Maintenance And Inspection - Hitachi SP 18VA Handling Instructions Manual

CAUTION
The dial cannot be rotated further than the "6" or "1" on the
scale in their respective directions.
1. Sander operation
(1) This unit is designed to provide suffi cient polishing
(sanding) power with the disc pressed lightly against
the sanding/polishing surface: it is equipped with an
electronic control circuit to ensure that the motor will not
slow down even when loaded. There is therefore no need
to press the sanding disc hard against the surface; doing
so can overload the motor, subsequently causing the
overload cut device to step into operation by cutting the
motor's power supply.
If this should happen, cut the power switch and turn at the
correct motor speed.
(2) Do not apply the entire disc surface to the surface of
the material. As shown in Fig. 2, the sander should be
held at an approximately 15° to 25° angle in relation to
the material surface so that the peripheral portion of the
sanding disc is off ered to the material surface.
(3) Precaution immediately after fi nishing an operation:
After turning the switch OFF, do not put the sander down
until the sanding disc has come to a complete stop. This
precaution will not only prevent a serious accident, but
will also reduce the amount of dust and swarf sucked into
the machine.
2. Polisher operation
(1) Curved surfaces as well as fl at surfaces can be effi ciently
fi nished. Do not excessively push the polisher against the
surface of the material. The weight of the polisher alone
is suffi cient for eff ective polishing. Excessive pressure
will result in a poor fi nish and cause possible overload to
the motor.
(2) Sanding disc, polishing compound or wax should be
selected in accordance with the material and the desired
surface fi nish. Maximum polishing eff ect will be attained
by following the following method:
○ Preliminary polishing with sander using a fi negrain
sanding disc.
○ Polishing with wool bonnet using polishing compound
and/or wax. Apply a small quantity of compound and/or
wax on material surface and polish with the wool bonnet.
CAUTION
○ Carefully guard against permitting the cabtyre cord to
touch the wool bonnet or sanding disc during operation.
If the cord touches, there is a danger that it may become
entangled.
○ Do not use the lock pin as a brake to stop the tool as
this may lead to damage of the gear or detachment of the
tool.
MOUNTING AND DISMOUNTING THE SANDING
DISC AND WOOL BONNET
1. For Sander operation (Fig. 3)
(1) After placing the sanding disc on the rubber pad, thread
the washer nut onto the spindle.
(2) Press the lock pin to secure the spindle and tighten the
washer nut with a wrench.
(3) To remove the sanding disc, follow the above procedures
in reverse.
2. For Polisher operation (Fig. 4)
(1) Insert the washer nut through the rubber pad and thread
it onto the spindle.
(2) Press the lock pin to secure the spindle and tighten the
washer nut with a wrench.
(3) As shown in Fig. 5, wrap the rubber pad with the hood
of the wool bonnet, and fi rmly secure it by tightening and
tying its draw string. Be sure the excess string is fi rmly
tucked inside the wool bonnet to prevent it from fl ying out
while polishing.
CAUTION
Improper fi tting of the wool bonnet may cause vibration.
(4) To remove the wool bonnet, follow the above procedures
in reverse.
CAUTION
○ Use a wrench to tighten the washer nut suffi ciently.
○ After releasing the lock pin, check to be sure that it
has returned to its normal position.

MAINTENANCE AND INSPECTION

1. 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.
2. Inspecting the carbon brushes (Fig. 6)
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.
3. Replacing a carbon brush
Disassemble the brush cap with a minus-head
screwdriver. The carbon brush can then be easily
removed.
4. 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.
5. Cleaning lock pin section
If the lock pin section becomes dirty, clean it at once.
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 a 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.
English
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