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T ECHNICAL INFORMATION
Model No. 8390D
PRODUCT
P1/7
Description L
Cordless Percussion Driver Drill 13mm
CONCEPT AND MAIN APPLICATIONS
Model 8390D has been developed by adding percussion mechanism
to Model 6390D. H
Its brief features are:
*High torque delivered by powerful Type 775 motor
*Compact design with an overall length of only 239mm (8-5/8")
This new product is available in the following variations.
Battery W
Battery cover
Model No. type quantity (quantity) Charger Flash light Dimensions: mm (")
8390DZ without --- --- without Length (L) 239 (9-3/8)
without
8390DWAE 1822 (Ni-Cd 2.0Ah) 2 2 Width (W) 95 (3-3/4)
8390DWALE 1822 (Ni-Cd 2.0Ah) 2 2 ML180 Height (H) 252 (9-7/8)
8390DWPE PA18 (Ni-Cd 1.3Ah) 2 2 DC1804
without
8390DWPE3 PA18 (Ni-Cd 1.3Ah) 3 3
8390DWPLE PA18 (Ni-Cd 1.3Ah) 2 2 ML180
Note: All of the above models come with the items listed below
in the "Standard equipment" in addition to the items listed above.
Specification
Voltage: V 18
Battery Cell Ni-Cd
Capacity 1.3 Ah (Battery PA18) 2.0 Ah (Battery 1822)
No load speed: (min -1= rpm) Low: 0 - 350, High: 0 - 1,200
Blows per minute: Low 0 - 5,250
(min -1= bpm) High 0 - 18,000
Chuck capacity: mm ( " ) 1.5 (1/16) - 13 (1/2)
Steel 13 (1/2)
Drilling capacity: Wood 36 (1-7/16)
mm (") Masonry 13 (1/2)
Max fastening Soft joint 27
torque: N.m Hard joint 42
Electric brake Yes
Variable speed control Yes
Reverse switch Yes
Net weight*: kg (lbs) 2.3 (5.1)
*includes battery 1822.
Standard equipment
Philips bit 2-65 ............... 1
Plastic carrying case ....... 1
Note: The standard equipment for the tool shown may differ by country.
Optional accessories
Battery 1822 Charger DC1804 Assorted drill bits for wood
Battery 1834 Charger DC1822 Assorted drill bits for steel
Battery 1835 Assorted driver bits
Battery 1835F Assorted TCT drill bits
Battery PA18
P2/7
Features and benefits
239mm
Compact Design (9-3/8") Powerful Type-775 Motor
with an Overall Length Delivers High Torque.
of Only 239mm (9-3/8")
Provides outstanding
maneuverability. *
(About 25mm shorter than 8443D) Rubberized Soft Grip
Provides comfortable operation
13mm (1/2") Chuck with better control.
* *
All Metal Gear Construction Hand strap is attachable.
Ensures extra-high transmission durability.
(Uses the same gear assembly as
6260D/8270D series models.) PA Type battery
is also available.
*Same advantage as Model 8270D
Comparison of products
Specification Comparison
Model No. Makita A
Specifications 8390D A
Voltage: V 18 18
Battery Capacity: (Ah) 1.3 (PA-18)/ 2.0 (1822) **1.4
Cell Ni-Cd Ni-Cd
Charging time: min. 30/ 45 (w/ DC1804) 60
Low 0 - 350 0 - 400
No load speed: min-1=rpm
High 0 - 1,200 0 - 1,400
Low 0 - 5,250 0 - 5,200
Blows per minute: min-1=bpm
High 0 - 18,000 0 - 18,200
Lock torque: N.m (in.lbs) 38 (340) 39 (345)
Hard joint 42
Max. fastening torque: N.m N/A
Soft joint 27
Wood 36 (1-7/16) 32 (1-1/4)
Capacity: mm (") Steel 13 (1/2) 13 (1/2)
Masonry 13 (1/2) 13 (1/2)
Mabuchi Johnson
Motor
RS775-VC HC785
Sleeve type Dual Dual
Keyless chuck
Chuck capacity: mm (") 13 (1/2) 13 (1/2)
16 stages + 22 stages +
Torque adjustment
drill mode drill mode
Metal gear Yes No
Bit holder No Yes
Side handle No No
Soft grip Yes Yes
Length: mm (") 239 (9-3/8) 260 (10-1/4)
Dimensions Width: mm (") 95 (3-3/4) 74 (2-15/16)
Height: mm (") 252 (9-7/8) 255 (9-7/8)
Net weight: kg (lbs) [includes battery] 2.3 (5.1) 2.3 (5.1)
Plastic carrying case Plastic carrying case
Standard equipment
Bit Bit
**the capacity actually measured
P3/7
Comparison of product
Performance Comparison
Note: 1. With 2.0Ah Ni-Cd battery, Makita models were tested.
