Hitachi W 4YF Handling Instructions Manual page 26

English
(1) Turn the stopper and move it to the slider side.
(2) When you face the main body tip down as in Fig.
12 and pull the bit holder in the
two fingers, the bit comes out.
CAUTION:
Since the bit drops, when working in high places,
support the slider tip with your hand and remove
with great care.
(3) If the bit does not come out when you press the
bit holder, grab hold of the bit with pliers or the
like and pull it out.
2. Installation
(1) Press the slider down as in Fig. 13 and insert the
bit into the socket hole. Turning the bit slightly
makes it go in easier.
(2) When you face the main body top up as in Fig.
14 and pull the bit holder in the
two fingers, the bit enters the socket.
Check that the bit does not come out when you
pull on it.
Bit
Slider
SCREW HANDLING
NOTE:
Handle both the packed box of screws and the collated
screw strips with care. If you drop them, screws can
come out of the collated tape and cause screw feed
malfunctions. Do not subject the screws to prolonged
periods of direct sunlight of outside air. They can cause
rust and collated tape problems, so when you will not
be using the screws for a while, put them in the screw
packing box or the like.
25
direction with
direction with
Socket
Bit holder
Fig. 13
Fig. 14
MAINTENANCE AND INSPECTION
1. Inspecting the bit
Since continued use of a worn bit will damage
screw heads, replace the bit with a new one as soon
as excessive wear is noticed.
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.
CAUTION:
Dirt or dust within the motor can cause breakdowns,
so after about 50 hours of use, run the motor with
no load and blow compressed dry air in from the
housing switch side ventilation hole to blow dirt
and dust out of the motor.
4. Inspecting the carbon brushes (Fig. 15)
The motor employs carbon brushes which are
consumable parts.
Since an excessively worn carbon brush can result
in motor trouble, replace the carbon brush with a
new one having the same carbon brush No. shown
in the figure, when it becomes worn to or near the
"wear limit". In addition, always keep carbon brushes
clean and ensure that they slide freely within the
brush holders.
5 mm
12 mm
5. Replacing a carbon brush:
Disassemble the brush cap with a screwdriver. The
carbon brush can the be easily removed.
NOTE
Due to HITACHI's continuing program of research and
development, the specifications herein are subject to
change without prior notice.
Information concerning airborne noise and vibration
The measured values were determined according to
EN50144.
The typical A-weighted sound pressure level: 80 dB (A).
Wear ear protection.
The typical weighted root mean square acceleration
value does not exceed 2.5m/s
Wear limit
21
No. of carbon brush
Fig. 15
2 .