Hitachi WH 18DBDL Скачать руководство пользователя

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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.

CAUTION
Do not touch the metal parts, 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. 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 5/16” (8 mm), 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.

(5) Using optional parts (WR18DBDL)

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

(6) Clearance of the socket (WR18DBDL)

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.

Low 1

Low 2

Medium

High

Rotation speed

900 /min

1,400 /min

2,000 /min

2,600 /min

Single/
Continuous