Hilti GX120 User Manual

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GX 120

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Hilti Corporation

LI-9494 Schaan
Tel.: [phone]
Fax: [phone]
www.hilti.com

Operating instructions en
Mode d’emploi fr
Manual de instrucciones es
Istruzioni d’uso it
Brugsanvisning da
Bruksanvisning no
Bruksanvisning sv
Käyttöohje fi
Manual de instruções pt

Οδηγιες χρησεως

Kasutusjuhend et

el

zh

16

17

Hilti = registered trademark of Hilti Corp., Schaan W 3250 0507 4-Pos. 1 1 Printed in Liechtenstein © 2007
Right of technical and programme changes reserved S. E. & O.

274633 / A

*274633*

274633

GX 120 gas-driven fastening tool

It is essential that the operating instructions
are read before the tool is operated for the
first time.

Always keep these operating instructions
together with the tool.

Ensure that the operating instructions are
with the tool when it is given to other
persons.

Contents Page

1. General information 1

2. Description 2

3. Accessories, consumables 2

4. Technical data 3

5. Safety rules 4

6. Before use 6

7. Operation 7

8. Care and maintenance 9

9. Troubleshooting 9

10. Disposal 13

11. Manufacturer’s warranty ‐ tools 13

12. EC declaration of conformity 13

1. General information

1 These numbers refer to the corresponding illustra­tions. The illustrations can be found on the fold‐out
cover pages. Keep these pages open while studying
the operating instructions.
In these operating instructions, the designation “the
tool” always refers to the GX 120 gas‐driven fastening
tool.

Parts, operating controls and indicators 1

Grip

@

Lockbutton and power regulator

;

Nosepieces

=

Support leg

%

Magazine (40 nails or 20 nails)

&

Type identification plate

(

Gas can compartment

)

Gas can compartment cover

+

Ventilation slots

§

Locking lever

/

Trigger

:

Reset button

·

Nail pusher

$

Belt hook

£

Gas level indicator

|

en

1.1 Safety notices and their meaning

WARNING

Draws attention to a potentially dangerous situation
that could lead to serious personal injury or fatality.

CAUTION

Draws attention to a potentially dangerous situation
that could lead to slight personal injury or damage to
the equipment or other property.

NOTE

Draws attention to an instruction or other useful
information.

1.2 Explanation of the pictograms and other
information

Warning signs

General
warning

Obligation signs

Wear eye

protection.

Warning: hot

surface

Wear a hard

hat.

Wear ear

protection.

Wear

protective

gloves.

1

Symbols

Read the

en

operating

instructions

before use.

2. Description

2.1 Use of the product as directed

The tool is designed for driving specially manufac­tured nails (fasteners) into concrete, steel and other
materials suitable for the direct fastening technique
(please refer to the Fastening Technology Manual).
The tool is designed for professional use in fasten­ing applications in the drywall installation trade and
other building trades where fasteners are driven into
concrete, steel, sand‐lime block, concrete block and
rendered masonry.
The tool, gas can and fasteners form a single technical
unit. This means that the tool can achieve optimum
fastening performance only when used in conjunc­tion with the Hilti fasteners and gas cans specially

Location of identification data on the tool

The type designation and serial number can be found
on the type identification plate on the tool. Make a
note of this data in your operating instructions and
always refer to it when making an enquiry to your
Hilti representative or service department.

Type:

Serial no.:

designed and manufactured for it. The fastening and
application recommendations given by Hilti apply only
when these conditions are observed.
The tool is for hand‐held use only.
The tool may be operated, serviced and repaired
only by trained personnel. This personnel must be
informed of any special hazards that may be en­countered.
Modification of the tool is not permissible.
Observe the information printed in the operating in­structions concerning operation, care and mainten­ance.
The tool and its ancillary equipment may present
hazards when usedincorrectly by untrained personnel
or when used not as directed.

