1000W 13mm
HAMMER DRILL
MX1G100
INSTRUCTION MANUAL
Black
Cyan
Magenta
Yellow
Code: MX1G100
Date: 060223
Edition: 07
Op: DCR
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Dear Customer
Description of symbols
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 in Australia or
The rating plate on your tool may show symbols. These
represent important information about the product or
instructions on its use.
Wear hearing protection.
Wear eye protection.
0800 445 721 in New Zealand.
Wear breathing protection.
Introduction
Double insulated
for additional protection.
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.
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.
Specifications
CAUTION. Carefully read through this entire Instruction
Manual before using your new GMC Power Tool. Take
special care to heed the Cautions and Warnings.
Voltage:
230–240V ~ 50Hz
1000W
Input power:
-1
No load speed:
Number of impacts:
Chuck size:
0 - 2800 min
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.
43200 BPM
13mm
Maximum drilling capacity:
Wood:
Steel:
25mm
10mm
Masonry: 13mm
Environmental protection
Net weight:
2.5kg
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.
3
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• 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.
Safety instructions
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.
Personal safety
• 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. A moment
of inattention while operating power tools may result in
serious personal injury.
Save these instructions
Work area
• Keep work area clean and well lit. Cluttered and dark
areas invite accidents.
• 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.
• 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.
• 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.
• Keep children and bystanders away while
operating a power tool. Distractions can cause you
to lose control.
Electrical safety
• 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.
• 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
• Do not overreach. Keep proper footing and balance at
all times. This enables better control of the power tool in
unexpected situations.
risk of electric shock.
• 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.
• 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.
• Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of
electric shock.
• 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 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.
4
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Power tool use and care
Service
• 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.
• 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 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 drills
• Wear ear protectors with impact drills. Exposure to noise
can cause hearing loss.
• Use auxiliary handles supplied with the tool. Loss of
control can cause personal injury.
• 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.
• If possible, always use clamps or a vice to hold
your work.
• 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.
• Always switch off before you put the drill down.
• Ensure that the lighting is adequate.
• Do not put pressure on the drill, such that it slows the
motor down. Allow the drill bit to cut without pressure. You
will get better results and you will be taking better care of
your tool.
• 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.
• Keep the area free of tripping hazards.
• Do not let anyone under 18 years operate this tool.
• Only use accessory bits in good condition.
• Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges are less
likely to bind and are easier to control.
• Before drilling, check that there is sufficient clearance for
the drill bit under the workpiece.
• 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.
• Do not touch the bit after operation. It will be very hot.
• Keep your hands away from under the workpiece.
• Never use your hands to remove sawdust, chips or waste
close by the bit.
• Rags, cloths, cord, string and the like should never be left
around the work area.
• Support the work properly.
• If you are interrupted when operating the drill, complete
the process and switch off before looking up.
5
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• Periodically check that all nuts, bolts and other fixings are
properly tightened.
Contents of carton
• Auxiliary handle
• Depth gauge
• 100 Drill and Bit accessories
12 x HSS drill bits
• When using the drill, use safety equipment including
safety glasses or shield, ear protectors, and protective
clothing including safety gloves. Wear a dust mask if the
drilling operation creates dust.
If in doubt, do not plug in the tool. Using a power source
with a voltage less than the nameplate rating is harmful to
the motor.
The tool must be used only for its prescribed purpose.
Any use other than those mentioned in this Manual will
be considered a case of misuse. The user and not the
manufacturer shall be liable for any damage or injury
resulting from such cases of misuse.
- 2 each of 2mm, 3mm, 4mm, 5mm, 5.5mm
and 6mm
6 x Wood drill bits
- 2 each of 4mm, 5mm & 6mm
66 x 25mm Screwdriver bits
- 3 each of slotted bits 3mm, 4mm, 5mm, 5.5mm,
6mm and 7mm
To use this tool properly, you must observe the safety
regulations, the assembly instructions and the operating
instructions to be found in this Manual. All persons who use
and service the machine have to be acquainted with this
Manual and must be informed about its potential hazards.
Children and frail people must not use this tool. Children
should be supervised at all times if they are in the area in
which the tool is being used. It is also imperative that you
observe the accident prevention regulations in force in your
area. The same applies for general rules of occupational
health and safety.
