Maintenance And Inspection - Hitachi G10ST Handling Instructions Manual

English
(2) Do not apply cooling water or grinding fl uid while utilizing
the diamond wheel.
(3) Hold the tool fi rmly to control the tendency of the tool to
be repelled by the material during cutting operation.
(4) Ensure that the cutting depth is kept within 2-5 mm to
prevent over-heating damage to the motor. Use with
moderate cutting speed, and do not apply excessive
pressure on the workpiece.
○ Mounting the Guide Base Assembly. (Fig. 4)
(1) Loosen the two small screws on the wheel guard.
(2) Insert the guide piece between the wheel guard and set
plate (A), and tighten one of the small screws. Ensure
that the guide will not move.
(3) Set the angle of the wheel guard to a suitable position
for operation, and securely tighten the remaining small
screw to fi x the wheel guard in position.
○ Mounting the Diamond Wheel. (Fig. 5)
NOTE
Mounting of the diamond wheel on the spindle is illustrated
in Fig. 5. Note that the wheel washer is reversed from
ordinary usage with depressed center wheel.
(1) Mount the wheel washer and diamond wheel onto the
spindle.
(2) Mount the concave side of the wheel nut onto the diamond
wheel, and screw the wheel nut onto the spindle.
(3) As shown in Fig. 5 push in the lock pin to prevent rotation
of the spindle. Then, secure the diamond wheel by
tightening the wheel nut with the wrench.

MAINTENANCE AND INSPECTION

1. Inspecting the depressed center wheel
Ensure that the depressed center wheel is free of cracks
and surface defects.
Replace the depressed center wheel when it has been
worn out to about 60mm in external diameter.
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 (Fig. 8)
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.
4. Inspecting the carbon brushes
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 fi gure 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. Replacing carbon brushes
Disassemble the brush caps with a slotted-head
screwdriver. The carbon brushes can then be easily
removed.
6. If the supply cord of this tool damaged, it must be
replaced by a specially prepared cord available through
the service organization.
7. Service parts list
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.
7
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
MODIFICATION
Hitachi Power Tools are constantly being improved
and modifi ed to incorporate the latest technological
advancements.
Accordingly, some parts 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.