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INSTRUCTION MANUAL
• Melbourne • Perth • Auckland • Hong Kong • Shanghai
• Taipei • New York • Verona • London • Paris
Air Impact
Wrench Kit
1/2” Square Drive
ATIW1/2K
031 117 PR ED 04
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Contents
Full 2 Years Home Use Warranty
Whilst every effort is made to ensure your complete
satisfaction with this tool, occasionally, due to the mass
manufacturing techniques, a tool may not live up to our
required level of performance and you may need the
assistance of our service department.
This product is warranted for a 2-year period for home
domestic use from the date of the original purchase. If
found to be defective in materials or workmanship, the
tool or the offending faulty component will be replaced
free of charge with another of the same item. A small
freight charge may apply.
The warranty replacement unit is only made available by
returning the tool to the place of purchase with a
confirmed register receipt. Proof of purchase is essential.
We reserve the right to reject any claim where the
purchase cannot be verified.
This warranty does not include damage or defects to the
tool caused by or resulting from abuse, accidents,
alterations or commercial or business use.
It also does not cover any bonus accessories unless the
tool is a GMC Platinum Professional model.
Please ensure that you store your receipt in a safe place
.
Conditions apply to the above warranty.
If you need direction of what constitutes a free of
charge warranty claim, please review the guide given on
the rear of the Receipt Holder. An indication is given as
to the types of claim that are permissible, and those
that are not.
Warranty 2
Introduction 3
Environmental protection 3
Scope of product 3
Description of symbols 3
Specifications 3
General safety instructions 3
Risk of eye or head injury 5
Risk of fire or explosion 5
Risk of loss of hearing 5
Risk to breathing inhalation hazard 6
Risk to injury 6
Risk of electric shock 8
Risk of entanglement 8
Risk of cut or burns 8
Additional safety instructions
for impact wrenches 9
Operation 9
Maintenance 9
Air Motor Lubrication 9
Impact Mechanism Lubrication 9
Air Supply 10
Air Hose 10
Storage 10
Adjustable Speed Control 10
General inspection 10
Cleaning 10
Repairs 10
Troubleshooting 11
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Dear Customer
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 0800 445 721 in New Zealand.
Introduction
Your new GMC tool will more than satisfy your expectations.
It has been manufactured under stringent GMC Quality
Standards to meet superior performance criteria.
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 Tool. Take special care
to heed the Cautions and Warnings.
Your GMC 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.
Environmental protection
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.
Scope of product
This product is suited for home and camping applications.
It will allow you to power outdoor lights, sound system,
small television and recharges your car battery.
Description of symbols
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.
Wear breathing protection.
Specifications
Square Drive: 1/2”
Free Speed: 7,000RPM
Max Torque: 260FT/LB Reverse
230FT/LB Forward
Air Cons: 4CFM@90PSI
Air Inlet: 1/4”PT
Net Weight: 2.04Kg
Impact Mechanism: Rocking Dog
General safety instructions
To use these air tools 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 infirm people must not use these
tools. Children should be supervised at all times if they
are in the area in which the tools are 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.
Warning. When using air operated tools, basic safety
precautions should always be taken to reduce the risk of
fire, electric shock and personal injury. Also, please read
and heed the advice given in the additional important
safety instructions.
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1. Keep the work area clean and tidy. Cluttered work
areas and benches invite accidents and injury.
2. Consider the environment in which you are working.
Do not use air tools in damp or wet locations. Keep the
work area well lit. Do not expose air tools to rain. Do
not use air tools in the presence of flammable liquids
or gases.
3. Keep visitors away from the work area. All visitors
and onlookers, especially children and infirm persons,
should be kept well away from where you are working.
Do not let others in the vicinity make contact with the
tool or air hose.
4. Store tools safely. When not in use, tools should be
locked up out of reach.
5. Do not force the tool. The tool will do the job
better and safer working at the rate for which it was
designed.
6. Use the correct tool for the job. Do not force small
tools or attachments to do the job best handled by a
heavier duty tool. Never use a tool for a purpose for
which it was not intended.
