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17
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by drawing the grinder across the workpiece toward
the operator (Fig. 3 direction B). Once the leading
edge of the depresssed center wheel is properly
abraded, grinding may be conducted in either
direction.
4. Switch operation
[When the switch has locking mechanism]
Switch ON: To switch on, slide the lock lever in the
direction of A and press the paddle
lever in the direction of B as shown
in Fig. 4-a. Furthermore, slide the lock
lever in the direction of C shown in
Fig. 4-b while pressing the paddle lever
to lock and enable continuous
operation.
Switch OFF: To release the locking mode, press the
paddle lever in the direction of B
shown in Fig. 4-a, and release the
paddle lever to switch off.
[When the switch has no locking mechanism]
To switch on, slide the lock lever in the direction
of A and press the paddle lever in the direction
of B as shown in Fig. 4-a. Release the paddle
lever to switch off.
NOTE: The paddle lever can not be locked.
5. Precautions immediately after finishing operation
After switching off the grinder, do not put it down
until the depressed center wheel has come to a
complete stop. Apart from avoiding serious accidents,
this precaution will reduce the amount of dust and
swarf sucked into the grinder.
CAUTION
When the grinder is not in use, the power source
should be disconnected.
ASSEMBLING AND DISASSEMBLING THE
DEPRESSED CENTER WHEEL (Fig. 1)
CAUTION:
Be sure to switch power OFF and disconnect the
attachment plug from the power receptacle to avoid
serious trouble.
1. Assembling (Fig. 1)
(1) Turn the grinder upsidedown so that the spindle is
facing upward.
(2) Mount the wheel washer onto the spindle.
(3) Fit the protuberance of the depressed center wheel
or diamond wheel onto the wheel washer.
(4) Assemble the wheel nut onto the spindle.
(For diamond wheel assembling, use the wheel nut
with the convex side against the diamond wheel.)
(5) Insert the push button to prevent rotation of the
spindle, and tighten the wheel nut with accessory
wrench, as shown in Fig. 1.
2. Disassembling
Follow the above procedures in reverse.
CAUTIONS:
⅜ Confirm that the grinder wheel is mounted firmly.
⅜ Confirm that the spindle lock mechanism is
disengaged by pushing push button two or three
times before switching the grinder on.
MAINTENANCE AND INSPECTION
1. Inspecting the depressed center wheel
Ensure that the depressed center wheel is free of
cracks and surface defects.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure
that they are properly tightened. Should any of the
screws be loosened, retighten them immediately.
Failure to do so could result in serious hazard.
3. Inspecting the carbon brushes (Fig. 5)
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. When an
auto-shop carbon brush is equipped, the motor will
stop automatically.
At that time, replace both carbon brushes with new
ones which have the same carbon brush Numbers
shown in the figure. In addition, always keep carbon
brushes clean and ensure that they slide freely
within the brush holders.
4. Replacing a carbon brush (Fig. 6)
<Disassembly>
(1) Loosen the D4 tapping screw retaining the tail cover
and remove the tail cover.
(2) Use the auxiliary hexagonal wrench or small
screwdriver to pull up the edge of the spring that
is holding down the carbon brush.
Remove the edge of the spring toward the outside
of the brush holder.
(3) Remove the end of the pig-tail of the carbon brush
from the terminal section of brush holder and then
remove the carbon brush from the brush holder.
<Assembly>
(1) Insert the end of the pig-tail of the carbon brush
in the terminal section of brush holder.
(2) Insert the carbon brush in the brush holder.
(3) Use the auxiliary hexagonal wrench or small
screwdriver to return the edge of the spring to the
head of the carbon brush.
(4) Mount the tail cover and tighten the D4 tapping
screw.
5. 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.
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: 85 dB (A).
Wear ear protection.
The typical weighted root mean square acceleration
value does not exceed 2.5m/s
2
.