HILTI DX 450 Powder Actuated Nail Gun Instruction Manual

HILTI DX 450 Powder Actuated Nail Gun

Information about the documentation

About this 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.

Explanation of symbols used
Warnings
Warnings alert persons to hazards that occur when handling or using the product. The following signal words are used:

DANGER

• Draws attention to imminent danger that will lead to serious personal injury or fatality.

WARNING

• Draws attention to a potential threat of danger that can lead to serious injury or fatality.

CAUTION

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

Symbols in the documentation
The following symbols are used in this document:

| Read the operating instructions before use.
---|---
| Instructions for use and other useful information
| Dealing with recyclable materials
| Do not dispose of electric equipment and batteries as household waste

Symbols in the illustrations
The following symbols are used in illustrations:

| These numbers refer to the corresponding illustrations found at the beginning of these operating instructions
---|---
| The numbering reflects the sequence of operations shown in the illustrations and may deviate from the steps described in the text
| Item reference numbers are used in the overview illustrations and refer to the numbers used in the product overview section
| This symbol is intended to draw special attention to certain points when handling the product.

Product information

products are designed for professional users and only trained, authorized personnel are permitted to operate, service and maintain the products. This personnel must be specifically informed about the possible hazards. The product and its ancillary equipment can present hazards if used incorrectly by untrained personnel or if used not in accordance with the intended use.
The type designation and serial number are printed on the rating 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 inquire about the product.

Product information

Declaration of conformity

The manufacturer declares, on his sole responsibility, that the product described here complies with the applicable legislation and standards. A copy of the declaration of conformity can be found at the end of this documentation.
The technical documentation is filed here:
Hilti Entwicklungsgesellschaft mbH | Tool Certification | Hiltistrasse 6 | D-86916 Kaufering, Germany

Safety

Safety instructions

Basic safety precautions
WARNING! Read all safety instructions and other instructions. Failure to comply with the safety instructions and instructions can cause serious injuries.
Keep all safety instructions and instructions for future reference.

• Do not tamper with or modify the fastening tool in any way.

•  Use only fastening tools and items of equipment that are compatible with each other (base plates, fastener guides, magazines, pistons and fasteners) and consumables (fasteners and cartridges).

• Check the fastening tool and accessories for damage.

• Moving parts must be in full working order; make sure that they cannot jam. Comply with the instructions on cleaning and oiling in these operating instructions → page 29.

• All parts must be correctly installed to ensure faultless operation of the fastening tool. Damaged parts must be properly repaired or replaced by Hilti Service unless otherwise stated in the operating instructions.

• Use only Hilti DX cartridges, or other suitable cartridges that meet the minimum safety requirements.
  → page 22

• Use the fastening tool only for the applications defined in the section headed “Intended use” → page 21. Do not attempt to drive fasteners into unsuitable base materials, for example material that is too thin, too hard, or too brittle. Driving a fastener into these materials can cause the fastener to break, splinter the material or be driven right through. Examples of unsuitable materials are:

• Weld seams in steel, cast iron, glass, marble, plastic, bronze, brass, copper, insulating material, hollow brick, ceramic brick, thin sheet metal (< 4 mm) and cellular concrete.

• Comply with the Hilti ‘Direct Fastening Technology Manual’ or the corresponding regional Hilti ‘Technical Guide to Fastening Technology’. Always also comply with the operating instructions of the fastener to be used.

Requirements to be met by users

• Only appropriately trained persons who have been duly authorized and informed of the possible hazards are allowed to operate or service this fastening tool.
• Wear your personal protective equipment while the tool is in use.
•  Wear suitable eye protection and a hard hat.
•  Wear protective gloves. The fastening tool can get hot in use.
•  Wear ear protectors. The ignition of a propellant charge can damage the hearing.
• Wear non-skid shoes.

Requirements to be met by the workplace

• Keep the workplace tidy. Objects which could cause injury should be removed from the working area. Disorder in the working zone can lead to accidents.
• Make sure that the working area is well lit and, when working in an enclosed space, make sure it is adequately ventilated.