3. Accessories, consumables

Gas can GC 21/ GC 22
Nosepiece X‑120 TN
Additional nosepieces X‑120 WH (washers) / X‑120 PHD (Delta)/

X‑120 PHP (Platon)
Magazine
Support leg X‑120 SL
Set of pin punches
Tool clip

Nails Length In magazine strips of

X‑EGN 14MX
X‑EGN 18MX

14 mm (¹/₂") 10
18 mm (¹¹/₁₆") 10 Hard concrete /

2

X‑120 GM 40/ X‑120 GM 20

X‑120 NP set

X‑120 TS

For use on (please
contact Hilti for
detailed information)

Steel

precast concrete /
steel

Nails Length In magazine strips of

X‑EGN 20MX

X‑GN 20 MX

X‑GN 27 MX

X‑GN 32 MX

X‑GN 39 MX

20 mm (³/₄") 10 Hard concrete /

20 mm (³/₄") 10

27 mm (1") 10

32 mm (1 ¹/₄") 10

39 mm (1 ⁹/₁₆") 10

4. Technical data

Right of technical changes reserved.

For use on (please
contact Hilti for
detailed information)

precast concrete /
steel

Concrete / rendered
masonry (1cm / ³/₈")
/ sand‐lime block /
concrete block

Concrete / rendered
masonry (1cm / ³/₈")
/ sand‐lime block /
concrete block

Concrete / rendered
masonry (1cm / ³/₈")
/ sand‐lime block /
concrete block

Concrete / rendered
masonry (1cm / ³/₈")
/ sand‐lime block /
concrete block

en

Tool with magazine

Weight 3.8 kg (8.41 lbs)
Dimensions (L x W x H) 431 mm X 134 mm X 392 mm (17" x 5 ¼" x 15 ½")
Nail length Max. 39 mm (max. 1 ⁹/₁₆")
Nail diameter Ø 3mm(Ø 0.118 in) / Ø 2.6 mm (Ø 0.102 in)
Magazine capacity 40 + 2 nails or 20 + 2 nails
Contact movement
Operating temperature / ambient temperature with

GC 21 gas can
Operating temperature / ambient temperature with

GC 22 gas can
Maximum fastener driving rate
Energy‐equivalent acceleration, a

hw, RMS(3)

40 mm (1 ⁹/₁₆")

-5…+45°C (23 °F to 113 °F)

-10…+45°C (14°F to 113°F)

1,200/h

Recoil: Applicable to 1 mm sheet metal on B45

concrete: 4.04 m/s²

3

Noise information: Applicable to 1 mm sheet metal on B45 concrete

Sound power level, L

WA, 1S

Workplace‐relevant emission value, L

pAlmax

106 dB (A)

102 dB (A)

measured at operator ear level
Sound pressure level at the surface where readings

en

are taken, L

pA, 1s

93 dB (A)

Variations in operating conditions may cause

deviations from these emission values.

Gas can

Capacity 1 can for 750 nails
Recommended transport and storage temperature
Substances contained

+5…+25°C (41°F to 77°F)

Isobutane, propene
Gas can Not refillable
The gas can is pressurized. Protect the gas can from

the heat of the sun.

Never expose the gas can to temperatures over 50°C

(122°F).

5. Safety rules

5.1 Basic information concerning safety

In addition to the information relevant to safety
given in each of the sections of these operating
instructions, the following points must be strictly
observed at all times.

5.1.1 Personal safety

a) Stay alert, watch what you are doing and use

common sense when operating a direct fastening
tool. Do not use a toolwhile you aretired or under
the influence of drugs, alcohol or medication. A

moment of inattention while operating tools may
result in serious personal injury.

b) Avoid unfavorable body positions. Make sure you

work from a safe stance and stay in balance at
all times.

c) Never point the tool toward yourself or other

persons.

d) Never press the nosepiece of the tool against

your hand or against any other part of your body
(or other person’s hand or part of their body).

e) Keep other persons, especially children, away

from the area in which the work is being carried
out.

5.1.2 Fastening tool use and care

a) Use the right tool for the job. Do not use the tool

for purposes for which it was not intended. Use it
only as directed and when in faultless condition.

b) Press the tool against the working surface at

c) Never leave a loaded tool unattended.
d) Remove the gas can from the tool before trans-

e) Always unload the tool (remove the gas can and

f) When not in use, tools must be unloaded and

g) Check the tool or machine and its accessories for

h) Keep the arms slightly bent while operating the

i) Pull the trigger only when the tool is pressed

j) Always hold the tool securely and at right angles

right angles.

porting the tool.

fasteners) before cleaning, before carrying out
care and maintenance, before work breaks and
before storing the tool.

stored in a dry place, locked up or out of reach
of children.

damage and ensure that they function faultlessly
and as intended. Check that moving parts func­tion correctly without sticking and that no parts
are damaged. All parts must be fitted correctly
and fulfill all conditions necessary for correct op­eration of the tool or machine. Damaged guards,
safety devices and other parts must be repaired
or replaced properly at a Hilti service center
unless otherwise indicated in the operating in­structions.

tool (do not straighten the arms).

against the working surface at right angles.

to the working surface when driving a fastener.

