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Hitachi WR8DH Manual

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9
English
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 hole, and replace
before further wear has developed.
Finally, install the socket prescribed in Item 4. The
section on “Optional Accessories” details the
relationship between bolt sizes and sockets. Sockets
are named according to the dihedral width of the
hexagonal hole.
4. Installing a socket
Select the socket to be used.
䢇 Pin, O-ring type (Fig. 4 and 5)
(1) Align the hole in the socket with the hole in the
anvil and insert the anvil into the socket.
(2) Insert the pin into the socket.
(3) Attach the ring to the groove on the socket.
䢇 Plunger type (Fig. 6)
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. Check the rotational direction
The bit 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. 7). (The
L
and
R
marks are engraved on the body.)
CAUTION
The push button can not be switched while the
impact driver is turning. To switch the push button,
stop the impact driver, then set the push button.
2. Switch operation
䡬 When the trigger switch is depressed, the tool
rotates. When the trigger is released, the tool stops.
䡬 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.
3. 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.
4. Number of bolt tightened possible
(with one charge (EB9B))
Please refer to the table below for the number of
bolt tightened possible with one charge.
These values may vary slightly, according to
surrounding temperature and battery characteristics.
NOTE
The use of the battery EB9H 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.
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Fig. 12
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Fig. 13
Tightening time: sec
(Steel plate thickness
t = 25 mm)
Fig. 14
Tightening torque
Tightening torque
Tightening torque
0
0123
200
400
600
800
1000
kg–cm
M8 × 30
0
0123
200
400
600
800
1000
kg–cm
M10 × 30
0
0123
200
400
600
800
1000
1200
kg–cm
M12 × 45
High tension bolt
Ordinary bolt
High tension bolt
Ordinary bolt
High tension bolt
Ordinary bolt
Bolt used No. of tightenings
High tension bolt
Approx. 120
M12 × 45
… 10 …


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