HITACHI WH 12DAF2, WR 12DAF2 User Manual

Cordless Impact Driver/Wrench Atornillador/Llave de impacto a batería

日立牌充電式衝擊起子機扳手機

WH 12DAF2 • WR 12DAF2

Handling instructions Instrucciones de manejo

使用說明書

WH12DAF2 WR12DAF2

Read through carefully and understand these instructions before use. Leer cuidadosamente y comprender estas instrucciones antes del uso.

使用前務請詳加閱讀。

〈UC18YG〉

〈UC14YFA〉

109

(B)

(A)

V V

12 V Rechargeable battery

Latch

Handle

Insert

Pull out

Insert

Pilot lamp

Hole for connecting the rechargeable battery

Movement

Guide sleeve

Hexagonal hole in the anvil

Driver bit

Hexagonal socket

Groove

Anvil

Ring

Hole

Plunger

Hook

Spring

Larger diameter faces away

Switch

Phillips-head screwdriver

Screw

Arrow

Hook cover

Indentation

Protuberance

AAAA batteries

Push button

Push

English Español 中國語

Batería recargable, 12 V

Enganche

Mango

Insertar

Sacar

Insertar

Lámpara piloto

Agujero para conectar la batería recargable

Movimiento

Manguito guía

Orificio hexagonal en el yunque

Punta de destornillador

Recaptáculo hexanogal

Ranura

Yunque

Pasador

Anillo

Orificio

Embolo

Gancho

Resorte

El diámetro más grande queda en dirección opuesta

Interruptor

Destornillador con cabeza Phillips

Tornillo

Flecha

Cubierta del gancho

Indentación

Saliente

Pilas AAAA

Pulsador

Presionar

12伏特充電式電池插銷把手插入拉出

插入指示燈

充電式電池連接孔

移動導筒砧座的六角形孔起子刀頭六角形套筒凹槽砧座銷子 O形環孔柱塞

掛鉤彈簧

較大直徑向外

開關十字螺絲起子螺釘箭頭掛鉤蓋缺口凸起 AAAA電池按鈕按

English

GENERAL OPERATIONAL PRECAUTIONS

WARNING! When using battery operated tools, basic

safety precautions should always be followed to reduce the risk of fire, leaking batteries and personal injury, including the following. Read all these instructions before operating this product and save these instructions. For safe operations:

1. Keep work area clean. Cluttered areas and benches invite injuries.

2. Consider work area environment. Do not expose tools to rain. Do not use tools in damp or wet locations. Keep work area well lit. Do not use tools where there is risk to cause fire or explosion.

3. Keep children away. Do not let visitors touch the tool. All visitors should be kept away from work area.

4. Store batteries or idle tools. When not in use, tools and batteries should be stored separately in a dry, high or locked up place, out of reach of children. Ensure that battery terminals cannot be shorted by other metal parts such as screws nails etc.

5. Do not force the tool. It will do the job better and safer at the rate for which it was intended.

6. Use the right tool. Do not force small tools or attachments to do the job of a heavy duty tool. Do not use tools for purposes not intended.

7. Dress properly. Do not wear loose clothing or jewellery, they can be caught in moving parts. Rubber gloves and non-skid footwear are recommended when working outdoors. Wear protecting hair covering to contain long hair.

8. Use safety glasses. Also use face or dust mask if the cutting operation is dusty.

9. Connect dust extraction equipment. If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used.

10. Do not abuse the cord (if fitted). Never carry the tool by the cord or yank it to disconnect it from the socket. Keep the cord away from heat, oil and sharp edges.

11. Secure work. Use clamps or a vice to hold the work. It is safer than using your hand and it frees both hands to operate the tool.

12. Do not overreach. Keep proper footing and balance at all times.

13. Maintain tools with care. Keep cutting tools sharp and clean for better and safer performance. Follow instructions for lubrication and changing accessories. Inspect tool cords periodically and if damaged, have it repaired by authorized service facility. Keep handles dry, clean, and free from oil and grease.

