Prior To Operation; How To Use - Hitachi Koki DH 24PH Handling Instructions Manual

APPLICATIONS
Rotation and hammering 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)
Hammering 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 specifi ed 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 suffi cient thickness and rated
capacity. The extension cord should be kept as short as
practicable.
4. Mounting the drill bit (Fig. 1)
CAUTION
To prevent accidents, make sure to turn the switch off
and disconnect the plug from the receptacle.
NOTE
When using tools such as bull points, drill bits, etc.,
make sure to use the genuine parts designated by our
company.
(1) Clean the shank portion of the drill bit.
(2) Insert the drill bit in a twisting manner into the tool holder
until it latches itself (Fig. 1).
(3) Check the latching by pulling on the drill bit.
(4) To remove the drill bit, fully pull the grip in the direction of
the arrow and pull out the drill bit (Fig. 2).
5. Installation of dust cup or dust collector (B)
(Optional accessories) (Fig. 3, Fig. 4)
When using a rotary hammer 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. 3.
When using a bit which has big diameter, enlarge the
center hole of the dust cup with this rotary hammer.
○ 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. 4).
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 rotary hammer 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) attached to
a drill bit that has more than 190 mm of overall length,
dust collector (B) cannot touch the concrete surface and
will rotate. 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 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 mark (Fig. 6).
(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)
English
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