Maintenance And Inspection - Hitachi SP 18V Instrucciones De Manejo

1. Sander operation
(1) This unit is designed to provide sufficient 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 pe-
ripheral portion of the sanding disc is offered to the
material surface.
(3) Precaution immediately after finishing 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 flat surfaces can be
efficiently finished. Do not excessively push the
polisher against the surface of the material. The
weight of the polisher alone is sufficient for effective
polishing. Excessive pressure will result in a poor
finish 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 finish. Maximum polishing effect
will be attained by following the following method:
Preliminary polishing with sander using a finegrain
sanding disc.
Polishing with wool bonnet using polishing com-
pound and/or wax. Apply a small quantity of com-
pound 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.
MOUNTING AND DISMOUNTING THE SAND-
ING 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 firmly secure it by
tightening and tying its draw string. Be sure the
excess string is firmly tucked inside the wool bonnet
to prevent it from flying out while polishing.
CAUTION
Improper fitting of the wool bonnet may cause vi-
bration.
(4) To remove the wool bonnet, follow the above
procedures in reverse.
CAUTIONS
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. Fail-
ure to do so could result in serious hazard.
2. Inspecting the carbon brushes (Fig. 6)
The motor employs carbon brushes which are con-
sumable 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 figure 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 screw-
driver. The carbon brush can then be easily re-
moved.
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.
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