14. Disconnect tools. Where the designs permits, disconnect the tool from its battery pack, when not in use, before servicing, and when changing accessories such as blades, bits and cutters.

15. Remove adjusting keys and wrenches. Form the habit of checking to see that keys and adjusting wrenches are removed from the tool before turning it on.

16. Avoid unintentional starting. Do not carry the tool with a finger on the switch.

17. Stay alert. Watch what you are doing. Use common sense. Do not operate the tool when you are tired.

18. Check damaged parts. Before further use of the tool, a guard or other part that is damaged should be carefully checked to determine that it will operate properly and perform its intended function.

Check for alignment of moving parts, free running of moving parts, breakage of parts, mounting and any other conditions that may affect its operation. A guard or other part that is damaged should be properly repaired or replaced by an authorized service center unless otherwise indicated in this handling instructions. Have defective switches replaced by an authorized service facility. Do not use the tool if the switch does not turn it on and off.

19. Warning

䡬 The use of any accessory or attachment, other

than those recommended in this handling instructions, may present a risk of personal injury.

䡬 Ensure that the battery pack is correct for the tool. 䡬 Ensure that the outside surface of battery pack or

tool is clean and dry before plugging into charger.

䡬 Ensure that batteries are charged using the correct

charger recommended by the manufacturer. Incorrect use may result in a risk of electric shock, overheating or leakage of corrosive liquid from the battery.

20. Have your tool repaired by a qualified person. This tool is in accordance with the relevant safety requirements. Repairs should only be carried out by qualified persons using original spare parts, otherwise this may result in considerable danger to the user.

21. Disposal of battery Ensure battery is disposed of safely as instructed by the manufacturer.

22. If under abusive conditions, liquid is ejected from the battery, avoid contact If this accidentally occurs, frush with water. If liquid contacts eyes additionally, seek medical help.

PRECAUTIONS FOR CORDLESS IMPACT DRIVER

1. This is portable tool for tightening and loosenig screws. Use it only for these operation.

2. Use the earplugs if using for a long time.

3. One-hand operation is extremely dangerous; hold the unit firmly with both hands when operating.

4. After installing the driver bit, pull lightly out the bit to make sure that it does not come loose. If the bit is not installed properly, it can come loose during use, which can be dangerous.

5. Use the bit that matches the screw.

6. Tightening a screw with the impact driver at an angle to that screw can damage the head of the screw and the proper force will not be transmitted to the screw. Tighten with this impact driver lined up straight with the screw.

7. Always charge the battery at a temperature of 0 – 40°C. A temperature of less than 0°C will result in over charging which is dangerous. The battery cannot be charged at a temperature greater than 40°C. The most suitable temperature for charging is that of 20 – 25°C.

8. Do not use the charger continuously. When one charging is completed, leave the charger for about 15 minutes before the next charging of battery.

9. Do not allow foreign matter to enter the hole for connecting the rechargeable battery.

10. Never disassemble the rechargeable battery and charger.

11. Never short-circuit the rechargeable battery. Short-circuiting the battery will cause a great electric current and overheat. It results in burn or damage to the battery.

English

12. Do not dispose of the battery in fire. If the battery burnt, it may explode.

13. Do not insert object into the air ventilation slots of the charger. Inserting metal objects or inflammables into the charger air ventilation slots will result in electrical shock hazard or damaged charger.

14. Bring the battery to the shop from which it was purchased as soon as the post-charging battery life becomes too short for practical use. Do not dispose of the exhausted battery.

15. Using an exhausted battery will damage the charger.

PRECAUTIONS FOR CORDLESS IMPACT WRENCH

1. This is a portable tool for tightening and loosening bolts and nuts. Use it only for these operation.

2. Use the earplugs if using for a long time.

3. One-hand operation is extremely dangerous; hold the unit firmly with both hands when operating.

4. Check that the socket is not cracked or broken. Broken or cracked sockets are dangerous. Check the socket before using it.

