Makita BLS820SF Manual

Voltage (V)
Models No.
Description
NEW TOOL
TECHNICAL INFORMATION
CONCEPTION AND MAIN APPLICATIONS
Specification
Standard equipment
Optional accessories
< Note > The standard equipment for the tool shown may be differ from country to country.
BLS820SF
Cordless miter saw 216mm (8-1/2")
L
W
H
Dimensions : mm ( " )
Length (L)
Width (W)
Height (H)
430 (17)
528 (20-3/4)
486 (19-1/8)
Battery
Energy (Wh)
Capacity (Ah)
No load speed : (min -1= rpm)
Applicable
Blade
Diameter : mm ( " )
Hole diameter : mm ( " )
Net weight : Kg (lbs)
Max. cutting capacity : Height x Width / mm ( " )
Miter
angle
Bevel angle
45 °
0 °
0 ° 45
°(left)
61 x 122
(2-3/8 x 4-13/16)
61 x 85
(2-3/8 x 3-3/8)
45 x 122
(1-3/4 x 4-13/16)
45 x 85
(1-3/4 x 3-3/8)
24
3.0
72.0
2,300
210 (8-1/4) - 216 (8-1/2)
15.88 (5/8) for Canada, USA. Mexico
30.0 (1-3/16 ) for European countries
25.4 (1)for Other countries
10.1 (22.3)
* Charger DC24SA ..................................................... 1 pc.
* Vise assembly (excluding Canada, USA. Mexico).... 1 pc.
* Dust bag .................................................................. 1 pc.
* Holder set (excluding Canada, USA. Mexico).......... 1 pc.
* TCT.saw blade 216 w/ 40T ....................................... 1 pc.
* Battery B2430 ( 24 V, 3.0Ah) .... 1 pc.
* Box wrench 10 ......................... 1 pc.
* Triangular rule ........................... 1 pc.
* Lock off button ( for spare ) ....... 2 pcs.
* Sub plate .................................... 1 pc.
Battery B2417 24V / 1.7Ah
Battery B2430 24V / 3.0Ah
Charger DC24SA
Various chip saw blade
Holder assembly
Set plate
Vise assembly (horizontal)
BLS820SF is included in Makita's new line-up of
24V cordless tools powered by our brand-new, 24V
Nickel-Metal Hydride battery.
Taking over the benefits of our existing Model LS800D,
yet, this machine is more powerful thanks to the new 24V battery.
Ideal for a wide range of interior works.
This model comes with charger DC24SA and
battery B2430 ( 24 V, 3.0Ah).
P 1 / 9

Repair
< 1 > Lubrication
Apply MAKITA grease N.No.1 to the following parts.
* Blade case and arm section
40
Blade case
Arm
Sub arm
Rod 16-100
Grease
Grease
Grease Grease
* Turn base section
Base complete
Grip 32
Lock lever
Slide plate
Turn base
Grease
Grease
Grease
Grease
* Safety cover section
Safety cover
Spiral spring 26
Link plate
Center plate
Grease
P 2 / 9

Repair P 3 / 9
<2> Removing and assembling blade case section
[1] Removing
Lock handle in the raised position by pushing in
stopper pin as illustrated in Fig.1. Stopper pin
Fig.1
[2] Loosen the hex bolt holding center cover with
socket wrench (standard equipment) by turning it
counterclockwise as illustrated in Fig.2.
Fig.2
[3] Raise center cover and safety cover. Press shaft lock
to lock spindle. And then, remove hex flange head bolt
holding the saw blade with socket wrench by turning it
clockwise as illustrated in Fig.3.
Shaft lock Safety cover
Center cover
Fig.3
[4] Remove safety cover section by loosening flat head screw M5
as illustrated in Fig.3, and dust nozzle from the machine.
Flat head screw M5
[5] Loosen hex socket head bolt M6x20 holding link plate
and hex socket head bolt M6x10 holding rod 16-100
as illustrated in Fig.4.
[6] Pull stopper pin while holding motor unit (motor housing, blade case
and handle set), and raise motor unit till it comes to out of effect
of torsion spring. And then, remove motor unit after taking off
rod 16-100.
Right side view
Link plate
Hex socket
head bolt M6x20
Lever
Arm Front side view of
arm section
Stopper pin
Hex socket
head bolt M6x10
Arm
Lever
Stopper pin
Rod 16-100
Motor unit
Motor unit
Motor unit
Torsion spring
Fig.4
Fig.5

