Assembling And Disassembling The Depressed Center Wheel; Maintenance And Inspection - Hitachi G 18SE3 Handling Instructions Manual

ASSEMBLING AND DISASSEMBLING THE
DEPRESSED CENTER WHEEL
CAUTION Be sure to switch OFF and disconnect the
attachment plug from the receptacle to avoid a
serious accident.
1. Assembling (Fig. 1)
(1) Turn the machine upside down so that the spindle is
facing upward.
(2) Mount the wheel washer onto the spindle.
(3) Fit the protruding part of the depressed center wheel or
diamond wheel onto the wheel washer.
(4) Screw 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 the accessory wrench, as
shown in Fig.1.
2. Disassembling
Follow the above procedures in reverse.
CAUTION
○ Confi rm that the depressed center wheel is mounted
fi rmly.
○ Confi rm that the push button is disengaged by pushing
push button two or three times before switching the
power tool 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 loose, retighten them immediately. Failure to do so
could result in serious hazard.
3. Inspecting the carbon brushes (Fig. 4)
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-stop 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 fi gure. In addition, always keep carbon brushes clean
and ensure that they slide freely within the brush holders.
4. Replacing carbon brushes (Fig. 5)
<Disassembly>
(1) Loosen the D4 tapping screw retaining the brush cover
and remove the brush 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 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.
6. Service parts list
A: Item No.
B: Code No.
C: No. Used
D: Remarks
CAUTION
Repair, modifi cation and inspection of Hitachi Power
Tools must be carried out by an Hitachi Authorized
Service Center.
This Parts List will be helpful if presented with the tool to
the Hitachi 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.
MODIFICATIONS
Hitachi Power Tools are constantly being improved
and modifi ed to incorporate the latest technological
advancements.
Accordingly, some parts (i.e. code numbers and/or
design) may be changed without prior notice.
NOTE
Due to HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
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