WH 14 - Screwdriver HITACHI - Free user manual and instructions

Brand	Hitachi
Model	WH 14
Category	Impact Driver
Product Type	Corded Electric Impact Wrench
Power Supply	Mains, 115 V, 60 Hz, single-phase
Rated Current	4 A
No Load Speed	2100 rpm
Tightening Capacity	Bolts M10 to M16 (3/8" – 5/8")
Max Tightening Torque	147 ft-lbs (20 kg·m)
Square Drive	1/2" (12.7 mm)
Weight	2.3 kg (5.1 lb)
Double Insulation	Yes
Applications	Tightening and loosening bolts and nuts
Standard Accessories	Hex socket, pin, ring (depending on model)
Maintenance	Clean with a soft cloth and soapy water; check carbon brushes regularly
Safety	Wear safety glasses and ear protection; do not use in damp environments
Spare Parts	Use only genuine Hitachi parts
Repairability	Repair only by an authorized Hitachi service center

Frequently Asked Questions - WH 14 HITACHI

What is the power supply voltage of the Hitachi WH14 impact driver?

The Hitachi WH14 impact driver operates on mains power at 115 V (single-phase, 60 Hz). Check your outlet voltage before use.

How to install a socket on the WH14?

Align the pin located in the square part of the anvil with the hole of the hex socket. Push the pin and socket into the anvil until the pin is fully engaged.

What is the maximum tightening torque of the WH14?

The maximum tightening torque is 147 ft-lbs (20 kg·m). This torque varies depending on line voltage and operating time.

How to reverse the rotation direction?

Use the switch located on the handle cover. Set it to R for tightening (clockwise) and to L for loosening (counterclockwise). Always stop the motor before changing direction.

What standard accessories are supplied with the WH14?

The WH14 is usually supplied with a hex socket, a pin, and a ring. Accessories may vary by market. Refer to the manual for details.

How to maintain the carbon brushes?

Regularly check the brush wear. Replace them if worn to the limit (5 mm for WH14). Use only genuine Hitachi brushes. Disconnect the tool before any service.

Can I use an extension cord with the WH14?

Yes, but use an extension cord in good condition and of sufficient gauge (at least 18 AWG for length up to 7.6 m). An overly long or thin cord reduces voltage and torque.

What are the essential safety precautions?

Wear safety glasses and ear protection. Do not wear loose clothing. Work in a dry and well-lit area. Disconnect the tool before any maintenance.

How to get the best tightening torque?

Use a stable mains voltage (115 V). Tighten for an appropriate time (2 to 10 seconds depending on the bolt). Use a socket in good condition and suitable for the bolt. Check torque with a torque wrench.

Where can I get my WH14 impact driver repaired?

Repairs must be carried out only by an authorized Hitachi service center. Use only genuine spare parts to ensure safety and performance.

USER MANUAL WH 14 HITACHI

Line drawing of a handheld electric drill with handle and cable (no text or symbols)

INSTRUCTION MANUAL AND SAFETY INSTRUCTIONS

WARNING

Improper and unsafe use of this power tool can result in death or serious bodily injury!

This manual contains important information about product safety. Please read and understand this manual before operating the power tool. Please keep this manual available for others before they use the power tool.

MODE D'EMPLOI ET INSTRUCTIONS DE SECURITE

AVERTISSEMENT

IMPORTANT SAFETY INSTRUCTIONS FOR USE OF THE IMPACT WRENCH.... 7

REPLACEMENT PARTS 7

POLARIZED PLUGS 7

USE OF EXTENSION CORD ...... 8

DOUBLE INSULATION FOR SAFER OPERATION..... 9

Page

SERVICE AND REPAIRS 17

PARTS LIST 50

TABLE DES MATIERES

Français

Page

INFORMATIONS IMPORTANTES .... 18

SIGNIFICATION DES MOTS D'AVERTISSEMENT .. 18

SECURITE

CONSIGNES DE SECURITE IMPORTANTES POUR L'UTILISATION DE TOUS LES OUTILS ELECTRIQUES... 19

CONSIGNES DE SECURITE IMPORTANTES POUR L'UTILISATION DU CLÉ À CHOC .... 23

PIECES DE RECHANGE 23

FICHE POLARISEES 23

UTILISATION D'UN CORDON DE RALLONGE .. 24

DOUBLE ISOLATION POUR UN FONCTIONNEMENT PLUS SUR ..... 25

Page

UTILISATION ET ENTRETIEN

NOM DES PIECES 26

SPECIFICATIONS 26

ACCESSOIRES 27

ACCESSOIRES STANDARD ..... 27

ACCESSOIRES EN OPTION ..... 27

APPLICATIONS 28

Read and understand all of the operating instructions, safety precautions and warnings in the Instruction Manual before operating or maintaining this power tool.

