Hitachi WH 10DAL User manual

PRODUCT NAME
Hitachi 10.8 V Cordless Impact Driver
Model WH 10DAL
International Sales Division W
REPAIR GUIDE ---------------------------------------------------------------------------------------------------------------- 1
1. Precautions on disassembly and reassembly------------------------------------------------------------- 1
2. Precautions on disassembly and reassembly of the battery charger ------------------------------- 7
STANDARD REPAIR TIME (UNIT) SCHEDULES -------------------------------------------------------------------- 8
CONTENTS Page
LIST No.
WH 10DAL: J882
Jun. 2014

-1-
• Removal of guide sleeve (C)
WARNING: Be sure to remove the Type BCL 1015 battery from the main body before starting repair
or maintenance work. Because the tool is cordless, inadvertently activating the switch
with the battery left in the main body will start the motor rotating unexpectedly, and
could cause serious injury.
1. Precautions on disassembly and reassembly
[Bold] numbers in the description below correspond to item numbers in the Parts List and exploded
assembly diagram for the Model WH 10DAL.
1. Removal of guide sleeve (C)
(1) Follow the procedure shown in Figs. 1 to 4 below to remove the Retaining Ring [2], Washer (F) [3],
Guide Spring (C) [4] and Guide Sleeve (C) [5] in this order. Avoid quickly raising the Retaining Ring
[2]; otherwise, it may suddenly spring out. Be sure not to lose the two Steel Balls D3.175 [8] in the
Anvil [9].
Hold the body and adjust the gap of the Retaining Ring [2]
to the groove of the Anvil [9], then insert a small flat-blade
screwdriver into the groove at an angle.
Press down Washer (F) [3] with the small flat-blade
screwdriver.
Slide the small flat-blade screwdriver under one side of the
gap of the Retaining Ring [2].Slowly raise the Retaining Ring [2] using the end face of Guide Sleeve (C) [5] as a fulcrum.
Disassembly
REPAIR GUIDE
Small flat-blade screwdrive
r
Anvil [9]
Retaining Ring [2]
Washer (F) [3]
Gap of the Retaining
Ring [2] Guide Sleeve (C) [5]
Fig. 1 Fig. 2
Fig. 3 Fig. 4

-2-
Fig. 5 • Disassembly of the hammer assembly
Raised face of hammer
Steel Balls D5.556 [10]
Steel ball guide groove
S
p
indle
[
16
]
Push down.
Washer (S) [14]
J-297 base for washer (S)
Hammer Spring (E) [13]
Stopper (A) [15]
Top of spindle cam
Hammer [11]
Spindle [16]
2. Removal of the exterior parts
(1) Insert a small flat-blade screwdriver between the Front Cap [6] and Hammer Case [7], and then
remove the Front Cap [6] from the Hammer Case [7].
3. Removal of housing (A).(B) set
(1) Remove the eight Tapping Screws (W/Flange) D3 x 16 (Black) [35] to remove housing (B) from the
Housing (A).(B) Set [29].
(2) Remove the Hammer Case [7], hammer assembly, Ring Gear [21], Motor DC 12V [23] and Switch
Terminal Set [33] as one unit. Remove Pushing Button (A) [32].
4. Disassembly of the hammer assembly
(1) Mount the hammer assembly onto the J-297 base for washer (S) (a special tool). With a hand press,
push down the top of the Spindle [16] to compress Hammer Spring (E) [13]. In this position, remove
Stopper (A) [15] with a small flat-blade screwdriver, and then release the hand press.
(2) Remove the hammer assembly from the J-297 base for washer (S) and support the end surface of the
Spindle [16]. With a hand press, push down either of the raised faces of the Hammer [11] to compress
Hammer Spring (E) [13]. In this position, extract the two Steel Balls D5.556 [10] from the cam grooves
of the Spindle [16] and Hammer [11] with a small flat-blade screwdriver.
(3) Slowly release the hand press and lift the Hammer [11] and Washer (S) [14] together to extract both
from the Spindle [16]. Remove Hammer Spring (E) [13].
5. Disassembly of the switch terminal set
Disconnect the internal wires (red and black) coming from the Motor DC 12V [23] from the Switch
Terminal Set [33] by unsoldering.
NOTE: Do not remove the switch and controller from the Switch Terminal Set [33].

