Makita 6991D Manual

Models No.
Description
PRODUCT
TECHNICAL INFORMATION
CONCEPTION AND MAIN APPLICATIONS
Specification
Standard equipment
Optional accessories
< Note > The standard equipment for the tool shown may differ from country to country.
P 1 / 5
6991D, 6992D
9.6V Cordless Impact Wrench
These models are 9.6V cordless impact wrenches with more compact
and light weight body comparing with Mod.6909D,
but their fastening torques are more powerful than the existing.
Model 6991D is 9.5mm (3/8") square drive type and
Model 6992D is 12.7mm (1/2") square drive type.
The variations of these models are as listed below.
Model No. No.
Battery
Ah
Type Charger Q'ty
6991, 6992DWA
6991, 6992DWAE
1 pc.
1 pc.
1 pc.
DC1411
2 pc.
6991, 6992DWD
6991, 6992DWDE
6991, 6992DWF
6991, 6992DWFE
2 pc.
2 pc.
9122 2.0
9122
9134
9134
9135
9135
2.0
2.6
2.6
Ni-Cd
Ni-MH 3.0
3.0
No load speed (min-1=rpm)
Voltage (V)
Model No.
Capacities
Impact per minute (min-1=bpm)
Max.fastening torque
Net weight: kg (lbs)
D/C 9.6 V
Standard bolt
High tensile bolt
100N.m (1,020Kgf.cm, 880in.lbs)
(when fastening high tensile bolt M12 for 3 sec.)
Driving shank : mm ( " ) 9.5 ( 3/8 ) Square 12.7 ( 1/2 ) Square
1.4 (3.1 lbs)
M8 - M14 (5/16" - 9/16")
M6 - M10 (1/4" - 3/8")
0 - 2,300
0 - 3,000
6991D 6992D
1.3 (2.9 lbs)
* Battery Cover ...................................................... 1 pc.
* Socket 19 - 38 with 12.7mm square drive ........... 1 pc. for Model 6992D (except North American market)
* O ring 24 .............................................................. 1 pc. for Model 6992D (except North American market)
* Plastic carrying case ............................................. 1 pc.
* Various socket ( only 12.7 mm square drive)
* Set plate for battery without push button
* Battery 9133
* Battery 9134
* Battery 9135
* Battery 9100
* Battery 9102
* Battery 9102A
* Battery 9120
* Battery 9122
* Charger DC1411
* Charger DC1801
* Automotive charger DC1422
Dimensions : mm ( " )
Width ( W )
Model No.
Height ( H )
Length ( L )
77 (3)
231 (9-1/8)
77 (3)
231 (9-1/8)
168 (6-5/8) 176 (6-15/16)
6991D 6992D
L
H
W

Comparison of products
Features and benefits P 2 / 5
Model 6991D : 9.5mm (3/8") square drive type
Model 6992D : 12.7mm (1/2") square drive type
The lightest weight in each class
Model 6991D : 1.3 Kg (including any of battery 9122, 9134 or 9135)
Model 6992D : 1.4 Kg (including any of battery 9122 or 9135)
9.5mm square drive
for Mod. 6991D
12.7mm square drive
for Mod. 6992D
Magnesium alloyed
hammer case.
Easily operateable variable
speed control switch
Set plate (optional accessory)
can be attached
for the battery without
push button. High capacity battery 9135 with 3.0Ah
can be used.
Palm-fitly, Soft Grip
Newly designed D28 type motor
with the following features
* more compact and light weight
* Externally accessible brush
* Replaceable armature
* Effective cooling
Push Button for Reversing
More compactly designed body
Refer to the comparisons listed
below.
Model No.
Specification
Square drive : mm ( " )
Manufacturer
No load speed : (min -1= rpm)
Blows per min : (min -1= bpm).
Equipped motor
Max. fastening torque (N.m)
Externally accessible brush
Overall length : mm
Net weight :Kg (lbs )
MAKITA
6991D 6909D 6907D
0 - 2,300 0 - 2,200 0 - 2,000
0 - 3,000 0 - 2,800 0 - 2,600
D28-15 D31- 16 RS750
100 88 69
Yes Yes No
168 (6-5/8) 170 (6-11/16) 185 (7-9/32)
1.3 (2.9) 1.4 (3.1) 1.3 (2.9)
9.5mm (3/8") square drive type models
9.5 (3/8) 9.5 (3/8) 9.5 (3/8)
Model No.
Specification
Square drive : mm ( " )
Manufacturer
No load speed : (min -1= rpm)
Blows per min : (min -1= bpm).
Equipped motor
Max. fastening torque (N.m)
Externally accessible brush
Overall length : mm ( " )
Net weight :Kg (lbs )
MAKITA
6992D Model A-1
0 - 2,300 0 - 2,200
0 - 3,000 0 - 2,900
D28-15
100 98
Yes Yes
176 (6-59/64) 181 (7-1/8)
1.4 (3.1) 1.6 (3.6)
12.7mm (1/2") square drive type models
12.7 (1/2) 12.7 (1/2)
Competitor A

Repair P 3 / 5
< 1 > Removing housing R and L
Remove hammer case from housing R and L.
And then, housing R and L can be removed.
< 2 > Removing hammer
(1) Press down hammer with 1R045: Large gear extractor
by turning the handle.
(2)Adjust the opening for steel ball inserting to the cam groove top of spindle.
(3)Take off steel ball 5.6 from spindle.
< Note > 25 steel balls 3.5 are installed in hammer.
Check the quantity when assembling.
Fig. 1
Spindle
Cam groove top
of spindle
Opening for steel
ball inserting
Steel ball 5.6 x 2
Steel ball 3.5 x 25
Hammer
1R045 Large gear extractor
L
L= 85mm
L=105mm
L=130mm
W: The maximum opening width
is 170mm.
W
(4) Spur gear 22
(4) Apply MAKITA grease N No.2 to the position No. 1, 2,
3 and 4, when assembling. (1) Spindle
(3) Opening for
steel ball inserting
Steel ball 3.5 x 25 (2) Hammer
(4) Spur gear 22
Fig. 2
(1) Spindle : 0.5g
(2) Hammer : 0.5g
(3) Opening for
steel ball inserting : 0.5g
(4) Spur gear 22 : 2.0g

Repair P 4 / 5
< 3 > Removing ball bearing 6901LLB
< 4 > Fastening torque for tapping screws
Give a shock by knocking internal gear case
on the working table.
Ball bearing 6901LLB can be removed
from internal gear case by the shock.
Ball bearing 6901LLB
Internal gear case
Fig. 3
Circuit diagram
Switch
M2 M1
FET
(Field Effect Transistor)
Black
Red
Brush holder
Fastened position
Tapping screws Fastening torque: N.m (Kgf.cm)
Housing set (R & L)
4 x 18
4 x 25
3 x 8
*Hammer case
FET Spacer
1.27 - 1.76 (13 - 18)
1.76 - 2.16 (18 - 22)
1.1 - 1.5 (11 - 15)
< Note > Hammer case has to be fastened diagonally as illustrated in Fig. 4, when assembling.
Fig. 4
Hammer case

Wiring diagram P 5 / 5
Pass the lead wires as illustrated in Fig.5.
FET
(Field Effect Transistor)
FET lead wires Rib
Lead wire (Black) to be
connected to switch has to be passed
under the lead wire (Red).
Lead wire (Red) to be
connected to switch
Fig.5