Most accidents that result from power tool operation and maintenance are caused by the failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing a potentially hazardous situation before it occurs, and by observing appropriate safety procedures.

Basic safety precautions are outlined in the "SAFETY" section of this Instruction Manual and in the sections which contain the operation and maintenance instructions.

Hazards that must be avoided to prevent bodily injury or machine damage are identified by WARNINGS on the power tool and in this Instruction Manual.

Never use this power tool in a manner that has not been specifically recommended by HITACHI, unless you first confirm that the planned use will be safe for you and others.

MEANINGS OF SIGNAL WORDS

WARNING indicates a potentially hazardous situations which, if ignored, could result in serious personal injury.

CAUTION indicates a hazardous situations which, if ignored, could result in moderate personal injury, or could cause machine damage.

NOTE emphasizes essential information.

SAFETY

IMPORTANT SAFETY INSTRUCTIONS FOR USING ALL POWER TOOLS

WARNING: Death or serious bodily injury could result from improper or unsafe use of power tools. To avoid these risks, follow these basic safety instructions:

READ ALL INSTRUCTIONS

Never place your hands, fingers or other body parts near the tool's moving parts.

2. NEVER OPERATE WITHOUT ALL GUARDS IN PLACE.

Never operate this tool without all guards or safety features in place and in proper working order. If maintenance or servicing requires the removal of a guard or safety feature, be sure to replace the guard or safety feature before resuming operation of the tool.

3. ALWAYS WEAR EYE AND EAR PROTECTOR.

Protect yourself from flying or expelled wood chips, metal particles or other debris by using protective goggles or equivalent eye protector. Wear ear protector to protect yourself from excessive noise.

4. PROTECT YOURSELF AGAINST ELECTRIC SHOCK.

Prevent body contact with grounded surfaces such as pipes, radiators, ranges and refrigeration enclosures. Never operate the tool in damp or wet locations.

5. DISCONNECT TOOLS.

Never leave the tool connected to a power source. Always disconnect the tool from its power source before servicing, inspecting, maintaining, cleaning and before changing or checking any parts.

6. AVOID UNINTENTIONAL STARTING.

Don't carry the tool while it is connected to its power source. Don't carry the tool with your finger near the power switch. Be sure the power switch is in the "off" position before connecting the tool to its power source.

7. STORE TOOL PROPERLY.

When not in use, the tool should be stored in a dry place. Keep out of reach of children. Lock-out the storage area.

8. KEEP WORK AREA CLEAN.

Cluttered areas and benches invite injuries. Clear all work areas and work benches of unnecessary tools, debris, furniture, etc.

9. CONSIDER WORK AREA ENVIRONMENT.

Don't expose power tools to rain. Don't use power tools in damp or wet locations. Keep work area well lit and well ventilated.

Don't use tool in presence of flammable liquids or gases.

Power tools produce sparks during operation. They also spark when switching ON/OFF. Never use power tools in sites containing lacquer, paint, benzine, thinner, gasoline, gases, adhesive agents, and other materials which are combustible or explosive.

10. KEEP CHILDREN AWAY.

Do not let visitors contact tool or extension cord.

All visitors should be kept safely away from work area.

11. DON'T FORCE TOOL.

It will do the job better and safer at the rate for which it was intended.

12. USE RIGHT TOOL.

Don't force small tool or attachment to do the job of a heavy-duty tool.

Don't use tool for purpose not intended—for example—don't use circular saw for cutting tree limbs or logs.

13. DRESS PROPERLY.

Do not wear loose clothing or jewelry. They can be caught in moving parts.

Rubber gloves and non-skid footwear are recommended when working outdoors.

Wear protective hair covering to contain long hair.

14. USE FACE, DUST MASK OR RESPIRATOR IF OPERATION IS DUSTY.

All persons in the area where power tools are being operated should also wear face, dust mask or respirator.

15. DON'T ABUSE CORD.

Never carry tool by cord or yank it to disconnect from receptacle.