7. Dress correctly. Do not wear loose clothing or
jewellery. They can be caught in moving parts. Rubber
gloves and non- slip footwear are recommended
when working outdoors. If you have long hair, wear a
protective hair covering.
8. Use safety accessories. Safety glasses and earmuffs
should always be worn. A face or dust mask is also
required if the sanding operation creates dust.
9. Do not abuse the air hose. Never carry the air tool
by the air hose. Keep the air hose away from heat, oil
and sharp edges.
10. Secure the work piece. Use clamps or a vice to hold
the work piece. It is safer than using your hand and
frees both hands to operate the tool.
11. Do not overreach. Keep your footing secure and
balanced at all times.
12. Look after your tools. Keep tools sharp and
clean for better and safer performance. Follow the
instructions regarding lubrication and accessory
changes. Inspect air hose periodically and, if
damaged, have it replaced. Keep tool handles dry,
clean and free from oil and grease.
13. Disconnect idle tools. Disconnect air tools from the
air hose before servicing, when changing accessories
and when the tool is not in use.
14. Remove adjusting keys and wrenches. Check to see
that keys and adjusting wrenches are removed from
the tool before switching on.
15. Avoid unintentional starting. Do not carry a
connected air tool with your finger on the trigger.
16. Stay alert. Watch what you are doing. Use common
sense. Do not operate an air tool when you are tired.
17. Check for damaged parts. Before using a tool, check
that there are no damaged parts. If a part is slightly
damaged, carefully determine if it will operate
properly and perform its intended function. Check for
alignment of moving parts, binding of moving parts,
breakage of parts, proper mounting and any other
conditions that may affect the operation of the tool.
A part that is damaged should be properly repaired
or replaced by an authorised service facility, unless
otherwise indicated in this Instruction Manual.
18. Guard against electric shock. Prevent body contact
with grounded objects such as water pipes, radiators,
cookers and refrigerator enclosures.
19. Use only approved parts. When servicing, use only
identical replacement parts. Use an authorised service
facility to fit replacement parts.
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Important safety instructions
Risk of eye or head injury
What could happen How to prevent it
• Air powered equipment are capable of propelling
materials such as fasteners, metal chips, saw dust, and
other debris at high speed, which could result in serious
eye injury.
• Tool attachments can become loose or break and fly
apart propelling particles at the operator and others in
the work area.
• Compressed air can be hazardous. The air stream can cause
injury to soft tissue areas such as eyes, ears, etc. Particles
or objects propelled by the stream can cause injury.
• Always wear safety glasses with side shields.
• Never leave operating tool unattended. Disconnect air
hose when tool is not in use.
• For additional protection use an approved face shield in
addition to safety glasses.
• Make sure that any attachments are securely assembled.
Risk of fire or explosion
What could happen How to prevent it
• Abrasive tools such as sanders and grinders, rotating
tools such as drills, and impact tools such as nailers,
staplers, wrenches, hammers, and reciprocating saws
are capable of generating sparks which could result in
ignition of flammable materials.
• Exceeding the maximum pressure rating of tools or
accessories could cause an explosion resulting in serious
injury.
• Never operate tools near flammable substances as
gasoline, cleaning solvents, etc.
• Work in a clean, well ventilated area.
• Never use oxygen, carbon dioxide or other gases as a
power source for air tools.
• Use compressed air regulated to a maximum pressure at
or below the rated pressure of any attachments.
• Never connect to an air source that is capable of
exceeding 200 psi.
• Always verify prior to using the tool that the air source
has been adjusted to the rated air pressure range.
Risk of loss of hearing
What could happen How to prevent it
• Long term exposure to noise produced from the operation
of air tools can lead to permanent hearing loss.
• Always wear hearing protection.
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Risk to breathing inhalation hazard
What could happen How to prevent it
• Abrasive tools, such as grinders, sanders, and cut-off
tools generate dust and abrasive materials which can
be harmful to human lungs and respiratory system.