5. Secure the socket with the socket pin and the ring. If the socket pin or ring securing the socket is damaged, the socket may come off from the impact wrench, which is quite dangerous. Do not use socket pins or rings that are deformed, worn out, cracked, or in any other way damaged. Always make sure to install the socket pin and ring in the correct position.

6. Check the tightening torque. The appropriate torque for tightening a bolt depends on the material the bolt is made of, its dimensions, grade, etc. Also, the tightening torque generated by this impact wrench depends on the materials and dimensions of the bolt, how long the impact wrench is applied for the way in which the socket is installed, etc. Also the torque when the battery has just been charged and when it is about to run out are slightly different. Use a torque wrench to check that the bolt has been tightened with the appropriate torque.

7. Stop the impact wrench before switching the direction of rotation. Always release the switch and wait for impact wrench to stop before switching the direction of rotation.

8. Never touch the turning part. Do not allow the turning socket section to get near your hands or any other part of your body. You could

be cut or caught in the socket. Also, be careful not to touch the socket after using continuously it for a long time. It gets quite hot and could burn you.

9. Never let the impact wrench turn without a load when using the universal joint. If the socket turns without being connected to a load, the universal joint causes the socket to turn wildly. You could get hurt or the movement of the socket could shake the impact wrench so much as to make you drop it.

10. Always charge the battery at a temperature of 0 – 40°C. A temperature of less than 0°C will result in over charging which is dangerous. The battery cannot be charged at a temperature greater than 40°C. The most suitable temperature for charging is that of 20 – 25°C.

11. Do not use the charger continuously. When one charging is completed, leave the charger for about 15 minutes before the next charging of battery.

12. Do not allow foreign matter to enter the hole for connecting the rechargeable battery.

13. Never disassemble the rechargeable battery and charger.

14. Never short-circuit the rechargeable battery. Short-circuiting the battery will cause a great electric current and overheat. It results in burn or damage to the battery.

15. Do not dispose of the battery in fire. If the battery burnt, it may explode.

16. Do not insert object into the air ventilation slots of the charger. Inserting metal objects or inflammables into the charger air ventilation slots will result in electrical shock hazard or damaged charger.

17. Bring the battery to the shop from which it was purchased as soon as the post-charging battery life becomes too short for practical use. Do not dispose of the exhausted battery.

18. Using an exhausted battery will damage the charger.

MODEL

WH12DAF2:with charger and case WR12DAF2:with charger and case

SPECIFICATIONS

POWER TOOL

Model WH12DAF2 WR12DAF2 No-load speed 0 – 2500/min Capacity M4 – M8 (Small screw) M6 – M14 (Ordinary bolt)

Tightening torque

Rechargeable battery EB1214S: Ni-Cd battery, 12 V (1.4 Ah 10 cells)

Weight 1.6 kg (EB1214S Installation)

M5 – M12 (Ordinary bolt) M6 – M10 (High tension bolt)

M5 – M10 (High tension bolt)

Maximum 110 N·m {1120 kgf·cm} Tightening is M12 high tension bolt (strength grade 12.9), when fully charged at 20°C temp. Tightening time: 3 sec.

EB1220BL: Ni-Cd battery, 12 V (2.0 Ah 10 cells) EB1226HL: Ni-MH battery, 12 V (2.6 Ah 10 cells)

Maximum 130 N·m {1330 kgf·cm} Tightening is M12 high tension bolt (strength grade 12.9), when fully charged at 20°C temp. Tightening time: 3 sec.

English

CHARGER

Model UC14YFA UC18YG Charging time EB1214S: Approx. 30 min. (at 20°C) EB1214S: Approx. 30 min. (at 20°C)

EB1220BL: Approx. 50 min. (at 20°C) EB1220BL: Approx. 50 min. (at 20°C) EB1226HL: Approx. 60 min. (at 20°C) ×

Charging voltage 7.2 – 14.4 V 7.2 – 18 V Weight 0.6 kg 0.3 kg

“x” Indicates that the battery pack is not compatible with that specific charger.

