Information about the documentation
- Read this documentation before initial operation or use. This is a prerequisite for safe, trouble-free handling and use of the product.
- Observe the safety instructions and warnings in this documentation and on the product.
- Always keep the operating instructions with the product and make sure that the operating instructions are with the product when it is given to other persons.
Highlighting text passages
Designations and markings are indicated as follows:
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Description of marked operating controls on the fastening tool.
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« »
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Markings on the fastening tool
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Hilti products are designed for professional use and may be operated, serviced and maintained only by trained, authorized personnel. This personnel must be informed of any particular hazards that may be encountered. The product and its ancillary equipment may present hazards when used incorrectly by untrained personnel or when used not as directed.
The type designation and serial number are printed on the type identification plate.
- Write down the serial number in the table below. You will be required to state the product details when contacting Hilti Service or your local Hilti organization to enquire about the product.
Product information
Product information
Fastening tool, gas-actuated
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GX 3 | GX 3-ME
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Generation
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01
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Serial no.
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Description
- Fastener guide
- RESET button
- Inlet/outlet valve
- Cooling air slots
- Belt hook
- Trigger
- Grip
- Nail pusher
- Magazine lockbutton
- Support leg
- Magazine
- Type identification plate
- Gas can status indicator
- GAS button
- Gas can compartment
- Gas can compartment cover
The product described is a gas-actuated fastening tool (“fastening tool”). It is designed to drive suitable fasteners into concrete, steel, sand-lime block, concrete-block masonry, rendered masonry and other materials suitable for use of the direct fastening technique.
The fastening tool is for hand-held use or use with the pole tool extension (accessory) only.
Gas-actuated fastening tool with fastener guide, toolbox, operating instructions.
Other system products approved for use with this product can be found at your local
Hilti Center or online at:
www.hilti.group
The fastener guide holds the studs or, respectively, guides the nails and, when the tool is actuated, thus directs the fasteners into the supporting material at the desired position.
Two types of fastener can be driven by the fastening tool: nails and threaded studs. Additional fastening components, which can be inserted in the fastener guide, are also available for various applications.
Information about national regulations, and the
Fastening Technology Manual containing further information, are available from the
Hilti marketing organization responsible for your location.
The
Fastening Technology Manual can be found online at:
www.hilti.group
The slider can be used to reduce the depth to which the fastener is driven.
Status
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Meaning
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+
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Standard fastener driving depth
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‑
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Reduced fastener driving depth
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After driving a fastener, under certain circumstances, the fastener guide may not return to its outset position. This is caused by the piston being incorrectly positioned. The incorrect piston position can be remedied by pressing the
RESET button.
Status
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Meaning
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RESET button projects from the tool casing. Its white edge is visible.
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Piston position is incorrect
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RESET button is flush with the tool casing.
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Piston position is correct
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On an even working surface, the support leg makes it easier to hold the fastening tool perpendicular as attention then only has to be paid to lateral alignment. On an uneven or undulating surface it may be necessary to remove the support leg in order to allow the fastener guide to be held perpendicular to the working surface.
The belt hook can be extended in two stages.
Status
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Meaning
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First position
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Position for attaching to a waist belt
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Second position
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Position for attaching to ladders, scaffolds, platforms, etc.
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Observe the safety instructions provided with the gas can!
In order to operate the fastening tool, the gas can must be inserted in the gas can compartment.
The gas can status can be read from the LED display after pressing the
GAS button.
The gas can must be removed before breaks between working, before maintenance and before transporting or storing the fastening tool.
After pressing the
GAS button, the LED display indicates the status of the gas can.
The gas level indicator does not operate correctly if the fastener guide / tool nosepeice has been fully compressed.
Status
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Meaning
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All four LEDs light green.
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Level is approx. 100 %.
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Three LEDs light green.
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Level is approx. 75 %.
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Two LEDs light green.
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Level is approx. 50 %.
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One LED lights green.
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Level is approx. 25 %.
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One LED blinks green.
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Level is below 10 %. Replacement of the gas can is recommended.
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One LED lights red.
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There is either no gas can in the fastening tool, the wrong type of gas can is fitted or the can is empty.
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Even when the level is indicated as “empty”, the gas can, for technical reasons, still contains a little gas.
Disposal

Most of the materials from which
Hilti tools and appliances are manufactured can be recycled. The materials must be correctly separated before they can be recycled. In many countries, your old tools, machines or appliances can be returned to
Hilti for recycling. Ask
Hilti Service or your Hilti representative for further information.
- Do not dispose of power tools, electronic equipment or batteries as household waste!