-3-
Fig. 6 • Reassembly of the power supply unit (1)
Perform reassembly by reversing the order of the disassembly procedure. However, special attention
should be given to the following items.
1. Reassembly of the power supply unit
NOTE: Perform wiring according to Figs. 6 and 7 being careful of the internal wiring and the
connecting direction.
(1) Solder the internal wires to the motor and the DC switch according to the following steps (a) and (b)
being careful of the soldering terminals and color of internal wires. (See Figs. 6 and 7.)
(a) Solder the red internal wire of the Internal Wire Ferrite Set [30] to the positive side (red marked
side) of the Motor DC 12 V [23] and the M1 terminal of the DC switch.
(b) Solder the black internal wire of the Internal Wire Ferrite Set [30] to the negative side (opposite to
the red marked side) of the Motor DC 12 V [23] and the M2 terminal of the DC switch.
(2) Push the internal wires of the Switch Terminal Set [33] in the ribs and grooves of housing (A) to
prevent the internal wires from being caught. (See Figs. 6 and 7.)
(3) Fit the protrusion of the forward/reverse changeover lever of the Switch Terminal Set [33] in the hole of
Pushing Button (A) [32], and then mount it to housing (A).
NOTE: Black oxide or separated plating on terminal support contacts to be connected to the
battery will increase the temperature of the contacts and damage the battery or driver body.
Replace the Switch Terminal Set [33] with a new one.
Reassembly
Motor DC 12 V [23]
Internal Wire Ferrite Set [30]
Switch Terminal Set [33]
DC switch
Battery terminal LED light
(40)
(35)
Black internal wire
Red internal wire
Red mark
Positive side
Negative side
Red internal wire
Black internal wire

-4-
Fig. 8 • Reassembly of the hammer assembly (1)
Fig. 7 • Reassembly of the power supply unit (2)
Contact surface with the
Motor DC 12 V [23] Ring Gear [21] Packing (A) [22]
2. Reassembly of the hammer assembly
(1) Put Washer (S) [14] onto the shaft of the Spindle [16] and mount the Hammer [11] containing the
twenty-eight Steel Balls D3.175 [8], Washer (J) [12] and Hammer Spring (E) [13] to the Spindle [16].
(2) Align the top of the cam groove on the Spindle [16] with the steel ball guide groove on the Hammer
[11]. Press down either of the raised faces of the Hammer [11] with a hand press to compress
Hammer Spring (E) [13] until the end surface of the hammer contacts the flange of the Spindle [16].
(3) Insert the two Steel Balls D5.556 [10] into the steel ball guide groove. Confirm that the Steel Balls
D5.556 [10] are properly inserted in the cam groove. Then release the hand press.
(4) Mount the hammer assembly onto the J-297 base for washer (S). With a hand press, push down the
top of the Spindle [16] to compress Hammer Spring (E) [13]. In this condition, mount Stopper (A) [15]
onto the spindle shaft, and then release the hand press.
(5) Insert the tip of the Spindle [16] into the Anvil [9] and cover it with the Hammer Case [7].
(6) Fit Packing (A) [22] onto the contact surface with the Motor DC 12 V [23] of the Ring Gear [21], by
aligning the center hole and the cross-shaped portion.
Put the internal wires between
the ribs of housing (A).
Battery terminal of the
Switch Terminal Set [33]
Housing (A).(B) Set [29]
Convex portion
Convex portion
Concave portion
Concave portion

