Hitachi FDS 12DV User manual

MODEL FDS 12DV
1. REPAIR GUIDE
Without fail, remove Type FEB 12 Battery from the main body of the tool before attempting repair work. Because
the tool is cordless, if the battery is left in and the switch is activated inadvertently, the motorwill start rotating
unexpectedly and could cause serious injury.
1-1. Precautions inDisassembly andReassembly of the Main Body
The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded
assembly diagram.
1-1-1. Disassembly
(1) Removal of the Drill Chuck [8]: (Fig. 7)
Remove the Drill Chuck [8]fromthe Spindle Gear and Set[14] of the fully assembleddriver drill in
accordance with the following procedures.
(a) Set theShift Knob[16]to the "L" position toshift the gears tothelow-speed setting.
(b) Align the white line on the Cap [9] with the drill mark ( ).
(c) Fully open the jaws of the Drill Chuck [8], and removethe M5 x 20 Flat Hd. Screw[7]. (Be sure to
remember that the M5 x 20 Flat Hd. Screw [7] is left-hand threaded, and must beloosened by turning it to
the right [clockwise].)
(d) Insert an M10 hex. bar wrench into the Drill Chuck [8],and strike it gently in a counterclockwise direction
with a wooden orplastic hammer to loosen it. After the drill chuck has been loosened, continue to rotate it
counterclockwise by hand to remove it from the main body.
(2)Disassembly of housing (B):
Remove the seven D3 x 14 Tapping Screws [4] which fix the main body. Then grasp the lowerportions of
housing (A) and housing (B) where the battery is inserted, and gently separate them.
−1−
LoosenHex. bar wrench
Drill Chuck [8]
Cap [9]
White lineDrill mark
Shift Knob [16]
Fig. 7

(3) After housing (B) has been removed, the partsinside may either be removed together in an assembled state,
or removed individually. First, remove the ShiftArm[15] and Shift Knob [16], being very careful not toallow
the Shift Spring [17] tofly out unexpectedly.
(4) Removal of the Motor [21]
(a)Take off the Cap [9],Spring Holder[10], Spring [11], Thrust Plate [12],and Steel Balls [13], in that order.
At this time, be particularly careful not to lose the four Steel Balls [13].
(b) Remove the four D3 x 8 Tapping Screws [18], andremovetheMotor [21].
(5) Disassembly of electric components
[NOTE] The three lead wires from the FET (Field Effect Transistor) and the two lead wires from the diode are
permanently connected to the DC-speed control switch [21]and should not be detached.
Remove the two M3x10 FT Screws [25]. The FET of the DC-speed control switch [22] and the Fin Ass'y
[26] can then be disassembled. Then,use a soldering iron todisconnect the leadwires of theDC-speed
control switch [22] from the Motor[21] and thelead wires of the DC-speed control switch [22] fromthe
Terminal [27].
1-1-2. Reassembly
Perform reassembly in the reverse order of disassembly while observing the given precautionsand taking care
of the following points.
(1) Reassembly of electric components
(a) Ensure that the wiring is connected as shown in the diagram in Fig. 8.
−2−
Positive terminal
Motor [21]
Lead wire (white)
DC-speed control switch [22]
Diode
M3x 10 FT Screw [25]
Lead wire (yellow)
Terminal [27]
Lead wire (white)
Fin
M3 x 10 FT Screw [25]
Lead wire (yellow)
Negative terminal
The red mark indicates the
positive ( ) terminal side.
FET
Fig. 8

(2) Connecting the Spindle and Gear Set [14]andthe
electric components assembled as described in
Para. (1)
Whenconnecting the Spindle and Gear Set [14]
and the electric components assembledas
described in Para. (1) above, ensure that the
colored lead wires soldered to the Motor [21]are
correctly positioned with relation to the notched
portion of the Spindle and Gear Set [14]before
fastening the two sections with the four D3 x 8
Tapping Screws [18]. (See Fig. 9)
(3) Reassembly of the clutch section
Assemble the Cap [9]and Shift Arm [15] onto the Spindle and Gear Set [14]. (See Fig. 10)
During assembly, be very carefulnot toallowthe four Steel Balls [13] to drop out of the Spindleand Gear Set
[14].
(a) When assembling the Spindle Holder [10] onto the Spindle and Gear Set[14], ensure that the notched
portions of the Spindle and Gear Set [14] are properly aligned with the matching protruding portions of the
Spring Holder [10]. (See Fig. 11)
−3−
Spindle and Gear Set [14]
Internal wire (yellow)
Motor [21]
TappingScrew D3 x 8 [18]
Notched portion
Fig. 9
[9] [10] [11] [12] [14] [15]
[13]
Internal wire
(yellow)
White line Fig. 10
Protruding portions
Notched portion
Notched portions
Protruding portion
Fig. 11