Personal safety

• Never press the nosepiece of the fastening tool against your hand or any other part of the body! Never point the fastening tool toward other persons! → page 25
• Do not compress the fastening tool with your hand on the magazine or fastener guide, piston or piston guide or a loaded fastener. Compressing the fastening tool by hand can make the fastening tool ready to fire, even without a fastener guide installed. This gives rise to a risk of serious injury for yourself and others.
• Everyone in the vicinity must wear ear protection, eye protection and a hard hat.
•  Stay alert, watch what you are doing and use common sense when operating a direct fastening tool. Do not use the fastening tool when you are tired or under the influence of drugs, alcohol or medication. Stop working if you experience pain or feel unwell. A moment of inattention while operating the fastening tool can result in serious injury.
• Avoid working in awkward body positions. Make sure you work from a safe stance and stay in balance at all times.
• Keep the arms slightly bent while operating the fastening tool, do not straighten the arms.
• Keep other people away from the working area, especially children.

Use and care of direct fastening tools

•  Use the fastening tool only for its intended use and only when it is in faultless condition. Do not attempt to use the tool for purposes for which it is not intended.
• Do not use the fastening tool in places where there is a risk of fire and explosion.
•  Before driving fasteners, check behind the object to make sure that no-one is present in line with the fasteners to be driven. Danger of fasteners penetrating right through!
•  Make sure that the nosepiece of the fastening tool is never pointed toward yourself or other persons.
•  Hold the fastening tool only by the gripping surfaces provided for the purpose.
•  Keep the gripping surfaces dry, clean and free from oil and grease.
•  Pull the trigger only when the fastening tool is at right angles to and pressed fully against the work surface.
• Before starting work, check the selected energy setting.
• Carry out a test by driving fasteners into the base material you are working on → page 24.
•  When driving fasteners, always hold the fastening tool at right angles to the work surface. This reduces the risk of a fastener being deflected by the base material.
• Do not drive fasteners into existing holes unless this is recommended by Hilti (e.g. DX-Kwik).
• Do not re-use a fastener that was used beforehand – risk of injury! Use a new fastener.
• Do not attempt to re-drive a fastener that was not driven in deeply enough! The fastener could break.
• Never leave a loaded fastening tool unattended.
• Always unload the fastening tool (remove cartridges and fasteners) before cleaning, maintenance and care, changing the fastener guide, before work breaks and before storing the tool.
• Transport and store the fastening tool in the Hilti case intended for the purpose.
• Store fastening tools that are not in use in a dry, secure place where they are inaccessible to children.
•  Always position the nosepiece of the fastening tool on smooth, flat surfaces free of obstructions and fully supported by the sub-structure.
• Comply with the specifications for distances from edges and distances between fasteners (see the section headed Minimum distances).

Thermal safety rules

• Do not exceed the maximum fastener driving rate recommended in the section headed “Technical data”.
• If the fastening tool overheats or if the cartridge strip deforms or melts, remove the cartridge strip and allow the fastening tool to cool down.
• Do not dismantle the fastening tool while it is hot. Allow the fastening tool to cool down.

Risk of explosion with cartridges

•  Use only cartridges that are suitable and approved for use with the fastening tool.
•  Remove the cartridge strip when you are going to take a break and when you have finished the job, and before you transport the fastening tool.
• Do not use force to remove fasteners and/or cartridges from the magazine strip or the fastening tool.
•  Store unused cartridges in accordance with the storage specifications for PAT cartridges (e.g. dry, temperature between 5 °C and 25 °C) in a locked storage facility. Follow the instructions for storage in the safety data sheet of the cartridges.
•  Do not leave unused or partly used cartridge strips lying around. Collect the used cartridge strips and store the cartridge strips at a suitable location. Comply with the instructions in the operating instructions for the cartridges.