4

This will help to prevent fasteners being deflec­ted by the working surface.

k) Never redrive a fastener. This may cause the

fastener to break and the tool may jam.

l) Never drive fasteners into existing holes unless

this is recommended by Hilti.

m)Always observe the application guidelines.

5.1.3 Work area safety

a) Ensure that the workplace is well lit.
b) Operate the tool only in well‐ventilated working

areas.

c) Do not attempt to drive fasteners into unsuitable

materials. Materials that are too hard, e.g. welded

steel and cast iron. Materials that are too soft, e.g.
wood and drywall panel (gypsum board). Materials
that are too brittle, e.g. glass and ceramic tiles.
Driving a fastener into these materials may cause
the fastener to break, shatter or to be driven right
through.

d) Before driving fasteners, check that no one is

present immediately behind or below the work­ing surface.

e) Keep the workplace tidy. Objects which could

cause injury should be removed from the working
area. Untidiness at the workplace can lead to

accidents.

f) Keep the grips dry, clean and free from oil and

grease.

g) Wear non‐skid shoes.
h) Take the influences of the surrounding area into

account. Do not expose the tool to rain or snow
and do not use it in damp or wet conditions. Do
not use the tool where there is a risk of fire or
explosion.

5.1.4 Mechanical hazards

a) Select the correct fastener guide and fastener

combination for the job on hand. Failure to use the

correct combination of these items may result in
damage to the tool and/or unsatisfactory fastening
quality.

b) Use only fasteners of a type approved for use

with the tool.

c) Never fill the magazine with fasteners unless it

is correctly fitted to the tool. The fasteners could
be ejected uncontrollably.

5.1.5 Thermal hazards

a) If the tool has overheated, allow it to cool down.

Do not exceed the recommended fastener driving
rate.

b) Always wear gloves if the tool has to be dis-

mantled for cleaning or maintenance before it
has been allowed to cool down.

5.1.6 Gasses

Liquid gas under pressure:
Observe the hazard warnings and first‐aid instruc­tions printed on the gas can and in the instructions
for use.
The gas is extremely flammable (contains: isobu­tane, propene).
Refilling the gas can is not permissible.

a) Do not use damaged gas cans.
b) Do not attempt to force the gas can open. Do not

incinerate or crush the can and do not attempt to
reuse it for any other purpose.

c) Never spray the gas toward persons or other

living beings.

d) Keep the gas away from all sources of ignition

such as naked flames, sparks, pilot lights, static
discharge and very warm surfaces.

e) Do not smoke while using the tool.

5.1.6.1 Storage

a) Do not store gas cans in inhabited rooms or in

rooms connected to inhabited rooms.

b) Store the gascans in adry, well‐ventilated place.
c) Store the gas cans out of reach of children.
d) Do not expose gas cans to direct sunlight or

temperatures above 50°C (122°F).

e) Recommended storage temperature: 5°C to 25°C

(41°F to 77°F).

en

5

5.1.6.2 First aid

Read the material safety data sheet for informa­tion about use, care and maintenance and first‐aid
measures.

a) Direct skin contact with the liquid gas may cause

en

frostbite or a serious freezing injury similar to a
burn.

b) In case of inhalation of the gas: The person

affected should be taken into the open air and
brought into a comfortable position.

6. Before use

NOTE

Read the operating instructions before using the tool.

6.1 Inserting nails 2

1. Pull the nail pusher back until it engages.

NOTE The nail pusher must engage in this posi­tion.

2. Slide the nails into the magazine (maximum of 4
strips of 10 nails).

c) In case of unconsciousness: Bring the person

affected into a secure recovery position. Should
the person stop breathing, apply artificial res­piration and supply oxygen if necessary.

d) In case of gas contact with the eyes: Rinse the

open eyes under running water for one minute.

e) In case of gas contact with the skin: Wash the

contact surface carefully with warm water and
soap. Subsequently apply a skin cream.

f) Consult a doctor if necessary.