• Some materials such as adhesives and tar, contain
chemicals whose vapors could cause serious injury with
prolonged exposure.
• Always wear a face mask or respirator when using such
tools.
• Always work in a clean, dry, well ventilated area.
Risk to injury
What could happen How to prevent it
• Tools left unattended with the air hose attached, can
be activated by unauthorized persons leading to their
injury or injury to others.
• Air tools can propel fasteners or other materials
throughout the work area.
• A wrench or a key that is left attached to a rotating
part of the tool increases the risk of personal injury.
• Using inflator nozzles for duster applications can cause
serious injury.
• Air tools can become activated by accident during
maintenance or tool changes.
• Air tools can cause the workpiece to move upon
contact leading to injury.
• Remove air hose when tool is not in use and store tool
in secure location away from reach of children and or
untrained users.
• Use only parts, fasteners, and accessories recommended
by the manufacturer.
• Keep work area clean and free of clutter.
• Keep children and others away from work area during
operation of the tool.
• Keep work area well lit.
• Remove adjusting keys and wrenches before turning the
tool on.
• DO NOT use inflator nozzles for duster applications.
• Remove air hose to lubricate or add grinding
attachments, sanding discs, drills, etc. to the tool.
• Never carry the tool by the hose.
• Avoid unintentional starting. Don’t carry an air tool which
is connected to an air hose, with your finger on the trigger.
• Repair servicing should be done only by an authorized
service representative.
• Use clamps or other devices to prevent movement.
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Risk to injury (cont.)
• Loss of control of the tool can lead to injury to self or
others.
• Poor quality, improper, or damaged tools such as
grinding wheels, chisels, sockets, drills, nailers, staplers,
etc., can fly apart during operation, propelling particles
throughout the work area causing serious injury.
• Fasteners could ricochet or be propelled causing serious
injury or property damage.
• Improperly maintained tools and accessories can cause
serious injury.
• There is a risk of bursting if the tool is damaged. • Check for misalignment or binding of moving parts,
• Use only accessories identified by the manufacturer to
be used with specific tools.
• Never operate tool while under the influence of drugs
or alcohol.
• Don’t overreach. Keep proper footing and balance at all
times.
• Keep handles dry, clean, and free from oil and grease.
• Stay alert. Watch what you are doing. Use common
sense. Do not operate tool when you are tired.
• Always use tool attachments rated for the speed of the
air tool.
• Never use air tools which have been dropped, impacted
or damaged by use.
• Use only impact grade sockets on an impact wrench.
• Do not apply excessive force to the tool, let the tool
perform the work.
• Never point discharge of tool at self or others.
• Do not pull trigger unless tool contact safety device is
against work surface.
• Never attempt to drive fasteners into hard surfaces such
as steel, concrete, or tile.
• Take care to avoid driving a fastener on top of another
fastener.
• Position tool carefully so that fasteners will be delivered
to the proper location.
• Maintain the tool with care.
• Keep a cutting tool sharp and clean. A properly
maintained tool, with sharp cutting edges reduces the
risk of binding and is easier to control.
breakage of parts, and any other condition that affects
the tool’s operation. If damaged, have the tool serviced
before using.
• Use of an accessory not intended for use with the
specific tools, increases the risk of injury to persons.
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Risk of electric shock
What could happen How to prevent it
• Using air tools to attach electrical wiring may result in
electrocution or death.
• Contact with a “live” wire will also make exposed metal
parts of the tool “live” and may result in electrocution
or death.
• Fasteners coming in contact with hidden electrical
wiring may cause electrocution or death.
• Never use nailer/staplers to attach electrical wiring
while energized.
• Avoid body contact with grounded surfaces such as
pipes, radiators, ranges, and refrigerators. There is an
increased risk of electric shock if your body is grounded.
• Thoroughly investigate the workpiece for possible
hidden wiring before performing work.