Keep cord from heat, oil and sharp edges.

16. SECURE WORK.

Use clamps or a vise to hold work. It's safer than using your hand and it frees both hands to operate tool.

17. DON'T OVERREACH.

Keep proper footing and balance at all times.

18. MAINTAIN TOOLS WITH CARE.

Keep tools sharp and clean for better and safer performance.

Follow instructions for lubricating and changing accessories.

Inspect tool cords periodically and if damaged, have repaired by an authorized service center. Inspect extension cords periodically and replace if damaged.

Keep handles dry, clean, and free from oil and grease.

19. REMOVE ADJUSTING KEYS AND WRENCHES.

Keys and adjusting wrenches remove from tool before turning it on.

20. OUTDOOR USE EXTENSION CORD.

When tool is used outdoors, use only extension cord intended for use outdoors and so marked.

21. STAY ALERT.

Watch what you are doing. Use common sense. Do not operate tool when you are tired. Tools should never be used by you if you are under the influence of alcohol, drugs or medication that makes you drowsy.

22. 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, binding 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 elsewhere in this Instruction Manual.

Have defective switches replaced by the authorized service center.

Do not use tool if switch does not turn it on and off.

1. NEVER USE A POWER TOOL FOR APPLICATIONS OTHER THAN THOSE SPECIFIED.

Never use a power tool for applications other than those specified in the Instruction Manual.

1. HANDLE TOOL CORRECTLY.

Operate the tool according to the instructions provided herein. Do not drop or throw the tool. Never allow the tool to be operated by children, individuals unfamiliar with its operation or unauthorized personnel.

1. CHECK FOR LIVE WIRES.

Avoid the risk of severe electrical shock by checking for live electrical wires that may be buried in walls, floors or ceilings. The wires should be de-energized before work begins.

1. KEEP ALL SCREWS, BOLTS AND COVERS TIGHTLY IN PLACE.

Keep all screws, bolts, and plates tightly mounted. Check their condition periodically.

1. DO NOT USE POWER TOOLS IF THE PLASTIC HOUSING OR HANDLE IS CRACKED.

Cracks in the tool's housing or handle can lead to electric shock. Such tools should not be used until repaired.

1. BLADES AND ACCESSORIES MUST BE SECURELY MOUNTED TO THE TOOL.

Prevent potential injuries to yourself or others. Blades, cutting implements and accessories which have been mounted to the tool should be secure and tight.

1. KEEP MOTOR AIR VENT CLEAN.

The tool's motor air vent must be kept clean so that air can freely flow at all times. Check for dust build-up frequently.

1. OPERATE POWER TOOLS AT THE RATED VOLTAGE.

Operate the power tool at voltages specified on its nameplate.

If using the power tool at a higher voltage than the rated voltage, it will result in abnormally fast motor revolution and may damage the unit and the motor may burn out.

1. NEVER USE A TOOL WHICH IS DEFECTIVE OR OPERATING ABNORMALLY.

If the tool appears to be operating unusually, making strange noises, or otherwise appears defective, stop using it immediately and arrange for repairs by a Hitachi authorized service center.

Don't leave tool until it comes to a complete stop.

1. CAREFULLY HANDLE POWER TOOLS.

Should a power tool be dropped or struck against hard materials inadvertently, it may be deformed, cracked, or damaged.

1. DO NOT WIPE PLASTIC PARTS WITH SOLVENT.

Solvents such as gasoline, thinner benzine, carbon tetrachloride, and alcohol may damage and crack plastic parts. Do not wipe them with such solvents.

Wipe plastic parts with a soft cloth lightly dampened with soapy water and dry thoroughly.

1. USE ONLY GENUINE HITACHI REPLACEMENT PARTS.

Replacement parts not manufactured by Hitachi may void your warranty and can lead to malfunction and resulting injuries. Genuine Hitachi parts are available from your dealer.

IMPORTANT SAFETY INSTRUCTIONS FOR USE OF THE IMPACT WRENCH

⚠ WARNING: Death or serious bodily injury could result from improper or unsafe use of the impact wrench. To avoid these risks, follow these basic safety instructions:

1. When working in high places, check there is nobody below. During operation, take care not to catch or tighten the cord accidentally.
2. Use the earplugs if using for a long time use.
3. Switch the reversing switch only after the motor is stopped when it is necessary to change the direction of the rotation.
4. Use a step up transformer when a long extension cable is used.
5. Confirm the tightening torque by a torque wrench before use in order to ascertain the correct tightening torque to be used.
6. Attach the hex. socket securely onto the anvil. If the hex. socket is insufficiently secured, it may drop out and cause an accident. For hex. socket attachment refer to "PRIOR TO OPERATION" on page 13.
7. Confirm whether the socket has any crack in it.