- 3 each of phillips #0, #1, #2 and #3
- 3 each of pozi #0, #1, #2 and #3
- 1 each of star T10,T15,T20,T25,T30 and T40
- 1 each of square S0,S1,S2 and S3
- 1 each of hex metric 2mm, 2.5mm, 3mm, 4mm,
5mm, 6mm and 7mm
- 1 each of hex imperial 5/64”, 3/32”, 1/8”, 5/32”,
3/16”, 1/4” and 9/32”
6 x 50mm Screwdriver bits
- 1 each of slotted 4mm, 5mm and 6mm
- 1 each of phillips #1, #2 and #3
9 Nut drivers
The manufacturer shall not be liable for any changes made
to the tool nor for any damage resulting from such changes.
Even when the tool is used as prescribed it is not possible
to eliminate all residual risk factors. The following hazards
may arise in connection with the tool’s construction and
design:
- 1 each of 5mm, 6mm, 7mm, 8mm, 9mm,
10mm, 11mm, 12mm and 13mm
1 Screwdriver bit holder
• Damage to the lungs if an effective dust mask is
not worn.
Unpacking
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.
• Damage to hearing if effective ear protectors are
not worn.
6
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Know your product
1. Keyless chuck
2. Auxiliary handle
3. Depth gauge
4. Drilling/hammer mode selector
5. Lock-on button
6. Forward/Reverse selector
7. Variable speed trigger switch
8. Speed dial
9
4
6
9. Spindle lock button
3
1
5
7
8
2
7
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Auxiliary handle and
depth gauge
Inserting and
removing bits
1. Turn the auxiliary handle (2)
anti-clockwise to loosen the
collar and slip it over the chuck
onto the drill.
CAUTION. Always ensure that
the drill is switched off and
the plug is removed from the
power point before making any
adjustments.
2. Insert the depth gauge (3)
in the hole at the top of the
handle (2).
The drill is fitted with a keyless
chuck for easier tightening and
more grip torque.
3. The auxiliary handle can swivel
360° for the most comfortable
position and easiest operation.
1. Open the chuck jaws by
pressing down the spindle lock
button (9), firmly holding the
keyless chuck (1) and rotating
the housing in an anti-clockwise
direction.
4. The depth gauge helps keep
an accurate depth when drilling
holes to a set depth.
5. To change the position of the
depth gauge, turn the handle
grip anti-clockwise until the depth
gauge is loose enough to slide
through the hole.
2. Open the jaws sufficiently so
as to fit the desired accessory.
Ensure the accessory is
inserted so the jaws clamp
securely on the smooth section
of the drill bit.
6. Set the depth, checking the
depth with a steel rule for most
accurate measurement and then
turn the handle grip clockwise
to tighten both the depth stop
and the auxiliary handle in the
required position.
3. To firmly clamp the accessory
in the chuck, grasp the chuck
housing and rotate the chuck
housing in a clockwise direction
until you hear the “click”.
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Operation
Reversing the direction
of rotation
1. Operate the forward/reverse
selector (6) on the top of
the drill.
Starting and stopping
Operational controls
1. Ensure that the tool is in
good condition.
2. Push the selector to the
position for forward action.
2. Plug the cordset into the
mains socket.
3. Push the selector to the
position for reverse action.
3. Depress the trigger switch (7)
to start the drill and release the
trigger when you wish to stop.
CAUTION. Any attempt to
reverse the direction of rotation
while the drill is turning is likely
to permanently damage the
switch.
4. Press the lock-on button (5)
whilst the trigger is depressed
if you require continuous
operation. To disengage the
lock-on switch, press the trigger
then release it.
Drilling/hammer mode selector
You can use the drill for both hammer action
and normal drilling.
Variable speed trigger switch
1. You can adjust the speed of the drill between zero
and maximum by varying the pressure on the trigger.
The harder you press on the trigger the faster the drill
will operate.
1. Use the drilling/hammer mode
selector (4) to select hammer or
drill action. The type of drilling
selected is indicated by the
symbol on each side of the drill.
Speed adjustment
2. Push the selector to for
hammer action.
1. You can change the maximum
speed setting by turning the
speed dial (8) located on the
trigger switch.
3. Push the selector to for
drill action.
CAUTION. Change the mode of action only when the drill
has come to a complete standstill.
NOTE. Hammer action drilling should only be preformed in
the forward direction.
9
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Chuck replacement
Hints for use
NOTE. When drilling into masonry the drilling rate is fast
and burnout of the tip will occur if the drill bit is not
constantly cleared.
• Use only correctly sharpened drill bits, which are suitable
for the material being drilled.
Always wear eye protection.
