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T ECHNICAL INFORMATION
Models No. 6918FD L
PRODUCT
P1/7
Description Cordless Impact Wrench
CONCEPT AND MAIN APPLICATIONS
In addition to all the powerful features of 6918D,
6918FD has a built-in LED job light. H
( Max. fastening torque : 120 N.m and the lightest and compact body 12V
in this class, etc.).
The variations of this model are as listed below.
Model No. Battery Q' ty Charger
W
6918FDWAE 1222 Ni-Cd 2.0Ah 2 pcs.
6918FDWDE 1234 Ni-MH 2.6Ah 2 pcs. DC1414
6918FDWFE 1235 Ni-MH 3.0Ah 2 pcs.
Dimensions : mm ( " )
These 3 models come with battery cover and plastic carrying case in
Length ( L ) 173 (6-13/16)
addition to the above charger and battery.
Width ( W ) 94 (3-11/16)
Height ( H ) 231 (9-1/8)
Specification
Voltage (V) 12
No load speed (min-1=rpm) 0 - 2,300
Impact per minute (min-1=bpm) 0 - 3,000
Square drive : mm ( " ) 12.7 (1/2)
Standard bolt M8 - M14 (5/16 - 9/16)
Capacities
High Tensile bolt M6 - M12 (1/4 - 15/32)
Max. fastening torque : N.m ( in.lbs) 120 ( 1,064 )
Built -in LED Job Light Yes
Electric brake Yes
Variable switch Yes
Reverse switch Yes
Net weight: kg (lbs) 1.6 (3.5)
Standard equipment
* Socket 19 - 38 ....................................... 1 pc.
* Pin 4 ...................................................... 1 pc. Comes without these items for North American countries.
* O ring 24 ............................................... 1 pc.
* Battery cover .......................................... 2 pcs.
* Plastic carrying case ............................. 1 pc.
< Note > The standard equipment for the tool shown may differ from country to country.
Optional accessories
* Various sockets * Charger DC1414
* Battery 1220 * Charger DC1413
* Battery 1222 * Charger DC1470
* Battery 1234 * Charger DC1804
* Battery 1235 * Automotive charger D1422
Features and benefits P2/7
6918FD
Powerful, Max. Torque : 120 N.m Compact size in this class
173mm
Magnesium alloy hammer case (6-13/
16")
Externally accessible
carbon brush
Push button for
reversing
Built-in LED Job Light Soft Grip for comfortable control
for shining your working
point in shadow D28 Type DC motor with
the following features.
Variable speed control switch * Rare earth metal magnet
* Efficient cooling
So long service life to fasten 100,000 * Externally accessible carbon
screws or bolts. brush extends the motor life
In case of the product of the competitor D, 2 times longer than
the following troubles arise with the fastening the competitor's product.
of 10,000 - 40,000 screws or bolts. Furthermore MAKITA's
* Breakage of switch by the vibration replaceable armature makes
* The end of the service life of carbon brush, the tool life even beyond
in other words, the end of the service life the motor life.
of DC motor itself
* The battery falls out of the machine easily,
due to wear on the battery holder.
Comparison of products
Model No. MAKITA Competitor A
Specifications 6918FD 6918D Model B
Voltage : V 12 12 12
Battery
Current capacity : Ah 2.6 2.6 1.7
Energy capacity : Wh 31.2 31.2 20.4
Battery cell Ni-MH Ni-MH Ni-Cd
Charging time : min. Approx. 60 Approx. 60 Approx. 45
Square drive : mm (") 12.7 (1/2) 12.7 (1/2) 12.7 (1/2)
Max. fastening torque : N.m (in.lbs) 120 (1,064) 120 (1,064) 158 (1,400)
No load speed (min-1=rpm) 0 - 2,300 0 - 2,300 0 - 2,400
Impact per minute (min-1=bpm) 0 - 3,000 0 - 3,000 0 - 3,000
Material of hammer case Magnesium alloy Magnesium alloy Magnesium alloy
Built-in LED Job light Yes No No
Externally accessible brush Yes Yes No
Soft grip Yes Yes Yes
Length : mm 173 176 168
(") (6-13/16) (6-15/16) (6-5/8)
Dimensions
Width : mm 94 94 82
(") (3-11/16) (3-11/16) (3-1/4)
Height : mm 231 231 235
(") (9-1/8) (9-1/8) (9-1/4)
Net weight 1.6 (3.5) 1.6 (3.5) 1.7 (3.7)
Battery Yes 2 pcs. Yes 2 psc. Yes 2 pcs.
Standard
Battery cover Yes Yes Yes
equipments
Charger Yes DC1414 Yes DC1413 Yes
Repair P3/7
< 1 > Lubrication
Apply MAKITA grease N. No.2 to the following portions designated by black triangle to protect
parts and product from unusual abrasion.