NOTE: The charging time may vary according to the ambient temperature and power source voltage.

STANDARD ACCESSORIES

1. Charger (UC14YFA or UC18YG) ............................... 1

2. Plastic case ................................................................ 1

Standard accessories are subject to change without notice.

OPTIONAL ACCESSORIES (Sold separately)

1. Battery (EB1214S, EB1220BL, EB1226HL)

2. For WH12DAF2

There are two types of attachment sizes for the driver bit and the socket. Please refer to the table below and select the attachment size for the driver bit or socket that is appropriate for your WH12DAF2.

Attachment size Purchase location

Type-L

Type-S

3. For WR12DAF2

The WR12DAF2 type is a 12.7 square driver specification. Please select the socket with the appropriate attachment size.

Optional accessories are subject to change without notice.

17mm

12mm

13mm

Republic of Korea, Taiwan, Hong Kong, People’s Republic of China, Republic of Singapore

9mm

Other than above regions.

APPLICATION

〈WH12DAF2〉

䡬 Driving and removing of small screws, small bolts,

etc.

〈WR12DAF2〉 䡬 Tightening and loosening of all types of bolts and

nuts, used for securing structural items

BATTERY REMOVAL/INSTALLATION

1. Battery removal

Hold the handle tightly and push the battery latch to remove the battery. (See Fig. 1 and 2)

CAUTION:

Never short-circuit the battery.

2. Battery installation

Insert the battery while observing its polarities. (See

Fig. 2)

CHARGING

〈UC14YFA〉 Before using the power tool, charge the battery as follows.

1. Connect the charger’s power cord to a receptacle

When the power cord is connected, the charger’s pilot lamp will blink in red. (At 1-second intervals.)

2. Insert the battery into the charger

Insert the battery firmly, in the direction shown in Fig. 3, until it contacts the bottom of the charger compartment.

CAUTION:

䡬 If the battery is inserted in the reverse direction, not

only recharging will become impossible, but it may also cause problems in the charger such as deformed recharging terminal.

3. Charging

When inserting a battery in the charger, charging will commence and the pilot lamp will light up continuously in red. When the battery becomes fully recharged, the pilot lamp will blink in red. (At 1-second intervals.) (See Table 1)

(1) Pilot lamp indication

The indications of the pilot lamp will be as shown in Table 1, according to the condition of the charger or the rechargeable battery.

English

Table 1

Before charging

While charging

Charging complete

Charging impossible

Blinks (RED)

Lights (RED)

Blinks (RED)

Flikers (RED)

Lights (GREEN)

Indications of the lamps

Lights for 0.5 seconds. Does not light for

0.5 seconds. (off for 0.5 seconds)

Lights continuously

Lights for 0.5 seconds. Does not light for

0.5 seconds. (off for 0.5 seconds)

Lights for 0.1 seconds. Does not light for

0.1 seconds. (off for 0.1 seconds)

Lights continuously

Malfunction in the battery or the charger.

The battery temperature is high, making recharging impossible.

(2) Regarding the temperatures of the rechargeable battery

The temperatures for rechargeable batteries are as shown in the table below, and batteries that have become hot should be cooled for a while before being recharged.

Table 2 Recharging ranges of batteries

Rechargeable batteries which the battery

EB1214S, EB1220BL –5°C – 60°C

EB1226HL 0°C – 45°C

4. Disconnect the charger’s power cord from the receptacle

5. Hold the charger firmly and pull out the battery NOTE:

Be sure to pull out the battery from the charger after use, and then keep it.

Regarding electric discharge in case of new batteries, etc.

As the internal chemical substance of new batteries and batteries that have not been used for an extended period is not activated, the electric discharge might be low when using them the first and second time.This is a temporary phenomenon, and normal time required for recharging will be restored by recharging the batteries 2 – 3 times.

