Makita BFT121F Manual

BFT121F

Cordless Screwdriver 12V

Models No.

Description

PRODUCT

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 / 12

TECHNICAL INFORMATION

Dimensions : mm ( " )

Width ( W )

Height ( H )

Length ( L ) 174 (6-7/8)

288 (11-11/32) 265 (10-7/16)

71 (2-13/16)

w/ 3.3 Ah battery w/ 2.0 Ah battery

No load speed : min-1 = rpm

Driving shank : mm ( " )

Fastening torque : N.m (in.lbs)

Battery

Electric brake

Torque adjustment

LED Job light

Soft starter

Reverse switch

Net Weight : Kg (lbs)

Type of cell

Voltage : V

Capacity : Ah

NiMH

12.0

5 - 12 (44.3 - 106)

6.35 (1/4) Hex

1.5 (3.3) with 2.0 Ah battery

1.7 (3.9) with 3.3 Ah battery

340

Yes

Yes (possible to adjust with adjust grip)

2.0 / 3.3

* Adjust grip for pre-setting torque ............................... 1 pc. (only for Italy and USA.)

* Protector ..................................................................... 1 pc. (only for Germany)

* Protectors (red, blue, yellow)

* Adjust grip for pre-setting torque

* Grip base set

* Grip 37

* Battery BH1220 12V, 2.0Ah

* Battery BH1233 12V, 3.3Ah

* Charger DC24SA

* Charger DC14SA

* Automatic refreshing adapter ADP03

The above model with built-in job light is the 12V version

of BFT120F for getting high turning angle in the fastening

with soft joint.

Repair P 2 / 12

< 1 > Lubrication

Apply MAKITA grease N. No.2 to the following portions marked with black triangle to protect

parts and product from unusual abrasion.

(28)

(31)

(38) (39) (41) (42) (44) (46)

(29)

(24)

24 16 pcs.

(40) (47)

Flat washer 18

Flat

washer 12

Item

No. Descriptions The portion to be lubricated Used

quantity Amount

of lubricant

Steel ball 3

42 38 pcs.Steel ball 3 Approx. 0.5 g

in total

Approx. 1.4 g

in total

28 1 pc.

Clutch ring

Switch lever

The surface where (29) Steel balls 4

are mounted. Approx. 0.3 g

39 1 pc.

Carrier complete A

40 4 pcs.Spur gear 17 Teeth portion

41 1 pcs.Inner gear 46 Teeth portion

44 1 pcs.Internal Inner gear Teeth portion

Teeth portion

The 4 shafts for accepting

(40) Helical gears 17.

46 1 pc.Spur gear 10

complete The 4 shafts for accepting

(47) Spur gears 31.

29 3 pcs.

3 pcs.

Steel balls 4 Approx. 0.1 g

in total

1 pc.Spindle Approx. 0.9 g

1 pc. Approx. 0.1 g

47 Spur gear 31.

< 2 > Disassembling bit holder section

Remove ring spring with No.1R291 "Retaining ring S and R pliers" from spindle as illustrated in Fig. 1.

Then, bit holder section can be disassembled as illustrated in Fig. 1A.

1R291

Retaining ring S and R pliers

Ring spring

Sleeve

Flat washer 11

Compression spring 13

Steel ball 3.0 x 2 pcs.

Spindle Spindle <Note>

Be careful, not to lose

compression spring 13

and steel ball 3 in this

step.

Fig. 1 Fig.1A

Repair P 3 / 12

< 3 > Assembling bit holder section

Mount the parts to spindle in the following order.

1. 2 pcs. of steel balls 3 3. Compression spring 13

2. Sleeve 4. Flat washer 11

And then, secure the above parts with ring spring. See Fig. 1A and Fig. 1

< 4 > Separating motor section from gear assembly

(1) Take off brush holder caps and carbon brushes, and then unscrew 10 pcs. of pan head screws M3x20. See Fig. 2.

(2) Take off housing L. And then, disconnect the connector of switch unit. Separate endbell complete from motor

section. See Fig. 3.

(3) Separate motor section from gear assembly by turning motor bracket anti-clockwise. See Fig. 4.

(4) Remove motor bracket with 1R269 "Bearing extractor". Then, armature can be separated from yoke unit.

See Fig. 5.

Brush holder cap

Carbon brush

Pan head screws M3x20

Fig. 2 Fig. 3

Housing L

Disconnected

connector of

switch unit

Endbell

complete

Motor bracket

1R269 Bearing extractor

Motor section

Gear assembly

Fig. 4.

Fig. 5

Motor bracket Yoke unit

Armature

Repair P 4 / 12

< 5 > Mounting motor section and gear assembly to housing

Motor bracket

Motor section

Gear assembly

Fig. 6.