Risk of entanglement
What could happen How to prevent it
• Tools which contain moving elements, or drive other
moving tools, such as grinding wheels, sockets, sanding
discs, etc. can become entangled in hair, clothing,
jewellery and other loose objects, resulting in severe
injury.
• Never wear loose fitting clothes, or apparel which
contains loose straps or ties, etc. which could become
entangled in moving parts of the tool.
• Remove any jewellery, watches, identifications,
bracelets, necklaces, etc. which might become caught
by the tool.
• Keep hands away from moving parts. Tie up or cover
long hair.
• Always wear proper fitting clothing and other safety
equipment when using this tool.
Risk of cut or burns
What could happen How to prevent it
• Tools which cut, shear, drill, staple, punch, chisel, etc.
are capable of causing serious injury
• Keep the working part of the tool away from hands and
body.
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Know your product
Before using the impact wrench, familiarise yourself with
all the operating features and safety requirements.
Use the tool only for the applications intended. All other
applications are expressly ruled out.
1.Drive anvil
2. Rubber nose guard
3. Body
4. Adjustable speed control
5. Contoured pistol grip
6. Air inlet
7. Exhaust port
8. Trigger
9. Impact mechanism oil port
1 2 3
4
8
9
5
6
7
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Additional safety instructions
for impact wrenches
This air impact wrench kit is designed for removing and
installing nuts and bolts. With one hammer (Rocking Dog)
impact mechanism and useful accessories, this kit is used
as a general purpose tool kit by DIYers and hobbyists.
1. This impact wrench is a part of a high pressure system.
Do not exceed maximum operating pressure of the air
tool (90PSI). The impact wrench could explore and may
result in death or serious injury.
2. Disconnect the impact wrench from air compressor
before changing tools or accessories, servicing and
during non-operation.
3. Always wear safety glasses and using hearing protection
during operation.
4. Do not wear loose fitting clothing and jewellery which
may become caught in moving parts and result in
serious injury.
5. Do not depress trigger when connecting the air hose.
6. Always use accessories fittings designed for use with air
tools. Use impact-quality sockets only. Do not use handtool sockets, damaged or worn accessories.
7. Never trigger the tool when not applied to a work object.
Accessories must be securely attached.
8. Make sure all connections are secure and check air hoses
for weak or worn condition before each use.
9. Disconnect air supply before installing or any maintenance.
Operation
Before each use:
• Drain water from air compressor tank and condensation
from air lines. Refer to your air compressor instruction
manual.
CAUTION: Disconnect the tool from the air supply before
lubricating or changing sockets.
• Lubricate tool, see “Maintenance” section in this manual.
CAUTION: Impact sockets and accessories must be used
with this tool. Do not use hand sockets and accessories.
• Select the required impact socket. This tool has a
1/2” square drive, use 1/2” deep sockets. Use 1/2”
extensions only when needed.
IMPORTANT: The use of air filters and air line lubricators is
recommended.
Maintenance
This impact wrench requires lubrication before initial use
and before and after each additional use throughout its life.
Air motor lubrication
1. Disconnect the impact wrench from the air supply and
hold the tool upside down.
2. Pull the trigger, put one teaspoon of air tool oil in the
air inlet lubricating the air motor the air inlet (6), and
then adjust the adjustable speed control (4) in both the
forward and reverse directions to help circulate oil in the
motor.
3. Reconnect the impact wrench to the air supply and
cover the exhaust port (7) with a towel and run in both
the forward and reverse directions for 20 seconds. Oil
will discharge from the exhaust port when air pressure
is applied. Any excess oil in the motor is immediately
expelled from the exhaust port. Always direct exhaust
port away from people or objects.
Impact mechanism lubrication
1. Disconnect the air impact wrench from the air supply.
2. Remove the allen head screw from the impact
mechanism oil port (9) hole on the right side of the tool
that has “OIL”.
3. Put three teaspoons of air tool oil in the oil port. Then,
replace the screw.
4. Reconnect the impact wrench with the air supply
and run for 20 seconds. Lubricate the whole impact
mechanism by rotating the tool upside down and
sideways while running the tool.