How to make the batteries perform longer

(1) Recharge the batteries before they become completely

exhausted. When you feel that the power of the tool becomes weaker, stop using the tool and recharge its battery. If you continue to use the tool and exhaust the electric current, the battery may be damaged and its life will become shorter.

(2) Avoid recharging at high temperatures.

A rechargeable battery will be hot immediately after use. If such a battery is recharged immediately after use, its internal chemical substance will deteriorate, and the battery life will be shortened. Leave the battery and recharge it after it has cooled for a while.

Temperatures at

can be recharged

CAUTION:

䡬 If the battery is charged while it is heated because it

has been left for a long time in a location subject to direct sunlight or because the battery has just been used, the pilot lamp of the charger lights up green. In such a case, first let the battery cool, then start charging.

䡬 When the pilot lamp flikers in red quickly (at 0.2-

second intervals), check for and take out any foreign objects in the charger’s battery installation hole. If there are no foreign objects, it is probable that the battery or charger is malfunctioning. Take it to your Authorized Service Center.

䡬 Since the built-in micro computer takes about 3

seconds to confirm that the battery being charged with UC14YFA is taken out, wait for a minimum of 3 seconds before reinserting it to continue charging. If the battery is reinserted within 3 seconds, the battery may not be properly charged.

〈

Before using the power tool, charge the battery as follows.

1. Connect the charger power cord to the receptacle

2. Insert the battery into the charger

䡬 Regarding the temperatures of the rechargeable

Table 3 Recharging ranges of batteries

䡬 The pilot lamp goes off to indicate that the battery is

〉

UC18YG

Connecting the power cord will turn on the charger.

Insert the battery firmly while observing its direction, until it contacts the bottom of the charger (the pilot lamp lights up) (See Fig. 4).

CAUTION

If the pilot lamp does not light up, pull out the power cord from the receptacle and check the battery mounting condition.

battery The temperatures for rechargeable batteries are as shown in Table 3.

Rechargeable batteries which the battery

EB1214S, EB1220BL 0°C – 45°C

fully charged.

Temperatures at

can be recharged

English

The battery charging time becomes longer when a temperature is low or the voltage of the power source is too low. When the pilot lamp does not go off even if more than 120 minutes have elapsed after starting of the charging, stop the charging and contact your HITACHI AUTHORIZED SERVICE CENTER.

CAUTION

If the battery is heated due to direct sunlight, etc., just after operation, the charger pilot lamp may not light up. At that time, cool the battery first, then start charging.

3. Disconnect the charger’s power cord from the receptacle

4. Hold the charger firmly and pull out the battery

NOTE

After charging, pull out batteries from the charger first, and then keep the batteries properly.

Regarding electric discharge in case of new batteries, etc.

As the internal chemical substance of new batteries and batteries that have not been used for an extended period is not activated, the electric discharge might be low when using them the first and second time. This is a temporary phenomenon, and normal time required for recharging will be restored by recharging the batteries 2 – 3 times.

How to make the batteries perform longer.

(1) Recharge the batteries before they become

completely exhausted. When you feel that the power of the tool becomes weaker, stop using the tool and recharge its battery. If you continue to use the tool and exhaust the electric current, the battery may be damaged and its life will become shorter.

(2) Avoid recharging at high temperatures.

PRIOR TO OPERATION

1. Preparing and checking the work environment

Make sure that the work site meets all the conditions laid forth in the precautions.

2. Checking the battery

Make sure that the battery is installed firmly. If it is at all loose it could come off and cause an accident.

3. Installing the bit (WH12DAF2)

Always follow the following procedure to install driver bit. (Fig. 5)

(1) Pull the guide sleeve away from front of the tool. (2) Insert the bit into the hexagonal hole in the anvil. (3) Release the guide sleeve and it returns to its original

position.

CAUTION:

If the guide sleeve does not return to its original position, then the bit is not installed properly.