Repair P 4 / 9
<3> Assembling safety cover unit
[1] Insert the end of spiral spring 26 into the long hole of safety cover as illustrated in Fig.6.
[2] Assemble center washer adjusting its holes to the 4 bosses of safety cover after hitching
it with the another end of spiral spring 26, and assemble center cover as illustrated in Fig.7.
[3] Assemble center plate adjusting its 4 holes to 4 bosses of safety cover. Fasten safety cover
unit ( flat washer 5, safety cover, spiral spring 26, center washer, center cover and center
plate) with pan head screw M5x20 as illustrated in Fig.8.
Spiral spring 26
Safety cover
Fig.6
Spiral spring 26
Center washer
Safety cover
Center cover
Fig.8
Spiral spring 26 Center washer
Safety cover
Fig.7
Center cover
Center plate
Flat washer 5
Pan head screw M5x20 View from back side of safety cover
Small hole
of center cover

Repair P 5 / 9
<4> Adjusting hex nut M8 and hex bolt M8 x 55
Hex nut M8x13 has to be so adjusted and fastened that the base can be operated smoothly
without trembling.
Flat washer 8
Hex nut M8x13
Turn base
Base complete
Hex bolt M8x55
<5> Assembling the parts for positive stop system in turn base. See Fig.10.
When lock pin is located in the groove of base complete, the lock pin has to protrude from
support plate by 2 - 3mm as illustrated in Fig.10A. This adjustment can be made by sliding
support plate within its elliptic hole.
Fig.9
Grip 32
Lock lever
Compression
spring 7
Lock pin
Pin 3
Support plate
Lock plate
Tapping screw
bind M4x12
Sliding area for adjustment Support plate
2 - 3mm
Lock pin Support plate
Lock lever
Base
Tapping screw
bind M4x12
Fig.10A
Fig.10

Repair P 6 / 9
<6> Assembling arm section. See Fig.11.
67
68
69 707273 71
79
80
81
82
83
84 85
Turn base
86
67 Pan head screw M4x12
68 Lever 100
69 Hex nut M10-17
70 Compression spring 5
71 Flat washer 10
72 Flat washer 10
73 Hex lock nut M10-17
79 Arm complete
80 Screw M10
81 Pin 5
82 Hex socket head bolt M10x35
83 Spring washer 10
84 Indication plate
85 Pan head screw M4x12
86 Sub arm
Fig.11
* Adjust with 73: hex lock nut M10-17 so that 79: arm
complete can be operated smoothly without trembling.
* 68 lever 100 has to be assembled as illustrated in Fig.11A.
Fig.11A
Approx.
45 °
<7> Adjusting torsion spring 28
Adjust spring power with hex socket head bolt M6x10 so that the motor unit can return to
the top lock point (rest position) from every working position smoothly. See Fig.12.
Lever 100
Hex socket
head bolt M6x10
Torsion
spring 28
Fig.12

Repair P 7 / 9
<8> Assembling yoke unit
* Assemble yoke unit to motor housing with adjusting its cut part to the rib on the bottom
of motor housing.
* Be careful, not to pinch your finger when assembling armature to motor housing,
because armature is pull strong into motor housing by the magnet power of yoke unit.
Yoke unit
Motor housing
Armature
Adjust this cut to
the rib on the bottom of
motor housing.
<9> Adjusting the saw blade's angle
* Adjust the saw blade to right angle to turn base and guide fence with the repairing tool
No.1R208 as illustrated in Fig.13.
Fig.14
Fig.12
* Adjust the saw blade to 45 ° to turn base with the repairing tool No.1R207 as illustrated
in Fig.14.
No.1R208 : 90 Degrees set square
25mm 75mm
20mm
70mm
Fig.13
No.1R207 : 45 Degrees set square
60mm
75mm
25mm
20mm

Repair P 8 / 9
* Cutting depth has to be so adjusted that the circumference of saw blade 216mm in dia. comes
to the slit of kerf board when the saw unit is on the lowest position. The adjustment can be
made with hex bolt M6x16.
Hex bolt M6 x 16
for depth adjustment
Circuit diagram
1
2
3
Switch
Brush Holder
Brush Holder
+ Terminal+ Terminal
-Terminal
White
Black
Red
Black
Black
Wiring diagram
Fix lead wire with lead holder as illustrated in Fig.16.
Fig.15
Fig.16
Lead holder
Motor housing (View from armature commutator side)

P 9 / 9
Rib A
Rib B
Pass lead wires between rib A and B as
illustrated in Fig.17.
Fig.17
Motor hosing (View from armature fan side)
Yoke unit
Wiring diagram
Fig.18
Pass lead wires in handle L as illustrated in Fig.18.
Set insulated terminal as illustrated in Fig.18.
Insulated terminal
Fix lead wires with lead holder.
Fix lead wires with lead holder.
Motor housing and handle L