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Hitachi WR 16 SA Manual

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25
2. Extension bar
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
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)
Use this attachment only when the machine is applied
to the nut or bolt at the right angle.
Optional accessories are subject to change without notice.
APPLICATIONS
⅜ Tightening and loosening various kinds of bolt and
nut.
PRIOR TO OPERATION
1. Power source
Ensure that the power source to be utilized conforms
to the power requirements specified on the product
nameplate.
2. Power switch
Ensure that the power switch is in the OFF position. If
the plug is connected to a power receptacle while the
power switch is in the ON position, the power tool
will start operating immediately, which could cause a
serious accident.
3. Extension cord
When the work area is removed from the power
source, use an extension cord of sufficient thickness
and rated capacity. The extension cord should be
kept as short as practicable.
4. Fixing 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.
5. Mounting the socket
(1) Pin, O-ring type (Fig. 1)
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 dismantling
the socket, reverse the sequence.
(2) Plunger type (Fig. 2)
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
1. Operation of switch (Fig. 3)
The switch in this machine functions as a motor switch
and rotational direction selector switch. When the switch
is set to R indicated in 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. 4)
The available tightening torque is influenced by line
voltage. Reduced line voltage lowers the available
tightening torque.
For example, if you use a 220 V type wrench on a
200 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.
2. Do not touch the bumper or hammer case during
continuous operation
The bumper and hammer case become hot during
continuous screw tightening so be careful not to
touch them at that time.
3. 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 strech or break the bolt. The tightening
torque increases proportionally to the operating time.
Use the correct operating time for the bolt.
… 26 …


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