How To Use - Hitachi Koki DH 28PD Mode D'emploi

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. Confirm 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.
8. Selecting the function mode
You can switch functions to the 3 modes of
"hammering only, "rotation + hammering", and
"rotation only" by turning the change lever while
pressing the push button. Set the ▲ mark position of
the change lever to that of the mode to be used.
CAUTION:
Before operating the change lever, check and make
sure that the motor has stopped.
A failure can occur if it is operated while the motor is
running.
To operate the change lever, press the push button,
and release the lock of the change lever. Also, check
and make sure after operation that the push button
has returned and that the change lever has been
locked.
Switch the change lever without mistake. If it is used
at a position halfway, there is a fear that the service
life of the switching mechanism may be shortened.

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.
NOTE
Ensure that the wing bolt in the side handle is properly
tightened before using the tool.
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.
However, the switch trigger can only be pulled in
halfway during reverse and rotates at half the speed
of forward operation.
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
Turn the grip slightly and confirm that the clutch has
been engaged with a click.
(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 sufficient.
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. Using the dust-collecting unit
Using the rotary hammer with the dust-collecting
unit attached creates a more hygienic working
environment free of flying dust (Fig. 8).
(1) Attaching the dust-collecting unit
Insert the dust-collecting unit along the rail on the
rotary hammer. When it is inserted as far as it will go,
fix it to the rotary hammer with the two latches (Fig.
9).
CAUTION:
The dust-collecting unit is designed for use when
drilling concrete. Do not use for drilling holes in
metal or wood.
(2) Adjusting the dust-collecting unit
(a) Adjusting the position of the dust-collecting nozzle
Push the nozzle in and adjust to the desired
position. Pull the adjuster on the nozzle in the
direction of the arrow to release the lock and
move until it contacts with the adjuster rod. Push
the adjuster in the opposite direction to the arrow
to lock (Fig. 10).
(b) Setting the hole-drilling depth
Pull the adjuster on the handle in the direction of
the arrow to release the lock, move to the desired
position to determine the stroke, and push the
adjuster in the opposite direction to the arrow to
lock.
The nozzle travel distance when the tip of the
nozzle matches the tip of the drill bit is the hole-
drilling depth. (Fig. 11)
The maximum hole-drilling depth when using the
dust-collecting unit is 85 mm.
When using the dust-collecting unit, it is possible
to use HITACHI drill bits between 4 mm and 18 mm
in diameter and up to 100 mm in effective length.
English
mark. (Fig. 6)
12