Hammer case Hammer
Nylon washer 14 (23) (28) (27) (29) (31)
(21)
Fig. 1 (32) (28) (29)
Position Amount : g
No. Parts item Portion to be lubricated (oz)
21 Anvil Cylindrical portion 0.5 (0.02)
23 26 pcs. of Steel ball 3.5 0.5 (0.02) in total
27 Spindle The cylindrical portion where (21) anvil contacts 0.5 (0.02) in total
28 Spur gear 22 Teeth portion 2.0 (0.07)
29 Pin 5 Cylindrical portion 0.5 (0.02)
31 Internal gear 51 The portion where (28) spur gear 22 engages. 0.5 (0.02)
< 2 > Removing housing R and L
Remove hammer case from housing R and L.
And then, housing R and L can be removed.
< 3 > Disassembling hammer and spindle section
(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 2 pcs. of steel ball 5.6 from spindle. See Fig. 5.
(4) Hold the hammer section as illustrated in Fig. 6. And loose the handle of large gear extractor.
< Caution > Do not hold gear extractor as illustrated in Fig. 5, when loosening the handle of gear extractor.
Because, steel balls 3.5 can fall out of hammer unintentionally.
Steel ball 5.6
Spindle
Cam groove top
of spindle
Opening for steel Hammer
ball inserting
Fig. 5
Fig. 6
Repair P4/7
(5) Now hammer section can be disassembled as illustrated in Fig. 7.
(6) After removing flat washer 24, steel balls 3.5 can be taken out from hammer. See Fig. 8.
Spindle section Hammer
Flat washer 24
Pin 5
Cup
washer 14
Compression Steel ball 3.5
spring 25 (24 pcs.)
Spur gear 22
Flat washer 24
Spindle Fig. 8
Hammer
Fig. 7
< 4 > Assembling hammer and spindle section
(1) Put 24 pcs. of steel ball 3.5 into hammer, and cover them with flat washer 24. See Fig. 9.
(2) Mount 2 pcs. of spur gear 22 to spindle and pass 2 pcs. of pin 5 (as a gear shaft) through spindle and spur gears 22.
Mount flat washer 24 to the spindle. Now the spindle section has been completed. See Fig. 10.
Put compression spring 25 and cup washer 14 on the hammer. Mount the spindle section to the hammer
as illustrated in Fig. 10.
Flat washer 24 Spindle section
Steel ball 3.5 Pin 5 Flat washer 24
(24 pcs.)
Cup
washer 14
Spur gear 22
Spindle
Hammer
Fig. 9 Compression spring 25
Hammer
Fig. 10
Repair P5/7
(4) Mount 2 pcs. of steel ball 5.6 to the cam groove top which has been aligned with the opening of hammer, wheel
holding the large gear extractor as illustrated in Fig. 11A.
(3) Press the hammer toward the spur gear 22 side with No.1R045 "Large Gear Extractor" in order to reserve the
opening for mounting steel balls 5.6. See Fig. 11.
Cam groove top Steel ball 5.6
Opening
of hammer
Fig. 11 Fig. 11A
Repair P6/7
< 5 > Assembling the body
(1) Mount a rubber pin 4 to housing R, and another rubber pin 4 to housing L. See Fig. 12A
(2) When securing housing R and L with 8 pcs. of tapping screw bind PT3x16, fasten the screws with the fastening
torque of 1.1 - 1.3N.m (11 - 13 kgf.cm).
(3) When securing hammer case with 4 pcs. of tapping screw 4x25, fasten the screws with the fastening
torque of 1.76 - 2.16N.m (18 - 22 kgf.cm). The 4 pcs. of tapping screw 4x25 have to be fasened diagonally.
See Fig. 12C.
(4) When securing FET and FET spacer with tapping screw ST3x8, fasten the screw with the fastening
torque of 1.1 - 1.5N.m (11 - 15 kgf.cm). See Fig. 12B
Tapping screw
Tapping screw
4x25
4x25
Hammer case
Tapping screw
4x25
Tapping screw Tappin screw
Fig.12C
4x25 bind PT3x16
( 8 pcs.)
Tapping screw
4x25
(4 pcs.) Hammer and spindle
section
Hammer case
Housing R
Housing L
Rubber pin 4, mounted
to housing R
Fig. 12A
Rubber pin 4
Yoke unit
FET spacer
FET
Fig. 12
Tapping screw
ST3x8
Fig. 12B
Circuit diagram P7/7
Color index of lead wires' sheath
Black
Red
Endbell
Heat shrink tube LED circuit
M2
M1
FET
(Field Effect Transistor) Switch
Wiring diagram
Endbell
Internal gear case
Yoke unit
FET
(Field Effect
Transistor)
LED circuit Rib LED circuit
Switch
Push the following lead wires Put the lead wire (black),
connecting endbell and
deep into the lead holders Put the slack portion of the following
switch, under the same
as illustrated above. lead wires in this space.
lead wire (red) and pass
* FET lead wires (black)
* LED lead wire (black) it through the space
* LED lead wire (red)
* LED lead wire (red) between rib and FET.
* LED lead wire (black)