Hitachi Koki WH 18DD Manual de usuario

PRODUCT NAME

18 V Cordless Impact Driver

Models WH 18DD, WH 18DDX

WH 18DDX: For the UK

WH 18DD: For other regions

REPAIR GUIDE ---------------------------------------------------------------------------------------------------------------- 1

1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1

• Disassembly ---------------------------------------------------------------------------------------------------- 1

• Reassembly ---------------------------------------------------------------------------------------------------- 4

• Type of silicone rubber --------------------------------------------------------------------------------------- 8

• Lubrication points and type of lubricant ------------------------------------------------------------------ 8

• Tightening torque ---------------------------------------------------------------------------------------------- 9

• Checking after reassembly --------------------------------------------------------------------------------- 9

• No-load current ------------------------------------------------------------------------------------------------ 9

• Wiring diagram ----------------------------------------------------------------------------------------------- 10

2. Precautions on disassembly and reassembly of the charger -------------------------------------- 10

CONTENTS Page

Power Tools Service Manual

CONFIDENTIAL

Jul. 2020

Overseas Sales Management Dept.

WH 18DD

-1-

• Removal of the guide sleeve

WARNING: Always remove the 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 the item numbers in the parts lists and exploded

assembly diagrams for the Models WH 18DD and WH 18DDX.

1. Removal of the guide sleeve

Remove the Retaining Ring [2], Washer (D) [3], Guide Spring (D) [4], and Guide Sleeve (D) [5] in this

order with a small flat-blade screwdriver. Do not work too quickly. Be careful not to let the Retaining Ring

[2] pop up, and do not lose the two Steel Balls D3.5 [9] in the opening of the Anvil [10].

Disassembly

REPAIR GUIDE

Opening of the

Retaining Ring [2]

[2]

Insert the edge of a small flat-blade screwdriver

under the end of the Retaining Ring [2].

Secure the body and align the opening of the

Retaining Ring [2] with the notch on the Anvil [10].

Slowly raise the Retaining

Ring [2] from the end to

remove it from the Anvil [10].

Hold Washer (D) [3] and Guide Spring (D)

[4] with fingers to prevent them from popping

up together with the Retaining Ring [2].

[10]

[3]

[2]

[5]

[2]

[5]

[2]

[3]

[4]

[10]

Notch on the Anvil [10]

-2-

• Disassembly of the hammer assembly

J-297 base for washer (S)

(special-purpose tool)

Highest point of the cam

groove in the Spindle [18]

Steel ball insertion groove

[18]

[15]

[17]

[16]

[12]

[18]

[11]

2. Removal of the exterior parts

Insert the edge of a small flat-blade screwdriver into the space between the Front Cap [6] and the Hammer

Case [7], and remove the Front Cap [6] from the Hammer Case [7].

3. Removal of housing (A).(B) set

(1) Remove the nine Tapping Screws (W/Flange) D3 x 16 [27] to remove housing (B) of Housing (A).(B)

Set [33].

(2) Remove the Hammer Case [7], hammer assembly, Inner Cover [26], and Wiring Ass’y [29] together as

one unit. Remove the Pushing Button [30].

4. Disassembly of the hammer assembly

(1) Set the hammer assembly detached from the Hammer Case [7] on the J-297 base for washer (S)

(special-purpose tool, Code No. 317063). Push down the end of the Spindle [18] with a hand press or

similar tool to compress the Hammer Spring [15], and then use a small flat-blade screwdriver or similar

tool to take out Stopper (A) [17] in this state. Release the hand press.

(2) Remove the hammer assembly from the J-297 base for washer (S). Hold the end surface of the

Spindle [18]. Then push down either of the tabs on the Hammer [12] with a hand press or similar tool

to compress the Hammer Spring [15]. In this state, use a small flat-blade screwdriver or similar tool to

remove the two Steel Balls D5.556 [11] from the cam groove in the Spindle [18] and Hammer [12].

(3) Release the hand press, hold the Hammer [12] and Washer (S) [16] together, and then pull both out

from the Spindle [18]. You can now take out the Hammer Spring [15].

Press down.

Tab on the Hammer [12]

-3-

5. Removal of the inner cover

Detach Ring Gear (A) [23] and O-ring [24] from the Inner Cover [26], and then use a small flat-blade

screwdriver to remove Damper (A) [25].

