning it with adjustable bearing retainer wrench clockwise. See Fig. 13.
( 7 ) Remove ball bearing 6202DDW from bearing retrainer 23-36 by pressing it as illustrated in Fig. 11.
< 3 > Assembling gear section
Fig. 11
Fig. 12 Fig. 13
Fig. 10
For removing bearing retainer 23-36,
turn the Adjustable bearing retainer wrench
counter clockwise.
60mm
Ball bearing 6202DDW
No.1R316
Adjustable bearing
retainer wrench
Bearing retainer
23-36
Ball bearing
6202DD
Bearing
retainer 23-36

60mm
Repair P 5 / 9
( 3 ) Mount spindle by pressing with arbor press. See Fig. 14.
( 4 ) Mount helical gear 39 by pressing with arbor press. See Fig. 15.
( 5 ) Mount ball bearing 6000DDW. See Fig. 16. The gear section has been completed in this step.
( 6 ) Mount the gear section to blade case. See Fig. 17.
Fig. 14 Fig. 15
Fig. 16 Fig. 17
Spindle
Round bar
for arbor
Helical gear 39
Ball bearing
6000DDW
Gear section
Counter sunk
head screw M6x20

Repair P 6 / 9
( 7 ) Mount safety cover. Connect tension spring 5 with blade case and safety cover. Secure safety cover with
retaining ring S-45. See Fig. 18.
( 1 ) Unscrew 5 pcs. of tapping screw 4x18. Remove handle cover from motor housing. Now the electrical parts can
be replaced. See Fig. 19. When mounting the electrical parts, put them as illustrated in Fig. 20.
Fig. 18
Fig. 18R
Fig. 18F
Tension
spring 5
Tension
spring 5
Safety cover
Safety cover
Retaining
ring S-45
Blade case
Hitch blade case with the hook
of taper formed side.
Hitch safety cover with the hook
as illustrated in Fig. 18R.
Tension
spring 5
Safety cover
< 4 > Replacing electrical parts in handle
Fig. 19
Tapping
screw 4x18
(5 pcs.)
Handle
cover
Lock ON button
Switch
(Lock OFF button)
Compression spring 5

Repair P 7 / 9
( 1 ) Separate blade case section, after removing brush holder cap and carbon brush.
And remove handle cover. See Fig. 20.
The distance between blade case and handle is too small to approach strain relief with screwdriver.
Power supply cord can be replaced as illustrated below.
However, if the screwdriver as illustrated in Fig. A, is used, the power supply cord can be removed
without separating the blade case section.
( 2 ) Remove strain relief by unscrewing 2 pcs. of tapping screw 4x18. See Fig. 21.
( 3 ) Remove power supply cord. See Fig. 22.
Lock ON button
Switch
Strain
relief
Tapping screw 4x18
(2 pcs.)
(Lock OFF button)
< 5 > Replacing power supply cord
Fig. 20
Fig. 21 Fig. 22
Pan head
screw M5x50 (4 pcs.) Tapping
screw 4x18
(5 pcs.)
Carbon brush Handle cover
Power supply
cord
Cord guard
smaller than 50mm
Fig. A

Repair P 8 / 9
< 6 > Separating base from motor section
( 2 ) Take off ring spring 12 from lever 54. Remove lever 54 together with hex nut M8 from cap square neck
bolt M8x90. See Fig. 23 and Fig. 24.
( 1 ) Remove safety cover as illustrated in Fig. 2 and Fig. 3 in page 2/9 before the step in Fig. 23.
( 3 ) Take off cap square neck bolt M8x90 from blade case. The rear side of motor section has been disconnected
from base in this step. See Fig. 24.
( 4 ) Unscrew hex nut M6-10 and remove
pan head screw M6. See Fig. 25.
The motor section has been disconnected
from base completely. See Fig. 26.
Fig. 24
Fig. 23
Fig. 26Fig. 25 Hex nut M6-10
Pan head screw M6
< Note >
Be careful, not to lose flat washer 8 which is
mounted between pipe 9 and depth guide of
base, when removing cap square neck bolt M8x90.
Pipe 9
Base
Ring spring 12
Lever 54
Lever 54Hex nut M8 Cap square
neck bolt M8x90
Flat washer 8

Lead wire from field has to be
passed without slacking
in this area.
Lead wire from field has to be
held with lead holder
Circuit diagram
Wiring diagram
P 9 / 9
Color index of lead wires' sheath
Black
524 3
Switch
Noise suppressor
Power supply cord
Field
(Noise suppressor is not used in some countries.)
Field
Switch * Noise suppressor
* Noise suppressor is not used
in some countries.