Description

Product overview 1

1. Adjusting knob for driving energy
2. Driving-energy setting indicator
3. Cartridge barrel (ejection)
4. Loading lever
5.  Cycling lever
6. Loading chamber (fasteners)
7.  Nosepiece
8. Base plate
9. Cartridge barrel (insertion)
10. Grip
11. Trigger

 Product overview 2

1. Base plate
2. Cycling lever
3. Fastener guide
4.  Stop ring
5. Housing
6. Piston guide
7. Piston

Intended use

The product described is a fastening tool for driving hardened fasteners into steel base material.

DX 450-FA
Area of application:

• Corrosion-resistant fastening of glass-facade attachment profiles to steel supporting structures (e.g. glass facades, conservatories, marquees, stairwells).

DX 450-USS
Area of application:

• Exclusively for fastening rails to steel. The fastener must be set inside the rail.

Use the product only in combination with the equipment designed for use with the fastening tool. Base plates, fastener guides, pistons and fasteners must be compatible with one another.
Use the product only with spare parts and accessories from Hilti and with cartridges and fasteners from Hilti, or other suitable cartridges and fasteners.

 Requirements to be met by cartridges

WARNING
Risk of injury by unexpected explosion! Use of cartridges that do not meet the minimum safety requirements can lead to a build-up of unburned powder. A sudden explosion and severe injuries to the operator and bystanders can result.

• Use only cartridges that meet the minimum safety requirements of your local statutory regulations!
• Adhere to the maintenance intervals as stated and have the fastening tool cleaned regularly by Hilti-Service!

Use only the Hilti DX cartridges listed in this table, or other suitable cartridges that are compliant with the minimum safety requirements:

• It is a requirement for EU and EFTA countries that the cartridges must be CE-compliant and must bear the CE mark of compliance.
• It is a requirement for the United Kingdom that the cartridges must be UKCA-compliant and must bear the UKCA mark of compliance.
•  It is a requirement for the USA that the cartridges must be compliant with the stipulations set out in ANSI A10.3-2020.
•  It is a requirement for the non-European member states of the C.I.P. that the cartridges must have C.I.P. approval for the DX fastening tool used.
•  It is a requirement for the remaining countries that the cartridges must have passed the firing-residues test in accordance with EN 16264 and must have a manufacturer’s declaration to this effect.

Cartridges
Comply with the instructions for use in the operating instructions of the fastener used, in the Hilti Direct Fastening Technology Manual or the corresponding local Hilti ‘Technical Guide to Fastening Technology’.

 Items supplied

Fastening tool, base plate, cleaning set, safety data sheet (cartridges), quick guide, operating instructions Other system products approved for use with this product can be found at your local Hilti Store or at: www.hilti.group

Minimum distances and spacing

You must always observe certain minimum distances and spacing when driving fasteners. They can differ, depending on the product.
For detailed information, request a copy of the Hilti ‘Direct Fastening Technology Manual’ or the corresponding local Hilti ‘Technical Guide to Fastening Technology’ from your Hilti Store.

Technical specifications and data:

| Fastening accessories
---|---
to steel
Min. edge distance (base-material edge to fastener)| ≥ 10 mm

(≥ 0.4 in)

Min. distance (between fasteners)| ≥ 20 mm

(≥ 0.8 in)

Min. base material thickness| 4 mm

(0.2 in)

Follow the instructions in the operating instructions of the fastener!

Technical data

| DX 450-FA| DX 450-USS
---|---|---
Weight (fastening tool)| 3.1 kg

(6.8 lb)

| 3.16 kg

(6.97 lb)

Dimensions| 355 mm × 55 mm × 178 mm

(14.0 in × 2.2 in × 7.0 in)

| 355 mm × 55 mm × 178 mm

(14.0 in × 2.2 in × 7.0 in)

Length (fastener)| 14 mm

(0.6 in)

| 14 mm

(0.6 in)

Recommended maximum fasten- ing rate| 450 fastener driving opera- tions/h| 450 fastener driving opera- tions/h
Max. contact pressure| 100 N … 125 N

