1200W
125MM (5”)
ANGLE GRINDER
AG125MAG
INSTRUCTION MANUAL
050922 ED4 JJ
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Dear Customer
Description of symbols
The rating plate on your tool may show symbols. These
represent important information about the product or instructions
on its use.
If you require any help with your product, whether it
is a Warranty claim, spare part or user information, please
phone our Help Line for an immediate response. Phone
1300 880 001 inAustralia or 0800 445 721 in New Zealand.
Wear hearing protection.
Wear eye protection.
Wear breathing protection.
Introduction
Your new GMC power tool will more than satisfy your
expectations. It has been manufactured under stringent GMC
Quality Standards to meet superior performance criteria.
Double insulated for additional protection.
Conforms to relevant standards for
electromagnetic compatibility.
You will find your new tool easy and safe to operate, and, with
proper care, it will give you many years of dependable service.
CAUTION. Carefully read through this entire Instruction
Manual before using your new GMC Power Tool.
Take special care to heed the Cautions and Warnings.
Specifications
Nominal voltage:
230–240Vac ~ 50Hz
1200W
4000 - 10,500min-1
Double insulated
125mm
Input power:
Your GMC power tool has many features that will make your
job faster and easier. Safety, performance, and dependability
have been given top priority in the development of this tool,
making it easy to maintain and operate.
Variable speed:
Insulation class:
Disc size:
Spindle:
M14
Environmental protection
Disc bore diameter:
Sound pressure level:
Weight:
22.2mm
Recycle unwanted materials instead of
disposing of them as waste.All tools, hoses
and packaging should be sorted, taken to the
local recycling centre and disposed of in an
environmentally safe way.
95 dB(A)
2.7kg
3
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Personal safety
Safety instructions
• Stay alert, watch what you are doing and use common
sense when operating a power tool. Do not use a power
tool while you are tired or under the influence of drugs,
alcohol, or medication. Amoment of inattention while
operating power tools may result in serious personal injury.
WARNING. Read and understand all instructions. Failure to
follow all instructions listed below may result in electric shock,
fire and/or serious injury. The term “power tool” in all of the
warnings below refers to your mains-operated (corded) power
tool or battery-operated (cordless) power tool.
• Use safety equipment. Always wear eye protection. Safety
equipment such as a dust mask, non-skid safety shoes, hard
hat, or hearing protection used for appropriate conditions will
reduce personal injuries.
Save these instructions
Work area
• Keep work area clean and well lit. Cluttered and dark areas
invite accidents.
• Avoid accidental starting. Ensure the switch is in the off-
position before plugging in. Carrying power tools with your
finger on the switch or plugging in power tools that have the
switch on invites accidents.
• Do not operate power tools in explosive atmospheres,
such as in the presence of flammable liquids, gases, or
dust. Power tools create sparks which may ignite the dust or
fumes.
• Remove any adjusting key or wrench before turning
the tool on. A wrench or a key that is left attached to a
rotating part of the power tool may result in personal injury.
• Keep children and bystanders away while operating a
power tool. Distractions can cause you to lose control.
Electrical safety
• Do not overreach. Keep proper footing and balance at
all times. This enables better control of the power tool in
unexpected situations.
• Power tool plugs must match the outlet. Never modify the
plug in any way. Do not use any adapter plugs with earthed
(grounded) power tools. Unmodified plugs and matching outlets
will reduce risk of electric shock.
• Dress properly. Do not wear loose clothing or jewellery.
Keep your hair, clothing and gloves away from moving parts.
Loose clothes, jewellery or long hair can be caught in moving
parts.
• Avoid body contact with earthed or grounded surfaces
such as pipes, radiators, ranges and refrigerators. There
is an increased risk of electric shock if your body is earthed or
grounded.
• If devices are provided for the connection of dust
extraction and collection facilities ensure that these are
connected and properly used. Use of these devices can
reduce dust-related hazards.
• Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of electric
shock.
Power tool use and care
• Do not abuse the cord. Never use the cord for carrying,
pulling or unplugging the power tool. Keep cord away from
heat, oil, sharp edges or moving parts. Damaged or entangled
cords increase the risk of electric shock.
• Do not force the power tool. Use the correct power tool
for your application. The correct power tool will
do the job better and safer at the rate for which it
was designed.
