Hitachi DH24PC Handling Instructions Manual page 20

APPLICATIONS
Rotation and striking function
Drilling anchor holes
Drilling holes in concrete
Drilling holes in tile
Rotation only function
Drilling in steel or wood
(with optional accessories)
Tightening machine screws, wood screws
(with optional accessories)
Striking only function
Light-duty chiselling of concrete, groove digging and
edging.
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. Mounting the drill bit (Fig. 1)
(1) To attach a drill bit (SDS-plus shank), fully pull the
grip in the direction of the arrow as shown in Fig. 1
and insert the drill bit as far as it will go while manually
turning.
(2) By releasing the grip, the drill bit will be secured.
(3) To remove the drill bit, fully pull the grip in the
direction of the arrow and pull out the drill bit.
5. Installation of dust cup or dust collector (B)
(Optional accessories) (Fig. 2, Fig. 3)
When using a hammer drill for upward drilling
operations attach a dust cup or dust collector (B) to
collect dust or particles for easy operation.
Installing the dust cup
Use the dust cup by attaching to the drill bit as shown
in Fig. 2.
When using a bit which has big diameter, enlarge the
center hole of the dust cup with this hammer dirll.
Installing dust collector (B)
When using dust collector (B), insert dust collector
(B) from the tip of the bit by aligning it to the groove
on the grip. (Fig. 3)
CAUTION:
The dust cup and dust collector (B) are for exclusive
use of concrete drilling work. Do not use them for
wood or metal drilling work.
Insert dust collector (B) completely into the chuck
part of the main unit.
When turning the hammer drill on while dust collector
(B) is detached from a concrete surface, dust collector
(B) will rotate together with the drill bit. Make sure to
turn on the switch after pressing the dust cup on the
concrete surface. (When using dust collector (B)
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attached to a drill bit that has more than 190 mm of
overall length, dust collector (B) cannot touch the
concrete surface but rotates. Therefore please use
dust collector (B) by attaching to drill bits which have
166 mm, 160 mm, and 110 mm overall length.
Dump particles after every two or three holes when
drilling.
Please replace the drill bit after removing dust
collector (B).
6. Selecting the driver bit
Screw heads or bits will be damaged should an
inappropriate for the screw diameter be employed to
drive in the screws.
7. Confirm the direction of bit rotation (Fig. 4)
The bit rotates clockwise (viewed from the rear side)
by pushing the R-side of the reversing switch lever.
The L-side of the lever 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 pits 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.
2. Rotation + striking
This hammer drill can be set to rotation and striking
mode by pressing the push button and turning the
change lever fully counterclockwise to the
(Fig. 5)
(1) Mount the drill bit.
(2) Pull the trigger switch after applying the drill bit tip to
the drilling position. (Fig. 6)
(3) Pushing the hammer drill forcibly is not necessary at
all. Pushing slightly so that drill dust comes out
gradually is sufficient.
CAUTION:
When the drill bit touches construction iron bar, the
bit will stop immediately and the hammer drill will
react to revolve. Therefore grip the side handle and
handle tightly as shown in Fig. 6.
3. Rotation only
This hammer drill can be set to rotation only mode
by pushing the push button and turning the change
lever to the mark. (Fig. 7)
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. 8)
(1) Mount 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.
mark.