Hitachi WH 14DY Technical Data And Service Manualice Manual

Brand: Hitachi

Model: WH 14DY

Category: Cordless combi drills

Type: Technical Data And Service Manualice Manual

This manual is also suitable for

WH 14DCAL

[ NEW FEATURES ]

Compact body

Newly structured paddle lever

PRODUCT NAME

Hitachi 14.4 V Cordless Angle Impact Driver

Models WH 14DCAL, WH 14DY

LIST No.

WH 14DCAL: H821

WH 14DY: H822

Aug. 2008

The new Models WH 14DCAL and WH 14DY are compact and cordless angle impact drivers equipped with the

14.4-V battery (Model WH 14DCAL: lithium-ion battery). Features of the Models WH 14DCAL and WH 14D

include the following.

(1) Compact body (smallest center height in its class: 16.5 mm)

(2) Newly structured paddle lever is very convenient.

With the new Models WH 14DCAL and WH 14DY, we aim to expand our market share.

• Tightening/loosening of small screws, tapping screws, wood screws, Teks screws, Hex screws, etc.

• Tightening/loosening of bolts, nuts, etc.

• Drilling into wood and various other materials (with use of the optional accessory drill chuck and adapter set)

WH 14DCAL

International Sales Division

MARKETING OBJECTIVE

APPLICATIONS

SELLING POINTS

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

REMARK:

For more information about HANDLING INSTRUCTIONS, visit our website at:

http://www.hitachi-koki.com/manual_view_export/

Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(are) used in the place of

company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here is(are) as follows:

Competitors

Symbols Utilized

Company Name Model Name

B MAKITA 6940DWA

M MAKITA TL060DRF

CONTENTS

Page

SELLING POINT DESCRIPTIONS ----------------------------------------------------------------------------------------- 1

SPECIFICATIONS -------------------------------------------------------------------------------------------------------------- 2

1. Specifications------------------------------------------------------------------------------------------------------ 2

2. Optional accessories --------------------------------------------------------------------------------------------4

COMPARISONS WITH SIMILAR PRODUCTS-------------------------------------------------------------------------- 5

1. Specification comparisons ------------------------------------------------------------------------------------- 5

2. Tightening torque------------------------------------------------------------------------------------------------- 6

3. Tightening time and number of screws tightened -------------------------------------------------------- 8

PRECAUTIONS IN SALES PROMOTION-------------------------------------------------------------------------------- 9

1. Safety instructions ----------------------------------------------------------------------------------------------- 9

2. Tightening torque inspection prior to operation --------------------------------------------------------- 11

3. Tightening torque variation----------------------------------------------------------------------------------- 11

4. Precautions for efficient use of charger and battery --------------------------------------------------- 12

5. Other precautions ---------------------------------------------------------------------------------------------- 13

REPAIR GUIDE---------------------------------------------------------------------------------------------------------------- 14

1. Precautions in disassembly and reassembly------------------------------------------------------------ 14

2. Precautions in disassembly and reassembly of battery charger------------------------------------ 22

STANDARD REPAIR TIME (UNIT) SCHEDULES-------------------------------------------------------------------- 23

Assembly diagram for WH 14DCAL

Assembly diagram for WH 14DY

-1-

Convenient for tightening screws and bolts in narrow places

Compact body

The Models WH 14DCAL and WH 14DY are compact and easy to handle. They are also convenient for

operation in narrow places.

HITACHI

Model

WH 14DCAL WH 14DY

Overall length

392

370 387

Center height

16.5

17.5 18

Newly structured paddle lever

Each of the Models WH 14DCAL and WH 14DY is equipped with the newly structured paddle lever for

easier operation.

SELLING POINT DESCRIPTIONS

Thanks to the paddle lever, triggering (speed

change) operation can be done reliably even

by holding the upper portion, base portion o

any other portion of the housing.

The lock button prevents imprope

operation of the switch for safety.

