How To Use The Core Bit - Hitachi DH 24PB3 Handling Instructions Manual

(1) Attach 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.
CAUTION
○ 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 rotary hammer in
addition.
○ Drill bits may snap off while withdrawing the rotary
hammer from the drilled hole. For withdrawing, it is
important to use a pushing motion.
○ 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 rotary hammer 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. 12)
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.
CAUTION
○ Exercise care not to excessively prolong driving time,
otherwise, the screws may be damaged by excessive
force.
○ 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.
○ 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. 12)
(1) Selecting a suitable driver bit
Employ plus-head screws, if possible, since the driver bit
easily slips off the heads of minus-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 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. Hammering only (DH24PC3 only)
This rotary hammer can be set to hammering only mode
by pressing the push button and turning the change lever
to the mark (Fig. 13).
(1) Mount the bull point or cold chisel.
(2) Press the push button and set the change lever to middle
of mark and mark (Fig. 14).
The rotation is released, turn the grip and adjust the cold
chisel to desired position (Fig. 15).
(3) Turn the change lever to
Then bull point or cold chisel is locked.
7. Using depth gauge (Fig. 16)
(1) Loosen the knob on the side handle, and insert the depth
gauge into the mounting hole on the side handle.
mark (Fig. 13).
(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 rotary hammer
(Fig. 17).
(2) Mount the drill bit (taper shank) to the taper shank adapter
(Fig. 17).
(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 hammer supporting on a rests (Fig. 18).

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. 19).
Lubricate the thread of the core bit shank to facilitate
disassembly.
(2) Mount the core bit to the rotary hammer (Fig. 20).
(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 faces downward (Fig. 21).
2. How to bore (Fig. 22)
(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 fl oor straight.
Connect the core bit tip fl ush 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 rotary hammer.
CAUTION
When removing the center pin and the guide plate,
turn OFF the switch and disconnect the plug from the
receptacle.
3. Dismounting (Fig. 23)
Remove the core bit shank from the rotary hammer and
strike the head of the core bit shank strongly two or three
times with a hammer holding the core bit, then the thread
becomes loose and the core bit can be removed.
LUBRICATION
Low viscosity grease is applied to this rotary hammer so
that it can be used for a long period without replacing the
grease. Please contact the nearest service center for grease
replacement when any grease is leaking form loosened
screw.
Further use of the rotary hammer with lock off grease will
cause the machine to seize up reduce the service life.
CAUTION
A special grease is used with this machine, therefore,
the normal performance of the machine may be badly
aff ected by use of other grease. Please be sure to let
one of our service agents undertake replacement of the
grease.
English
10