REPLACEMENT PARTS

When servicing use only identical replacement parts.

Repairs should be conducted only by a Hitachi authorized service center.

POLARIZED PLUGS

To reduce the risk of electric shock, this equipment has a polarized plug (one blade is wider than the other).

This plug will fit in a polarized outlet only one way.

If the plug does not fit fully in the outlet, reverse the plug.

If it still does not fit, contact a qualified electrician to install the proper outlet.

Do not change the plug in any way.

USE OF EXTENSION CORD

Make sure your extension cord is in good condition. When using an extension cord, be sure to use one heavy enough to carry the current your product will draw. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. Table shows the correct size to use depending on cord length and nameplate ampere rating. If in doubt, use the next heavier gage. The smaller the gage number, the heavier the cord.

MINIMUM GAGE FOR CORD SETS

	Total Length of Cord in Feet (Meter)
	0 – 25(0 – 7.6)	26 – 50(7.9 – 15.2)	51 – 100(15.5 – 30.5)	101 – 150(30.8 – 45.7)
Ampere Rating AWGMore Not MoreThan Than
0 – 6	1	8	1	6	1
6 – 10 18 16 14 12
10 – 12	16 16 14 12
12 – 16	14	12	Not Recommended

WARNING: Avoid electrical shock hazard. Never use this tool with a damaged or frayed electrical cord or extension cord.

Inspect all electrical cords regularly. Never use in or near water or in any environment where electric shock is possible.

To ensure safer operation of this power tool, HITACHI has adopted a double insulation design. "Double insulation" means that two physically separated insulation systems have been used to insulate the electrically conductive materials connected to the power supply from the outer frame handled by the operator. Therefore, either the symbol "☐" or the words and "Double insulation" appear on the power tool or on the nameplate.

Although this system has no external grounding, you must still follow the normal electrical safety precautions given in this Instruction Manual, including not using the power tool in wet environments.

To keep the double insulation system effective, follow these precautions:

○Only HITACHI AUTHORIZED SERVICE CENTER should disassemble or assemble this power tool, and only genuine HITACHI replacement parts should be installed.

○Clean the exterior of the power tool only with a soft cloth moistened with soapy water, and dry thoroughly.

Never use solvents, gasoline or thinners on plastic components; otherwise the plastic may dissolve.

SAVE THESE INSTRUCTIONS AND MAKE THEM AVAILABLE TO OTHER USERS OF THIS TOOL!

The information contained in this Instruction Manual is designed to assist you in the safe operation and maintenance of the power tool.

Some illustrations in this Instruction Manual may show details or attachments that differ from those on your own power tool

NAME OF PARTS

Anvil Switch Nameplate Cap Cover Side handle (WH22)

Fig. 1

SPECIFICATIONS

Model WH14 WH16 W	H22
Motor Single-Phase, S	Series Commutator Motor
Power Source Single-Phase, 115V AC 60Hz
Current 4A 5A 10A
No-Load Speed 2100rpm	1700rpm 1600rpm
Capacities	3/8" – 5/8" (M10 – M16)	3/8" – 5/8" (M10 – M16)	5/8" – 7/8" (M16 – M22)
Tightening tightening Torque	147 ft-lbs (20 kg-m) 20 ft-lbs (30 kg-m) 440 ft-lbs (60 kg-m)tightening tighteningM16 · 55 (F10T)(high strength bolt) (high strength bolt) (high strength bolt)	M16 · 55 (F10T)(high strength bolt) (high strength bolt)	M22 · 70 (F10T)
Square Drive	1/2" (12.7 mm)	1/2" (12.7 mm)	3/4" (19 mm)
Weight 5.1 lbs (2.3 kg)	6.4 lbs (2.9 kg)	11 lbs (5 kg)

ACCESSORIES

Accessories for this power tool are mentioned in this Instruction Manual.

The use of any other attachment or accessory can be dangerous and could cause injury or mechanical damage.