-2-

1. Specifications

Model WH 14DCAL

Capacity

Small screw : 4 to 8 mm (5/32” to 5/16”)

Ordinary bolt : M4 to M10 (5/32” to 25/64”)

High-strength bolt : M4 to M8 (5/32” to 5/16”)

Tightening torque*

50 N•m (510 kgf•cm 440 in-lbs.)

Tip condition 6.35 mm (1/4”) bit holder

Type of motor Fan cooled DC magnet motor

Main body

Glassfiber reinforced polyamide resin (black)-------Housing

Aluminum alloy die casting----------------------Hammer case

Battery Polycarbonate resin

Enclosure

Charger ABS resin

Type of switch

Trigger switch with forward/reverse changeover pushing button (with brake)

No-load rotation speed 0 to 2,100 min

-1

Impact rate 0 to 3,200 min

-1

Net

Main body (including Type BCL 1430 battery) ------1.6 kg (3.5 lbs.)

Battery -------------------------------------0.5 kg (1.1 lbs.)

Charger unit (including cord)

--------------------0.6 kg (1.3 lbs.)

Weight

Gross

WH 14DCAL (2LRK): 4.2 kg (9.3 lbs.) WH 14DCAL (NN): 1.3 kg (2.9 lbs.)

Overall length x Head height 392 mm (15-7/16”) x 53 mm (2-5/64”)

Center height 16.5 mm (21/32”)

Type of battery Sealed cylindrical lithium-ion storage battery

Nominal voltage DC 14.4 V

Nominal life Charging/discharging: approximately 1,500 times

Battery

(Type

BCL 1430)

Nominal capacity 3.0 Ah

Charger

(Model UC 18YRL)

• Overcharge protection system:

(1) Battery voltage detection (-ΔV system)

Battery temperature detection (dT/dt system) for Ni-MH and SUPER

Ni-MH batteries

(2) Battery surface temperature detection (thermistor)

(3) 120-minute timer

(4) Stop current detection (Li-ion batteries)

• Power input: 95 W

•

Charging time: Approx. 45 minutes [for Type BCL 1430 battery at 20

°C

(68

°C

)]

• Operable ambient temperature range: 0

°C

to 40

°C

(32°F to 104°F)

The maximum allowable temperature of the Type BCL 1430 battery is

50 °C (122 °F).

Indication method of battery charging function

NOTE: The Model UC 18YRL cools the overheated battery by the cooling fan

during the standby mode.

Standard

accessories

(2LRK)

Charger (Model UC 18YRL)----------------------------------- 1

Battery (Type BCL 1430)

------------------------------------- 1

Case

----------------------------------------------------- 1

*1: This torque is based on tightening an M10 (25/64”) bolt (strength grade: 12.9) for 3 seconds with a

hexagon socket.

SPECIFICATIONS

-3-

Model WH 14DY

Capacity

Small screw : 4 to 8 mm (5/32” to 5/16”)

Ordinary bolt : M4 to M10 (5/32” to 25/64”)

High-strength bolt : M4 to M8 (5/32” to 5/16”)

Tightening torque*

50 N•m (510 kgf•cm 440 in-lbs.)

Tip condition 6.35 mm (1/4”) bit holder

Type of motor Fan cooled DC magnet motor

Main body

Glassfiber reinforced polyamide resin (black)-------Housing

Aluminum alloy die casting

----------------------Hammer case

Battery Polycarbonate resin

Enclosure

Charger ABS resin

Type of switch

Trigger switch with forward/reverse changeover pushing button (with brake)

No-load rotation speed 0 to 2,100 min

-1

Impact rate 0 to 3,200 min

-1

Net

Main body (including Type EB 14B battery) --------1.9 kg (4.2 lbs.)

Battery

-------------------------------------0.8 kg (1.7 lbs.)

Charger unit (including cord)

-------------------0.3 kg (0.6 lbs.)

Weight

Gross

WH 14DY (2BGK): 4.6 kg (10.1 lbs.) WH 14DY (NN): 1.3 kg (2.9 lbs.)

Overall length x Head height 392 mm (15-7/16”) x 53 mm (2-5/64”)

Center height 16.5 mm (21/32”)

Type of battery Sealed cylindrical Ni-Cd storage battery

Nominal voltage DC 14.4 V

Nominal life Charging/discharging: approximately 1,000 times

Battery

(Type

EB 14B)

Nominal capacity 2.0 Ah

Charger

(Model UC 18YG)

• Overcharge prevention circuit:

A thermostat monitors the surface temperature of the battery and, on

detecting the temperature rise which occurs on completion of charging,

automatically turns off the unit to prevent the battery from overcharge.

