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have a tendency to snag the rotating accessory and 
cause loss of control or kickback. 
e) 

Do not attach a saw chain woodcarving blade 

or toothed saw blade.

 Such blades create 

frequent kickback and loss of control 

Safety Warnings Specific for Grinding and Abrasive 
Cutting-Off Operations: 

a) 

Use only wheel types that are recommended 

for your power tool and the specific guard 
designed for the selected wheel.

 Wheels for 

which the power tool was not designed cannot be 
adequately guarded and are unsafe. 
b) 

The guard must be securely attached to the 

power tool and positioned for maximum safety, 
so the least amount of wheel is exposed 
towards the operator.

 The guard helps to protect 

operator from broken wheel fragments and 
accidental contact with wheel. 
c) 

Wheels must be used only for recommended 

applications. For example: do not grind with 
the side of cut-off wheel.

 Abrasive cut-off wheels 

are intended for peripheral grinding, side forces 
applied to these wheels may cause them to shatter. 
d) 

Always use undamaged wheel flanges that 

are of correct size and shape for your selected 
wheel.

 Proper wheel flanges support the wheel 

thus reducing the possibility of wheel breakage. 
Flanges for cut-off wheels may be different from 
grinding wheel flanges. 
e) 

Do not use worn down wheels from larger 

power tools.

 Wheel intended for larger power tool 

is not suitable for the higher speed of a smaller tool 
and may burst. 

Additional Safety Warnings Specific for Abrasive 
Cutting-Off Operations: 

a) 

Do not “jam” the cut-off wheel or apply 

excessive pressure. Do not attempt to make an 
excessive depth of cut.

 Overstressing the wheel 

increases the loading and susceptibility to twisting 
or binding of the wheel in the cut and the possibility 
of kickback or wheel breakage. 
b) 

Do not position your body in line with and 

behind the rotating wheel.

 When the wheel, at the 

point of operation, is moving away from your body, 
the possible kickback may propel the spinning 
wheel and the power tool directly at you. 
c) 

When wheel is binding or when interrupting a 

cut for any reason, switch off the power tool 
and hold the power tool motionless until the 
wheel comes to a complete stop. Never attempt 
to remove the cut-off wheel from 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 minimize the risk of wheel pinching and 
kickback.

 Large workpieces tend to sag under 

their own weight. Supports must be placed under 
the workpiece near the line of cut and near the 
edge of the workpiece on both sides of the wheel. 
f) 

Use extra caution when making a “pocket 

cut” into existing walls or other blind areas.

 The 

protruding wheel may cut gas or water pipes, 
electrical wiring or objects that can cause kickback. 

Safety Warnings Specific for Sanding Operations: 

a) 

Do not use excessively oversized sanding 

disc paper. Follow manufacturers 
recommendations, when selecting sanding 
paper.

 Larger sanding paper extending beyond the 

sanding pad presents a laceration hazard and may 
cause snagging, tearing of the disc or kickback. 

Safety Warnings Specific for Wire Brushing 
Operations: 

a) 

Be aware that wire bristles are thrown by the 

brush even during ordinary operation. Do not 
overstress the wires by applying excessive 
load to the brush.

 The wire bristles can easily 

penetrate light clothing and/or skin. 
b) 

If the use of a guard is recommended for wire 

brushing, do not allow interference of the wire 
wheel or brush with the guard.

 Wire wheel or 

brush may expand in diameter due to work load 
and centrifugal forces. 

Additional safety warnings: 

17. 

When using depressed centre grinding wheels, 

be sure to use only fiberglass-reinforced 
wheels. 

18. 

Be careful not to damage the spindle, the 
flange (especially the installing surface) or the 
lock nut. Damage to these parts could result in 
wheel breakage. 

19. 

Make sure the wheel is not contacting the 
workpiece before the switch is turned on. 

20. 

Before using the tool on an actual workpiece, 
let it run for a while. Watch for vibration or 
wobbling that could indicate poor installation 
or a poorly balanced wheel. 

21. 

Use the specified surface of the wheel to 
perform the grinding. 

22. 

Watch out for flying sparks. Hold the tool so 
that sparks fly away from you and other 
persons or flammable materials. 

23. 

Do not leave the tool running. Operate the tool 
only when hand-held. 

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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