(22 lbf … 28 lbf)

| 100 N … 125 N

(22 lbf … 28 lbf)

Compression stroke| 17 mm

(0.7 in)

| 17 mm

(0.7 in)

Ambient temperature (storage and use)| −15 ℃ … 50 ℃

(5 ℉ … 122 ℉)

| −15 ℃ … 50 ℃

(5 ℉ … 122 ℉)

Noise and vibration information

The sound pressure and vibration values given in these instructions have been measured in accordance with a standardized test and can be used to compare fastening tools with each other. They can also be used for a preliminary assessment of exposure. The data given represent the main applications of the fastening tool. However, if the fastening tool is used for different applications, with different accessories or is poorly maintained, the data may vary. This can significantly increase exposure over the total working period. An estimation of the level of exposure should also take into account the periods of time when the fastening tool is not actually in use. This can significantly reduce exposure over the total working period. Prescribe additional safety measures to protect the operator from the effects of noise and/or vibration, such as: Maintenance of the fastening tool and its additional equipment or accessories, keeping the operator’s hands warm, organization of work procedures.
The noise values listed were determined under the following conditions:
Noise information conditions

Noise information in accordance with EN 15895

Vibration information in accordance with EN 2006/42/EG

Preparations at the workplace

WARNING
Risk of injury by accidental triggering! A loaded fastening tool can be made ready to fire at any time. Accidental triggering can endanger you and others.

• Always unload the fastening tool (cartridges and fasteners) whenever you interrupt work with the fastening tool.
• Before all maintenance, cleaning and setup activities, always make sure that there are no cartridges and no fasteners in the fastening tool.
• Before you start driving fasteners, always check that you are using the correct combination of base plate, fastener guide, piston, fasteners and cartridge.
• Before commencing work, check that all safety devices are fitted and that they are functioning correctly. In order to ensure faultless operation of the fastening tool, all parts must be fitted correctly and must meet the necessary requirements.

You can find a Hilti product training for stud fastening tools online by following this link or scanning the QR code.

(Training available in English only)

Assembling the fastening tool 2

1. Insert the piston guide into the housing (1).
   •  The cut-out in the piston guide faces up when the guide is being inserted.
2. Insert the piston into the piston guide (2).
3. Position the stop ring on the fastener guide (3) and secure the stop ring with the friction ring (4).
4.  Slip the fastener guide into the base plate (5).
5. Set the base plate on the base-plate mount.
   •  The cut-out in the base plate fits on to the projection on the housing.
6.  Screw the base plate on as far as it will go (6) and then back off the base plate until the base plate engages.
7. Flip the cycling lever back to its initial position (7).
   •  The advancer lever automatically engages in the tensioning lever (8).

Setting driving energy

Select the energy setting that suits the application. If no empirical values are available, always start with the minimum driving energy.

1. To increase power, turn the adjusting knob for driving energy in the + direction.
   Energy levels:

   • 1 = lowest energy
   •  3 = highest energy

2. To reduce power, turn the adjusting knob for driving energy in the − direction.

3. Check whether the fastener was correctly driven in accordance with the operating instructions of the fastener.

Operation

WARNING
Hazard due to hot surfaces! The fastening tool can become hot in use.

• Wear protective gloves.

If resistance is unusually high when you insert the cartridge strip, check whether the cartridge strip is compatible with this fastening tool.
Observe the safety instructions and warnings in this documentation and on the product.
Safety-related instructions for use

body!

Pressing the nosepiece against a part of the body (a hand, for example) can make the fastening tool ready to fire. As a result, there would be the risk of a fastener being fired into a part of the body.

| Do not pull or knock fastener guides back by hand!

Pulling fastener guides back by hand can make the fastening tool ready to fire. As a result, there would be the risk of a fastener being fired into a part of the body.