• When operating a power tool outdoors, use an outdoor
extension cord suitable for outdoor use. Use of a cord
suitable for outdoor use reduces the risk of
electric shock.
4
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• Do not use the power tool if the switch does not turn it
on and off. Any power tool that cannot be controlled with the
switch is dangerous and must be repaired.
Additional safety rules for angle grinders
• Fully unwind cable drum extensions to avoid potential
overheating.
• Disconnect the plug from the power source before
making any adjustments, changing accessories, or
storing power tools. Such preventive safety measures
reduce the risk of starting the power tool accidentally.
• When an extension cable is required, you must ensure that it
has the right ampere rating for your power tool and is in safe
electrical condition.
•Always switch off before you put the angle grinder down.
• Do not let anyone under 18 years operate this tool.
• Store idle power tools out of the reach of children and
do not allow persons unfamiliar with the power tool or
these instructions to operate the power tool. Power tools
are dangerous in the hands of untrained users.
• Rags, cloths, cord, string and the like should never be left
around the work area.
• If you are interrupted when operating the tool, complete the
process and switch off before looking up.
• Maintain power tools. Check for misalignment or binding of
moving parts, breakage of parts and any other condition that
may affect the power tool’s operation. If damaged, have the
power tool repaired before use. Many accidents are caused
by poorly maintained power tools.
• Periodically check that all nuts, bolts and other fixings are
properly tightened.
• Check the disc before mounting it into the angle grinder. Check
by striking it with a wooden handle whilst balancing the disc on
your finger. Listen for the ring and do not use if dull, as the disc
may be cracked.
• Keep cutting tools sharp and clean. Properly maintained
cutting tools with sharp cutting edges are less likely to bind
and are easier to control.
• Use the power tool, accessories and tool bits etc.,
in accordance with these instructions and in the manner
intended for the particular type of power tool, taking
into account the working conditions and the work to be
performed. Use of the power tool for operations different
from intended could result in a hazardous situation.
• When the disc is installed, run it for at least one minute to
ensure that it does not have a fault. It is always advisable to
stay out of the line of the disc when testing or when using the
tool.
• Do not use a disc marked with a lower RPM than that of the
no load speed shown on the rating plate.
Service
• Use discs only of the prescribed diameter.
• Have your power tool serviced by a qualified repair
personnel using only identical replacement parts.
This will ensure that the safety of the power tool is
maintained.
• Do not use the angle grinder for buffing or polishing under any
circumstances.
• Never try to operate the angle grinder without the guard in
place.
• Do not secure the angle grinder in a vice or work bench and
use it as a static grinder. It can lead to serious injury.
• Never apply excessive pressure to the disc. It might shatter
causing personal injury.
• Ensure the work piece to be ground or cut, is held tight in the
vice or other clamping system.
5
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•Always use the front handle and ensure a good grip on the
grinder housing with one hand and the handle with the other
hand before proceeding with any work.
Contents of carton
The GMCAG125MAGAngle Grinder is supplied with the
following accessories as standard:
• Make sure that the disc is not in contact with the work when
you start the grinder.
• Pin wrench
• Side handle
• Be careful not to damage the spindle or either of the disc
flanges. Damage to these parts could result in disc breakage.
• 125mm metal cutting disc
• Instruction manual
• Do not press the spindle lock button whilst the spindle is
turning.
Unpacking
• Only use good quality grinding and cut off discs. Cheap poor
quality discs tend to glaze up which loads the motor and can
damage it. Use discs for their designated purpose only. For
instance, do not use cutting discs for grinding or metal wheels
on masonry.
Due to modern mass production techniques, it is unlikely that
your GMC Power Tool is faulty or that a part is missing. If you
find anything wrong, do not operate the tool until the parts have
been replaced or the fault has been rectified. Failure to do so
could result in serious personal injury.
• Watch out for flying sparks. Hold the tool at an angle of
approximately 15º to 30º to the work piece surface.
• Let the disc do the grinding or cutting at a reasonable feed, as
overloading will occur if too much pressure is applied and the
disc slows resulting in inefficient cutting and possible damage
to the motor.
• When using the grinder, use safety equipment including safety
goggles or shield, ear protection, dust mask and protective
clothing including safety gloves.
