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4. 

The rated speed of the accessory must be at 
least equal to the maximum speed marked on 
the power tool.

 Accessories running faster than 

their rated speed can break and fly apart. 

5. 

The outside diameter and the thickness of 
your accessory must be within the capacity 
rating of your power tool.

 Incorrectly sized 

accessories cannot be adequately guarded or 
controlled. 

6. 

The arbour size of wheels, flanges, backing 
pads or any other accessory must properly fit 
the spindle of the power tool.

 Accessories with 

arbour holes that do not match the mounting 
hardware of the power tool will run out of balance, 
vibrate excessively and may cause loss of control. 

7. 

Do not use a damaged accessory. Before each 
use inspect the accessory such as abrasive 
wheels for chips and cracks, backing pad for 
cracks, tear or excess wear, wire brush for 
loose or cracked wires. If power tool or 
accessory is dropped, inspect for damage or 
install an undamaged accessory. After 
inspecting and installing an accessory, 
position yourself and bystanders away from 
the plane of the rotating accessory and run the 
power tool at maximum no-load speed for one 
minute.

 Damaged accessories will normally break 

apart during this test time. 

8. 

Wear personal protective equipment. 
Depending on application, use face shield, 
safety goggles or safety glasses. As 
appropriate, wear dust mask, hearing 
protectors, gloves and workshop apron 
capable of stopping small abrasive or 
workpiece fragments.

 The eye protection must 

be capable of stopping flying debris generated by 
various operations . The dust mask or respirator 
must be capable of filtrating particles generated by 
your operation. Prolonged exposure to high 
intensity noise may cause hearing loss. 

9. 

Keep bystanders a safe distance away from 
work area. Anyone entering the work area 
must wear personal protective equipment.

 

Fragments of workpiece or of a broken accessory 
may fly away and cause injury beyond immediate 
area of operation. 

10. 

Hold power tool by insulated gripping 
surfaces only, when performing an operation 
where the cutting accessory may contact 
hidden wiring or its own cord.

 Cutting 

accessory contacting a "live" wire may make 
exposed metal parts of the power tool "live" and 
shock the operator. 

11. 

Position the cord clear of the spinning 
accessory.

 If you lose control, the cord may be cut 

or snagged and your hand or arm may be pulled 
into the spinning accessory.   

12. 

Never lay the power tool down until the 
accessory has come to a complete stop.

 The 

spinning accessory may grab the surface and pull 
the power tool out of your control. 

13. 

Do not run the power tool while carrying it at 
your side.

 Accidental contact with the spinning 

accessory could snag your clothing, pulling the 
accessory into your body.   

14. 

Regularly clean the power tool’s air vents.

 The 

motor’s fan will draw the dust inside the housing 
and excessive accumulation of powdered metal 
may cause electrical hazards. 

15. 

Do not operate the power tool near flammable 
materials.

 Sparks could ignite these materials. 

16. 

Do not use accessories that require liquid 
coolants.

 Using water or other liquid coolants may 

result in electrocution or shock. 

Kickback and Related Warnings

 

Kickback is a sudden reaction to a pinched or snagged 
rotating wheel, backing pad, brush or any other 
accessory. Pinching or snagging causes rapid stalling of 
the rotating accessory which in turn causes the 
uncontrolled power tool to be forced in the direction 
opposite of the accessory’s rotation at the point of the 
binding. 
For example, if an abrasive wheel is snagged or pinched 
by the workpiece, the edge of the wheel that is entering 
into the pinch point can dig into the surface of the 
material causing the wheel to climb out or kick out. The 
wheel may either jump toward or away from the operator, 
depending on direction of the wheel’s movement at the 
point of pinching. Abrasive wheels may also break under 
these conditions. 
Kickback is the result of power tool misuse and/or 
incorrect operating procedures or conditions and can be 
avoided by taking proper precautions as given below. 

a) 

Maintain a firm grip on the power tool and 

position your body and arm to allow you to 
resist kickback forces. Always use auxiliary 
handle, if provided, for maximum control over 
kickback or torque reaction during start-up.