5.1.7 Protective device

Never use the tool if the applicable safety devices
have been damaged or removed.

3. Release the nail pusher and allow it to slide
forward slowly.

6.2 Inserting the gas can 3

1. Open the cover.

2. Push the gas can into the gas can compartment,
valve first, until the clip engages.

3. Close the cover.

4. Press the tool against the working surface 3 times
without pulling the trigger.

6.3 Removing the gas can 4

1. Open the cover of the gas can compartment.

2. Press the can retaining clip.

3. Remove the gas can.

4. Close the cover of the gas can compartment.

6.4 Checking the gas can 5

NOTE

- To check the gas level in the can, press the button marked GAS. When doing so, take care to ensure that the
tool is not pressed against the working surface.

- Even when the indicator shows “empty”, a small quantity of gas, for technical reasons, still remains in the
can.

4 LEDs light green
constantly.

2 LEDs light green
constantly.

1 LED blinks green. The gas can is almost empty. The gas can should be

1 LED lights red con­stantly.

6

The gas can is full.

The gas can is half full.

changed.
The gas can is empty, no gas can fitted or wrong gas

can fitted.

7. Operation

NOTE

When holding the tool steady with the second hand,
the hand must be positioned in such a way that no
ventilation slots or openings are covered.

CAUTION
Never redrive a fastener. This may cause the
fastener to break and the tool may jam.

WARNING

Parts of the tool outside the grip area may get hot
when fasteners are driven at a rapid rate over a long
period of time. Wear protective gloves.

7.1 Operation 6

NOTE

It is possible to drive a fastener only when more than
3 nails are in the magazine.

1. Position the nose of the tool at right angles to
the working surface and then press it against the
working surface as far as it will go.

2. Drive the fastener by pulling the trigger.

3. After driving the fastener, lift the tool away com­pletely from the working surface.

en

WARNING

Material may splinter when the fastener is driven or
fragments of the magazine strip may fly off. Splinter­ing material presents a risk of injury to the eyes and
body. Wear protective glasses and a hard hat (tool

operator and bystanders).

CAUTION

The fastener is driven by the energy released on
ignition of a gas‐air mixture. Exposure to noise can
cause hearing loss. The operator and bystanders

must wear ear protectors.

WARNING

Never make the tool ready to fire by pressing it against
a part of the body (e.g. the hand). When the tool is
ready to fire, fasteners could be driven inadvertently
into parts of the body. Never press the tool against

parts of the body.

WARNING
Never pull the tool nosepiece back by the fastening
component inserted in it (e.g. soft washer, pipe
ring or clip etc.). This presents an increased risk of

accident.

WARNING
The tool must always be unloaded before changing
the magazine and before carrying out cleaning or
maintenance (see section “Unloading the tool”).

7.2 Gas level indicator 5

Please refer to section 6.4 “Checking the gas can (for
2 seconds)”.

7.3 Fitting and removing the magazine

7.3.1 Removing the magazine 7

1. Pull the nail pusher back until it engages.
NOTE The nail pusher must engage in this posi­tion.

2. Remove all fasteners from the magazine.

3. Release the nail pusher and allow it to slide
forward slowly.

4. Push the locking lever down toward the magazine.

5. Pivot the magazine forward away from the tool.

6. Disengage the magazine from the tool.

7.3.2 Fitting the magazine 8

1. Engage the magazine with the tool.
NOTE The locking lever must be in the open
position.

2. Guide the magazine toward the tool until the
shaped parts fit together.

3. Close the locking lever and check that it engages.

7.4 Nosepiece

7.4.1 Removing the nosepiece 9

1. Set the power regulator to “Eject”.

7

2. Remove the nosepiece.

7.4.2 Settings at the nosepiece

NOTE

When the power regulator is set to “+”, the nosepiece
is set to the standard fastener driving depth.

en

NOTE

When the power regulator is set to “‐”, the nosepiece
is set to the reduced fastener driving depth.

NOTE

If the nail is still driven too deeply when the power
regulator is set to “‐”, it may be necessary to use a
longer nail.