-5-
Fig. 9 • Reassembly of the hammer assembly (2)
Fig. 10 • Reassembly of housing (A).(B) set (1)
Ring gear ribs
Hammer case ribs
Apply silicone rubber to the shaded areas.
Housing (A) Housing (B)
(7) Confirm that the Spindle [16] is inserted into Washer (G) [19]. Mount the Ring Gear [21] so that its ribs
are perpendicular to the ribs of the Hammer Case [7], while being careful of meshing between the Idle
Gear [17] of the hammer assembly and the Ring Gear [21].
(8) Mount Packing (A) [22] to the Ring Gear [21]. Then check that the Motor DC 12 V [23] turns smoothly.
If not, the gears are meshing improperly. Check the meshing condition.
3. Reassembly of housing (A). (B) set
(1) Apply silicone rubber (Three Bond 1211) to the shaded areas shown in Fig. 10 before mounting the
parts to housing (A).
(2) Mount a unit of the Hammer Case [7], Ring Gear [21] (including the Motor DC 12V [23]) and Switch
Terminal Set [33] into housing (A).
(3) Pay attention to the following when mounting:
• Mount the Hammer Case [7] to the housing so that the protrusion of the Hammer Case [7] (for
locking) contacts the concave portion of the housing as shown in Fig. 10.
• Confirm that the Hammer Case [7] is mounted to the housing properly. If the Hammer Case [7] is not
fitted in the specified groove of the housing or the ribs of the Ring Gear [21] are not perpendicular to
the ribs of the Hammer Case [7], properly remount the Hammer Case [7]. Be sure to properly mount
the Hammer Case [7] to the housing to prevent it from slipping off in the axial direction.
(4) Fit the convex portion of the battery terminal of the Switch Terminal Set [33] in the concave portion of
Housing (A).(B) Set [29], and fit the convex portion of Housing (A).(B) Set [29] in the concave portion
of the battery terminal of the Switch Terminal Set [33]. (See Fig 7.)
(5) Apply silicone rubber (Three Bond 1211) to housing (B) in the same area as for housing (A). Mount
housing (B) and secure it with the eight Tapping Screws (W/Flange) D3 x 16 (Black) [35]. Use a cloth
to wipe off all jammed-out silicone rubber (Three Bond 1211) on the housing.

-6-
Fig. 11 • Reassembly of housing (A).(B) set (2) Fit the Hammer Case [7] in housing (A) securely.
Hammer Case [7]
Protrusion (for locking)
Fit the protrusion of housing (A) in the notch
of the Motor DC 12 V [23] (for locking).
Fit the protrusion of the Hammer Case [7] (for
locking) in the concave portion of housing (A).
Fig. 12 • Mounting the guide sleeve
4. Mounting the exterior parts
Cover the assembled housing with the Front Cap [6].
5. Mounting the guide sleeve
Insert one Steel Ball D3.175 [8] into the hole of the Anvil
[9]. Mount Guide Sleeve (C) [5], Guide Spring (C) [4] and
Washer (F) [3] in sequence. Mount the Retaining Ring [2]
into the groove of the anvil using J-339 jigs (E) and (F) for
retaining rings.
NOTE: Be sure to replace the Retaining Ring [2] with
a new one because it may be deformed and
Guide Sleeve (C) [5] could come off if the
deformed Retaining Ring [2] is used again.
Push down.
J-339 jig (E)
for retaining rings
Retaining Ring [2]
Washer (F) [3] J-339 jig (F)
for retaining rings

-7-
ATTOLUB MS No. 2
• Pinion tooth flanks of the Motor DC 12 V [23], Ring Gear [21] and Idle Gear [17]
HITACHI MOTOR GREASE No. 29
• One Steel Ball D3.175 [8]
• Sliding section between the Anvil [9] and Guide Sleeve (C) [5]
MOLUB-ALLOY 777-1
• 8 mm diameter hole of the Anvil [9], sliding section between the Anvil [9] and the metal, oil groove,
and upper surface of the claw
• Two Steel Balls D5.556 [10]
• Cam groove, oil groove and claw of the Hammer [11]
• Cam groove and sliding section of the Spindle [16]
• 5 mm diameter hole of Idle Gear [17]
• All around Needle (C) [18]
• Twenty-eight Steel Balls D3.175 [8]
• Tapping Screw (W/Flange) D3 x 16 (Black) [35] ---------------------------- 1.5 ± 0.4 N•m (15 ± 4 kgf•cm)
Check the following after reassembly:
(1) Confirm that the switching operation is smooth and the Model WH 10DAL can start, stop, change
speed and perform forward/reverse operation reliably.
(2) Confirm that the LED light goes on when the switch is turned on.
(3) Confirm that the rotation direction of the anvil coincides with the push-on side of pushing button (A).
(When pushing button (A) is turned to the (R) side, the rotation direction of the anvil should be
clockwise as viewed from behind.)
No-load current: 4.0 ± 1 A (DC 12.2 V [equivalent to the voltage of a fully charged battery])
2. Precautions on disassembly and reassembly of the battery charger
Refer to the Service Manual for precautions on disassembly and reassembly of the Model UC 10SL2
charger.
Application of lubricant
Screw tightening torque
Checking after reassembly
No-load current

-8-
MODEL Variable
Fixed 10 20 30 40 50 60 min.
WH 10DAL
General assembly
Switch
Terminal
Set
Motor
DC 12 V
Hammer
Case
Anvil
Ring Gear
Housing
(A).(B) Set
Hammer
Steel Ball
D5.556
Hammer
Spring (E)
Spindle
Idle Gear
Needle (C)
Ball Bearing
(6803VV)
Work Flow
Guide
Sleeve
Ass’y
STANDARD REPAIR TIME (UNIT) SCHEDULES

