Hitachi FDV 16VB, FDV 16T, FDV 16 Disassembly & Reassembly Procedures
MODELS
FDV
16
VB/FDV
16T/
FDV
16
−
1
−
1. PRECAUTINS IN DISASSEMBLY AND REASSEMBLY
The
[Bold]
numbers in the descriptions below correspond to the item numbers in the parts exploded
diagram of the FDV 16VB and the numbers in
<Bold>
to those in the parts exploded diagram of the
FDV 16T and the numbers in
(Bold)
to those in the parts exploded diagram of the FDV 16.
1-1. Disassembly
1-1-1. Removal of the Drill Chuck
(1) For keyless chuck (FDV 16VB only)
The Drill chuck
[3]
(keyless chuck) is fixed to the Spindle
[4]
with a UNF 1/2"-20 right-hand thread and
the Flat Hd. Screw (A) (Left hand) M6 x 25
[1]
. First, open the jaws of the keyless chuck fully. Insert a
14 mm wrench into the wrench mounting portion of the Spindle
[4]
and turn the Flat Hd. Screw (A)
clockwise to remove it. Then, fit the hexagonal bar wrench for M10 into the keyless chuck and turn it
counterclockwise to loosen and remove the keyless chuck.
(2) For conventional chuck (with chuck wrench) (FDV 16VB, FDV 16T, FDV 16)
The Drill Chuck
[3] <2> (2)
is fixed to the Spindle
[4] <3> (3)
with a UNF 3/8"-24 right-hand thread and Flat
HD. Screw (A) (Left hand)
[1]
(For FDV 16VB only). As shown in the figure below, fit a J-78 ring ass’y
(special repair tools, Code No.970817 and 970818 are recommended.) ont o t he Dr ill Chuck body , and
secure it in a vise. At this time, ensure that the pin of the ring ass’y is properly inserted into the chuck
wrench mounting hole of the chuck. Open the jaws of the Drill Chuck
[3]
fully and turn the Flat Hd.
Screw (A)
[1]
clockwise with a flat-blade screwdriver to remove it (For FDV 16VB only). Then, fit a
14 mm wrench to the flat surfaces on the Spindle, and rotate it counterclockwise to loosen and remove
the Drill Chuck.
Hexagonal bar wrench for M10
Drill Chuck
[3]
Vise
14 mm wrench
Main body
Wrench mounting portion of Spindle
[4]
Wrench mounting
portion of Spindle
[4] <3> (3)
14 mm wrench
Drill Chuck
[3] <2> (2)
J-78 ring ass’y
Vise
− 2 −
1-1-2. Removal of Housing (B) of the Housing (A), (B) Set [18] <17> (17)
(1) Cut the Label
[29]
with a cutter along the groove between the assembled Housing (A) and (B) Sets
[18]
(For FDV 16VB only).
(2) Remove the seven D4 x 20 Tapping Screws (W/Flange)
[20] <19> (19)
and take off Housing (B) of the
Housing (A), (B) Set
[18] <17> (17)
.
1-1-3. Disassembly of the A rmature and Stator
(1) Remove the two Brush Holders
[22] <21> (21)
by lifting them upward from Housing (A) of the Housing
(A), (B) Set
[18] <17> (17)
, and take out the two Carbon Brushes
[20] <20> (20)
.
(2) With the Change Plate
[11] <10> (10)
, the Change Knob
[10] <9> (9)
and the Spring (A)
[12] <11> (11)
installed, remove the Holder
[13] <12> (12)
, the Armature
[15] <14> (14)
, the Stator
[16] <15> (15)
and the
Gear
[8] <7> (7)
all together.
(3) Remove the Spindle
[4] <3> (3)
and the Gear
[8] <7> (7)
together from the Holder
[13] <12> (12)
. Be
careful not to lose the Steel Ball D4.76
[9] <8> (8)
.
(4) By pulling out the Armature
[15] <14> (14)
from the Holder
[13] <12> (12)
, the Ball Bearing
[14] <13> (13)
can be removed together with the Armature. Remove the Ball Bearing from the Armature with the
bearing remover.
(5) Remove the Internal Wires
[24] [26] [35] [36], <22> <23> <31> <32>, (22) (23) (31) (32)
and the Choke Coils
[23] [27]
from the Stator
[16] <15> (15)
.
1-1-4. Disassembly of the Holder, Gear and Spindl e
(1) Remove the Change Plate
[11] <10> (10)
, the Change Knob
[10] <9> (9)
and the Spring (A)
[12] <11>
(11)
from the Holder
[13] <12> (12)
.