• Output capacity: 70 W

• Indication method: Pilot lamp indicator of battery charging

• Function: On

-------------------------------During charging

Off

-------------------------------Charging completed

Standard

accessories

(2BGK)

Charger (Model UC 18YG)------------------------------------ 1

Battery (Type EB 14B)

--------------------------------------- 2

Case

----------------------------------------------------- 1

*1: This torque is based on tightening an M10 (25/64”) bolt (strength grade: 12.9) for 3 seconds with a

hexagon socket.

-4-

2. Optional accessories

(1) Plus driver bit

Bit No. Code No.

No. 2 992671

No. 3 992672

(2) Hexagon socket

Part name Stamped figures Code No. L (mm) B (mm)

4 mm hexagon socket 7 992689 65 (2-9/16”) 7 (1/4”)

5 mm hexagon socket 8 996177 65 (2-9/16”) 8 (5/16”)

6 mm hexagon socket 10 985329 65 (2-9/16”) 10 (3/8”)

5/16” hexagon socket 12 996178 65 (2-9/16”) 12 (15/32”)

8 mm hexagon socket 13 996179 65 (2-9/16”) 13 (1/2”)

10 mm hexagon socket (small type) 14 996180 65 (2-9/16”) 14 (9/16”)

10 mm hexagon socket 16 996181 65 (2-9/16”) 16 (5/8”)

10 mm hexagon socket 17 996182 65 (2-9/16”) 17 (21/32”)

(3) Drill chuck adaptor set (Code No. 321823)

The drill chuck adaptor set permits mounting of various types of locally-available drill for a variety of

drilling operations.

Stamped figures

-5-

1. Specification comparisons (Superior specifications:

)

HITACHI

Maker

Model

Item

WH 14DCAL

(2LRK)

WH 14DY

(2BGK)

B M

Voltage 14.4 9.6 14.4

Small screw mm

4 to 8

(5/32” to 5/16”)

4 to 8

(5/32” to 5/16”)

4 to 8

(5/32” to 5/16”)

Ordinary bolt

M4 to M10

(5/32” to 3/8”)

M5 to M12

(3/16” to 15/32”)

M4 to M12

(5/32” to 15/32”)

Capacity

High-strength bolt

M4 to M8

(5/32’’ to 5/16”)

M5 to M10

(3/16” to 3/8”)

M4 to M8

(5/32” to 5/16”)

Max. tightening torque

{actually measured value}

•m

50 (440 in-lbs)

{65 (575 in-lbs)}

29.4 (260 in-lbs)

{60 (531 in-lbs)}

60 (530 in-lbs)

{61 (539 in-lbs)}

No-load speed min

-1

0 to 2,100 0 to 2,000 0 to 2,000

Impact rate min

-1

0 to 3,200 0 to 2,700 0 to 3,000

Main body weight kg

1.6 (3.5 lbs.) 1.9 (4.2 lbs.) 1.5 (3.3 lbs.)

1.6 (3.5 lbs.)

Overall length mm 392 (15-7/16”) 370 (14-5/8”) 387 (15-15/64”)

Head height mm 53 (2-5/64”) 60 (2-23/64”) 53 (2-5/64”)

Center height mm 16.5 (21/32”) 17.5 (11/16”) 18 (45/64”)

Type of switch Paddle lever Paddle lever Trigger

LED light Not provided Not provided Provided

Type Li-ion Ni-Cd Ni-Cd Li-ion

Nominal capacity 3.0 2.0 2.0

3.0

Battery

Charging time 45 50 60

Standard accessories

Charger

Case

Charger

Case

Plus bit

Charger

Case

Plus bit

COMPARISONS WITH SIMILAR PRODUCTS

-6-

2. Tightening torque

(1) Diameter of thread and appropriate tightening torque

Generally speaking, the appropriate tightening torque for a screw can be determined by the strength

grade of the screw and the material tightened. The tables below list data relative to the strength grade of

various screws and the appropriate tightening torque. For further reference, appropriate tightening

torque is calculated with the following formula. Study and use this formula for accurate selection of

tightening torque.