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5. Remove the screw and hold
the oil port hole over a
container to allow excess oil
to drain.
6. If the oil is dirty, repeat the
procedure above until the oil
comes out clear. Install the
screw and tighten. The residual
oil remaining in the impact
mechanism chamber is all that is needed for proper
lubrication
Air supply
Air supply MUST be greater than air requirement of the
tool. Recommended air compressor is 3/4HP tank for
intermittent use; 1.5HP or larger for heavier duty use
Storage
The impact wrench must be lubricated before storing.
Follow the air motor lubrication instructions. Only run for
3 seconds instead of 20 seconds because more oil needs to
remain in the tool when storing.
Adjustable speed control
This impact wrench is equipped
with a regulator for adjustable
speed control (4). This switch is
located at the rear of the tool.
The impact wrench should NEVER
be used to set torque. Use a
torque wrench to set the torque.
To remove nuts, set the regulator to the maximum setting.
To install nuts, set the regulator to the minimum to
medium setting. Do not over-tighten the nuts.
Forward and reverse directions are controlled by rotating
the speed control knob noted.
General inspection
1. Regularly check that all the fixing screws are tight.
2. The supply cord of the compressor should be checked
frequently for damage. If damaged, have the cordset
replaced by an authorised service facility to avoid a
hazard.
Cleaning
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 soft brush or a rag.
3. Re-lubricate all moving parts at regular intervals.
4. If the body of the air tool needs cleaning, wipe it with
a soft damp cloth. A mild detergent can be used but
nothing like alcohol, petrol or other cleaning agent.
5. Never use caustic agents to clean plastic parts.
CAUTION: Water must never come into contact with the tool.
Repairs
1. Only an authorised service centre should carry out
repairs on air tools.
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Troubleshooting
Trouble Possible cause(s) Suggested remedy(s)
Tool runs slowly or will not
operate.
1. No oil in tool. 1. Lubricate the tool according to the
lubrication instructions.
2. Grit or gum in tool. 2. Flush the tool with air tool oil, gum
solvent, or an equal mixture of motor
oil and kerosene.
3. Low air pressure. 3. a. Adjust the regulator on the tool to
the maximum setting.
b. Adjust the compressor regulator to tool
maximum the tool is running free.
4. Air hose leaks. 4. Tighten and seal hose fittings if leaks
are found.
5. Pressure drops. 5. a. Be sure the hose is the proper
size. Long hoses or tools using
large volumes of air may require
a hose with an I.D. of 1/2” or
larger depending on the total
length of the hose.
b. Do not use a multiple number of
hoses connected together with
quick connect fittings. This causes
additional pressure drops and
reduces the tool power.
6. Worn rotor blade. 6. Replace rotor blade.
7. Worn ball bearing. 7. Remove and inspect bearing for rust,
dirt and grit. Replace or clean and
regrease bearing with bearing grease.
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Troubleshooting (cont.)
Trouble Possible cause(s) Suggested remedy(s)
Moisture blowing out of
tool.
Impacts slowly or will not
impact.
Impacts rapidly but will
not remove bolts.
Does not impact.
1. Water in tank. 1. Drain tank. Oil tool and run until no
water is evident.
2. Water in air hoses. 2. a. Install a water filter.
b. Install an air dryer.
1. Lack of lubrication. 1. Lubricate the air motor and impact
mechanism.
2. Tool regulator set in wrong position. 2. Adjust the regulator on the tool to
the maximum setting.
3. Inline regulator too low. 3. Adjust regulators in the air system.
1. Worn impact mechanism. 1. a. Replace worn impact
mechanism components.
b. Return impact wrench for repair.
1. Broken impact mechanism. 1. a. Replace broken impact
mechanism components.
b. Return impact wrench for repair.
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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.
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
our products.
45–55 South Centre Road
Melbourne Airport
Victoria, Australia 3045
Tel: (03) 8346 1100 Fax: (03) 8346 1299
Save this Manual for future reference.
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