Loading fastening tool 4

Important: Always load the fastener into the fastening tool first and then load the cartridge strip. An incorrect loading sequence will result in the first cartridge being skipped and left unfired.
When loading, hold the fastening tool laid flat on its side (lettering facing up). This will keep the nail from falling out during the loading procedure.

1. Insert the fastener, tip first, into the loading chamber of the cycling lever.
2. Pull to release the cycling lever from its retainer and flip the cycling lever forward through 180°.
3.  Slide the loading lever all the way toward the fastening tool.
   •  This positions the fastener correctly in the fastener guide.
4. Slide the loading lever back to its initial position.
5.  Flip the cycling lever back to its initial position until it engages in the retainer.
6.  Push the cartridge strip, narrow end first, into the cartridge barrel (insert) until the full length of the cartridge strip is inside the grip.
7. Set the driving energy. → page 24
   •  The fastening tool is loaded and ready for use.

Driving fasteners

DX 450-FA

1. Load the fastening tool. → page 25
2. Hold the fastening tool perpendicular to the working surface and then press it at right angles against the surface.
3. Press the trigger to drive the fastener.
4. Repeat the loading and driving operation.

Driving fasteners

DX 450-USS
For this application, it is imperative to set the fasteners inside the rails.

1. Load the fastening tool. → page 25
2. Hold the fastening tool perpendicular to the working surface and then press it at right angles against the surface.
3. Press the trigger to drive the fastener.
   •  Check the driving depth and, if necessary, adjust the driving energy.
4. Repeat the loading and driving operation.
   After 100 fastener-driving operations, check the piston for damage. Replace a damaged piston.

 Unloading fastening tool

1. Pull the cartridge strip out of the fastening tool.
2. Check that there is no fastener in the fastener guide.

Safe procedures in the vent of jamming or cartridge misfires

WARNING
Risk of explosion! Cartridges may fire (explode) if handled improperly.

• Do not use force to remove cartridges from the fastening tool or the magazine strip.

Fastening tool jams and does not extend

Risk of injury by unsecured fastening tool! If it jams in the compressed state, the fastening tool might be loaded with the safety off. Unintentional triggering can cause severe injuries.

• At all times, make sure that the fastening tool is not pointing toward you or anyone else.

1. Lift the fastening tool away from the working surface.
2. Immediately pull the cartridge strip out of the fastening tool.
   • WARNING! If the cartridge strip cannot be removed:
   • Allow the fastening tool to cool down at a safe location under observation.
   •  At all times, make sure that the fastening tool is not pointing toward you or anyone else.
   •  Contact Hilti Service.
3. Service the tool. → page 28

Cartridge does not fire when fastening tool is hot (above design-base

maximum operating  temperature)

1. Keep the fastening tool pressed against the work surface for at least 10 seconds and trigger the fastening tool again.
2. If the cartridge still does not fire, lift the fastening tool away from the work surface.
3. Immediately pull the cartridge strip out of the fastening tool.
   • WARNING! If the cartridge strip cannot be removed:
   • Allow the fastening tool to cool down at a safe location under observation.
   • At all times, make sure that the fastening tool is not pointing toward you or anyone else.
   •  Contact Hilti Service.
4.  Move the cartridge strip to a secure location.
5.  Allow the fastening tool to cool down.
6. Service the tool. → page 28
7.  Dispose of the cartridges that have not fired.
   • Comply with the locally applicable disposal regulations.
8. Resume work with a new cartridge strip.

The cartridge does not fire when the fastening tool is at operating

temperature

1. Stop using the tool immediately.
2. Unload the fastening tool. → page 26
   • WARNING! If the cartridge strip cannot be removed:
   • Allow the fastening tool to cool down at a safe location under observation.
   •  At all times, make sure that the fastening tool is not pointing toward you or anyone else.
   •  Contact Hilti Service.
3. Check that you are using the correct combination of base plate, fastener guides, piston, fasteners and cartridge.
4. Check the stop ring, piston, base plate and fastener guide for wear; replace the components as necessary.
5. Clean and oil the fastening tool. → page 29
   •  If the problem persists after the measures described above have been taken, further use of the fastening tool is not permissible.
   • Send the fastening tool to Hilti Service.