7.4.2.1 Setting the standard fastener driving
depth 

Set the power regulator to “+”.

7.4.2.2 Setting the reduced fastener driving
depth 

NOTE

This setting is suitable for fastening thin sheet metal
to soft materials (e.g. young / green concrete).

Set the power regulator to “‐”.

7.4.3 Fitting the tool nosepiece 

WARNING
Check to ensure that the tool is not loaded. The tool

could be made ready to fire inadvertently by pressing
the nosepiece in by hand.

1. Align the nosepiece with the slot in the tool.

2. Push the nosepiece onto the tool.

3. While holding the nosepiece with the hand, press
the tool against the working surface until the
nosepiece engages in position.

7.5 Support leg

7.5.1 Fitting the support leg 

1. Push the support leg into the slot in the magazine
at right angles.

2. Turn the support leg through 90° and engage it
in position.

7.5.2 Removing the support leg 

1. Release the support leg by pressing the spring
catch.

2. Turn the support leg through 90°.

3. Pull the support leg away from the magazine at
right angles.

7.6 Bringing the piston into the correct
position 

NOTE

The piston is incorrectly positioned when the tool
nosepiece has not extended to its original position
after the tool is lifted away from the working surface
and the reset button is projecting.

The piston can be returned to the correct position
by pressing the reset button. Fasteners can then be
driven. In exceptional cases, the tool may fire without
driving a fastener when the tool is operated for the
first time after resetting the piston.
Press the reset button.

7.7 Removing a jammed fastener 

1. Remove the magazine.

2. Remove the nosepiece.

3. Fit the nosepiece into the support supplied.

4. Use the pin punch to remove the fastener.

7.8 Unloading the tool

1. Open the cover of the gas can compartment.

2. Press the can retaining clip and remove the gas
can.

3. Close the cover of the gas can compartment.

4. Pull the nail pusher back until it engages.
NOTE The nail pusher must engage in this posi­tion.

5. Remove the fasteners from the magazine.

6. Release the nail pusher in the magazine and allow
it to slide forward slowly.

7.9 Application guidelines

NOTE

For detailed information, please ask the Hilti market­ing organization in your country for a copy of the
Hilti Fastening Technology Manual or the applicable
national regulations.

Concrete
A = min. distance from edge = 70 mm (2¾")
B = min. fastener center spacing = 80 mm (3¹/₈")
C = min. base material thickness = 100 mm (4")

8

B A

ET

C

Steel
A = min. distance from edge = 15 mm (⁵/₈")
B = min. fastener center spacing = 20 mm (¾")

8. Care and maintenance

WARNING
The tool must be unloaded (gas can and fasteners
removed from the tool) before carrying out cleaning
or maintenance.

CAUTION

The tool may get hot during use. You could burn your
hands. Wear protective gloves before carrying out

care and maintenance. Allow the tool to cool down.

8.1 Care of the tool 

CAUTION
Take care not to damage the piston detector, nail
detector and magazine detector.

1. Remove plastic debris from the nosepiece at
regular intervals.

2. Never operate the tool when the ventilation slots
are blocked. Clean the ventilation slots carefully
using a dry brush.

C = min. base material thickness = 4 mm (⁵/32")

B A

C

7.10 Belt hook 

The belt hook can be used to attach the tool in position
1 to a belt or in position 2 to a ladder or scaffold.

3. Do not permit foreign objects to enter the interior
of the tool.

4. Clean the outside of the tool at regular intervals
with a slightly damp cloth.

5. Do not use a spray, steam pressure cleaning
equipment or running water for cleaning.

6. Always keep the grip surfaces of the tool free from
oil and grease.

7. Do not use cleaning agentswhich contain silicone.

8. Do not use Hilti spray or similar lubricants or
cleaning agents.

8.2 Maintenance

Check all external parts of the tool for damage at
regular intervals and check that all controls operate
faultlessly. Do not operate the tool if parts are dam­aged or when the controls do not function faultlessly.
Have the tool repaired by Hilti Service.

8.3 Checking the tool after care and
maintenance

After cleaning or servicing, check that the power
regulator is correctly set (standard setting “+”) before
inserting the gas can.

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9. Troubleshooting

WARNING

The tool must be unloaded (gas can and fasteners removed from the tool) before carrying out cleaning or
maintenance.