Fig. 7

Motor bracket

Yoke unit

Armature

Fig. 8

(1) Pass armature through yoke unit. And mount motor bracket to armature. See Fig. 6.

(2) Insert motor bracket of motor section into gear assembly. And lock motor section by turning motor bracket

clockwise. See Fig. 7.

Check the engagement of armature with spur gear 31 of gear assembly by turning armature with your hand.

(3) Mount endbell complete to the motor section, assembled as illustrated in Fig. 7. And then, mount this motor section

to housing R with aligning the flat portion of yoke unit with the rib of housing R.

Connect the connector of switch unit with the connector of controller. See Fig. 8.

<Note>

Be careful, not to be pinched your finger

between yoke unit and armature.

Because, armature is pulled toward yoke

unit with the strong magnetic force.

Check the engagement of

armature with gear by

turning armature.

Endbell complete

Flat portion

of yoke unit Accept the flat portion

of yoke unit with this

portion.

Connect the connector of switch unit

(purple and yellow lead wire)

with the connector of controller.

(purple and yellow lead wire.)

Connectors of controller

Controller

Repair P 5 / 12

(4) Mount the following parts to housing R before mount housing L. See Fig. 9.

(5) Mount housing L and secure it with 10 pcs. of pan head screws M3x20. See Fig. 10.

* Pin 2.5

* Plate

* Lens

* Terminal

* Buzzer circuit

* F.R. Change lever

* LED circuit

Plate

Lens

LED circuit

Terminal

F.R. Change lever

Pin 2.5

Be careful, not to pinch

the lead wire of LED circuit

with housing L.

Pass lead wire between

screw hole and the wall

of housing R.

Buzzer circuit

Fig. 9

Fig. 10

Housing L

Pan head screws M3x20

Repair P 6 / 12

< 6 > Disassembling gear assembly

( 1 ) After removing bit holder section, remove spring holder section (front cover, spring holder A, thin washer 30,

compression spring 30, thin washer 24 and torque plate).

1. Take off front cover, and remove spring holder A by turning it anti-clockwise. See Fig. 11.

2. Then, the following parts can be separated from gear case complete. See Fig. 11.

( 2 ) Remove lock washer by turning it with small screwdriver anti-clockwise. See Fig. 12.

( 3 ) Remove 3 pcs. of spur gears 31 and spur gear 10 complete. And then, remove internal gear case

by unscrewing 4 pcs. of tapping screws 3x12. See Fig. 12.

Fig. 11

Fig. 12

Spur gear 10

complete

Spur gears 31

Internal gear case

Tapping

screws 3x12

Gear case complete

* Thin washer 30

* Compression spring 30

Front cover Spring holder A

Thin washer 30

Compression

spring 30

Thin washer 24 Torque plate

Lock washer

Retaining

ring S-12

2 pcs. of flat

washers 12

16 pcs. of steel balls 3

< Note >

After removing, make sure, whether 16 pcs of

steel balls 3 are remain, or not.

Fig. 13 Fig. 14

38 pcs. of

Steel balls 3 3 pcs. of

Steel balls 4

Flat washer 18

Spur gears 17

Carrier

complete A

Clutch ring

Inner gear 46

<Note>

After removing, make sure, whether 38 pcs of steel balls 3

are remain, or not.

( 4 ) Remove flat washer 18, 38 pcs. of steel balls 3, spur gears 17 and carrier completeA.

Remove inner gear 46, clutch ring and 3 pcs.of steel balls 4. See Fig. 13.

( 5 ) Take off retaining ring S-12. Then, 2 pcs. of flat washers 12 and 16 pcs. of steel ball 3 can be removed from

spindle. See Fig. 14.

* Thin washer 24

* Torque plate

Repair P 7 / 12

< 7 > Assembling gear assembly

( 1 ) Mount flat washer 12 to spindle. And apply MAKITA grease N No.2 to the spindle. See Fig. 16.

Flat

washer 12 Spindle

Apply MAKITA grease N No.2.

Fig. 16 Fig. 17

( 2 ) Mount the spindle to gear case complete. See Fig. 17.

( 3 ) Mount flat washer 12 and 16 pcs. of steel balls 3 (MAKITA grease N No.2 is applied to them.) and the

another flat washer 12 to spindle.

And then, secure the flat washers 12 and steel balls 3 with retaining ring S-12. See Fig. 18.

( 4 ) Mount flat clutch ring, 3 pcs. of steel balls 4 and inner gear 46 to gear case complete. See Fig. 19.

( 5 ) Mount carrier complete A, 3 pcs. of spur gears 17, 38 pcs. of steel balls 3 and flat washer 18. See Fig. 20.

