Hilti DX 351 User Manual
DX 351
Bedienungsanleitung de
Operating instructions en
Mode d’emploi fr
Istruzioni d’uso it
Manual de instruções pt
Manual de instrucciones es
Οδηγιες χρησεως el
Printed: 12.08.2013 | Doc-Nr: PUB / 5126242 / 000 / 01
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Contents Page
1. Safety precautions 17
2. General information 19
3. Technical description 19
4. Accessories, cartridges and fasteners 20
5. Technical data 21
6. Operation 22
7. Service (changing the piston and piston brake) 23
8. Care and maintenance 23
9. Assembly 24
10. Troubleshooting 25
11. Disposal 30
12. Manufacturer’s warranty – DX tools 30
13. EC declaration of conformity (original) 30
14. CIP approval mark 31
15. Health and safety of the user 31
Description of main parts
쐃 Magazine housing
쐇 Nail pusher
쐋 Fastener feed delay device
쐏 Piston brake (part of fastener guide)
쐄 Threaded sleeve
쐂 Fastener guide
쐆 Piston return spring
쐊 Black housing
쐎 Trigger
쐅 Handle
쐈 Cartridge feeding
쐉 Cartridge ejection
씈 Grip
씉 Aeration slots
씊 Power regulation indicator
씋 Power regulation wheel
씌 Nail detector assy
ORIGINAL OPERATING INSTRUCTIONS
DX 351 powder-actuated tool
Tool components Item no.
쐃 Fastener guide*
쐇 Piston brake (part of fastener guide)
쐋 Piston*
쐏 Piston return spring 331010
쐄 Piston guide 331203
쐂 Black housing 331027
쐆 Piston stopper right 331158
쐊 Piston stopper left 331045
* These parts may be replaced by the user/operator
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.
1. Safety precautions
1.1 Basic safety instructions
In addition to the safety precautions listed in the individual sections of these operating instructions, the
following points must be strictly observed at all times.
1.2 Only use Hilti cartridges or cartridges of equivalent quality
The use of cartridges of inferior quality in Hilti tools may
lead to build-up of unburned powder, which may explode and cause severe injuries to operators and bystanders. At a minimum, cartridges must either:
a) Be confirmed by their supplier to have been suc-
cessfully tested in accordance with EU standard EN
16264
NOTE:
● All Hilti cartridges for powder-actuated tools have
been tested successfully in accordance with EN 16264.
● The tests defined in the EN 16264 standard are system
tests carried out by the certification authority using
specific combinations of cartridges and tools.
The tool designation, the name of the certification authority and the system test number are printed on the
cartridge packaging.
or
b) Carry the CE conformity mark (mandatory in the EU
as of July 2013).
See packaging sample at:
www.hilti.com/dx-cartridges
1.3 Use as intended
The tool is designed for professional use in fastening
applications in construction where specially-designed
nails, threaded studs and composite fasteners are driven into concrete, steel and sand-lime block masonry.
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1.4 Improper use
● Manipulation or modification of the tool is not permissible.
● Do not operate the tool in an explosive or flammable
atmosphere, unless the tool is specially approved for
such use.
● Use only original Hilti fasteners, cartridges, accessories and spare parts or those of equivalent quality.
● Observe the information printed in the operating
instructions concerning operation, care and maintenance.
● Never point the tool at yourself or any bystander.
● Never press the muzzle of the tool against your hand
or other part of your body.
● Do not drive nails into excessively hard or brittle materials such as glass, marble, plastic, bronze, brass, copper, natural rock, insulation material, hollow brick, glazed
tile, thin-gauge sheet metal (< 4 mm), grey cast iron,
spheroidal cast iron and gas concrete.
1.5 Technology
● This tool is designed with the latest available technology.
● The tool and its ancillary equipment may present hazards when used incorrectly by untrained personnel or
not as directed.
1.6 Making the workplace safe
● Ensure that the workplace is well lit.
● Operate the tool only in well-ventilated working areas.
● The tool is for hand-held use only.
● Avoid unfavorable body positions. Work from a secure
stance and stay in balance at all times
● Keep other persons, children in particular, outside the
working area.
● Before using the tool, make sure that no one
is standing behind or below the point where fasteners
are to be driven.
● Keep the grip dry, clean and free from oil and grease.
1.7 General safety precautions
● Operate the tool only as directed and only when it is
in faultless condition.
● If a cartridge misfires or fails to ignite, proceed as follows:
1. Keep the tool pressed against the working surface for
30 seconds.
2. If the cartridge still fails to fire, withdraw the tool from
the working surface, taking care that it is not pointed
towards your body or bystanders.