 The 

operator can control torque reactions or kickback 
forces, if proper precautions are taken. 
b) 

Never place your hand near the rotating 

accessory.

 Accessory may kickback over your 

hand. 
c) 

Do not position your body in the area where 

power tool will move if kickback occurs.

 

Kickback will propel the tool in direction opposite to 
the wheel’s movement at the point of snagging. 
d) 

Use special care when working corners, 

sharp edges etc. Avoid bouncing and snagging 
the accessory.

 Corners, sharp edges or bouncing 

Summary of Contents for MGA400

Page 1: ...1 ENGLISH Original instructions INSTRUCTION MANUAL DOUBLE INSULATION IMPORTANT Read Before Using Angle Grinder MGA400 MGA450 MGA500 003565 ...

Page 2: ...o be used from sockets without earth wire GEA005 3 General Power Tool Safety Warnings WARNING Read all safety warnings and all instructions Failure to follow the warnings and instructions may result in electric shock fire and or serious injury Save all warnings and instructions for future reference The term power tool in the warnings refers to your mains operated corded power tool or battery opera...

Page 3: ... dangerous and must be repaired 20 Disconnect the plug from the power source and or the battery pack from the power tool before making any adjustments changing accessories or storing power tools Such preventive safety measures reduce the risk of starting the power tool accidentally 21 Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or the...

Page 4: ...trol the cord may be cut or snagged and your hand or arm may be pulled into the spinning accessory 12 Never lay the power tool down until the accessory has come to a complete stop The spinning accessory may grab the surface and pull the power tool out of your control 13 Do not run the power tool while carrying it at your side Accidental contact with the spinning accessory could snag your clothing ...

Page 5: ...the cut while the wheel is in motion otherwise kickback may occur Investigate and take corrective action to eliminate the cause of wheel binding d Do not restart the cutting operation in the workpiece Let the wheel reach full speed and carefully reenter the cut The wheel may bind walk up or kickback if the power tool is restarted in the workpiece e Support panels or any oversized workpiece to mini...

Page 6: ...metallic objects and avoid damaging internal parts 36 When use cut off wheel always work with the dust collecting wheel guard required by domestic regulation 37 Cutting discs must not be subjected to any lateral pressure SAVE THESE INSTRUCTIONS WARNING DO NOT let comfort or familiarity with product gained from repeated use replace strict adherence to safety rules for the subject product MISUSE or ...

Page 7: ... and unplugged before installing or removing the wheel Mount the inner flange onto the spindle THE SIDE WITH THE RUBBER SURFACE SHOULD CONTACT THE WHEEL for rubber molded inner flange only Fit the wheel on over the inner flange and screw the lock nut onto the spindle To tighten the lock nut press the shaft lock firmly so that the spindle cannot revolve then use the lock nut wrench and securely tig...

Page 8: ...nner flange varies by wheel thickness Refer to the table below Abrasive cut off wheel Diamond wheel Thickness Less than 4 mm 5 32 Thickness 4 mm 5 32 or more 16 mm 5 8 20 mm 13 16 22 23 mm 7 8 Abrasive cut off wheel Diamond wheel Thickness Less than 4 mm 5 32 Thickness 4 mm 5 32 or more Thickness Less than 4 mm 5 32 Thickness 4 mm 5 32 or more Thickness Less than 4 mm 5 32 Thickness 4 mm 5 32 or m...

Page 9: ...esult Replacement of carbon brushes 1 001145 Remove and check the carbon brushes regularly Replace when they wear down to the limit mark Keep the carbon brushes clean and free to slip in the holders Both carbon brushes should be replaced at the same time Use only identical carbon brushes Use a screwdriver to remove the brush holder caps Take out the worn carbon brushes insert the new ones and secu...

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Page 12: ...12 Makita Corporation www makita com 884731B7 ...

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