T = k • d • p

T: Appropriate tightening torque (kgf•cm)

d: Nominal diameter of thread (mm)

p: Recommended axial tightening force to be applied to the screw (kgf)

p = Rated axial stress (kgf/cm

) x 0.8 x Effective sectional area of the thread (mm

)

k: Torque coefficient (0.17)

• Strength grade and rated axial stress of thread

Strength grade 4.8 6.8 8.8 12.9

Rated axial stress (kgf/mm

)

29.1 43.7 58.2 95

Material Mild steel Alloy steel including Ni, Mn, Cr, etc.

Heat treatment Not processed Precessed: Hard material

• Diameter and effective sectional area of thread

Kind of thread (x pitch)

M5 x 0.8 mm

(3/16”)

M6 x 1 mm

(1/4”)

M8 x 1.25 mm

(5/16”)

M10 x 1.5 mm

(3/18”)

M12 x 1.75 mm

(15/32”)

Effective section area

of thread (mm

)

14.2 20.1 36.6 58.0 84.3

• Diameter of thread and appropriate tightening torque

-7-

(2) Bolt tightening torque characteristics

The graphs below show the relationship between tightening time and tightening torque according to

types of bolts. The data below are intended for reference purposes only because actual tightening

torque may vary depending on tightening conditions. For details, please refer to "Tightening torque

variation."

NOTE:

•

The term "tightening time" means the impact time after the lower surface of the bolt comes in contact

with the material into which it is being tightened.

• Each bolt is tightened directly into a steel plate under the following tightening conditions.

Accordingly, the torque goes up very abruptly in comparison with the ordinary bolt tightening

conditions.

* The following bolts were used:

Ordinary bolt: Strength grade 4.8

High-strength bolt: Strength grade 12.9

Strength grade is read as follows.

4.8

Yield point or durable force:

(45,500 psi)

Tensile strength of the bolt:

(56,900 psi)

-8-

3. Tightening time and number of screws tightened

(1) Screw tightening time

The table below shows a comparison of the screw tightening time between the Model WH 14DCAL/

WH 14DY and competitors. Please note that the data below are intended for reference purposes only

because the actual tightening time may vary depending on hardness of workpieces, ambient

temperature, characteristics of the battery, etc.

Wood screw 4.0 mm in dia. and 50 mm in length, lauan

←

Fast Slow

→

Maker • Model

1 2 3 4 5 6 7 8 9 10 (sec.)

HITACHI WH 14DCAL

3.0

HITACHI WH 14DY

3.0

3.2

3.6

(2) Per-charge working capacity comparisons

The table below shows a comparison of the number of screws that can be tightened per battery charge

between the Model WH 14DCAL/WH 14DY and competitors. Please note that the data below are

intended for reference purposes only because the number of screws that can be tightened per charge

may vary depending on screw tightening conditions, screw size, ambient temperature, characteristics of

the battery, etc.

Number of screws that can be tightened per charge

HITACHIMaker

Model

Tightening condition

WH 14DCAL WH 14DY

B M

Battery 3.0 Ah 2.0 Ah 2.0 Ah 3.0 Ah

Wood screw 4.0 mm in dia.

and 50 mm in length, lauan

380 270 170 340

-9-

1. Safety instructions

In the interest of promoting the safest and most efficient use of the Model WH 14DCAL/WH 14DY cordless

angle impact driver drill by all of our customers, it is very important that at the time of sale, the salesperson

carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling

Instructions, and fully understands the meaning of the precautions listed on the Caution Plate and the

Name Plate attached to each tool.

A. Handling instructions

Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to give

pertinent advice to the customer. In particular, they must have a thorough understanding of the precautions

for use of the cordless tools which are different from those of ordinary electric power tools.

(1) Before use, ensure that the battery is fully charged.

New battery is not fully charged. Even if the battery was fully charged at the factory, long periods of

inactivity, such as during shipping, cause the storage battery to lose its charge. Customers must be

instructed to fully charge the battery prior to use.

(2) Connect the charger to an AC power outlet only.

Use of any other power source (DC outlet, fuel powered generator, etc.) will cause the charger to

overheat and burn out.

(3) Do not use any voltage increasing equipment (transformer etc.) between the power source and

the charger.

If the charger is used with voltage higher than that indicated on the unit, it will not function properly.

