Hitachi DH 25PA Handling Instructions Manual page 18

3. Rotation only (DH25PB)
The hammer drill 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:
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 hammer drill as well.
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 hammer drill 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) or (H).
Next, mount chuck adapter (D) or (H) 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:
Exercise care not to excessively prolong driving
time, otherwise, the screws may be damaged by
excessive force.
Apply the hammer drill 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 hammer drill 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
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.
After rotating the hammer drill 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.
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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 hammer drill.
(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 hammer drill (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).
2. How to bore (Fig. 16)
(1) Connect the plug to the power source.
(2) A spring is installed in the center pin.
Push it lightly to the wall or the floor perpendicularly.
Connect the core bit tip flush to the surface and
start operating.
(3) When boring about 5 mm in depth the position of
the hole will be established. Bore after that removing
the center pin and the guide plate from core bit.
(4) Application of excessive force will not only decelerate
the working efficiency, but it will deteriorate the tip
edge of the drill bit, resulting in reduced service
life of the hammer drill.
CAUTION
When removing the center pin and the guide plate,
turn OFF the switch and disconnect the plug from
the receptacle.
3. Dismounting (Fig. 17)
Remove the core bit shank from the hammer drill
and strike the head of the core bit shank strongly
two or three times with a manual hammer holding
the core bit, then the thread becomes loose and
the core bit can be removed.