(2) By pushing the Spindle
[4] <3> (3)
toward the chuck while holding the chuck side surface of the Gear
[8] <7> (7)
, the Gear can be removed. By removing the D12 Retaining Ring
[7] <6> (6)
from the Spindle
[4] <3> (3)
, the Spring
[5] <4> (4)
and Ball Bearing
[6] <5> (5)
can be removed.
Label
[29]
(FDV 16B only)
Groove
Housing (B)
Housing (A)
Housing (A), (B) Set
[18] <17> (17)
Cut with a cutter
(FDV 16VB only)
− 3 −
1-1-5. Disconnecting Internal Wires and Electrical Parts
(1) Disconnect the internal wires from the switch as follows.
Insert the J-86 pin into the hole for the internal wire of the Switch
[25] <24> (24)
. Press the leaf spring so
that the internal wire can be disconnected, then disconnect the Int ernal Wires
[23] [24] [26] [27] [35] [36]
,
<31> <32>, (31) (32)
and the Internal Wires of the Choke Coil
[23] [27]
and the Noise Suppressor
[37] <33> (33)
. (For the internal wire of the Cord
[34] <30> (30)
, loosen and remove the terminal screw of
the Switch
[25] <24> (24)
with a slotted screwdriver.) If the leaf spring is pressed too much, t he leaf
spring may be set permanently and the contact pr essur e w it h the internal wire will be reduced. Replace
such switch whose leaf spring has clearance of 0.5 mm or more with new one.
(2) After removing the two Tapping Screws (W/Flange) D4 x 16
[33] <29> (29)
, the Cord
[34] <30> (30)
and
the Cord Clip
[32] <28> (28)
can be removed from the Housing (A) of the Housing (A), (B) Set
[18] <17> (17)
.
1-2. Reassembly
Reassembly can be accomplished by following the disassembly procedures in reverse. However, special
attention should be given to the following items.
1-2-1. Reassembly of the Armature and the Stator
(1) Press fit Ball Bearing 608VVMC2EPS2L
[14] <13> (13)
and Ball Bearing 626VVMC2ERPS2S
[17] <16> (16)
onto the Armature
[15] <14> (14)
. Stop pressing when Ball Bearing 608VVMC2EPS2L
[14] <13> (13)
comes in contact with the Fan. With a vernier caliper or similar tool, check that the pressfit dimension is 123.8 mm as shown in the following figure. As excessive press fitting can cause
deformation or other damage to the Fan, particular attention is required. Also, if press fitting is
insufficient, it will cause loss of thrust of the Armature
[15] <14> (14)
, resulting in heat generation.
Accordingly, press-fit Ball Bearing 626VVMC2ERPS2S
[17] <16> (16)
until it butts against the stepped
portion of the shaft.
-0.3
Leaf spring
Insert
Internal wire
0.5 max.
Pull out
J-86 pin
0
− 4 −
1-2-2. Reassembly of the Holder
(1) When installing the Change Plate
[11] <10> (10)
and Spring (A)
[12] <11> (11)
to the Holder
[13] <12> (12)
,
be careful of the direction of each part.
(2) Insert the Armature
[15] <14> (14)
and the gear spindle ass’y into the Holder
[13] <12> (12)
, and insert
them into the Stator
[16] <15> (15)
. Be sure to reassemble the Steel Ball D4. 76
[9] <8> (8)
at this time.
Apply ATTOLUB MS No.2 to the ball chamber of the Spindle
[4] <3> (3)
and then reassemble the Steel
Ball D4.76.
(3) Install the reassembly from the above step (2) in the Housing (A) of the Housing (A), (B) Set
[18] <17> (17)
. Check that the fan of the Armature
[15] <14> (14)
can be turned freely by finger.
1-2-2. Other
When re-mounting Housing (A) of the Housing (A), (B) Set
[18] <17> (17)
, be very careful to ensure that the
lead wires are not excessively slack, and that they are not pinched bet ween components during
reassembly.
Ball Bearing
608VVMC2EPS2L
[14] <13> (13)
Fan
Armature
[15] <14> (14)
Stepped portion of shaft
Ball Bearing
626VVMC2ERPS2LS
[17] <16> (16)
123.8
-0.3
0
Change Plate
[11] <10> (10)
Spring (A)
[12] <11> (11)
Ratchet
Holder
[13] <12> (12)
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