2. The test results depend to a great extent on the hardness of materials, etc.
3. The numbers in the bar graphs are relative values when the capacity of Model A of the competitor A
is indexed at 100.
MASONRY DRILLING
Test Conditions: Drilled holes in brick to a depth of 40mm with diameter 10.5mm TCT drill bit.
[Work speed] [Work Volume]
(the time required to drill a hole) (on a single full battery charge)
Slow Fast Few Many
Makita 8390D 100 9.5 sec 174 84 holes
Competitor A
100 100
Model A
0 50 100 150 0 50 100 150 200 250
Clutch
The Graduation on Torque Adjusting Ring and Corresponding Fastening Torque
(The Torque When Clutch Is Disengaged)
[ft.lbs] (kg.cm) N.m
[5.1] (70) 7
[4.4] (60) 6
[3.6] (50) 5
Fastening Torque
[3.0] (40) 4
[2.2] (30) 3
[1.5] (20) 2
[0.7] (10) 1
[0] (0) 0
Graduation on the
torque adjusting ring 1 2 4 6 8 10 12 14 16
Machine screw M4 M5 M6
Applicable screw
Soft wood dia. 3.5x22mm
Wood screw
(pine, etc.) dia. 4.1 x 38mm
Hard wood dia. 3.5 x 22mm
(lauan, etc.) dia. 4.1 x 38mm
16 Stage torque settings allow for;
1) Appropriate torque setting in tightening M4 to M6 machine screws
2) Precision matching of surfaces with wood screws regardless of the screw size or the hardness of wood
P4/7
Repair
[1] Removal/Installation of Drill Chuck
When replacing Gear assembly, remove drill chuck beforehand as described below.
(It is not necessary to remove Drill chuck when disassembling Housing only.)
REMOVAL
1) After fully opening Chuck jaws, remove the chuck screw (M6x22 (-) Flat head screw) by turning it clockwise.
If it is difficult to remove, use a Makita Impact wrench.
2) Slide Speed change lever to the position of "Low", and turn Change ring to "Drill mode".
And then secure one end of a hex wrench with Chuck jaws. Hold the machine firmly, and then remove Drill chuck
by hitting the other end of the hex wrench using plastic hammer to turn Drill chuck counterclockwise. (Fig. 1)
INSTALLATION
1) Secure one end of a hex wrench with Chuck jaws, and the other with vise.
Shift Speed change lever to "Low", and set the machine in the mode of drilling in forward rotation. Hold the grip
of the machine firmly so that your hand cannot be pulled away by reaction torque. And then fasten Spindle to Drill
chuck by pulling the trigger of Switch until Spindle is locked. (Fig. 2)
Note: Release the trigger of Switch just after Spindle is locked. Do not keep on pulling the trigger for longer than
one second.
2) Fasten Drill chuck to Spindle with the chuck screw (M6x22 (-) Flat head screw) by turning it counterclockwise.
Fig. 1 Fig. 2
Slide Speed change lever Turn Change ring
to the position of "Low". to "Drill mode". Shift Speed change Turn Change ring
lever to "Low". to "Drill mode".