9

Fault Possible cause Remedy

Fastener head stand‐off is
frequently too high.

en

The power regulator is set to “‐”. Set the power regulator to “+”.

The fastener used is too long. Use a shorter fastener.

The base material is too hard.

Use a DX fastening tool.

Fastener frequently driven too
deeply (punches through).

Fastener breakage.

Fasteners are bent.

The intake/exhaust valve is dirty or
covered over.

Driving power is too high.

The fastener is too short. Use a longer fastener.

The power regulator is set to “‐”. Set the power regulator to “+”.
The fastener used is too long. Use a shorter fastener.
The base material is too hard.
The tool is pressed against the

surface at an angle.

The power regulator is set to “‐”. Set the power regulator to “+”.

The fastener used is too long. Use a shorter fastener.

The tool is pressed against the
surface at an angle.

Clean the tool and pay attention to
the hand position.
Contact Hilti if the problem persists.

Set the power regulator to “‐”.

Use a DX fastening tool.
Hold the tool at right angles to the

working surface. Use the support
leg.
See section: 7.5 Support leg

Hold the tool at right angles to the
working surface. Use the support
leg.
See section: 7.5 Support leg

Fastener doesn’t hold in steel.

Gas can doesn’t last for the
whole box of fasteners.

10

The base material is not thick
enough (less than 4 mm).

Frequently pressing the tool against
the working surface without pulling
the trigger causes increased gas
consumption.

Use a different fastening technique.

Avoid pressing the tool against the
working surface without pulling the
trigger.

Fault Possible cause Remedy

The tool remains compressed
(does not extend when pres­sure is released).

Fastener driving failure rate
too high.

The tool doesn’t fire.

The piston is incorrectly positioned. Press the reset button.

See section: 7.6 Bringing the piston
into the correct position 

The nail detector is jammed; The
reset button still projects after it
has been pressed (white edge still
visible).

A fastener is jammed in the tool.

The tool is pressed against the
surface at an angle.

Wrong type of nail used. Use X‐GHP nails if necessary.
The base material is too hard.
The nail pusher is in the rearmost

position.

Insufficient number of fasteners in
the magazine (2 or less).

Fastener feed malfunction. Use a different strip of fasteners

The gas can is empty.

Remove the gas can and the
magazine from the tool and remove
any dirt or debris from the nail
detector.

Remove the magazine and the tool
nosepiece. Fit the tool nosepiece
into the support supplied and
use the pin punch to remove the
fastener.

CAUTION

Do not damage the tool nosepiece.
See section: 7.7 Removing a
jammed fastener 
See section: 7.3.1 Removing the
magazine 7
See section: 7.4.1 Removing the
nosepiece 9
See section: 7.8 Unloading the tool
Contact Hilti if the problem persists.
Hold the tool at right angles to the
working surface. Use the support
leg.
See section: 7.5 Support leg

Use a DX fastening tool.
Release the nail pusher.

See section: 7.3 Fitting and
removing the magazine

Reload fasteners.

(strip is possibly damaged).
Clean the magazine.
Check the gas level by pressing the
button marked GAS.
If only 1 LED lights red constantly,
the gas can is empty. Fit a new gas
can.
See section: 7.2 Gas level indicator.

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11

Fault Possible cause Remedy

The tool doesn’t fire. No gas can fitted or wrong type of

gas can fitted to the tool.

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New gas can fitted, but the tool
has not been pressed against the
working surface 3 times without
pulling the trigger.

Foreign object in the tool nosepiece
section.

The tool is too hot. Allow the tool to cool down.

When hot, the tool doesn’t fire
after a pause between use.

The tool doesn’t fire or fires
sporadically.

The fastener driving rate was
considerably higher than 1200 per
hour and the gas can is almost
empty.

Operation outside the limits of
permissible ambient conditions.

The temperature of the gas can is
outside the permissible range.

Gas bubbles have formed in the gas
injection system.

Open the gas can compartment
cover and check the contents.
If a gas can is present in the tool,
press the button marked GAS.
If 1 LED lights red constantly, the
wrong type of gas can has been
inserted in the tool. Insert the
correct type of gas can.
See section: 7.2 Gas level indicator.