4. Selecting the socket matched to the bolt (WR12DAF2)

Be sure to use a socket which is matched to the bolt

to be tightened. Using an improper socket will not only result in insufficient tightening but also in damage to the socket or nut. A worn or deformed hex. or square-holed socket will not give an adequate tightness for fitting to the nut or anvil, consequently resulting in loss of tightening torque. Pay attention to wear of socket hole, and replace before further wear has developed. Finally, install the socket prescribed in Item 5. The section on “Optional Accessories” details the relationship between bolt sizes and sockets. Sockets are named according to the dihedral width of the hexagonal hole.

5. Installing a socket (WR12DAF2)

Select the socket to be used.

䢇 Pin, O-ring type (Fig. 6 and 7) (1) Align the hole in the socket with the hole in the anvil

and insert the anvil into the socket. (2) Insert the pin into the socket. (3) Attach the ring to the groove on the socket. 䢇 Plunger type (Fig. 8)

Align the plunger located in the square part of the

anvil with the hole in the hex. socket. Then push the

plunger, and mount the hex. socket on the anvil.

Check that the plunger is fully engaged in the hole.

When removing the socket, reverse the sequence.

HOW TO USE

CAUTION:

䡬 When using the light equipped hook, pay sufficient

attention so that the main equipment does not fall. If

the tool falls, there is a risk of accident. 䡬 Do not attach the tip tool except phillips bit to the tool

main unit when carrying the tool main unit with the

light equipped hook suspended from a waist belt.

Injury may result if you carry the equipment

suspended from the waist belt with sharp tipped

components such as drill bit attached.

1. Using the light equipped hook

The light equipped hook can be installed on the right

or left side and the angle can be adjusted in 5 steps

between 0° and 80°. (1) Operating the hook

(a) Pull out the hook toward you in the direction of

arrow (A) and turn in the direction of arrow (B). (Fig. 9)

(b) The angle can be adjusted in 5 steps (0°, 20°, 40°,

60°, 80°). Adjust the angle of the hook to the desired position for use.

(2) Switching the hook position

CAUTION:

Incomplete installation of the hook may result in

bodily injury when used.

(a) Securely hold the main unit and remove the screw

using a slotted head screwdriver or a coin. (Fig.

10) (b) Remove the hook and spring. (Fig. 11) (c) Install the hook and spring on the other side and

securely fasten with screw. (Fig. 12)

NOTE:

Pay attention to the spring orientation. Install the spring with larger diameter away from you. (Fig. 12)

English

(3) Using as an auxiliary light

(a) Press the switch to turn off the light.

If forgotten, the light will turn off automatically after 15 minutes.

(b) The direction of the light can be adjusted within

the range of hook positions 1 - 5. (Fig. 13) 䡬 Lighting time

AAAA manganese batteries: approx. 15 hrs.

CAUTION:

(4) Replacing the batteries

NOTE:

CAUTION:

䡬 Failure to observe the following can result in battery

䡬 Do not discard batteries together with normal trash

䡬 Store batteries out of the reach of children. 䡬 Use batteries correctly in accordance with the battery

2. Check the rotational direction

CAUTION:

3. Switch operation

䡬 When the trigger switch is depressed, the tool rotates.

䡬 The rotational speed can be controlled by varying the

4. Tightening and loosening screws (WH12DAF2)

AAAA alkali batteries: approx. 30 hrs.

Do not look directly into the light. Such actions could result in eye injury.

(a) Loosen the hook screw with a phillips-head

screwdriver (No. 1). (Fig. 14) Remove the hook cover by pushing in the direction of the arrow. (Fig. 15)

(b) Remove the old batteries and insert the new

batteries. Align with the hook indications and position the plus (+) and minus (–) terminals correctly. (Fig. 16)

the protuberance of the hook cover, press the hook cover in the direction opposite to that of the arrow shown in Fig. 15 and then tighten the screw. Use commercially available AAAA batteries (1.5 V).

