Hitachi Koki DH 24PB3 Instrucciones De Manejo página 10

English
6. Selecting the driver bit
Screw heads or bits will be damaged unless a bit
appropriate for the screw diameter is employed to
drive in the screws.
7. Confi rm the direction of bit rotation (Fig. 5)
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.
HOW TO USE
CAUTION
To prevent accidents, make sure to turn the switch
off and disconnect the plug from the receptacle when
the drill bits and other various parts are installed or
removed. The power switch should also be turned
off during a work break and after work.
1. Switch operation
The rotation speed of the drill bit can be controlled
steplessly by varying the amount that the trigger
switch is pulled. Speed is low when the trigger
switch is pulled slightly and increases as the switch
is pulled more. Continuous operation may be
attained by pulling the trigger switch and depressing
the stopper. To turn the switch OFF, pull the trigger
switch again to disengage the stopper, and release
the trigger switch to its original position.
However, the switch trigger can only be pulled in
halfway during reverse and rotates at half the speed
of forward operation.
The switch stopper is unusable during reverse.
2. Rotation + hammering
This rotary hammer can be set to rotation and
hammering mode by pressing the push button and
turning the change lever to the
(1) Mount the drill bit.
(2) Pull the trigger switch after applying the drill bit tip
to the drilling position (Fig. 7).
(3) Pushing the rotary hammer forcibly is not necessary
at all. Pushing slightly so that drill dust comes out
gradually is suffi cient.
CAUTION
When the drill bit touches construction iron bar, the
bit will stop immediately and the rotary hammer will
react to revolve. Therefore grip the side handle and
handle tightly as shown in Fig. 7.
3. Rotation only
This rotary hammer can be set to rotation only mode
by pressing the push button and turning the change
lever to the mark (Fig. 8).
To drill wood or metal material using the drill chuck
and chuck adapter (optional accessories), proceed as
follows.
Installing drill chuck and chuck adapter (Fig. 9).
(1) Attach the drill chuck to the chuck adapter.
(2) The part of the SDS-plus shank is the same as the
drill bit. Therefore, refer to the item of "Mounting the
drill bit" for attaching it.
CAUTION
○ Application of force more than necessary will not
only expedite the work, but will deteriorate the tip
edge of the drill bit and reduce the service life of the
rotary hammer in addition.
○ Drill bits may snap off while withdrawing the rotary
hammer from the drilled hole. For withdrawing, it is
important to use a pushing motion.
○ Do not attempt to drill anchor holes or holes in
concrete with the machine set in the rotation only
function.
9
○ Do not attempt to use the rotary hammer in the
rotation and striking function with the drill chuck
and chuck adapter attached. This would seriously
shorten the service life of every component of the
machine.
4. When driving machine screws (Fig. 10)
First, insert the bit into the socket in the end of chuck
adapter (D).
Next, mount chuck adapter (D) on the main unit
using procedures described in 4 (1), (2), (3), put the
tip of the bit in the slots in the head of the screw,
grasp the main unit and tighten the screw.
CAUTION
○ Exercise care not to excessively prolong driving time,
otherwise, the screws may be damaged by excessive
force.
○ Apply the rotary hammer perpendicularly to the
screw head when driving the screw; otherwise, the
screw head or bit will be damaged, or driving force
will not be fully transferred to the screw.
○ Do not attempt to use the rotary hammer in the
rotation and hammering function with the chuck
adapter and bit attached.
5. When driving wood screws (Fig. 10)
(1) Selecting a suitable driver bit
Employ plus-head screws, if possible, since the
driver bit easily slips off the heads of minus-head
screws.
(2) Driving in wood screws
○ Prior to driving in wood screws, make pilot holes
suitable for them in the wooden board. Apply the
bit to the screw head grooves and gently drive the
screws into the holes.
○ After rotating the rotary hammer at low speed for a
while until the wood screw is partly driven into the
wood, squeeze the trigger more strongly to obtain
mark (Fig. 6).
the optimum driving force.
CAUTION
Exercise care in preparing a pilot hole suitable for
the wood screw taking the hardness of the wood into
consideration. Should the hole be excessively small
or shallow, requiring much power to drive the screw
into it, the thread of the wood screw may sometimes
be damaged.
6. Using depth gauge (Fig. 11)
(1) Loosen the knob on the side handle, and insert the
depth gauge into the mounting hole on the side
handle.
(2) Adjust the depth gauge position according to the
depth of the hole and thighten the knob securely.
7. How to use the drill bit (taper shank) and the taper
shank adapter
(1) Mount the taper shank adapter to the rotary hammer
(Fig. 12).
(2) Mount the drill bit (taper shank) to the taper shank
adapter (Fig. 12).
(3) Turn the switch ON, and drill a hole in prescribed
depth.
(4) To remove the drill bit (taper shank), insert the cotter
into the slot of the taper shank adapter and strike the
head of the cotter with a hammer supporting on a
rests (Fig. 13).