Makita 8391D, 8381DWPLE, 8381DWPE3, 8381DWPE, 8381DWAE Technical Information

Models No.

Description

PRODUCT

T

ECHNICAL INFORMATION

CONCEPT AND MAIN APPLICATIONS

P 1/ 7

8391D

18V Cordless Hammer Driver Drill
13mm (1/2")

Also, the models include the accessory listed in "Standard equipment".

L1

L2

H

Model 8391D has been developed as the successor model of 8390D,
featuring:
Single sleeve keyless drill chuck for easy bit installation/removal
New tool design

W

Dimensions: mm (")

Width (W)
Height (H)

Length (L1)/ (L2)

97 (3-13/16)

234 (9-1/4) / 241 (9-1/2)

252 (9-7/8)

Specification

Model 8391D is available in the following variations.

L1: for all countries except those described
below in L2
L2: for countries of North America and
Latin America

Battery

Capacity of drill chuck: mm (")

Capacity: mm (")

Lock torque: N.m (in.lbs)

Electric brake

Variable speed control

Mechanical speed control

Reverse switch

Max. fastening
torque: N.m (in.lbs)

Torque setting

Steel

Wood

Soft joint

Hard joint

No load speed:
min-1=rpm

Cell

Voltage: V
Capacity: Ah

High

Net weight [with Battery 1822]: kg (lbs)

Low

Max output: W

Ni-Cd

18

1.3/ 2.0

Yes

Yes

Yes (2 speed)

Yes

2.3 (5.1)

13 (1/2)

36 (1-7/16)

Masonry 13 (1/2)

16 stage + drill mode

Clutch torque setting: N.m (in.lbs) 1.0 - 4.0 (9 - 35)

38 (340)

27 (240)

42 (370)

0 - 1,300

0 - 400

1.5 - 13 (1/16 - 1/2)

230

Impacts per minute:
min-1=ipm

High

Low

0 - 19,500

0 - 6,000

8391DZ No

Model No.

type quantity

Charger

---No

Battery

NoNo

8391DWAE

DC18042 Yes

No

Rechargeable

flashlight

Plastic carrying

case

DC18042

No

Battery

cover

2

2

8391DWPE

PA18

(Ni-Cd 1.3Ah)

Yes

No

8391DWPLE ML180

1822

(Ni-Cd 2.0Ah)

8391DWALE ML180

Standard equipment

Note: The standard equipment for the tool shown above may differ by country.

+- Bit 2-65 (double-end) ........ 1 pc

Optional accessories

Battery 1822
Battery 1834

Battery 1835
Battery 1835F

Battery PA18
Charger DC1804

Automotive charger DC1822
Drill bits for wood

Drill bits for steel
Drill bits for masonry
Driver bitsTCT drill bits

P 2/ 7

R

epair

CAUTION: Remove the battery and the bit from the machine for safety before repair/
maintenance in accordance with the instruction manual!

[1] NECESSARY REPAIRING TOOLS

[2] LUBRICATIONS

[3] DISASSEMBLY/ASSEMBLY
[3]-1. Keyless Drill Chuck

Hex wrench 8 Removing / Installing Drill chuck

Plastic hammer Removing Drill chuck

Description Use for

The components of Gear ass’y has been lubricated in Makita plant and assembled under strict quality control. Therefore,
it is recommended to replace Gear ass’y without disassembling in repair.

Note: When replacing Gear ass’y, begin by removing Keyless drill chuck.
As long as the repairing does not concern Gear ass’y, it is not necessary to remove Keyless drill chuck.

(1) Remove M6x22 Flat head screw. (Fig. 1)
(2) Preset the machine as illustrated in Fig.2.
(3) Hold the machine firmly and pull the switch trigger slowly and carefully.
Note: 1) Pay attention that the machine except Keyless drill chuck starts revolving with strong force. Do not pinch your
hand between the moved machine and Vise in this step.

2) If it is impossible to remove Keyless drill chuck, use 1R359 (Chuck removing tool) to remove it. Refer to Makita
repair tool list.

1) Turn Keyless drill chuck clockwise until it sits on the end of the threaded portion of Spindle.

2) Fix the short portion of Hex wrench 8 to Drill chuck, and clamp the long portion of Hex wrench 8 in Vise.

3) Set Speed change lever in the low speed mode and F/R change lever in the Forward (clockwise) rotation mode. Then
Install Battery.

4) Hold the machine firmly and pull the switch trigger to rotate Spindle until the motor is locked.
Note: Pull the switch trigger so that Spindle reaches full speed in one second.
Important: Be sure to release the switch trigger just after Spindle is locked.

5) Secure Keyless drill chuck with M6x22 Flat head screw by turning counterclockwise with impact driver.
Note: If you reuse the removed M6x22 Flat head screw, apply adhesive (ThreeBond 1321B/ 1342, Loctite 242) to
the threaded portion. Makita genuine M6x22 Flat head screw for securing Keyless drill chuck is threadlocker
screw.

DISASSEMBLING

ASSEMBLING

Hex wrench 8

Note: Hold the flat surface
of Hex wrench 8.

Vise

Clamp the long portion
of Hex wrench 8 in Vise.

Vise

Fig. 1 Fig. 2

M6x22 Flat head screw
with adhesive
Note: Pay attention to the
turning direction.

Open the jaws of Keyless drill chuck fully
and remove M6x22 Flat head screw by
turning clockwise.
If it is difficult to remove the screw with
slotted screwdriver, use cordless impact
driver.

Set F/R Change lever in
the reverse mode.

Set Speed change lever
in the low speed mode.

Set Change ring
in the drill mode.

Hold Hex wrench 8
by tightening the jaws
of Keyless drill chuck.

Install Battery.

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R

epair

[3] DISASSEMBLY/ASSEMBLY
[3]-2. Gear Ass’y, DC Motor

DISASSEMBLING

(1) Remove Keyless drill chuck.
(2) Gear ass’y and DC Motor can be disassembled in the order of Figs. 3, 4, 5, 6 and 7.

3x16 Tapping
screw (9pcs.)

Gear ass’y

Speed change lever ass’y

DC motor

Housing set (R)

Housing set (L)

DC motor

notch of Speed
change lever
ass’y

Remove Speed change
lever ass’y from Gear
ass’y.

Gear ass’y

Remove Gear ass’y, Speed change lever ass’y and
DC motor with Switch from Housing set (L) as
illustrated above.

Disassemble Housing set (R) by unscrewing
3x16 Tapping screws (9 pcs.).

Pull off Gear ass’y while turning
it clockwise viewed from DC
motor side.
Now Gear ass’y can be replaced.

Motor bracket

Motor bracket

Remove DC motor from Motor
bracket by unscrewing M3x6
Pan head screws (2pcs.).
Now DC motor can be replaced.

DC motor

Housing set (L)

protrusion of
Gear ass’y

Fig. 3

Fig. 5 Fig. 6

Fig. 7

Fig. 4

M3x6 Pan head
screw (2pcs.)