Hitachi DH24PC Handling Instructions Manual page 21

CAUTIONS:
Application of force more than necessary will not
only expedite the work, but will deteriorate the tip
edge of the drill bit and reduce the service life of the
hammer drill in addition.
Drill bits may snap off while disengaging the hammer
drill from the jammed hole. For disengaging, it is
important to use a pushing motion or turn the drill bit
counterclockwise.
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 every component of the machine.
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:
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
Employ cross-recessed screws, if possible, 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 grooves 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.
6. Striking only
This hammer drill can be set to striking only mode by
pressing the push button and turning the change
lever to mark. (Fig. 10)
(1) Mount the bull point or cold chisel.
(2) Press the push button and set the change lever to
middle of mark and
The rotation is released, turn the grip and adjust the
cold chisel to desired position. (Fig. 12)
mark. (Fig. 11)
(3) Turn the change lever to
Then bull point or cold chisel is locked.
7. Using depth gauge (Fig. 13)
(1) Loosen the knob on the side handle, and insert the
depth gauge into the mounting hole on the side
handle.
(2) Adjust the depth gauge position according to the
depth of the hole and thighten the knob securely.
8. How to use the drill bit (taper shank) and the taper
shank adapter
(1) Mount the taper shank adapter to the hammer drill.
(Fig. 14)
(2) Mount the drill bit (taper shank) to the taper shank
adapter. (Fig. 14)
(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 a rests. (Fig. 15)
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. 16).
Lubricate the thread of the core bit shank to facilitate
disassembly.
(2) Mount the core bit to the hammer drill (Fig. 17).
(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. 18).
2. How to bore (Fig. 19)
(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 expedite
the work, but 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. 20)
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.
mark. (Fig. 10)
20