ALWAYS WEAR EYE PROTECTION
Wear goggles
Wear hearing protection
Wear a breathing mask
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Know your product
Before using the angle grinder, familiarise yourself with all the
operating features and safety requirements.
Use the tool and accessories only for the applications intended.
All other applications are ex
2
7
13
1. On/off switch
6
8
2. Power lock-on button
3. Spindle lock button
4. Disc guard
5. Front handle
3
6. Mounting points for
the handle
1
7. LED Overload
protection system
8. Motor housing
9. Pin wrench
10. Outer flange
11. Disc
14
4
12. Inner flange
5
13. Variable speed dial
with soft start
14. Quick release guard lever
Disc assembly showing flange requirements
Depressed disc (thicker than 4mm)
Depressed disc (4mm or less in thickness)
12
12
11
11
Raised inner
part facing
away from
the disc
Raised inner
part facing
the disc
10
9
10
9
7
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Setting up
Operation
Multi-position front handle
This angle grinder can be used for grinding and cutting steel,
stone or ceramic workpieces such as pipe, box section,
rectangular, angle iron steel bar,
house bricks and tiles. Do not
Screw the front handle (5) into the
most suitable mounting port (6)
(left side or right side) to suit the
application. Ensure that the handle
is fully screwed in place and firm.
attempt to grind wood or a soft
metal such as lead. The material
will quickly “fill” the disc and render
it useless.
Disc guard
WARNING. Switch off the grinder and disconnect it from the
power point.
Before starting the grinder first
ensure that the disc, disc guard and
tool are in good condition.
NOTE. Grinding operations normally require the angle grinder
to be held with the grinding disc parallel to the plane of the
workpiece whilst cutting operations normally require the angle
grinder to be held with the cutting disc at right angles to the
workpiece. Take the time to find the best combination of front
handle and slimline handle positions to suit the task on hand. It
can make a considerable difference to the levels of convenience
and safety of operation.
Position the guard (4) as described in the disc guard section so
that it will deflect hot sparks away from the operator.
Switching on and off
1. Plug the power cord into the power point.
2. Start the tool by depressing the on/off trigger switch (1).
Release the trigger to stop the tool.
3. If you press the lock on button
(2) while the trigger switch is
depressed, the switch is kept in
the operating position. To release
the lock on button, press and
release the trigger switch.
1. Open the quick release guard lever (14).
4. Hold the grinder firmly while it
is switched on and only apply
gentle pressure to the workpiece.
Little more than the weight of the
tool should be applied to give the
best and most efficient material
removal. Forcing and excessive
pressure can cause dangerous
disc fracture or damage to
2. Position the lug on the inside of the central guard ring in the
vertical slot in the spindle cover and press the guard onto the
spindle cover.
3. Twist the guard to the
appropriate position for either
grinding or cutting.
the tool. Hold the grinder at
approximately 15° to 30º to the
work and move slowly.
4. Lock the guard in position with
the quick release guard lever.
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5. Once the grinding or cutting
is finished, pull in and release
the on/off switch (1) to stop the
grinder.
2. Use your finger or thumb to turn
the dial forwards to increase
the speed and backwards to
decrease it.
WARNING. Avoid flying sparks
and ensure they do not hit any
inflammable materials, as they are
very hot and could cause personal
injury or a fire.
3. Position “1” denotes the lowest
speed. Position “6” denotes the
highest speed.
30º
15º
NOTE. Using the correct speed for
the job increases the life of the disc.
WARNING. The disc continues to turn for a few seconds even
though the switch is turned off. Keep your hands well away from
the moving disc.
Variable speed with soft start
This grinder is fitted with soft start technology. This feature
operates when you start the tool by slowly increasing the power
to the selected speed. The soft start feature eliminates any “kick”
when the grinder is switched on. In conventional grinders without
soft start the switch is heated up instantly thus reducing the life
expectancy. The soft start feature ensures a longer life for the
tool.
Led overload protection system
Overloading the tool means the tool is being leaned on
excessively during use, slowing down the speed of the tool. As a
result of the motor slowing down, the internal fan does not work
to its full capacity.
1. The LED Overload protection system will alert you when it is
overloading.
Replacing a disc
CAUTION. Switch off the grinder and disconnect it from the
power point.
