Alpha Tool.Com.HK Limited Grinder HSG125 User Manual

11
action may decrease the rotation speed which reduces the effi ciency of the grinder.
3.  Hold the tool with both hands while starting; the torque from the motor will cause the 
tool to jerk.
4.  When the grinding wheel fi rst comes into contact with the work surface or when the 
wheel is new, make contact slowly.
5.  Keep moving the tool in a circular motion to prevent grooving in the work surface.
6.  Hold the unit tightly to prevent it from walking, and remove the high spots in the work 
surface from...

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Switching off:  
To unlock, depress the back of the sliding switch.  
The switch will automatically move back as shown 
in Figure 4.
  BEFORE USE
  DANGER!
Before using the machine, check the following items.  In particular, check items 1 to 5 before 
plugging the power supply cord into the power outlet.
1.  Check the working voltage.
–  Be sure the voltage specifi ed on the rating plate is the voltage available at the 
power outlet.  If the machine is used with higher voltage than specifi ed, the motor...

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  WARNING!
1.  Before turning the switch ON, make sure the rotating parts are not touching   
anything. If the switch is turned ON while they are in contact with anything    
else, the wheel may get damaged and may cause injuries.
2.  When a new wheel is attached and the switch is turned ON, keep your body    
well away from the exposed sides of the wheel for a moment until the machine    
reaches its full speed.
It is very dangerous to perform grinding operations using cracked, chipped or damaged...

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USING THE TOOL 
  PROTECTIVE COVER INSTALLATION
  CAUTION!
The protective cover should be used to prevent the dust and fl ying debris from hitting the 
operator or from going inside the tool.  Failure to do so can shorten the life of the tool and 
void the limited warranty.
1.  Slide the protective cover onto clamping collar so that 
the lip on the protective cover fi ts into the groove on 
the tool.
2.  Position the protective cover with the shield facing 
backwards as shown in Figure 6.  Push down...

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 ASSEMBLING SPINDLE ATTACHMENTS
  CAUTION!
Do not leave threaded accessories on the spindle of the tool for extended periods of time, 
as this may result in making it diffi cult to remove these accessories.
Note:  The Alpha
® High-Speed Angle Grinder has a 5/8”-11 spindle thread .  It comes with 
two Inside Flange and Locking Flange sets: 20mm Arbor for 4” discs and 7/8” Arbor 
for 4-1/2” to 5” discs.  
To attach an approved spindle attachment to the tool, follow the steps below:
  CAUTION!
Always...

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While depressing the spindle button, 
rotate the spindle until the spindle lock 
button is inserted into the gear, thus 
locking the spindle in a fi xed position.
With the spindle locked in place, turn the 
locking fl ange clockwise until hand-tight.
Use the 34mm pin spanner wrench to secure tightly.
 
 DISASSEMBLING SPINDLE ATTACHMENTS
Please follow the reverse procedure for disassembling the working tool from the grinder. 3.
4.
5.
Figure-13
Figure-12
Figure-14 

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CHECKING AND REPLACING THE CARBON BRUSHES
In order to keep the tool running correctly, you need to check the carbon brushes after 
every one hundred hours of use.  Carbon brushes wear out over time based on the 
grinder’s usage.  If a carbon brush is worn out, it may cause the motor to malfunction or 
fail to run.  The carbon brushes should be replaced before the twisted wire reaches the 
bottom of the slot.
 
  DANGER!
Be sure to unplug the power cord from the outlet before servicing the unit, to...

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 CARBON BRUSH HOLDER REMOVAL
Disconnect the power wire from carbon brush 
holder.
Note:  Each grinder has 2 carbon brushes located 
on opposite sides of each other.  
2.  Remove the carbon brush holder from the 
motor housing by pulling the holder out with 
a pair of needle nose pliers.
3.  With the carbon brush holder removed, you 
can check and clean the armature commu-
tator.  The commutator is the contact points 
that the carbon brushes ride on when the 
motor is running. (See page 20 for cleaning...

19
4.  Pictured on the left below, is a worn carbon brush in the holder (Note: the twisted 
wire is at the end of the slot and the carbon brush is almost fl ush with holder).  On 
the right below, is a new carbon brush in the holder.
NOTE: Carbon brushes sometime wear at different rates; however, both carbon brushes 
should be replaced at the same time.  
  
  WARNING!
Replacing the carbon brushes in this unit with non-Alpha® parts could damage the unit, and 
will void the warranty. 
 CARBON BRUSH...

20 2.  Remove the old carbon brush and disconnect the wire terminal. If the inside of the 
holder is fi lled with dust, clean it before installing the new carbon brush.  Upon instal-
lation of the new carbon brush, make sure the twisted wire is in the slot and behind 
wire terminals on the holder (as in Figure 22 right photo).
3.  With the carbon brush holder removed, you can check and clean the armature com-
mutator.  The commutator is the contact points that the carbon brushes ride on when 
the motor is...