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Hitachi DH 25 PB Manual

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English
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.
2. Rotation + striking (DH25PA and DH25PB)
This rotary hammer can be set to rotation and
striking mode by rotating the change lever (DH25PB
only) fully counter-clockwise to
mark. (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 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 a rebar, 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. 6.
3. Rotation only (DH25PB)
The rotary hammer can be set to rotation only
mode by rotating the change lever fully clockwise
to
mark. (Fig. 7)
To drill wood or metal material using the drill chuck
and chuck adapter (optional accessory), carry out
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.
CAUTIONS:
⅜ Application of force more than necessary will not
only decelerate the working efficiency, but it will
deteriorate the tip edge of the drill bit and reduce
the service life of the rotary hammer as well.
⅜ Do not attempt to drill anchor holes or holes in
concrete with the machine set in the rotation only
function.
⅜ 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 each component of the
power tool.
4. When driving machine screws (Fig. 9)
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.
CAUTIONS:
⅜ Exercise care not to excessively prolong driving
time, otherwise, the screws may be damaged by
excessive force.
⅜ 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.
⅜ Do not attempt to use the rotary hammer in the
rotation and striking function with the chuck adapter
and bit attached.
5. When driving wood screws (Fig. 9)
(1) Selecting a suitable driver bit
Recommended to employ cross-recessed screws,
since the driver bit easily slips off the heads of
slotted-head screws.
(2) Driving in wood screws
⅜ Prior to driving in wood screws, make pilot holes
suitable for them in the wooden board. Apply the
bit to the screw head recesses and gently drive the
screws into the holes.
⅜ 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.
6. Using the stopper (Fig.10)
(1) Loosen the knob on the side handle, and insert the
stopper into the mounting hole on the side handle.
(2) Adjust the stopper position according to the depth
of the hole and tighten 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. 11)
(2) Mount the drill bit (taper shank) to the taper shank
adapter. (Fig. 11)
(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 manual hammer
supporting on the rests. (Fig. 12)
HOW TO USE THE CORE BIT
(FOR LIGHT LOAD)
When boring penerating large holes use the core bit (for
light loads). At that time use with the center pin and the
core bit shank provided as optional accessories.
1. Mounting
CAUTION
Be sure to turn power OFF and disconnect the plug
from the receptacle.
(1) Mount the core bit to the core bit shank. (Fig. 13).
Lubricate the thread of the core bit shank to facilitate
disassembly.
(2) Mount the core bit to the rotary hammer (Fig. 14).
(3) Insert the center pin into the guide plate until it
stops.
(4) Engage the guide plate with the core bit, and turn
the guide plate to the left or the right so that it
does not fall even if it faced downward. (Fig. 15).
01Eng_DH25PA_WE 08/10/6, 16:3111
… 12 …


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