Flat washers 12

Spindle

Fig. 18

Retaining

ring S-12

2 pcs. of flat washers 12

16 pcs. of steel balls 3

< Note >

Be careful, not to lose steel balls 3

in this stage.

Retaining

ring S-12

Flat washer 12 Flat washer 12

Steel ball 3

Spindle

Gear case complete

Clutch ring

Inner gear 46

Steel balls 4

Fig. 19 Fig. 20

38 pcs. of Steel balls 3

Flat washer 18

<Note> Before mounting, make sure, whether 38 pcs. of steel balls 3

are remain, or not.

Spur gears 17

Carrier

complete A

( 5 ) Remove spindle by pushing toward the armature side. See Fig. 15.

Fig. 15

Flat washers 12

Spindle

This flat washer 12 can remain in the gear case assembly,

when removing spindle.

Repair P 8 / 12

( 6 ) Mount internal gear case to gear case complete with aligning the boss of internal gear case with the concave

portion of gear case complete. Secure internal gear case with 4 pcs. of taping screws 3x12. See Fig. 21.

( 7 ) Mount spur gear 10 complete and 3 pcs. of spur gears 31, and mount lock washer by turning it clockwise.

And then, mount torque plate to gear case complete. See Fig. 22.

( 8 ) Put compression spring 2 into switch lever, and apply MAKITA grease N.No.2 to both upper and lower side

of switch lever. Mount this switch lever to gear case complete. See Fig. 23.

( 9 ) And then, pushing holder plate toward armature side, secure it with 1 pc. of tapping screw bind PT3x10.

See Fig. 24.

(10) Pushing switch unit toward armature side, secure it on holder plate with 1 pc. of pan head screw M2.3 x 10.

See Fig. 25. The fastening torque for pan head screw M2.3 x 10 is approx. 0.3 - 0.4 N.m.

Internal gear case

Tapping

screws 3x12

Gear case complete

Concave portion of

gear case assembly Boss portion of

internal gear case

Fig. 21

Fig. 22

Spur gear 10

complete Spur gears 31 Lock washer

Fig. 23 Fig. 24

Fig. 25

Torque plate

Compression

spring 2

Switch lever

Switch unit

Holder plate

Tapping screw

bind PT3x10

Tapping screw bind PT3x10

Bottom view of gear case complete

Gear case complete Holder plate

Torque plate Torque plate

Pan head

screw M2.3 x 10

Pan head

screw M2.3 x 10

Switch unit

Push toward

armature side.

Push toward

armature side.

Push toward

armature side.

Repair P 9 / 12

(11 ) Mount thin washer 24, compression spring 30, thin washer 30 and spring holder to gear case complete.

Turn spring holder and adjust as illustrated in Fig. 26.

And then, mount front cover. See Fig. 26.

Fig. 26

Thin washer 24

Compression spring 30

Thin washer 30

Spring holder

Already mounted "torque plate"

Less than 52mm

Turn spring holder

clockwise 4.5 turns, and

keep the distance mentioned

in Fig. 27.

Front cover

< 8 > Disassembling and assembling switch

(1) After separating F.R.change lever from switch, unscrew the screw fastening micro switch, and turn

the micro switch with pulling it up as illustrated in Fig. 27. Then, micro switch can be separated from switch.

(2) When assembling, secure micro switch with the fastening torque approx. 0.29 - 0.34 N.m.

(3) Aligning the F.R. change lever's concave with the boss of switch, mount F.R.change lever to switch. See Fig.28.

Screw, fastening

micro switch with

fastening torque

0.29 - 0.34 N.m

Micro switch

Turn the micro switch in

the direction of the colored

arrow with pulling it up.

Fig. 27 Fig. 28

F.R.Change lever Concave portion

of F.R. change lever Boss of switch

Circuit diagram P 10 / 12

Color index of lead wires

Black White

Red

Orange Blue

Yellow

Purple Gray

Connector

Switch

Micro switch

Reverse switch

COM

LED

Circuit

Buzzer

Circuit

Connector

Controller

Connector

Switch unit

DC Motor

Terminal

< Note >

For BFT120, the LED circuit is not installed.

Indicator lamp is

built in the controller.

Wiring diagram

(1) Connecting the receptacles with the terminals of switch

Lead

holders

Endbell's

lead wire (black)

Controller's

lead wire (blue)

Controller's

lead wire (white)

Micro switch side

Housing R side

View from micro switch side

View from housing R side

Hold the following

lead wires with lead

holders.

* Endbell's lead wire (black)

* Controller's lead wire (white)

Endbell's lead

wire (red)

Controller's

lead wire (purple)

Controller's

lead wire (white)

Controller's

lead wire (orange)

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