Maintenance And Inspection - Hitachi Koki GP 3V Manual De Instrucciones

English
CAUTION
When using the grinder in the immediate vicinity
of welding equipment, the rotational speed may
become unstable. Do not use the grinder near
welding equipment.
When using the tool at any value except the full
speed (Dial scale 6), the motor cannot be
sufficiently cooled due to the decreased number
of revolution. This could result in the risk of
burning and damaging the motor before an
overload protective mechanism starts to function.
Make sure that you use the tool by lightly applying
it to the surface of material when you use it at
any value except the full speed (Dial scale 6).
WARNING:
Do not press the grinder forcibly against the
surface to be ground. Heavy pressure can result
in wheel breakage and serious injury. It can also
damage the surface being ground or damage the
grinder's motor.

MAINTENANCE AND INSPECTION

WARNING:
Be sure to switch power OFF and disconnect the
plug during maintenance and inspection.
Using cracked, deformed or damaged wheels can
lead to wheel breakage and resulting serious
injury.
1. Inspecting the wheel
Ensure that the 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 loose, retighten them immediately.
WARNING:
Using this hand grinder with loosened screws is
extremely dangerous.
3. Inspecting the carbon brushes (Fig. 7)
The motor employs carbon brushes which are
consumable parts. Replace the carbon brush with
a new one when it becomes worn to its wear limit.
Always keep carbon brushes clean and ensure that
they slide freely within the brush holders.
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3. Precautions on operation
(1) Lightly press the wheel to the material to be ground
when grinding materials, high-speed revolution is
necessary. Use a hand grinder with high-speed
revolution, minimizing the pressing force.
(2) Dressing the wheel
After attaching a wheel, adjust deflection of the
wheel center by using a dresser.
If the wheel center is eccentric, not only precise
finishing cannot be achieved but also grinder
vibration increases, lowering grinder accuracy and
durability.
A clogged or worn wheel will soil the finishing
surface or lower grinding efficiency. Occasionally
dress the wheel by applying the dresser.
Wear limit
0.67" (17 mm)
CAUTION
Using this hand grinder with a carbon brush which
is worn in excess of the wear limit will damage
the motor.
NOTE:
Use HITACHI carbon brush No. 88 indicated in
Fig. 7.
4. Replacing carbon brushes (Fig. 8):
<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.
No. of carbon brush
88
0.24" (6 mm)
Fig. 7