(4) Conduct battery charging at an ambient temperature range of 0° to 50°C (32°F to 122°F).

Special temperature sensitive devices are employed in the charger to permit rapid charging. Ensure that

customers are instructed to use the charger at the indicated ambient temperature range. At temperature

under 0°C (32°F) the thermostat will not function properly, and the storage battery may be overcharged.

At temperature over 40°C (104°F), the storage battery cannot be sufficiently charged. The optimum

temperature range is 20°C to 25°C (68°F to 77°F).

(5) The battery charger should not be used continuously.

At high ambient temperature, if over three storage batteries are charged in succession, the temperature

of the coils on the transformer will rise and there is a chance that the temperature fuse inserted in the

interior of the transformer will inadvertently melt. After charging one battery, please wait about 15

minutes before charging the next battery.

(6) Do not insert foreign objects into the air vents on the charger.

The charger case is equipped with air vents to protect the internal electronic components from

overheating. Caution the customer not to allow foreign materials, such as metallic or flammable objects,

to be dropped or inserted into the air vents. This could cause electrical shock, fire, or other serious

hazards.

(7) Do not attempt to disassemble the storage battery or the charger.

Special devices, such as a thermostat, are built into the storage battery and the charger to permit rapid

charging. Incorrect parts replacement and/or wiring will cause malfunctions which could result in fire or

other hazards. Instruct the customer to bring these units to an authorized service center in the event

repair or replacement is necessary.

PRECAUTIONS IN SALES PROMOTION

-10-

CAUTION

•Read thoroughly HANDLING INSTRUCTIONS before use.

•Do not disassemble nor throw into fire.

CAUTION

•For safe operation, see Instruction manual.

•Risk of fire, burn or explosion.

For use only with UC 18YFL, UC 18YRL charger.

Do not crush, disassemble, or dispose of in fire.

●For safe operation, see instruction manual.

●Charge HITACHI rechargeable batteries types EB 7, EB 9, EB 12,

EB 14, EB 18, BCL 14, BCL 18, EBM 18 series. Other types of batteries may burst

causing personal injury and damage.

●Charge between 32°F and 104°F. Rest 15

minutes between the charging of batteries.

●Indoor use only. ●Replace defective

cord immediately.

●POUR UTILISATION A L’INTERIEUR SEULEMENT.

●UTILISER POUR CHARGER UNIQUEMENT LES

ACCUMULATEURS HITACHI DU TYPES EB 7, EB 9, EB 12, EB 14, EB 18, BCL 14,

BCL 18, EBM 18 SERIES. D’AUTRES TYPES D’ACCUMULATEURS POURRAIENT

ECLATER ET CAUSER DES BLESSURES OU DOMMAGES.

CAUTION

AVERTISSEMENT

ATTENTION

WARNING

•To reduce the risk of injury, user must read and understand instruction manual.

•Risk of fire, burn or explosion. For use only with BCL 1430 battery.

AVERTISSEMENT

•Afin de réduire le risque de blessures, l'utilisateur doit lire

et bien com

rendre le mode d'em

loi.

(8) Disposal of the storage batteries

Ensure that all customers understand that the storage batteries should be returned to the Hitachi power

tool sales outlet or the authorized service center when they are no longer capable of being recharged or

repaired. If thrown into a fire, the batteries may explode.

B. Caution plate

(1) The following cautions are listed on the Name Plate attached to the main body of each tool.

[For the U.S.A. and Canada]

(2) The following cautions are listed on the Name Plate attached to each sorage battery.

[For Europe]

[For the U.S.A. and Canada]

(3) The following cautions are listed on the Name Plate attached to the Model UC 18YRL charger.

[For the U.S.A and Canada]

-11-

2. Tightening torque inspection prior to operation

As described and shown in page 7, the output tightening torque of the Models WH 14DCAL and WH 14DY

may exceed the rated tightening torque of certain bolts and screws. Accordingly, if the tightening time is

prolonged for such bolts and screws, the screws or the bolts may be damaged or sheared off. (This

phenomenon is common to all existing impact drivers.)

Particularly when tightening M6 (1/4") or smaller screws, tightening time must be kept extremely short: 0.5

seconds or less. The customer should be advised to carry out several screw tightening operations and

adjust the tightening time as necessary by measuring the tightening torque with an appropriate torque

wrench or driver before commencing continuous operation.

