Operational Cautions - Hitachi WR 12DAF Handling Instructions Manual

English
(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. 9).
(b) Remove the hook and spring (Fig. 10).
(c) Install the hook and spring on the other side and
securely fasten with screw (Fig. 11).
NOTE
Pay attention to the spring orientation. Install the
spring with larger diameter away from you (Fig. 11).
(3) Using the bit holder
Installing the bit
Slide the bit from the side in the direction of Fig.
12, and then insert firmly until the groove on the
bit locks in the protruded section of the hook.
Removing the bit
Securely hold the main unit and pull out the bit by
holding the tip with your thumb (Fig. 13).
CAUTION
The socket may come loose from the hook and cause
bodily injury when reversing the direction of the bit
as shown in Fig. 12 or when using the wrench with
the bit stored incomplete.
Only Hitachi OPTIONAL ACCESSORIES plus driver bits
(Bit No. 2; Code No. 992671, Bit No. 3; Code No.
992672) may be used. Do not use other bits since they
may come loose.
2. Check the rotational direction
The socket 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. 14) (The
are provided on the body.).
CAUTION
The push button can not be switched while the impact
wrench is turning. To switch the push button, stop
the impact wrench, then set the push button.
3. Switch operation
When the trigger switch is depressed, the tool rotates.
When the trigger is released, the tool stops.
The rotational speed can be controlled by varying the
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.
4. 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 wit the nut, therefore mistaking 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.
5. Number of bolt tightened possible
Please refer to the table below for the number of bolt
tightened possible with one charge.
11
EB1220BL
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.

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 tightening in bolts, the components of
the electronic circuit parts may overheat and be
R
L
and marks
damaged.
3. Tightening torque
Refer to Fig. 15 for the tightening torque of bolts
(according to size), under the conditions shown in Fig.
16. Please use this example as a general reference,
as tightening torque will vary according to tightening
conditions.
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 proportionate to the operaton time. Use
the correct operating time for the bolt.
5. 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.
6. 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.
Bolt used
High tension bolt
M12 × 45
No. of tightenings
Approx. 170