Hex wrench
2 4
Hex wrench
6 8
Vise
Important:
In order not to break Spindle, be sure to put the three Push in R/F change lever
circled portions of the tool on work bench, and place for forward rotation mode.
Drill chuck outside the workbench.
[2] Removal/Installation of Motor from/on Gear Assembly
REMOVAL
1) Pull Motor out of Gear assembly while turning it in the counterclockwise direction when viewed from the terminal
end of Motor. (Fig. 3)
2) Remove Motor bracket from Motor by removing two Pan head screws. Now Motor can be replaced (Fig. 4)
Fig. 3 Fig. 4
Motor Motor bracket Motor
Pull Motor
while turning
counterclockwise.
Gear assembly Terminals Pan head screw
P5/7
Repair
[2] Removal/Installation of Motor from/on Gear Assembly
INSTALLATION
1) Place Motor bracket as illustrated in Fig. 5, Fig. 5
and fasten it to Motor with two Pan head
screws. Place Motor bracket Speed change lever side
2) Aligning the protrusions on Motor bracket so that its protruding
with the grooves in Gear assembly, side is positioned on Side without protrusion Red marking
assemble Motor to Gear assembly. (Fig. 6) the opposite side to the
3) Assemble Motor to Gear assembly while red marking on Motor.
turning it in the clockwise direction when
viewed from the terminal end of Motor.
(Fig. 7)
Pan head screw
Motor
Motor bracket Protruding side
Trigger switch side
Fig. 6 Fig. 7
Grooves in Gear assembly
Protrusions on
Motor bracket
Terminals
Gear assembly Gear assembly Motor
Motor bracket
Motor
[3] Installing Speed change Lever
Fig. 8
1) Make sure that two Compression springs are set in place on Speed change lever
as illustrated in Fig. 8. Compression springs
2) Install Speed change lever onto the protrusion on Gear assembly as illustrated
in Fig. 9.
After installation, slide Speed change lever to either side. (Fig. 10)
Speed change lever
Fig. 9 Fig. 10
Speed change lever
Speed change
lever
Compression
springs
Protrusion
Protrusion
Gear assembly Motor
P6/7
Repair
[5] Installing Leaf spring Onto Housing (L)
Before installation of inner electrical parts, Fig. 11
remember to set Leaf spring in place on
housing (L) as illustrated in Fig. 11. Housing (L)
Leaf spring
[6] Installing Change Ring on Gear Assembly
Install Change ring on Gear assembly as illustrated in Fig. 12.
Fig. 12
ribless portion
Rib
the widest protrusion
Change ring
Gear assembly
Aligning the ribless portion on Change ring
with the widest protrusion on Gear assembly,
install Change ring on Gear assembly.
[7] Installing F/R Change Lever
Install F/R change lever onto Trigger switch Fig. 13
by placing the boss on Trigger switch between
the prongs on F/R change lever as illustrated F / R Change lever
in Fig. 13. prongs
prongs boss
boss
Trigger switch
P7/7
Circuit diagram
Color index of lead wires' sheath
Black
Red
Red marking
Battery holder Switch D/C motor
Wiring diagram
[1] Connecting Lead Wires with Motor Fig. 14
Connect the lead wires with the terminals on Motor so that they Red marking
are placed on the side of Housing (L). (Fig. 14)
[2] Wiring in Housing
Route lead wires as illustrated in Fig. 15.
[3] Connecting Lead Wires with Battery Holder
Lead wire (red)
Connect lead wires with the terminals on Battery holder as
illustrated in Fig. 16. Lead wire (black)
Fig. 15
Do not put lead wires on
this rib.
Gear assembly D/C Motor
Hold the lead wires with
lead wire holder.
Switch Lead wire (black)
Route the lead
wire (red) through Lead wire (red)
the boss and the rib.
Battery holder
Route the lead
wire (black) through Fig. 16
the boss and the rib.
Lead wire (black)
Lead wire (red)