2. The grinder will warn you when
you are approaching overload by
flashing the Yellow light
1. Turn the angle grinder on to its back and press the spindle
lock button (3) and rotate the spindle until it locks.
3. If you continue to ignore the
yellow light or do not see it, the
red light will come on and the
grinder will immediately come to
a stop.
4. When this occurs, wait a brief moment then restart the
grinder, however, take additional care not to press on the tool
too much.
Variable speed
The variable speed feature of this grinder enhances the grinding
performance and saves the disc from undue wear.
2. Insert the pins of the wrench (9) into the holes in the outer
flange (10) and remove it and the old disc.
NOTE. Do not remove the inner flange (12).
1. The variable speed dial (13) is used to program the speed of
the disc. The speed should be adapted to the material being
grinded.
9
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WARNING. Do not use a disc marked with a lower RPM than
that of the Max no load speed shown on the rating plate.
CAUTION. Do not use excessive force to clamp the disc. It could
crack it and cause failure during use.
3. Clean the flanges and check the new disc.
WARNING. Do not immerse the disc into any type of lubricant
including water. This angle grinder is designed as a dry grinder/
cutter. Failure to observe this warning could result in a fatal
shock.
4. Holding the angle grinder with the spindle facing upwards,
check that the inner flange is on the spindle and correctly
located. The two machined flat sections must face the angle
grinder and locate in the appropriate position on the spindle.
Lubrication
5. Place the disc onto the spindle with the label facing the angle
grinder. The hole in the disc should locate onto the spindle and
fit firmly into the spigot section of the inner flange.
The grease in the gearbox will require replacement after
extensive use of the tool. Please go to a qualified service agent
to perform this service.
NOTE. Depending on whether the disc has a flat inner section or
a depressed inner section, proceed as follows.
Power cord maintenance
If the supply cord needs replacing, the task must be carried out
by the manufacturer, the manufacturer’s agent, or an authorised
service centre in order to avoid a safety hazard.
6. For discs with a flat inner section,
screw on the outer flange (10)
with the protruding spigot section
facing away from the disc.
Cleaning
7. For discs with a depressed inner
section, screw on the outer flange
with the protruding spigot section
facing the disc so that it locates in
the hole in the disc.
1. Keep the tool’s air vents unclogged and clean at all times.
2. Remove dust and dirt regularly. Cleaning is best done with a
rag. Wear safety goggles or an eye shield and gloves whist
cleaning.
3. Re-lubricate all moving parts at regular intervals.
4. Never use caustic agents to clean plastic parts.
8. Hand tighten the outer flange until
the disc is secure.
CAUTION. Do not use cleaning agents to clean the plastic parts
of the tool. Amild detergent on a damp cloth is recommended.
Water must never come into contact with the tool.
9. Press the spindle lock button and
tighten the flange with the wrench.
10. Turn the new disc by hand,
ensuring that it is tightly secured
and that it rotates fully and does
not wobble unduly.
General inspection
Regularly check that all the fixing screws are tight, particularly the
outer flange. They may vibrate loose over time.
11. Run the angle grinder
under no load for at least one
minute to ensure the new disc
is in good condition. Make sure
you are wearing all the safety
gear and that you face the
grinder away from you.
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11
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Carefully read the entire Instruction Manual
before using this product.
Before returning this product for a Warranty Claim or any other reason
Please Call 1300 880 001 (Australia) or 0800 445 721 (New Zealand)
When you make your call, please have the following information at hand:
GMC Product Type GMC Product Code
A GMC Service Engineer will take your call and, in most cases, will be able to
solve your problem over the phone.
You are welcome to use this phone-in service to make suggestions or give
comments about any GMC product.
With continuing product development changes may have occurred which render
the product received slightly different to that shown in this instruction manual.
The manufacturer reserves the right to change specifications without notice.
Note: Specifications may differ from country to country.
Helpline 1300 880 001 (Australia) or 0800 445 721 (New Zealand)
The GMC 777 Helpline operates from 7am to 7pm, 7 days a week (EST). This allows you to contact
GMC directly with any queries and technical questions you have regarding products.
Save this Manual for future reference
GMC Head Office:
45-55 South Centre Road, Melbourne Airport, Victoria, Australia 3045
Telephone (03) 8346 1100 Fax (03) 8346 1200
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