Manual Hitachi WH14DBL (page 10 of 60) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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English

⅜ Do not use the angle impact driver with the lock

button in an intermediate position. If used with the

lock button in an intermediate position, the switch

may suddenly be turned off while working or suddenly

come on when carrying. When changing the position

of the lock button, slide the lock button until it reliably

reaches and contacts the ON position or OFF position.

⅜ Do not change the position of the lock button while

the switch lever is being pulled. Only change the

position of the lock button after having first released

the switch lever.

⅜ Do not place the angle impact driver in a manner

such that the switch lever is facing downward. This

can cause the switch to be turned on as a result of

pressing the switch lever.

⅜ Do not move the switch lever in the direction opposite

that of the angle impact driver. This can cause a

malfunction.

6. Tightening and loosening screws

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 angle impact driver just enough to keep the

bit fitting the head of the screw.

CAUTION

Applying the angle impact driver for too long tightens

the screw too much and can break it.

Tightening a screw with the angle 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 angle impact driver lined up straight

with the screw.

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 they get 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. 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.

4. 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 operation time. Use

the correct operating time for the bolt.

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) 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.

(3) Diameter of bolt

The tightening torque differs with the diameter of the

bolt. 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.

MAINTENANCE AND INSPECTION

1. Inspecting the driver bit

Using a broken bit or one with a worn out tip is

dangerous because the bit can slip. Replace it.

2. Inspecting the mounting screws

Regularly inspect all mounting screws and ensure

that they are properly tightened. Should any of the

screws be loose, retighten them immediately. Failure

to do so could result in serious hazard.

3. Maintenance of the motor

The motor unit winding is the very “heart” of the

power tool.

Exercise due care to ensure the winding does not

become damaged and/or wet with oil or water.

4. Cleaning of the outside

When the angle impact driver is stained, wipe with a

soft dry cloth or a cloth moistened with soapy water.

Do not use chloric solvents, gasoline or paint thinner,

for they melt plastics.

5. Storage

Store the angle impact driver in a place in which the

temperature is less than 40°C and out of reach of children.

6. Service parts list

CAUTION

Repair, modification and inspection of Hitachi Power

Tools must be carried out by a Hitachi Authorized

Service Center.

This Parts List will be helpful if presented with the

tool to the Hitachi Authorized Service Center when

requesting repair or other maintenance.

In the operation and maintenance of power tools,

the safety regulations and standards prescribed in

each country must be observed.

MODIFICATIONS

Hitachi Power Tools are constantly being improved

and modified to incorporate the latest technological

advancements.

Accordingly, some parts may be changed without

prior notice.

01Eng_WH14DCAL_WE 08/8/27, 18:229

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Hitachi WH14DBL Manual

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