Hitachi Koki DV 12DV Mode D'emploi page 9

6. How to select tightening power and rotational speed
Use
Machine screw
Driving
Wood screw
Brick
Drilling Wood
Metal
CAUTION
The selection examples shown in Table 2 should
be considered as general standard. As different
types of tightening screws and different materials
to be tightened are used in actual works proper
adjustments are naturally necessary.
When using the impact drill with a machine screw
at HIGH (high speed), a screw may damage or a
bit may loose due to the tightning torque is too
strong. Use the impact drill at LOW (low speed)
when using a machine screw.
7. Mounting and dismounting of the bit.
(1) Mounting the bit
After inserting a driver bit, etc. into the keyless drill
chuck, firmly grasp the ring and tighten the sleeve
by turning it toward the right (in the clockwise
direction as viewed from the front). (See Fig. 8)
If the sleeve becomes loose during operation, tighten
it further. The tightening force becomes stronger
when the sleeve is tightened additionally.
(2) Dismounting the bit
Firmly grasp the ring and loosen the sleeve by
turning it toward the left (in the counter-clockwise
direction as viewed from the front). (See Fig. 8)
CAUTION:
When it is no longer possible to loosen the sleeve,
use a vise or similar instrument to secure the bit.
Set the clutch mode between 1 and 11 and then
turn the sleeve to the loose side (left side ) while
operating the clutch. It should be easy now to
loosen the sleeve.
NOTE
There is a plus driver bit on side of the main unit.
The bit can be removed by pulling it forward. After
using the bit, make sure to firmly attach it to the
main body again.
8. Confirm that the battery is mounted correctly.
9. Check the rotational direction
The bit rotates clockwise (viewed from the rear
side) by pushing the R-side of the selector button.
The L-side of the selector button is pushed to turn
the bit counterclockwise. (See Fig. 9). (The
marks are provided on the body.)
CAUTION:
Always use this unit with clockwise rotation, when
using it as an impact drill.
Table 2
Rotating speed selection (Position of the shift knob)
Cap Position
LOW (Low speed)
For 4 mm or smaller
1 — 22
diameter screw.
For 5.1 mm or smaller
1 —
nominal diameter screw.
For 18 mm or smaller
diameters.
For drilling with a
metal working drill bit
10. Switch operation
When the trigger switch is depressed, the tool
rotates. When the trigger is released, the tool stops.
The rotational speed of the drill can be controlled
by varying the amount that the trigger is pulled.
Speed is low when the trigger switch is pulled
slightly and increases as the trigger switch is pulled
more.
NOTE
A buzzing noise is produced when the motor is
about to rotate; This is only a noise, not a machine
failure.
11. For drilling into brick
Excessive pressing force never increases drilling
speed. It will not only damage the drill tip or reduce
working efficiency, but could also shorten the service
life of drill bit. Operate the impact drill within 10-
15 kg pressing force while drilling into brick.
12. Using the hook
The provided hook is so designed that it can be
installed and removed on either right or left by one
touch.
Use it correctly as occasion demands.
(1) Installing the hook
To begin with, remove the battery from the tool.
Subsequently, insert the hook so that the grooves
at 2 locations of the hook and the 2 protrusions
of the hook installing part of the tool come together,
check and confirm that the hook is securely fixed,
and then install the battery. (See Figs. 10 and 11)
(2) Removing the hook
Remove the hook following the order of installation
in reverse.
CAUTION
Fix the hook securely before use.
imperfect installation of the hook as is can result
in injuries.
When you use the hook, be absolutely sure that
it is in a state where the battery is installed. If you
use it in a state where the battery is removed, the
hook can come off or drop and result in injuries.
and When you carry it hanging on a waist belt, do not
install it on the drill chuck, but you can do so on
the driver bit.
point are installed, injuries can result.
HIGH (High speed)
For 6 mm or smaller
diameter screw.
For 3.8 mm or smaller
nominal diameter screw.
For drilling with a
———
carbide tipped drill bit.
For 18 mm or smaller
diameters.
If drills and the like with a sharp
English
———
Any use with
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