Hitachi Koki DH 28PD Bedienungsanleitung Seite 14

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(3) Drilling holes
When drilling holes, hold the rotary hammer so that
the tip of the nozzle contacts with the concrete surface.
Dust-collecting effectiveness is reduced if the unit is
not in contact with the surface (Fig. 12).
(4) Removing dust
Excessive dust in the dust box will reduce dust-
collecting effectiveness. Empty the dust box regularly.
Dust box capacity
Guide to replacement of dust box
(5) Replacing the rubber cap
Wear of the rubber cap will reduce dust-collecting
effectiveness.
Replace the rubber cap when it becomes worn.
How to replace the rubber cap (Fig. 14)
(1) Remove the nozzle seal from the nozzle.
(2) Replace the rubber cap with a new cap.
Fit the rubber cap making sure that it is correctly
oriented.
(3) Attach the nozzle seal.
Insert the lip of the nozzle seal securely into the
groove of the nozzle.
At this time, make sure that the groove between the
nozzle and the nozzle seal is uniform all the way
round.
4. When not using the dust-collecting unit
When using the rotary hammer without the dust-
collecting unit, attach the provided cover in the unit
attachment hole (Fig. 15).
CAUTION
If no cover is attached, dust or other particles may be
sucked up from the hole, causing damage to the
motor.
5. Rotation only
NOTE:
The dust-collecting unit cannot be used. Remove the
unit and attach the provided cover in the unit
attachment hole.
CAUTION
If no cover is attached, dust or other particles may be
sucked up from the hole, causing damage to the
motor.
This rotary hammer can be set to rotation only mode
by pressing the push button and turning the change
lever to the mark. (Fig. 16)
Turn the grip slightly and confirm that the clutch has
been engaged with a click.
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. 17)
(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.
13
Push the lever to remove the dust box from the dust-
collecting unit, and empty and clean the box (Fig. 13).
Dust-collecting effectiveness is reduced if the filter in
the dust box becomes blocked.
Use the table below as a guide to replacement of the
dust box.
Drill diameter of 6 mm / depth of 28 mm: 130 holes
Drill diameter of 8 mm / depth of 30 mm: 75 holes
Drill diameter of 12 mm / depth of 50 mm: 20 holes
Dust box has been filled and emptied 100 times
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.
Do not attempt to use the rotary hammer in the
rotation and hammering function with the drill chuck
and chuck adapter attached. This would seriously
shorten the service life of every component of the
machine.
6. When driving machine screws (Fig. 18)
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.
7. When driving wood screws (Fig. 18)
(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
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.