Model WH 10DAL
CORDLESS IMPACT DRIVER
LIST NO. J882
2014·6·26
(E1)
16
501 502 503
234
5
6
7
8910
20
21
22
27
28
29
30
33
34
35
32
24
11 8
12
13
14 15
17
18
19
1
26
504
36
31
31
23
25

PART
S
WH 10DAL
DESCRIPTION REMARKS
1 329538 GUIDE SLEEVE ASS'Y 1 INCLUD.2-5,8
2 995933 RETAINING RING 1
3 331959 WASHER (F) 1
4 322737 GUIDE SPRING (C) 1
5 329537 GUIDE SLEEVE (C) 1
6 337360 FRONT CAP 1
7 330955 HAMMER CASE 1
8 959148 STEEL BALL D3.175 (10 PCS.) 29
*9 329554 ANVIL (L) 1
*9 329555 ANVIL (S) 1 FOR EUROPE,RUS,NZL,TUR,ISR,SAF
10 959154 STEEL BALL D5.556 (10 PCS.) 2
11 330965 HAMMER 1
12 315978 WASHER (J) 1
13 322741 HAMMER SPRING (E) 1
14 316172 WASHER (S) 1
15 322740 STOPPER (A) 1
16 330960 SPINDLE 1
17 330958 IDLE GEAR 2
18 980258 NEEDLE (C) 2
19 330961 WASHER (G) 1
20 330962 BALL BEARING 6803VV 1
21 331019 RING GEAR 1
22 331448 PACKING (A) 1
23 337361 MOTOR DC 12V 1 INCLUD.25
*24 331449 INTERNAL WIRE (C) 1 EXCEPT FOR EUROPE,RUS,TUR
25 987105 O-RING (S-10) 1
*26 306041 INTERNAL WIRE (B) (BLACK) 1 EXCEPT FOR EUROPE,RUS,TUR
*27 337357 TRUSS HD. SCREW M4 (BLACK) 1 FOR EUROPE
*28 337362 HOOK (A) ASS'Y 1 INCLUD.27 FOR EUROPE
29 337355 HOUSING (A).(B) SET 1 INCLUD.31
*30 334866 INTERNAL WIRE FERRITE SET 1 FOR EUROPE,RUS,TUR
31 327002 LOCK NUT M4 (BLACK) 2
32 329548 PUSHING BUTTON (A) 1
33 337359 SWITCH TERMINAL SET 1
34 NAME PLATE 1
35 313687 TAPPING SCREW (W/FLANGE) D3 X 16 (BLACK) 8
*36 331067 BATTERY BCL 1015 (EUROPE,AUS,NZL) 2 INCLUD.504
*36 331069 BATTERY BCL 1015 (CHN) 2 INCLUD.504
*36 331068 BATTERY BCL 1015 (TPE) 2 INCLUD.504
*36 337391 BATTERY BCL 1015 (THA) 2 INCLUD.504
- 2 - 6 - 14*ALTERNATIVE PARTS
ITEM
NO. NO. USED
CODE NO.

WH 10DAL
DESCRIPTION REMARKS
* 501 983006 + DRIVER BIT NO.2 65L 1
* 501 992671 + DRIVER BIT (B) NO.2 50L 1 FOR EUROPE,RUS,NZL,TUR,ISR,SAF
502 CHARGER (MODEL UC 10SL2) 1
503 336642 CASE 1
504 331086 BATTERY COVER 1
DESCRIPTION REMARKS
* 601 337362 HOOK (A) ASS'Y 1 INCLUD.602 EXCEPT FOR EUROPE
* 602 337357 TRUSS HD. SCREW M4 (BLACK) 1 EXCEPT FOR EUROPE
603 306927 SILICONE RUBBER 1
604 996184 BIT PIECE 1
* 605 337384 BATTERY BCL 1030 (EUROPE) 1 INCLUD.504 FOR EUROPE,RUS,NZL
6 - 14 Printed in Japan - 3 -
(140626N)
*ALTERNATIVE PARTS
STANDARD ACCESSORIES
OPTIONAL ACCESSORIES
NO.
USED
CODE NO.
ITEM
NO.
NO.
USED
CODE NO.
ITEM
NO.