STANDARD ACCESSORIES

○ WH22: (1) Side handle (Code No. 985280) .... 1

(2) Hex. socket 32 mm (including pin and ring) (Code No. 874523)....1

(3) Case (Code No. 319896) .... 1

OPTIONAL ACCESSORIES ..... sold separately

1. Variety of sockets

Although the Hitachi Impact Wrench is delivered with only one standard socket, ample sockets are available to cover impact tightening of various sizes and types of bolts.

S L D E B

(1) WH14, WH16:

Table 1 B = 1/2" (12.7 mm)

Socket Designation	Ordinary Socket Long Socket
	Dimension (mm) Dimension (mm)
	S	D	E	L	Code No.	S	D	E	L	Code No.
Hex. Socket 12						12	20	34	52	955138
13						13	21.5	34	52	955139
14	14	25	24	40	873540	14	22	34	52	955140
17	17	28	15	32	873536	17	25	34	52	955141
19	19	28	17	34	873624	19	28	34	52	955142
21	21	32	19	36	873626	21	31	34	52	955143
22	22	35	24	40	873627	22	32.5	34	52	955144
23	23	36	25	40	873628	23	33	34	52	955145
24	24	38	25	40	873629	24	34	34	52	955146
26	26	38	25	40	873630	26	38	57	75	955147
27	27	42	24	40	985195	27	40	57	75	955148
30	30	42	34	50	985196	30	42	57	75	985197

(2) WH22:

Table 2 B = 3/4" (19 mm)

Socket Designation	Ordinary Socket Long Socket
	Dimension (mm) Dimension (mm)
	S	D	E	L	Code No.	S	D	E	L	Code No.
Hex. Socket 22	22	32	32	60	955031
23	23	38	29	55	874527	23	33	32	60	955032
24	24	40	29	55	874528	24	34	32	60	955033
26	26	42	29	55	874529	26	38	57	85	955034
27	27	43	29	55	874530	27	39	57	85	955035
29	29	45	29	55	874531	29	42	57	85	955036
30	30	47	29	55	874532	30	43	57	85	955037
32	32	50	29	55	874523	32	46	72	100	955038
35	35	52	29	55	874533	35	52	72	100	955039
36	36	55	29	55	874534	36	55	72	100	955040

2. Extension bar : Code No. 873633 (WH14, WH16) Code No. 874535 (WH22)

The extension bar is convenient for working in very restricted spaces or when the socket provided cannot reach the bolt to be tightened.

CAUTION:

When the extension bar is used the tightening torque is reduced slightly compared with the ordinary socket. So it is necessary to operate the tool a little longer to get the same torque.

3. Universal joint : Code No. 955135 (WH14) Code No. 955088 (WH22)

The universal joint is convenient for impacting nuts when there is an angle between the socket and wrench, or when working in a very narrow space.

4. Corner attachment (Model EW-14R) (WH14, WH16)

Use this attachment only when the machine is applied to the nut or bolt at a right angle.

Line drawing of a mechanical component with no visible text or symbols

NOTE:

Accessories are subject to change without any obligation on the part of the HITACHI.

APPLICATIONS

○Tightening and loosening various kinds of bolts and nuts

PRIOR TO OPERATION

1. Power source

Ensure that the power source to be utilized conforms to the power source requirements specified on the product nameplate.

2. Power switch

Ensure that the switch is in the OFF position. If the plug is connected to a receptacle while the switch is in the ON position, the power tool will start operating immediately and can cause serious injury.

3. Extension cord

When the work area is far away from the power source, use an extension cord of sufficient thickness and rated capacity. The extension cord should be kept as short as practicable.

⚠ WARNING: Damaged cord must be replaced or repaired.

4. Check the receptacle

If the receptacle only loosely accepts the plug, the receptacle must be repaired. Contact a licensed electrician to make appropriate repairs.

If such a fautly receptacle is used, it may cause overheating, resulting in a serious hazard.

5. Confirming condition of the environment:

Confirm that the work site is placed under appropriate conditions conforming to prescribed precautions.

6. Attacking the side handle

The position of the side handle attached to the hammer case can be changed by unscrewing the handle. (Right hand screw) Turn the handle to the desired position for the job and secure the handle by screwing up tight.

7. Mounting the socket

(1) Pin, O-ring type (WH22) (Fig.2)

Select a socket matched to the bolt to be tightened or loosened. Insert the socket on the anvil of the wrench, and secure it with the pin and ring. When removing the socket, reverse the sequence.

