How To Use The Core Bit; Maintenance And Inspection - HIKOKI DH 28PD Instrucciones De Manejo

(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. 24)
11. Using the side handle
When you wish to change a position of the side handle,
turn grip of the side handle counterclockwise to loosen
it, and then fasten it fi rmly.
CAUTION
When boring a hole, there can be a case where the
machine attempts to rotate by the reaction at the time
of penetrating a concrete wall and/or when a tip of the
blade comes in contact with the rebar.
Firmly fasten the side handle and hold the machine
with both of your hands. Unless you hold it securely, an
accident can occur.

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. 25).
Lubricate the thread of the core bit shank to facilitate
disassembly.
(2) Mount the core bit to the rotary hammer (Fig. 26).
(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. 27).
2. How to bore (Fig. 28)
(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. 29)
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.
GREASE REPLACEMENT
This machine is full air-tight construction to protect against
dust incursion and to prevent lubricant leakage. This
machine can be used without grease replenishment for
an extended period of time. However, perform the grease
replacement to extend the service life. Replace the grease
as described below.
1. Grease Replacement Period
You should look at the grease when you change the
carbon brush. (See item 4 in the section MAINTENANCE
AND INSPECTION.)
Ask for grease replacement at the nearest authorized
HiKOKI Service Center.
In the case that you are forced to change the grease by
yourself, please follow the following points.
2. How to replace grease
CAUTION
Before replacing the grease, turn the power off and pull
out the plug from the receptacle.
(1) Disassemble the crank cover and thoroughly wipe off
the old grease inside. (Fig. 30)
(2) Supply 25 g of HiKOKI Electric Hammer Grease A
(standard accessory, contained in tube) in the crank
case.
(3) After replacing the grease, reassemble the crank cover
securely. At this time, do not damage or lose the oil
seal.
NOTE
The HiKOKI Electric Hammer Grease A is of the
low viscosity type. When the grease is consumed,
purchase from the
Center.

MAINTENANCE AND INSPECTION

1. Inspecting the drill bits
Since use of a dull tool will cause motor malfunctioning
and degraded effi ciency, replace the drill bit with new
ones or resharpen them without delay when abrasion is
noted.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that
they are properly tightened. Should any of the screws
be loose, retighten them immediately. Failure to do so
could result in serious hazard.
3. Maintenance of the motor
The motor unit winding is the very "heart" of the power
tool. Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
4. Inspecting the carbon brushes (Fig. 31)
The Motor employs carbon brushes which are
consumable parts. When they become worn to or
near the "wear limit", it could result in motor trouble. At
that time, replace both carbon brushes with new ones
which have the same carbon brush Numbers shown
in the fi gure. In addition, always keep carbon brushes
clean and ensure that they slide freely within the brush
holders.
5. Replacing carbon brushes
Loosen the set screw and remove the tail cover. Remove
the brush caps and carbon brushes. After replacing the
carbon brushes, do not forget to tighten the brush caps
securely and to install the tail cover.
6. Service parts list
A: Item No.
B: Code No.
C: No. Used
D: Remarks
CAUTION
Repair, modifi cation and inspection of HiKOKI Power
Tools must be carried out by a HiKOKI Authorized
Service Center.
This Parts List will be helpful if presented with the tool to
the HiKOKI Authorized Service Center when requesting
repair or other maintenance.
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
English
authorized HiKOKI Service
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