Dirt and residues build up in the tool under normal operating conditions and functional parts are also subject to wear.
Service the tool at regular intervals (daily, at the latest every 2500 to 3000 fastener-driving operations). If the fastening tool is used intensively, check piston and stop ring daily for wear and damage.
When 30,000 fasteners have been driven, have the tool fully serviced by Hilti Service.

Care and maintenance

Care of the fastening tool

For cleaning, use only the cleaning accessories supplied by Hilti, or material of equivalent quality. Do not, under any circumstances, use spray cleaning equipment, compressed air, high-pressure cleaning equipment, solvents or water for cleaning.

CAUTION
Risk of damage to the fastening tool! Foreign bodies can jam in the fastening tool and damage the fastening tool when a cartridge is fired.

• Prevent foreign bodies from penetrating into the interior of the fastening tool.
• Clean the exterior of the fastening tool with a slightly damp cloth at regular intervals.

Maintenance

WARNING
Dangerous substances The deposits inside DX tools contain substances that may present a health hazard.

• Do not inhale dust or dirt while cleaning.
• Keep dust and dirt away from foodstuffs.
•  Wash your hands after cleaning the fastening tool.
•  Clean the fastening tool and use Hilti spray as stated in the operating instructions. This will help prevent malfunctions.

1. Regularly check all external parts of the fastening tool for damage.
2. Regularly check all operating controls to ensure that they work properly.
3.  Use the fastening tool only with suitable cartridges and the recommended energy setting → page 22.
   •  Use of the wrong cartridges or excessively high power settings can lead to premature failure of the fastening tool.

 Servicing the tool

Service the tool in the following situations:

1. If energy fluctuations occur (evidenced by irregularities in fastener penetration depth).
2.  If cartridge misfires occur (the cartridge is not fired).
3.  If the tool becomes noticeably less easy to operate.
   •  If the required contact pressure increases noticeably.
   •  If the trigger resistance increases.
   •  If the adjusting knob for driving energy has become difficult to turn.
   • If the cartridge strip is difficult to remove.

Disassembling the fastening tool 3
WARNING
Risk of injury by accidental triggering! A loaded fastening tool can be made ready to fire at any time. Accidental triggering can endanger you and others.

• Always unload the fastening tool (cartridges and fasteners) whenever you interrupt work with the fastening tool.
• Before all maintenance, cleaning and setup activities, always make sure that there are no cartridges and no fasteners in the fastening tool.

1. Flip the cycling lever forward (1).

2. Pull the rail in the device body forward (2) and unhook the advance lever.

3. Unscrew the base plate (3) and remove the base plate (4).

4. Pull the fastener guide out of the base plate (5).
   Check the stop ring for damage. If the stop ring is damaged, disengage the friction ring (6) and remove the stop ring (7).

5. Allow the piston guide to slide out of the housing (8).

6. Use the rod supplied to push the piston out of the piston guide (9).

Checking piston and stop ring
WARNING
Risk of injury! A faulty stop ring or piston or a faulty base plate leads to an increased risk of malfunctions.

• Check the stop ring and piston for wear and replace them if damaged.
•  Do not tamper with or modify the piston.
•  Do not attempt to repair a faulty piston yourself, for example by grinding the tip.

1. The piston must be replaced in the following cases:
   •  The piston is broken.
   •  The piston is badly worn or chipped (e.g. a segment of more than 90° of the circumferential ring-shaped elevation at the piston tip broken away)
   • The piston is bent (check by rolling the piston on a smooth, flat surface).
2. The stop ring must be replaced in the following cases:
   • The stop ring is clearly deformed, broken or detached.
   • The snap ring is broken, detached or missing.
   •  The stop ring no longer holds on the fastener guide.