3. Tightening torque variation

The tightening torque of the cordless impact drivers or wrenches may vary slightly in accordance with the

factors described below. Salespersons are requested to advise the customers to confirm that the

appropriate tightening torque is obtained by measuring the torque with an appropriate torque wrench or

torque driver at the beginning of the tightening operations, and as necessary during the tightening

operations. In addition, the torque values shown in page 6 above are useful as a handy reference, and may

be utilized as tentative standards.

(1) Voltage of battery

The tightening torque is affected by the voltage output of the battery. The tightening torque decreases

as the number of bolts tightened increases. This phenomenon is caused by the decline in voltage output

of the battery due to the increasing number of bolts tightened. In particular, the tightening torque

decreases rapidly just before the overdischarge protection circuit is activated. As this phenomenon is an

inherent drawback in any cordless impact driver/wrench, salespersons are requested to ensure that the

customers are fully aware of and understand this characteristic.

Precautions for use of the Type BCL 1430 lithium-ion battery

The Type BCL 1430 lithium-ion battery is equipped with a protective function that automatically stops

output to extend the battery life. The motor may stop automatically even though the switch is depressed

continuously when the remaining battery level is low (about 8 V or lower). This is because the protective

function is activated and the battery is not faulty. Charge the battery immediately in such case.

(2) Effects of low ambient temperature

The tightening torque required may be reduced at low ambient temperature under the influence of

grease and different torque coefficients (depending on manufacturing and finishing processes, and

specified by bolt manufacturers).

(3) Different bolt diameter

Difference in bolt diameter may cause variation of the required levels of tightening torque. Generally,

high tightening torque is required for large bolts.

(4) Different materials tightened

When a bolt is tightened into a soft material such as aluminum, plastic, wood, etc., the tightening torque

is considerably low in comparison with the tightening torgue reguired for tightening a bolt into a hard

material such as steel.

-12-

(5) Different tightening conditions

The tightening torque may vary in accordance with the bolt torque coefficients (depending on

manufacturing processes, and specified by bolt manufacturers), bolt grade and bolt length even though

the dimensions of the bolts are the same. The tightening torque may also vary depending on the surface

finishing state of tightening materials (steel, aluminum, etc.), and materials to be tightened. In addition, if

there is seal packing, clearance, etc. between tightening materials, the tightening torque is decreased.

(6) Wear and looseness of the socket

With extended use, the hexagonal portion of the socket which is fitted to the head of a bolt or drill bit,

and/or hexagonal portion of the driver chuck which is fitted onto the anvil in the main body will be worn

and loose. Wear and looseness will cause a proportionate loss of tightening torque. In addition, use of

an incorrect size socket (slightly larger than the bolt being tightened) will also result in decreased

torque.

(7) Bolt and nut rotate together

The tightening torque that can be achieved may be considerably decreased if the bolt and the nut rotate

together during the tightening operation. The customers should be advised to carefully observe the

operation and ensure this does not occur.

4. Precautions for efficient use of charger and battery

(1) Battery may not be rechargeable immediately after use.

If the battery is exposed to direct sunshine for an extended period or if the temperature of the battery is

high immediately after it has been used in the Model WH 14DCAL/WH 14DY, the pilot lamp may not

light up even though the battery is connected to the charger. The battery is rechargeable when the

battery temperature is within the range specified in the table below. The customers should be advised to

place the battery in a shaded area with a good airflow and allow sufficient cooling before recharging if

the temperature of the battery is high. The cooling time required before recharging can be accomplished

varies from a few minutes to about 10 minutes, depending on the load, duration of use and ambient

temperature.

Battery temperature

Battery

Model UC 18YRL charger Model UC 18YG charger

Type BCL 1430

0°C to 50°C

Type EB 14B

-5°C to 55°C0°C to 40°C

-13-

5. Other precautions

(1) Check for cracks or other damage on the socket

Cracks or any other faults on the socket are very hazardous. In addition, cracks or other damage to the

accessories may cause loss of tightening torque efficiency. Advise the customers to check the

accessories periodically and ensure that there are no abnormalities.

