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T ECHNICAL INFORMATION
Models No. 6991D, 6992D
PRODUCT
P1/5
L
Description 9.6V Cordless Impact Wrench
CONCEPTION AND MAIN APPLICATIONS
These models are 9.6V cordless impact wrenches with more compact
and light weight body comparing with Mod.6909D, H
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.
Battery
Model No. No. Type Ah Q'ty Charger
W
6991, 6992DWA 9122 2.0 1 pc.
Ni-Cd
6991, 6992DWAE 9122 2.0 2 pc. Dimensions : mm ( " )
6991, 6992DWD 9134 2.6 1 pc. DC1411 Model No. 6991D 6992D
6991, 6992DWDE 9134 Ni-MH 2.6 2 pc. Width ( W ) 77 (3) 77 (3)
6991, 6992DWF 9135 3.0 1 pc. Height ( H ) 231 (9-1/8) 231 (9-1/8)
6991, 6992DWFE 9135 3.0 2 pc. Length ( L ) 168 (6-5/8) 176 (6-15/16)
Specification
Model No. 6991D 6992D
Voltage (V) D/C 9.6 V
No load speed (min-1=rpm) 0 - 2,300
Impact per minute (min-1=bpm) 0 - 3,000
100N.m (1,020Kgf.cm, 880in.lbs)
Max.fastening torque
(when fastening high tensile bolt M12 for 3 sec.)
Driving shank : mm ( " ) 9.5 ( 3/8 ) Square 12.7 ( 1/2 ) Square
M8 - M14 (5/16" - 9/16")
Capacities Standard bolt
High tensile bolt M6 - M10 (1/4" - 3/8")
Net weight: kg (lbs) 1.3 (2.9 lbs) 1.4 (3.1 lbs)
Standard equipment
* 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.
< Note > The standard equipment for the tool shown may differ from country to country.
Optional accessories
* Various socket ( only 12.7 mm square drive) * Charger DC1411
* Set plate for battery without push button * Charger DC1801
* Battery 9133 * Automotive charger DC1422
* Battery 9134
* Battery 9135
* Battery 9100
* Battery 9102
* Battery 9102A
* Battery 9120
* Battery 9122
Features and benefits P2/5
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)
More compactly designed body
Refer to the comparisons listed
below.
Newly designed D28 type motor
9.5mm square drive with the following features
for Mod. 6991D * more compact and light weight
* Externally accessible brush
* Replaceable armature
12.7mm square drive * Effective cooling
for Mod. 6992D
Magnesium alloyed Push Button for Reversing
hammer case.
Easily operateable variable Palm-fitly, Soft Grip
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.
Comparison of products
9.5mm (3/8") square drive type models
Manufacturer MAKITA
Specification Model No. 6991D 6909D 6907D
Square drive : mm ( " ) 9.5 (3/8) 9.5 (3/8) 9.5 (3/8)
No load speed : (min -1= rpm) 0 - 2,300 0 - 2,200 0 - 2,000
Blows per min : (min -1= bpm). 0 - 3,000 0 - 2,800 0 - 2,600
Equipped motor D28-15 D31- 16 RS750
Max. fastening torque (N.m) 100 88 69
Externally accessible brush Yes Yes No
Overall length : mm 168 (6-5/8) 170 (6-11/16) 185 (7-9/32)
Net weight :Kg (lbs ) 1.3 (2.9) 1.4 (3.1) 1.3 (2.9)
12.7mm (1/2") square drive type models
Manufacturer MAKITA Competitor A
Specification Model No. 6992D Model A-1
Square drive : mm ( " ) 12.7 (1/2) 12.7 (1/2)
No load speed : (min -1= rpm) 0 - 2,300 0 - 2,200
Blows per min : (min -1= bpm). 0 - 3,000 0 - 2,900
Equipped motor D28-15
Max. fastening torque (N.m) 100 98
Externally accessible brush Yes Yes
Overall length : mm ( " ) 176 (6-59/64) 181 (7-1/8)
Net weight :Kg (lbs ) 1.4 (3.1) 1.6 (3.6)
Repair P3/5
< 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.
Spindle
(3)Take off steel ball 5.6 from spindle. Cam groove top
< Note > 25 steel balls 3.5 are installed in hammer. of spindle
Check the quantity when assembling.
Steel ball 5.6 x 2
1R045 Large gear extractor
Hammer
Opening for steel
ball inserting
Steel ball 3.5 x 25
L
(4) Spur gear 22
L= 85mm
L=105mm
L=130mm
W
W: The maximum opening width
is 170mm.
Fig. 1
(4) Apply MAKITA grease N No.2 to the position No. 1, 2,
3 and 4, when assembling. (1) Spindle
(1) Spindle : 0.5g (3) Opening for
(2) Hammer : 0.5g steel ball inserting
(2) Hammer
(3) Opening for Steel ball 3.5 x 25
steel ball inserting : 0.5g
(4) Spur gear 22 : 2.0g
(4) Spur gear 22
Fig. 2
Repair P4/5
< 3 > Removing ball bearing 6901LLB
Internal gear case
Ball bearing 6901LLB
Give a shock by knocking internal gear case Ball bearing 6901LLB can be removed
on the working table. from internal gear case by the shock.
Fig. 3
< 4 > Fastening torque for tapping screws
Tapping screws Fastened position Fastening torque: N.m (Kgf.cm)
4 x 18 Housing set (R & L) 1.27 - 1.76 (13 - 18)
4 x 25 *Hammer case 1.76 - 2.16 (18 - 22)
3x8 FET Spacer 1.1 - 1.5 (11 - 15)
< Note > Hammer case has to be fastened diagonally as illustrated in Fig. 4, when assembling.
Hammer case
Fig. 4
Circuit diagram
FET
(Field Effect Transistor)
Red
Brush holder
M2 M1
Black
Switch
Wiring diagram P5/5
Pass the lead wires as illustrated in Fig.5.
FET
(Field Effect Transistor)
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
Rib
FET lead wires
Fig.5