(b) When assembling theCap [9]onto the components assembled as described in Para. (a) above, ensure
that the white line on the Cap [9] is properly aligned with relation tothe colored lead wires soldered tothe
Motor [21]. (See Fig. 10)
(c) When assembling the ShiftArm [15] onto
the Spindle and Gear Set [14], ensure that
the protruding portions oftheShift Arm
[15] are properly fitted into the matching
grooves of the ring gear inside the Spindle
and Gear Set [14]. (See Fig. 12)
(d) Insert theShift Spring[17]intotheShift Knob[16]. (See Fig. 13)
(e) Assemble Bit Holder (A)[19] andBit Holder(B) [5] respectively into housing (A) and housing(B) ofthe
Housing (A) (B) Set[3]. At this time, ensure that the insert portions of the bit holders are properly installed
into the insert receiving sockets of the housings. (SeeFig. 14)
(f)Mount thecomponents assembled as described in Para. (d)onto the protrudingportions of theShiftArm
[15]that is mounted on the components assembledas describedin Para. (a). (SeeFig. 15)
−4−
Shift Arm [15]
Protruding
portions
Ring gear
Spindle and
Gear Set [14]
Grooves
Fig. 12
Shift Knob [16]
Insert portion
Insert receiving pocket
Bit Holder (A) [19]
Housing (A)
Shift Spring [17]
Fig. 13 Fig. 14
Fig. 15
Protruding portion
Parts assembled in Para. (d)
Parts assembled in Para. (a)
Shift Arm[15]

(g) Mount the components assembled as described in Para. (f) onto the components assembled as described
in Para.(e).At this time, ensure that colored leadwires solderedto theTerminal [27] are properly aligned
with relation to housing (A) and housing, (B). (See Fig. 16)
(4) Other Precautions on Reassembly
(a) On completion of reassembly, set the Shift Knob[16] to the "H" position, and confirm that the spindle
rotates smoothly when the Drill Chuck [8]is moved byhand. Also,before turning the switch ON, confirm
that the Cap [9]can be properly aligned with the clutch number positions, marked on the Housing (A),(B)
Set[3].
Confirm that the Drill Chuck [8] rotation conforms with the setting position of the reversing switch. When
the reversing switch is set tothe (R) side, theDrill Chuck [8] must rotateto the right (clockwise) when
viewed from the rear (the end opposite from the drill chuck).
Also, confirm that the rotation speed of the Drill Chuck [8]changes properly between high and low speeds
when the Shift Knob [16] position is changed.
Check the run-out of the Drill Chuck [8]. With a 6 mm test bar (Special Repair Tool J-223-2, Code No.
305713) mounted in the Drill Chuck [8],ensure that run-out is not more than 0.5mm when measured at a
distance of 50 mm from the end of the chuck.
(b) (+) Tapping Screws D3 x 8 [18] 0.59 - 0.78 Nm (6 - 8 kgfcm, 5.2 - 6.9 In-lbs)
(+) Tapping Screws D3 x 14 [4] 0.98 - 1.5Nm (10 - 15 kgfcm, 8.7 - 13.0In-lbs)
(+) FT Screw M3 x 10 [25] 0.88 - 1.1Nm (9 - 11 kgfcm, 7.8 - 9.5 In-lbs)
Flat Hd Screw M5 x 20 [7] 3.9Nm ( 40 kgfcm, 34.7 In-lbs)
Drill Chuck [8] 3.9Nm ( 40 kgfcm, 34.7 In-lbs)
1-2. Precautions inDisassembly andReassembly of the Model UC 12SC charger
For details, concerningthe disassembly, reassembly and precautions in use of the Model UC 12SC charger,
please refer to the Technical Data and Service Manual for the Model UC 12SC charger.
−5−
Internal wire (white)
Housing (A)
Parts assembled in Para. (f )
Internal wire (yellow)
Terminal [27]
Parts assembled in Para. (e)
Fig. 16

2. STANDARD REPAIR TIME (UNIT) SCHEDULES
−6−
Cap
Spring Holder
Spring
Thrust Plate
Steel Ball
(4 pcs)
Spindle and
Gear Set
Work Flow
FDS 12DV
Housing
(A)(B) Set
Shift Arm
Shift Knob
DC-speed
control switch
Motor
FinAss'y
Terminal
General AssemblyDrill Chuck
MODELVariable
Fixed 10 20 304050 60 min.