(2) Socket dimensions

Be sure to use an appropriate socket that matches the bolt and/or nut dimensions. If the socket

dimensions are larger than the bolts or nuts, the tightening torque may be decreased and the socket

may be easily damaged. Please refer to the table in page 4 for appropriate socket dimensions.

(3) Lubrication of hammering section

Frequent or continuous use of the tool may cause excessive temperature rise of the hammering section,

resulting in depletion of grease and subsequent wear of the components which may, in turn, cause loss

of tightening efficiency. Accordingly, it is necessary to periodically replenish grease in the hammering

section to ensure proper lubrication of the moving and sliding components.

(4) Precaution against impact and water

Do not give a strong impact on the Models WH 14DCAL and WH 14DY such as dropping or do not wet

them with water because precision components are incorporated in them. Otherwise, a malfunction will

occur.

-14-

WARNING: Without fail, remove the storage battery (Type BCL 1430/EB 14B) from the main body

before starting repair or maintenance work. Because the tool is cordless, if the battery is

left in and the switch is activated inadvertently, the motor will start rotating

unexpectedly, which could cause serious injury.

1. Precautions in disassembly and reassembly

The [Bold] numbers in the description below correspond to the item numbers in the Parts List and the

exploded assembly diagram of the Model WH 14DCAL/WH 14DY.

1. Removal of guide sleeve (D)

(1) By following the procedure shown in the figures below, remove the Retaining Ring [9], Washer (D) [8],

Guide Spring (C) [7] and Guide Sleeve (D) [6] in this order. Avoid quickly raising the Retaining Ring [9] or

it may fly out forcefully. Be sure not to lose the two Steel Balls D3.5 [3] in anvil (A) of the Final Gear [2].

Disassembl

REPAIR GUIDE

Hold the body and adjust the gap of the Retaining Ring [9] to

the groove of anvil (A), then insert the tip of a small flat-blade

screwdriver into the groove at an angle.

Slide the small flat-blade screwdriver under one side of the gap

of the Retaining Ring [9].

Small flat-blade

screwdriver

nvil (A)

Retaining Ring [9]

Washer (D) [8]

Gap of the Retaining

Ring [9]

Guide Sleeve (D) [6]

Slowly raise the Retaining Ring [9] using the end face of

Guide Sleeve (D) [6] as a fulcrum.

Press down Washer (D) [8] with the small flat-blade

screwdriver.

•

Removal of guide sleeve (D)

-15-

Washer (S) [15]

J-297 base for washer (S)

Raised face of hamme

Top of spindle cam

Spindle [18]

Hammer Spring [14]

Stopper (B) [16]

Hammer (A) [11]

Spindle [18]

Steel Ball D4.76 [17]

Push down.

• Disassembly of the hammer assembly Fig. 1

2. Disassembly of housing (A).(B) set

(1) Remove the eight Tapping Screws (W/Flange) D4 x 20 (Black) [26] to remove housing (B) from Housing

(A).(B) Set [45].

(2) Remove the Hammer Case Set [5], Inner Cover (D) [25], Ring Gear (E) [21], Anvil (B) [10], hammer ass'y,

Spring (S) [32], Paddle Lever [42], Spring [41] and Pushing Button [30]. Then remove the assembly of the

Battery Terminal [37], Noise Suppressor [39], DC-Speed Control Switch [35] and Motor [28] from housing

(A).

3. Disassembly of the power supply unit

(1) Each of the Battery Terminal [37], DC-Speed Control Switch [35] and Motor [28] removed in an

assembled status in the above step is connected to an internal wire by soldering. Remove the Battery

Terminal [37], DC-Speed Control Switch [35] and Motor [28] by desoldering respectively.

4. Disassembly of the hammer assembly

(1) Mount the hammer assembly onto the J-297 base for washer (S) (special tool). With a hand press, push

down the top of the Spindle [18] to compress the Hammer Spring [14]. In this position, remove Stopper (B)

[16] with a small flat-blade screwdriver 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 [18]. With a hand press, push down either of the raised faces of Hammer (A) [11] to compress the

Hammer Spring [14]. In this position, extract the two Steel Balls D4.76 [17] from the cam grooves of the

Spindle [18] and Hammer (A) [11] with a small flat-blade screwdriver.

(3) Release the hand press and lift Hammer (A) [11] and Washer (S) [15] together to extract them from the

Spindle [18]. Remove the Hammer Spring [14].