(2) Plunger type (WH14, WH16) (Fig.3)

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.

Hex. socket Ring Anvil Pin

Fig. 2

Hex. socket Hole Plunger Anvil

Fig. 3

HOW TO USE

1. Operation of switch (Fig.4)

The switch in this machine functions as a motor switch and rotational direction selector switch. When the switch is set to R indicated on the handle cover, the motor rotates clockwise to tighten the bolt. When the switch is set to L, the motor rotates counterclockwise to loosen the bolt. When the switch is released, the motor stops.

CAUTION:

Be sure to turn the switch OFF and wait until the motor completely stops before changing the direction of wrench revolution. Switching while the motor is rotating will result in burning the motor.

2. Tightening and loosening bolts

A hex. socket matching the bolt or nut must first be selected. Then mount the socket on the anvil, and grip the nut to be tightened with the hex. socket. Holding the wrench in line with the bolt, press the power switch to impact the nut for several seconds. If the nut is only loosely fitted to the bolt, the bolt may turn with the nut, therefore preventing proper tightening. In this case, stop impact on the nut and hold the bolt head with a wrench before restarting impact, or manually tighten the bolt and nut to prevent them slipping.

OPERATIONAL CAUTIONS

1. Confirm the line voltage (Figs.5, 6, 7, 8 and 9)

The available tightening torque is influenced by line voltage. Reduced line voltage lowers the available tightening torque.

For example, if you use a 115 V type wrench on a 105 V line the available tightening torque will be reduced to 70 to 90%. When extending the power cord, use an extension cord which is as short as possible. When the line voltage is low and a long extension cord is needed a step up transformer should be used. The relation between the line voltage and the tightening torque are shown in the figures.

Switch

Fig. 4

Fig. 5

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

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

3. Selecting the socket to be matched to the bolt

Be sure to use a socket which is matched to the bolt to be tightened. Using an improper socket will result not only 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 holes, and replace before further wear has developed. Matching socket and bolt sizes are shown in Tables 1 and 2.

The numerical value of a socket designation denotes the side-to-side distance (S) of its hex. hole.

4. Holding the tool

Hold the Impact Wrench firmly with both hands by the body handle and the side handle. 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.

5. 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) Line voltage:

The tightening torque decreases when the line voltage becomes low. (See Figs. 5, 6, 7, 8 and 9)

Fig. 6

Fig. 7

Fig. 8

(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 Figs. 5, 6, 7, 8 and 9)

(3) Diameter of bolt:

The tightening torque differs with the diameter of the bolt as shown in Figs. 5, 6, 7, 8 and 9. Generally a larger diameter bolt has a 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 metal through which the bolts are to be tightened.

(5) Using optional parts:

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

(6) Clearance of the socket:

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. Matching socket and bolt sizes are shown in Tables 1 and 2.

Fig. 9

MAINTENANCE AND INSPECTION

WARNING: Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection.

1. Inspecting the socket

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. Pay attention to wear of socket holes periodically, and replace with a new one if needed.

1. Inspecting the mounting screws

Regularly inspect all mounting screws and ensure that they are properly tightened. Should any of the screws be lossened, retighten them immediately.

WARNING: Using this impact wrench with loosened screws is extremely dangerous.

1. Inspecting the carbon brushes (Fig. 10) The motor employs carbon brushes which are consumable parts. Replace the carbon brush with a new one when it becomes worn to its wear limit. Always keep carbon brushes clean and ensure that they slide freely within the brush holders.

⚠️ CAUTION : Using this impact wrench with a carbon brush which is worn in excess of the wear limit will damage the motor.

NOTE: Use HITACHI carbon brush number indicated in Fig. 10.

1. Replacing carbon brushes

To replace carbon brushes, use a slotted head screwdriver to disassemble the brush caps after disassembling the cap covers. Then remove the carbon brushes together with the spring.

When assembling, reverse the procedure for disassembling. In this case assemble the cap covers after screwing up the brush caps firmly.

(WH14,WH16) Wear limit 21 0.20" (5mm) 0.47" (12mm) No. of carbon brush

(WH22)

Wear limit 43 0.24" (6mm) 0.67" (17mm) No. of carbon brush

Fig. 10

SERVICE AND REPAIRS

All quality power tools will eventually require servicing or replacement of parts because of wear from normal use. To assure that only authorized replacement parts will be used, all service and repairs must be performed by a HITACHI AUTHORIZED SERVICE CENTER, ONLY.