Do not tighten the screw excessively. Such action could strip the screw threads.

leakage, rust or malfunction. Position the plus (+) and minus (–) terminals correctly. Replace both batteries at the same time. Do not mix old and new batteries. Remove exhausted batteries from the hook immediately.

and do not throw batteries into fire.

specifications and indications.

The bit rotates clockwise (viewed from the rear side) by pushing the R-side of the push button. The L-side of the push button is pushed to turn the bit counterclockwise. (See Fig. 17) (The are provided on the body.)

The push button cannot be switched while the impact driver is turning. To switch the push button, stop the impact driver, then set the push button.

When the trigger is released, the tool stops.

amount that the trigger switch is pulled. Speed is low when the trigger switch is pulled slightly and increases as the trigger switch is pulled more.

Install the bit that matches the screw, line up the bit in the grooves of the head of the screw, then tighten it. Push the impact driver just enough to keep the bit fitting the head of the screw.

and R marks

CAUTION:

Applying the impact driver for too long tightens the screw too much and can break it. Tightening a screw with the impact driver at an angle to that screw can damage the head of the screw and the proper force will not be transmitted to the screw. Tighten with this impact driver lined up straight with the screw.

5. Number of screws tightenings possible (WH12DAF2)

Please refer to the table below for the number of screw tightened possible with one charge.

EB1214S

Screw used No. of tightenings

Wood screw ø4 × 50 (Soft wood)

Machine screw M8 × 16

These values may vary slightly, according to surrounding temperature and battery characteristics.

6. Number of bolt tightened possible (WR12DAF2)

Please refer to the table below for the number of bolt tightened possible with one charge.

EB1214S

Bolt used No. of tightenings

M12 × 45 High tension bolt

These values may vary slightly, according to surrounding temperature and battery characteristics.

NOTE:

The use of the battery EB1226HL in a cold condition (below 0 degree Centigrade) can sometimes result in the weakened tightening torque and reduced amount of work. This, however, is a temporary phenomenon, and returns to normal when the battery warms up.

Approx. 190

Approx. 500

Approx. 87

OPERATIONAL CAUTIONS

1. Resting the unit after continuous work

After use for continuous bolt-tightening work, rest the unit for 15 minutes or so when replacing the battery. The temperature of the motor, switch, etc., will rise if the work is started again immediately after battery replacement, eventually resulting in burnout.

NOTE:

Do not touch the hammer case, as it gets very hot during continuous work.

2. Cautions on use of the speed control switch

This switch has a built-in, electronic circuit which steplessly varies the rotation speed. Consequently, when the switch trigger is pulled only slightly (low speed rotation) and the motor is stopped while continuously driving in screws, the components of the electronic circuit parts may overheat and be damaged.

3. Tightening torque

Refer to Fig. 18 and Fig. 19 for the tightening torque of bolts (according to size), under the conditions shown in Fig. 20. Please use this example as a general reference, as tightening torque will vary according to tightening conditions.

English

NOTE:

䡬 If a long striking time is used, screws will be strongly

tightened. This may cause the screw to break, or may damage the tip of the bit.

䡬 If the unit is held at an angle to the screw being

tightened, the head of the screw may be damaged, or the specified torque may not be transmitted to the screw. Always keep the unit and the screw being tightened in a straight line.

4. Use a tightening time suitable for the screw

The appropriate torque for a screw differs according to the material and size of the screw, and the material being screwed etc., so please use a tightening time suitable for the screw. In particular, if a long tightening time is used in the case of screws smaller than M8, there is a danger of the screw breaking, so please confirm the tightening time and the tightening torque beforehand.

5. Work at a tightening torque suitable for the bolt under impact

The optimum tightening torque for nuts or bolts differs with material and size of the nuts or bolts. An excessively large tightening torque for a small bolt may stretch or break the bolt. The tightening torque increases in proportion to the operaton time. Use the correct operating time for the bolt.