Press the tool against the working
surface 3 times without pulling the
trigger.

Remove the magazine and
nosepiece and then remove the
foreign object from the tool.
See section: 7.3.1 Removing the
magazine 7
See section: 7.4.1 Removing the
nosepiece 9

Contact Hilti if the problem persists.
Remove the gas can and then refit

it. Then press the tool against the
working surface 3 times without
firing it.
Check the gas level indicator. If the
LED lights red constantly, the gas
can is empty. Fit a new gas can.
Allow the tool to cool down.
Observe the maximum fastener
driving rate (1200 per hour).
Contact Hilti if the problem persists.

Adjust the ambient conditions as
far as possible (e.g. use in a heated
room).
Use a different fastening technique.

Bring the gas can to a temperature
within the permissible range.
In very cold conditions (‐10°C),
allow the tool to warm up together
with the gas can (e.g. in the site
office).

Remove the gas can and then refit
it.

12

Fault Possible cause Remedy

The tool doesn’t fire or fires
sporadically.

Fastener cannot be removed
from nosepiece.

The tool is not lifted away completely
from the working surface.

A fastener is jammed in the tool
nosepiece.

Take care to ensure that the tool
is lifted away completely from the
working surface after driving each
fastener.

Remove the tool nosepiece from the
tool. Fit the tool nosepiece into the
support supplied and use the pin
punch to remove the fastener.

CAUTION

Do not damage the tool nosepiece.
See section: 7.4.1 Removing the
nosepiece 9
See section: 7.7 Removing a
jammed fastener 

10. Disposal

Most of the materials from which Hilti tools or appliances are manufactured can be recycled. The materials must
be correctly separated before they can be recycled. In many countries, Hilti has already made arrangements
for taking back old tools and appliances for recycling. Ask Hilti customer service or your Hilti representative
for further information. If you wish to bring the tool to a materials separation facility yourself: Regional and
international directives and regulations must be observed.

en

11. Manufacturer’s warranty ‐ tools

Hilti warrants that the tool supplied is free of defects
in material and workmanship. This warranty is valid
so long as the tool is operated and handled correctly,
cleaned and serviced properly and in accordance with
the Hilti Operating Instructions, and the technical
system is maintained. This means that only original
Hilti consumables, components and spare parts may
be used in the tool.

This warranty provides the free‐of‐charge repair or
replacement of defective parts only over the entire
lifespan of the tool. Parts requiring repair or replace­ment as a result of normal wear and tear are not
covered by this warranty.

Additionalclaims are excluded,unless stringent na­tional rules prohibit such exclusion. In particular,
Hilti is not obligated for direct, indirect, incidental

or consequential damages, losses or expenses in
connection with, or by reason of, the use of, or
inability to use the tool for any purpose. Implied
warranties of merchantability or fitness for a par­ticular purpose are specifically excluded.

For repair or replacement, send the tool or related
parts immediately upon discovery of the defect to
the address of the local Hilti marketing organization
provided.

This constitutes Hilti’s entire obligation with regard
to warranty and supersedes all prior or contempor­aneous comments and oral or written agreements
concerning warranties.

NOTE

Observe the gas can expiry date printed on the edge
of the can.

13

12. EC declaration of conformity

Designation:

Type:

en

Year of design:

We declare, on our sole responsibility, that this
product complies with the following directives
and standards: 75/324/EEC, 91/155/EEC, 64/
548/EEC, EN 292, EN 563, EN 50081‑2,
EN 1127‑1, EN 417, ISO 8662‑11:1999,
EN 792‑13:2001‑04, EN 60529:2000‑09, 64/
548/EEC, EN 55011:1998, A1:1999, CISPR 11:2003,
A1:2004, IEC 61000‑6‑2:2005, EN 61000‑6‑2:2001,
IS1:2005, IEC 61000‑6‑3:1996, EN 61000‑6‑3:2001,

Gas‐driven fastening

tool

GX 120

2007

IEC 61000‑4‑2:1995, IEC 61000‑4‑3:2006,
IEC 61000‑4‑8:1993: A1:2000.

Hilti Corporation

Norbert Wohlwend Howard Lang

Head of Quality & Processes Man­agement
BU Direct Fastening BU Direct Fastening
02 2007 02 2007

Senior Vice President

14