3. Manually advance the cartridge strip one cartridge.
Use up the remaining cartridges on the strip. Remove
the used cartridge strip and dispose of it in such a
way that it can be neither reused nor misused.
● Never attempt to pry a cartridge from the magazine
strip or the tool.
● Keep the arms flexed when the tool is fired (do not
straighten the arms).
● Never leave the loaded tool unattended.
● Always unload the tool before beginning cleaning,
servicing or changing parts and before storage.
● Unused cartridges and tools not presently in use must
be stored in a place where they are not exposed to humidity or excessive heat. The tool should be transported
and stored in a toolbox that can be locked or secured to
prevent use by unauthorized persons.
1.8 Temperature
● Do not disassemble the tool while it is hot.
● Never exceed the recommended maximum fastener
driving rate (number of fastenings per hour). The tool
may otherwise overheat.
● Should the plastic cartridge strip begin to melt, stop
using the tool immediately and allow it to cool down.
1.9 Requirements to be met by users
● The tool is intended for professional use.
● The tool may be operated, serviced and repaired only
by authorised, trained personnel. This personnel must
be informed of any special hazards that may be encountered.
● Proceed carefully and do not use the tool if your full
attention is not on the job.
● Stop working with the tool if you feel any pain or dis-
comfort.
1.10 Personal protective equipment
● The operator and other persons in the immediate vicin-
ity must always wear approved eye protection, a hard
hat and suitable ear protection.
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3. Technical description
The tool is designed for professional use in fastening
applications where specially-designed nails, threaded
studs and compo site fasteners are driven into concrete,
steel and sand-lime block masonry.
The tool works on the well-proven piston principle and
is therefore not related to high-velocity tools. The piston principle provides an optimum of working and fastening safety. The tool works with cartridges of 6.8/11
caliber.
Piston return and cartridge transport is fully automatic.
This permits fastenings to be made very quickly and
economically with nails and threaded studs. The use of
a nail magazine (MX27 or MX32) greatly increases the
speed and convenience of fastening with the tool, above
all when making large numbers of identical fastenings
of all kinds.
As with all powder-actuated tools, the tool, magazine,
fastener program and cartridge program form a “technical unit”. This means that optimal fastening with this
system can only be achieved if the fasteners and cartridges are specially manufactured for it, or products of
equivalent quality, are used. The fastening and application recommendations given by Hilti are only applicable
if these conditions are observed.
The tool features 5-way safety – for the safety of the
operator and bystanders.
The piston principle
The energy from the propellant charge is transferred to
a piston, the accelerated mass of which drives the fastener
into the base material. As approximately 95 % of the
kinetic energy is absorbed by the piston, the fastener is
driven into the base material at much reduced velocity
(less than 100 m/sec.) in a controlled manner. The driving process ends when the piston reaches the end of
its travel. This makes dangerous through-shots virtually impossible when the tool is used correctly.
The drop-firing safety device is the result of coupling the firing mechanism with the cocking movement. This is designed to prevent the Hilti DX tool from
firing when it is dropped onto a hard surface, no matter at which angle the impact occurs.
The trigger safety device ensures that the cartridge
cannot be fired simply by pulling the trigger only. The
tool can be fired only when fully depressed.
The contact pressure safety device requires the tool
to be fully depressed with a significant force. The tool
can be fired only when pressed fully in this way.
In addition, all Hilti DX tools are equipped with an unintentional firing safety device . This prevents the tool
from firing if the trigger is pulled and the tool then pressed
against the work surface. The tool can be fired only when
it is first pressed 쩸 correctly and 쩹 the trigger then
pulled.
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2. General information
2.1 Signal words and their meaning
WARNING: The word WARNING is used to draw atten-
tion to a potentially dangerous situation which could
lead to severe personal injury or death.
CAUTION: The word CAUTION is used to draw attention
to a potentially dangerous situation which could lead to
minor personal injury or damage to the equipment or
other property.
2.2 Pictograms
Warning signs
General
warning
Warning:
hot surface
Obligation signs
Wear eye
protection
Wear a
safety helmet
Wear ear
protection
Symbols
Read the opera-
tion instructions
before use
The numbers refer to the illustrations. The illustrations can be found on the fold-out cover pages. Keep
these pages open while you read the operating instructions.
In these operating instructions, the designation “the
tool” always refers to the DX 351 powder-actuated tool.
Location of identification data on the tool
The type designation and the serial number are printed
on the type plate on the tool. Make a note of this information in your operating instructions and always refer
to it when making an enquiry to your Hilti representative or service department.
Type: DX351 Serial no.:
Printed: 12.08.2013 | Doc-Nr: PUB / 5126242 / 000 / 01
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