-16-

Red marking

(Indicate positive side)

Soldering of the internal wires

pply solder to the inside of the

internal wire coating.

Motor [28]

Battery Terminal [37]

DC-Speed Control Switch [35]

Internal Wire (Black) [29]

Internal Wire (Red) [34]

Noise Suppressor [39]

Internal Wire (Black) [38]

Internal Wire (Red) [34]

•

Soldering the internal wires to the Battery Terminal

[37]

and the DC-Speed Control Switch

[35]

Fig. 2

•

Soldering the internal wires to the DC-Speed Control Switch

[35]

and the Motor

[28]

Reassembly can be accomplished by following the disassembly procedures in reverse. However, special

attention should be given to the following items.

1. Reassembly of the power supply unit

(1) Pay attention to the polarity of the Motor [28] and the soldering direction of the internal wires when

soldering the internal wires to the Battery Terminal [37], Motor [28] and DC-Speed Control Switch [35].

The red-marked side of the Motor [28] is positive.

(2) Mounting the Battery Terminal [37], DC-Speed Control Switch [35] and Motor [28]

Connect the internal wires (red and black) of the controller as shown in Fig. 2 so that the internal wire

(red) does not contact the motor shaft and the internal wire (black) is not placed on the boss rib seat of

the pushing button.

Reassembl

-17-

Push the internal wire (black) in securely so that the internal wire

(black) is not placed on the boss rib seat of the pushing button.

Internal wire (Red) Housing (A)

Motor shaft

Internal wire (Black)

Do not contact the motor shaft.

Boss rib seat of the

pushing button

2. Reassembly of the hammer assembly

(1) Put Washer (S) [15] onto the shaft of the Spindle [18] and mount Hammer (A) [11] containing the

twenty-four Steel Balls D3.175 [12], Washer (J) [13] and Hammer Spring [14] to the Spindle [18].

(2) Align the top of the cam groove on the Spindle [18] with the steel ball guide groove on Hammer (A) [11].

Press down either of the raised faces of Hammer (A) [11] with a hand press to compress the Hammer

Spring [14] until the end surface of the hammer contacts the flange of the Spindle [18].

(3) Insert the two Steel Balls D4.76 [17] into the steel ball guide groove. Check that the Steel Balls D4.76

[17] 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 [18] to compress the Hammer Spring [14]. On this condition, mount Stopper (B) [16] onto

the spindle shaft and then release the hand press (Fig. 1).

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

Washer (E) [22] to it.

(6) Press-fit the Felt [24] and the Ball Bearing 6901VVCMPS2L [23] to Inner Cover (D) [25].

(7) (a) When using the Hammer Case Set [5]:

Mount Anvil (B) [10], hammer assembly, Ring Gear (E) [21] and inner cover to the Hammer Case [1]

as shown in Fig. 4.

(b) When using the Hammer Case [1] and the Final Gear [2]:

Mount the Final Gear [2] to the Hammer Case [1] so that the Final Gear [2] is flush with the end face

of the Hammer Case [1]. Check that the gear meshes properly. Then press-fit the Final Gear [2] with

a hand press. Fit the Retaining Ring for D28 Hole [4] in the groove of the Hammer Case [1] being

careful of the mounting direction of the Retaining Ring for D28 Hole [4] (face the shear droop side to

the inside). Mount Anvil (B) [10], hammer assembly, Ring Gear (E)

[21] and inner cover to the

Hammer Case [1] in the same manner as the above step (a).

(8) Mount the Motor [28] to the above mechanical ass'y and mount it to housing (A). Check that the gears

of the motor pinion, Idle Gear Set [19] and Ring Gear (E) [21] turn smoothly. If not, the gears mesh

improperly. Check the meshing condition.

•

Note when mounting the controller terminal ass'y and the DC-speed control switch to housing (A

)

Fig. 3

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Hitachi WH 14DY Technical Data And Service Manualice Manual

Brand: Hitachi

Model: WH 14DY

Category: Cordless combi drills

Type: Technical Data And Service Manualice Manual

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Hitachi WH 14DY Technical Data And Service Manualice Manual

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Hitachi WH 14DY Technical Data And Service Manualice Manual

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