Hitachi G18SS [9/76] English
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Hitachi G18SS [9/76] English

Hitachi G18SS [9/76] English
8
English
2. Grinding angle
Do not apply the entire surface of the depressed
center wheel to the material to be ground. As
shown in Fig. 2, the machine should be held at an
angle of 15° – 30° so that the external edge of the
depressed center wheel contacts the material at an
optimum angle.
3. To prevent a new depressed center wheel from
digging into the workpiece, initial grinding should
be performed by drawing the grinder across the
workpiece toward the operator (Fig. 2 direction B).
Once the leading edge of the depressed center
wheel is properly abraded, grinding may be
conducted in either direction.
4. Switch operation
Switch ON: Push the locking button forward and
then press the switch lever.
* For continuous use, press the switch
lever. The switch lever is locked by
pushing the locking button forward
once again.
(*Subject to change depending on
area.)
Switch OFF: Press and release the switch lever.
5. Precautions immediately after finishing operation
After switching off the machine, do not put it down
until the depressed center wheel has come to a
complete stop. Apart from avoiding serious
accidents, this precaution will reduce the amount
of dust and swarf sucked into the machine.
CAUTION:
䡬 Check that the work piece is properly supported.
䡬 Ensure that ventilation openings are kept clear when
working in dusty conditions.
If it should become necessary to clear dust, first
disconnect the tool from the mains supply (use non-
metallic objects) and avoid damaging internal parts.
䡬 Ensure that sparks resulting from use do not create
a hazard e.g. do not hit persons, or ignite flammable
substances.
䡬 Always use eye and ear protection.
Other personal protective equipment such as dust
mask, gloves, helmet and apron should be worn
when necessary.
If in doubt, wear the protective equipment.
䡬 When the machine is not use, the power source
should be disconnected.
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:
䡬 Comfirm that the depressed center wheel is mounted
firmly.
䡬 Confirm 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. 3)
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 figure. In addition, always keep carbon
brushes clean and ensure that they slide freely
within the brush holders.
4. Replacing carbon brushes
Disassemble the brush cap with a slotted-head
screwdriver. The carbon brush can then be easily
removed.
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
CAUTION:
Repair, modification 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 modified 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 specifications herein are subject to
change without prior notice.
01Eng_G18SS_EE 08/11/17, 10:258

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English 2 Grinding angle Do not apply the entire surface of the depressed center wheel to the material to be ground As shown in Fig 2 the machine should be held at an angle of 15 30 so that the external edge of the depressed center wheel contacts the material at an optimum angle 3 To prevent a new depressed center wheel from digging into the workpiece initial grinding should be performed by drawing the grinder across the workpiece toward the operator Fig 2 direction B Once the leading edge of the depressed center wheel is properly abraded grinding may be conducted in either direction 4 Switch operation Switch ON Push the locking button forward and then press the switch lever For continuous use press the switch lever The switch lever is locked by pushing the locking button forward once again Subject to change depending on area Switch OFF Press and release the switch lever 5 Precautions immediately after finishing operation After switching off the machine do not put it down until the depressed center wheel has come to a complete stop Apart from avoiding serious accidents this precaution will reduce the amount of dust and swarf sucked into the machine CAUTION O Check that the work piece is properly supported O Ensure that ventilation openings are kept clear when working in dusty conditions If it should become necessary to clear dust first disconnect the tool from the mains supply use nonmetallic objects and avoid damaging internal parts O Ensure that sparks resulting from use do not create a hazard e g do not hit persons or ignite flammable substances O Always use eye and ear protection Other personal protective equipment such as dust mask gloves helmet and apron should be worn when necessary If in doubt wear the protective equipment O When the machine is not use the power source should be disconnected 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 O Comfirm that the depressed center wheel is mounted firmly O Confirm 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 3 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 figure In addition always keep carbon brushes clean and ensure that they slide freely within the brush holders 4 Replacing carbon brushes Disassemble the brush cap with a slotted head screwdriver The carbon brush can then be easily removed 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 CAUTION Repair modification 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 modified to incorporate the latest technological advancements Accordingly some parts may be changed without prior notice NOTE Due to HITACHI S continuing program development the specifications herein change without prior notice of research and are subject to 8

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