6. Holding the tool

Hold the impact wrench firmly with both hands. In this case hold the wrench in line with the bolt. It is not necessary to push the wrench very hard. Hold the wrench with a force just sufficient to counteract the impact force.

7. Confirm the tightening torque

The following factors contribute to a reduction of the tightening torque. So confirm the actual tightening torque needed by screwing up some bolts before the job with a hand torque wrench. Factors affecting the tightening torque are as follows.

(1) Voltage

When the discharge margin is reached, voltage decreases and tightening torque is lowered.

(2) Operating time

The tightening torque increases when the operating time increases. But the tightening torque does not increase above a certain value even if the tool is driven for a long time. (See Fig. 18 and 19)

(3) Diameter of bolt

The tightening torque differs with the diameter of the bolt as shown in Fig. 18 and 19. Generally a larger diameter bolt requires larger tightening torque.

(4) Tightening conditions

The tightening torque differs according to the torque ratio; class, and length of bolts even when bolts with the same size threads are used. The tightening torque also differs according to the condition of the surface of workpiece through which the bolts are to be tightened. When the bolt and nut turn together, torque is greatly reduced.

(5) Using optional parts (WR12DAF2)

The tightening torque is reduced a little when an extension bar, universal joint or a long socket is used.

(6) Clearance of the socket (WR12DAF2)

A worn or deformed hex. or a square-holed socket will not give an adequate tightness to the fitting between the nut or anvil, consequently resulting in loss of tightening torque. Using an improper socket which does not match to the bolt will result in an insufficient tightening torque.

(7) Tightening torque varies, depending on the battery’s

charge level. (WR12DAF2) Fig. 21 show examples of the relationship between tightening torque and the number of tightenings, for WR12DAF2. As shown, tightening torque gradually weakens with the increase in the number of tightenings. In particular, as the torque decreases very close to the complete discharge (“a” margin in graph), the unit’s impact weakens, the number of time impacts declines and tightening torque drops off abruptly. If this occurs, check torque level, then recharge the battery if necessary.

〈

WH12DAF2

•

kgf

1000

800

600

400

Tightening torque

200

〉

•

100

High tension bolt

M8 × 30

kgf

•

1000

800

600

•

M10 × 30

100

High tension bolt

kgf

•

1200

1000

800

600

•

M12 × 45

120

High tension bolt

100

Ordinary bolt

0123 0123 0123

Tightening time: sec. (Steel plate thickness

t = 10 mm)

400

Tightening torque

200

Ordinary bolt

Tightening time: sec. (Steel plate thickness

t = 10 mm)

400

Tightening torque

200

Tightening time: sec. (Steel plate thickness

t = 25 mm)

Fig. 18

English

〈

WR12DAF2

•

kgf

1000

800

600

400

200

Tightening torque

•

kgf

〉

•

kgf

1200

N•m

Tightening time: sec. (Steel plate thickness

t = 10 mm)

M8 × 30

100

High tension bolt

Ordinary bolt

012 3 0123 01 23

1000

800

600

400

Tightening torque

200

Tightening time: sec. (Steel plate thickness

t = 10 mm)

120

High tension bolt

100

M10 × 30

Ordinary bolt

140

1400

1200

1000

800

600

400

Tightening torque

200

120

100

High tension bolt

Ordinary bolt

Tightening time: sec. (Steel plate thickness

t = 25 mm)

M12 × 45

Fig. 19

〈WR12DAF2〉

Bolt

Nut

Steel plate thickness t

M12 × 45 High tension bolt

•

kgf

160

1600

120

1200

When full recharged

800

400

Tightening torque

0 20 40 60 80 100

Number of tightenings (PCS)/charging

*The following bolt is used. Ordinary bolt: Strength grade 4.8 High tension bolt: Strength grade 12.9

Fig. 20

(tighening time 3 sec)

When completely discharged

Fig. 21

Explanation of strength grade: 4 — Yield point of bolt: 32 kgf/mm

8 — Pulling strength of bolt: 40 kgf/mm

)(

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