Maintenance And Inspection - Hitachi Koki GP 2S2 Handling Instructions Manual

5. Using the side handle (Fig. 3)
Be sure to use the side handle to avoid the risk
of severe electrical shock.
Attach the side handle to the machine as follows.
(1) Loosen the side handle grip and insert the side
handle to the nose bracket part of the machine from
the flange part of the side handle sleeve.
(2) Set the side handle to a position that is suited to
the operation and then securely tighten the side
handle grip.
HOW TO USE
1. Switching operation
(1) When moving the switch lever to the right (ON
side), power is applied; when moving it to the left
(OFF side), power is switched off.
(2) When first turning on the switch after installing a
new wheel, hold the grider away from your body
to avoid any danger of a wheel shattering due to
an imperfection.
(3) Before starting, test the machine with the wheel
pointed in a safe direction.
Materials to be ground
Mild steel, hard steel,
forged steel
Cast iron
Brass, bronze, aluminium
Ceramic
Synthetic resin
Small-scaled wheels with shaft are prepared for grinding
small surfaces. Their dimensions and shapes are shown
in "OPTIONAL ACCESSORIES".
Since wheel shaft diameter is 3 mm, use the collet chuck
for 3 mm shaft sold separately by your HITACHI dealer
as an optional accessory.

MAINTENANCE AND INSPECTION

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. 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.
Grain Grading
WA 60-80
C 36
C 36
WA 60-80
C 36
2. 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, correct 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 spoil the finishing
surface or lower grinding efficiency. Occasionally
dress the wheel by applying the dresser.
WHEEL SELECTING METHOD
Types of wheels are varied according to the materials to
be ground. Select a wheel appropriate for the material to
be ground.
The following table is an outline of wheels and materials
to be ground.
Bonding degree
P
M-O
J-K
M
K-M
4. Inspecting the carbon brushes (Fig. 4)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brushes with new ones 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 ensue that they
slide freely within the brush holders.
5. Replacing carbon brushes (Fig. 5)
<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 on the carbon brush
from the terminal section of brush holder and then
remove the carbon brush form 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.
English
Structure Bonding agent
m V
m V
m V
m V
m V
8