NOTE:

Specifications are subject to change without any obligation on the part of the HITACHI.

INFORMATIONS IMPORTANTES

S D E L B

(1) WH14, WH16:

Table 1 B = 1/2" (12,7 mm)

Désignation de douille	Douille ordinaire Douille longue
	Dimensions (mm) Dimensions (mm)
	S	D	E	L	No. de code	S	D	E	L	No. de code
Douille six pans 12						12	20	34	52	955138
13						13	21,5	34	52	955139
14	14	25	24	40	873540	14	22	34	52	955140
17	17	28	15	32	873536	17	25	34	52	955141
19	19	28	17	34	873624	19	28	34	52	955142
21	21	32	19	36	873626	21	31	34	52	955143
22	22	35	24	40	873627	22	32,5	34	52	955144
23	23	36	25	40	873628	23	33	34	52	955145
24	24	38	25	40	873629	24	34	34	52	955146
26	26	38	25	40	873630	26	38	57	75	955147
27	27	42	24	40	985195	27	40	57	75	955148
30	30	42	34	50	985196	30	42	57	75	985197

(2) WH22:

Table 2 B = 3/4" (19 mm)

Désignation de douille	Douille ordinaire Douille longue
	Dimensions (mm) Dimensions (mm)
	S	D	E	L	No. de code	S	D	E	L	No. de code
Douille six pans22	22	32	32	60	955031
23	23	38	29	55	874527	23	33	32	60	955032
24	24	40	29	55	874528	24	34	32	60	955033
26	26	42	29	55	874529	26	38	57	85	955034
27	27	43	29	55	874530	27	39	57	85	955035
29	29	45	29	55	874531	29	42	57	85	955036
30	30	47	29	55	874532	30	43	57	85	955037
32	32	50	29	55	874523	32	46	72	100	955038
35	35	52	29	55	874533	35	52	72	100	955039
36	36	55	29	55	874534	36	55	72	100	955040

2. Barre de rallonge : No. de Code 873633 (WH14, WH16)

No. de Code 874535 (WH22)

Line drawing of a mechanical component with no visible text or symbols

REMARQUE:

S D E L B

(1) WH14, WH16:

Tabla 1 B = 1/2" (12,7 mm)

Designación del receptáculo	Receptáculo ordinario Receptáculo					argo
	Dimensión (mm)					Dimensión (mm)
	S	D	E	L	Núm. de código	S	D	E	L	Núm. de código
Receptáculo hexagonal 12						12	20	34	52	955138
13						13	21,5	34	52	955139
14	14	25	24	40	873540	14	22	34	52	955140
17	17	28	15	32	873536	17	25	34	52	955141
19	19	28	17	34	873624	19	28	34	52	955142
21	21	32	19	36	873626	21	31	34	52	955143
22	22	35	24	40	873627	22	32,5	34	52	955144
23	23	36	25	40	873628	23	33	34	52	955145
24	24	38	25	40	873629	24	34	34	52	955146
26	26	38	25	40	873630	26	38	57	75	955147
27	27	42	24	40	985195	27	40	57	75	955148
30	30	42	34	50	985196	30	42	57	75	985197

(2) WH22:

Tabla 2 B = 3/4" (19 mm)

Designación del receptáculo	Receptáculo ordinario Receptáculo largo
	Dimensión (mm)					Dimensión (mm)
	S	D	E	L	Núm. de código	S	D	E	L	Núm. de código
Receptáculo hexagonal 22	22	32	32	60	955031
23	23	38	29	55	874527	23	33	32	60	955032
24	24	40	29	55	874528	24	34	32	60	955033
26	26	42	29	55	874529	26	38	57	85	955034
27	27	43	29	55	874530	27	39	57	85	955035
29	29	45	29	55	874531	29	42	57	85	955036
30	30	47	29	55	874532	30	43	57	85	955037
32	32	50	29	55	874523	32	46	72	100	955038
35	35	52	29	55	874533	35	52	72	100	955039
36	36	55	29	55	874534	36	55	72	100	955040

Line drawing of a mechanical component with no visible text or symbols

NOTA:

Interruptor L R L R

Fig. 4

PRECAUCIÓN:

Exploded view diagram of a mechanical assembly with numbered parts for identification