NOTE: Be careful not to damage the O-ring [24].

• Removal of the inner cover

[23]

[24]

[21]

[25]

[26]

[22]

-4-

• Reassembly of the power supply unit and its vicinity

Generally, perform reassembly by reversing the disassembly procedure. However, special attention should

be given to the following items.

1. Reassembly of the power supply unit and its vicinity

Reassembly

[30]

Fit the protrusion of the direction

selector lever of the switch into the

hole of the Pushing Button [30].

Insert the brown internal wire into the

internal wire threading groove first, then

insert the orange internal wire, blue

internal wire, and purple internal wire

into the internal wire threading groove.

Insert the tip (connector) of the D wire

(blue) into the space in the housing.

NOTE: The D wire is intended for

exterior communication so

that the supplier can check

the controller status.

LED

-5-

2. Mounting the mechanical parts

(1) Mount Washer (S) [16] to the Spindle [18]. Put the twenty-eight Steel Balls D3.175 [13], Washer (J)

[14], and Hammer Spring [15] in the Hammer [12], and mount it to the Spindle [18].

(2) Align the highest point of the cam groove in the Spindle [18] with the steel ball insertion groove in the

Hammer [12]. Push down the tabs on the Hammer [12] with a hand press or similar tool to compress

the Hammer Spring [15] until it contacts the Spindle [18] and hold it there.

(3) Insert the two Steel Balls D5.556 [11] into the steel ball insertion groove. Check that the two Steel Balls

D5.556 [11] are in the groove, and then loosen the hand press.

(4) Set the hammer assembly onto the J-297 base for washer (S) (special-purpose tool, Code No.

317063), press the hand press down on the edge of the Spindle [18] to compress the Hammer Spring

[15], and then mount Stopper (A) [17] to the Spindle [18]. Loosen the hand press to complete the

procedure.

(5) Mount the Idle Gear Set (2 pcs.) [19] and two Needle Rollers (A) [20] to the Spindle [18] and insert

Washer (E) [21] to assemble the hammer assembly.

(6) Press-fit the Ball Bearing 6901VV [22] into the Inner Cover [26] and fit two Dampers (A) [25] into the

Inner Cover [26]. Then fit the O-ring [24] into Ring Gear (A) [23], and fit the retaining rib of Ring Gear

(A) [23] into the concave portion of Damper (A) [25].

(7) Check the hammer assembly (whether Washer (E) [21] is inserted into the Spindle [18]) for proper

engagement of the Idle Gear Set [19] with Ring Gear (A) [23], and mount it to the Inner Cover [26].

(8) Insert the Anvil [10] into the tip of the Spindle [18] of the hammer assembly, and then cover it with the

Hammer Case [7].

NOTE: At that time, make sure that the ribs of the Inner Cover [26] are positioned at 90° relative

to the retaining tabs of the Hammer Case [7].

(9) Press-fit the Wiring Ass’y [29] all the way into the Inner Cover [26]. Make sure that the Wiring Ass’y

[29] turns smoothly. If the Wiring Ass’y [29] does not turn smoothly, its gears could be improperly

engaged. In such a case, mount the Wiring Ass’y [29] properly.

90°

Retaining tabs of the Hammer Case [7]

• Mounting the mechanical parts

Ribs of the Inner Cover [26]

-6-

pply silicone rubber (Three Bond TB1211) to the shaded areas.

• Application of silicone rubber

3. Reassembly of housing (A).(B) set

(1) Before mounting the parts to housing (A), apply silicone rubber (Three Bond TB1211) to the specified

locations shown in the figure below.

(2) Integrate the hammer assembly, Hammer Case [7], Inner Cover [26], Wiring Ass’y [29] (including the

DC-speed control switch and controller), and Battery Terminal [32] as one unit, and then mount the unit

to housing (A).

NOTE: • Fit the Hammer Case [7] into the housing so that the retaining tab of the Hammer Case

[7] is in contact with the retainer receptor of the housing as shown in the figure below.