Chuck removal
The chucks of reversible drills are always fixed by a screw
with left-hand thread. The screw, which is located in the
centre of the chuck, must be removed before the chuck can
be removed.
• To drill hard materials, firm pressure is required on the
power tool. However, excessive pressure does not
improve performance and places unnecessary pressure
on the tool and its bit.
1. Tighten the chuck around the shorter end of a hex key
(not supplied) of 1/4” or greater size. Using a wooden
mallet or similar object, strike the longer end in the
clockwise direction. This will loosen the screw inside the
chuck.
• When screw driving always use a pilot hole and set the
speed dial to low. Press firmly on the screw head and pull
the trigger gradually increasing the speed. It is always
wiser to test the screw driving on a scrap piece of the
same material you are using.
2. Open chuck jaws fully.
3. Insert a screwdriver into front of chuck between jaws to
engage screw head. Remove screw by turning clockwise.
• Larger diameter holes in hard wood, steel and concrete
have to be drilled at slower speeds. However, the motor
must not be struggling with the operation. If the motor is
struggling DO NOT continue working, pull the drill clear of
the workpiece and run it on fast speed for a minute or so
allowing the motor time to cool down before you attempt
a little more of the work. If the job is too hard for the drill
do not continue otherwise permanent damage to the
motor will occur.
4. Place a hex key in chuck and
tighten. Using a wooden mallet or
similar object, strike key sharply in
the counterclockwise direction. This
will loosen the chuck so that it can
be unscrewed by hand.
Chuck installation
1. Screw the chuck on by hand as far as it will go and insert
screw (LH thread).
• Wire brushing or sanding should be carried out on the
highest speed.
2. Tighten the chuck around
the shorter end of a
1/4” or large hex key (not
supplied) strike the longer
end in the clockwise
direction with a wooden
mallet.
• Concrete drilling should be carried out on the highest
speed.
DO NOT overload motor when drilling concrete.
DO NOT use too much pressure as the hammer action
relies on the drill bit being able to move back and forward in
the hole being drilled.
3. Remove the hex key and open the jaws fully. Tighten the
screw in the centre of the chuck firmly.
Always clear the flutes of the drill bit by removing it from the
hole regularly.
10
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Wood drilling
Masonry drilling
• For maximum performance use tungsten carbide-tipped
masonry impact bits when drilling holes in brick, tile,
concrete, etc.
• For maximum performance, use high speed steel bits for
wood drilling.
• Move drilling mode selector to drilling mode
.
• Move drilling mode selector to hammer mode
.
• Secure the workpiece to prevent it from turning when
drilling.
• Apply light pressure and medium speed for best results
in brick.
• Begin drilling at a very low speed to prevent the bit from
slipping off the starting point. Increase the speed as the
drill bit bites into the material.
• Apply additional pressure and high speed for hard
materials such as concrete.
• When drilling through holes, place a block of wood behind
the workpiece to prevent ragged or splintered edges on
the back side of the hole.
• When drilling in tile, practice on a scrap piece to
determine the best speed and pressure.
Cleaning
• Do not lock the trigger in the ‘on’ position when the drill
may need to be stopped suddenly.
1. Keep your machine and its cord clean. The outside of the
machine can be cleaned using a damp soft cloth with a
mild detergent if required.
Metal drilling
• For maximum performance, use high speed steel bits for
metal or steel drilling.
2. Some maintenance products and solvents may damage
the plastic parts; these include products containing
benzene, trichloroethylene, chloride and ammonia.
• Move drilling mode selector to drilling mode
.
3. Excessive sparking generally indicates the presence of
dirt in the motor or abnormal wear on the carbon brushes.
• Use a centre punch to mark the hole location on
the workpiece.
4. Take special care to keep the ventilation inlets/outlets free
from obstruction; cleaning with a soft brush followed by
a compressed air jet will usually be sufficient to ensure
acceptable internal cleanliness.
• Begin drilling at a very low speed to prevent the bit from
slipping off the starting point.
• Maintain a speed and pressure which allows cutting
without overheating the bit. Applying too much
pressure will:
5. Wear eye protection when carrying out cleaning.
CAUTION. Do not use cleaning agents to clean the plastic
parts of the drill.
- Overheat the drill
- Wear the bearings
Power cord maintenance
- Bend or burn bits
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.
- Produce off-centre or irregular shaped holes
• When drilling large holes in metal it is recommended to
drill with a small bit at first, then finish with a larger bit.
Also, lubricate the bit with oil to improve drilling action
and increase bit life.
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)
and enter your receipt details.
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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