WH16

Item No.	Part Name
1 Bumper
2 0-Ring (1AP-20)
3 Hammer Case Ass'y
4 Anvil (B) Ass'y
5 Steel Ball D6.35
6 Hammer
7 Spring
8 Spring Seat
9 Steel Ball D3.175
10 Needle Roller
11 Spindle
12 Idle Gear
13 Ring Gear
14A Ball Bearing (6908ZZC2PS2S)
15 Inner Cover
16 Felt Packing
17 Packing Washer
18 Ball Bearing (6000VVCMPS2S)
19 Armature
20 Fan Guide
21 Stator Ass'y
22 Internal Wire
23 HITACHI Label
24A Housing Ass'y
25 Nameplate
29A	Hex. Socket Hd. Bolt (W/Flange) M5 · 45
30 Internal Wire
31 Terminal (A) M3.5
32 Hex. Hd. Tapping Screw D4 · 45
33 Special Washer
36A Tapping Screw (W/Flange) D4 · 16
37 Cord Clip
38 Cord Armor
39 Cord
40 Tapping Screw D4 · 10

Item No.	Part Name
41 Cap Cover
42 Brush Cap
43 Carbon Brush
44 Brush Holder
45A Hex. Socket Set Screw M5 · 8
46 Ball Bearing (608VVMC2EPS2L)
47 Rubber Washer
48 Tail Cover
49 Spling Washer M4
50 Tapping Screw D4 · 16
51 Tapping Screw D4 · 35
52 Washer M4
53 Handle Cover
54 Switch
55 Switch Adapter
56	Machine Screw (W/Washer) M3.5 · 5
57 Switch Holder
67 Plunger
68 Pin Retainer

Parts are subject to change without any obligation on the part of the HITACHI due to improvements.

WH22

Exploded view diagram of a mechanical assembly with numbered parts and exploded views

WH22

Item No.	Part Name
1 Bumper
2 0-Ring (1AP-28)
3A Hammer Case Ass'y
4 Washer (A)
5 Anvil (A)
6 Steel Ball D7.14
7 Hammer
8 Spring
9 Spring Seat
10 Steel Ball D3.97
11 Gear Shaft
12 Spindle (B)
13A Idle Gear Set
14 Clip (A)
15B Ring Gear
16A Ball Bearing (6910ZZC2PS2S)
17 Inner Cover
18 Felt Packing
19 Packing Washer
20 Ball Bearing (6200VVCMPS2S)
21 Armature
22 Fan Guide
23 Stator Ass'y
24 Internal Wire
25 HITACHI Label
26 Collar
27A Housing Ass'y
28 Nameplate
32A	Hex. Socket Hd. Bolt (W/Flange) M5 · 60
33 Hex. Hd. Tapping Screw D5 · 70
34 Special Washer
37	Tapping Screw (W/Washer) D4 · 16
38 Cord Clip
39 Cord Armor
40 Cord

Item No.	Part Name
41 Internal Wire
42 Terminal (A) M3.5
43 Tapping Screw D4 · 35
44 Washer M4
45A Handle Cover
46 Switch
47 Switch Adapter
48 Machine Screw (W/Washer)
49 Switch Holder
52 Tapping Screw M4 · 10
53 Cap Cover
54 Brush Cap
55 Carbon Brush
56 Brush Holder
57 Hex. Socket Set Screw M5 · 8
58 Ball Bearing (608VVMC2EPS2L)
59 Tail Cover
60 Tapping Screw D5 · 25
501 Hex. Socket Ass'y 32MM · 55L
502 Socket Pin
503 Socket Ring
504 Side Handle Ass'y
505 Side Handle
506 Handle Base
507 Ring
508 Square Bolt M8
509B Case

Parts are subject to change without any obligation on the part of the HITACHI due to improvements.

Line drawing of a quill pen in an inkwell (no text or symbols)

Line drawing of a quill pen in an inkwell (no text or symbols)

WARNING:

Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:

• Lead from lead-based paints,
  ●Crystalline silica from bricks and cement and other masonry products, and
  ●Arsenic and chromium from chemically-treated lumber.

Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.

AVERTISSEMENT:

Minato-ku, Tokyo 108-6020, Japan

Distributed by

Hitachi Koki U.S.A., Ltd.

3950 Steve Reynolds Blvd.

Norcross, GA 30093

Hitachi Koki Canada Co.

6395 Kestrel Road

Mississauga ON L5T 1Z5

103

Code No. 99509264 N

Printed in Japan