• Check whether the Hammer Case [7] is properly inserted into the housing. If the

Hammer Case [7] does not fit into the specified groove of the housing, or if the ribs of

the Inner Cover [26] are not positioned at 90° relative to the retaining tabs of the

Hammer Case [7], reassemble it. The Models WH 18DD and WH 18DDX are structured

so that the Hammer Case [7] will retain the parts axially when properly assembled.

Therefore, make sure that the parts are properly mounted to the housing.

(3) Also coat housing (B) with silicone rubber (Three Bond TB1211) at the similar location. Mount housing

(B) and fasten the nine Tapping Screws (W/Flange) D3 x 16 [27].

NOTE: Use a cloth to wipe off any silicone rubber adhering to the outer circumference of the

housing.

-7-

Make sure the Hammer Case [7]

is securely fitted to housing (A).

Retaining tabs

• Mounting the hammer case

Make the retaining tabs of the Hammer Case [7]

touch housing (A) here.

-8-

• Mounting the guide sleeve

4. Mounting the exterior parts

Mount the Front Cap [6] to the Hammer Case [7].

5. Mounting the guide sleeve

Put the two Steel Balls D3.5 [9] into the Anvil [10]. Mount

Guide Sleeve (D) [5], Guide Spring (D) [4], and Washer (D)

[3] in this order. Use the J-295 jigs (A) and (B) for retaining

ring (special-purpose tools, Code No. 317060 and 317061) to

mount the Retaining Ring [2] in the groove of the Anvil [10].

NOTE: The Retaining Ring [2] may be deformed in the

disassembly procedure and Guide Sleeve (D) [5]

may come off if the deformed Retaining Ring [2]

is reused. Be sure to replace the Retaining Ring

[2] with a new one.

Please purchase the following silicone rubber as necessary.

Item Registered part name Net weight Code No.

Three Bond 1211 Silicone rubber 100 g 306927

Apply specified amount of grease to the following portions.

MOLUB-ALLOY 777-1

• Convex portion (8 mm in dia.) on the Anvil [10]

• Sliding portion between the Anvil [10] and the needle bearing

• Two Steel Balls D5.556 [11]

• Cam groove, oiled groove, and tabs on the Hammer [12]

• Cam groove and sliding portion of the Spindle [18]

• Hole (5 mm in dia.) in the Idle Gear Set (2 pcs.) [19]

• Entire circumference of Needle Roller (A) [20]

• Twenty-eight Steel Balls D3.175 [13]

• Top surface of the tabs on the Anvil [10] and sliding portion of Washer (F) [8]

• Inner circumference of the needle bearing of the Hammer Case [7]

Lubrication points and type of lubricant

Press down here.

[2]

[3]

J-295 jig (B) for retaining ring

(special-purpose tool)

J-295 jig (A) for retaining ring

(special-purpose tool)

Type of silicone rubber

-9-

NIPPECO SEP-3A

• Two Steel Balls D3.5 [9]

• Sliding portion of the Anvil [10] and Guide Sleeve (D) [5]

• Press-fitting portion (rotor side) of the Inner Cover [26]

ATTOLUB MS NO. 2

• Toothed surfaces of the Wiring Ass’y [29] pinions, toothed surface of Ring Gear (A) [23], and

toothed part of the Idle Gear Set [19].

Please purchase the following grease as necessary.

Item Registered part name Net weight Code No.

MOLUB-ALLOY 777-1 Grease (Molub-Alloy No. 777-1) 75 g 75 g 325149

NIPPECO SEP-3A

Grease (SEP-3A) (100 g) 100 g 930035

Grease (SEP-3A) (2.5 kg) 2.5 kg 930038

ATTOLUB MS NO. 2 Grease (Attolub MS No. 2) 500 g 500 g 302922

Item

No. Part name No.

used

Tightening torque

N•m kgf•cm

[27] Tapping Screws (W/Flange) D3 x 16 (Black) 9 1.3±0.3 13±3

After reassembly, check the following.

(1) Check that the Models WH 18DD and WH 18DDX run smoothly and start, stop, change speed, and

change direction securely.

(2) Check that the rotating direction of the Anvil [10] matches that of the pushed side of the Pushing Button

[30].

No-load current: 2.3±1.0 A (DC 19.8 V—equivalent to the voltage of a fully charged battery)

Tightening torque

Checking after reassembly

No-load current

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