Never use a worn or damaged piston and do not tamper with or modify the piston.
Comply with the information on wear criteria applicable to important tool components in these operating instructions → page 29.

Criteria for replacement of wear parts
Piston and stop ring wear criteria

Worn

Always replace the

| | Signs of chipping at the tip / face of the piston.
piston and stop ring|
together.|
| | The piston has worn an impres-
| sion into the stop ring, the stop
| ring is deformed.

Cleaning and oiling fastening tool 5
Use only Hilti spray. The use of other lubricants can cause malfunctions or damage the fastening tool. Apply the Hilti spray only as a thin film. It is not permissible for beads to form. For example, after applying the Hilti spray, rub the oiled surface down lightly with the cloth supplied with the spray. Make sure that no oil makes its way into the cartridge chamber!

1. Use the flat brush to clean piston (1).
2. Use the thick round brush to clean the piston guide (inside) (2).
3. Use the thin round brush to clean cartridge chamber (3).
4. Use the flat brush to clean the piston guide (outside) (4).
   •  Oil the piston guide (outside) with Hilti spray.
5. Use the flat brush to clean the base plate (inside) (5) and use the thick round to clean the thread (outside)(6).
6. Use the thin round brush to clean the through-bore for the piston (7).
7.  Use the flat brush to clean the fastener guide (outside) (8).
   •  Oil the fastener guide (outside) with Hilti spray.
8.  Use the thick round brush to clean internal thread (9) of the base-plate mount.
   •  Oil the internal thread of the base-plate mount with Hilti spray.

Replacing jammed stop ring
If piston guide and piston jam on disassembly, the deformed stop ring might have become jammed on the piston.

1. Disassemble the fastening tool to the point at which you can remove the piston guide.
2. Insert the rod through the cartridge chamber and use the rod to push the piston out of the piston guide.
3. Remove the friction ring and pull the stop ring off the piston.
4. Replace the stop ring and the stop ring.

Final check of the fastening tool

• After carrying out care and maintenance, check that all protective and safety devices are fitted and that they function faultlessly.

Troubleshooting

WARNING! Risk of injury! Before you start troubleshooting, make sure there are no cartridges in the fastening tool. If the cartridges cannot be removed, contact Hilti Service
If the trouble you are experiencing is not listed in this table or you are unable to rectify the problem by yourself, please contact Hilti Service.

fastening tool.

→ page 26

▶ Remove the cartridge strip and insert a new strip.
Fastening tool is damaged.| ▶  Contact Hilti Service.
Cartridge strip cannot be removed| The fastener driving rate is too high.| ▶| Allow the fastening tool to cool and then carefully try to remove the cartridge strip. Remove the piston guide from the fastening tool. If the cartridge sleeve

is jammed in the cartridge chamber, use the round rod to remove it. If the cartridge sleeve remains jammed, contact Hilti Service. Do not attempt to forcibly remove cartridges from the magazine strip.

Fastening tool dirty.| ▶| Clean and oil the fastening tool.

→ page 29

The cartridge doesn’t fire

| Bad cartridge (does not fire or achieves slight or no impact).| ▶| Pull the cartridge strip through to the next cartridge.
Fastening tool dirty.| ▶| Clean and oil the fastening tool.

→ page 29

The cartridge doesn’t fire

| Not fully pressed against the work surface.| ▶| Press the fastening tool fully against the work surface and then pull the trigger.
Firing pin damaged.| ▶| Contact Hilti Service.

Insufficient nail stand-off

| Driving energy too high.| ▶| Select the appropriate cartridge power level for the application

→ page 22.

Wrong piston inserted.| ▶| Use the correct equipment configuration with compatible piston and fastener.
The piston is worn.| ▶| Replace the piston, stop ring and friction ring.

Insufficient driving depth

| Space between metal sheet and profile.| ▶| Avoid gaps between profile and beam, or secure the beam on the correct side.

Excessive nail stand-off

| Fastener driven into the rib of the beam (possibly with shear break- age).| ▶| Check the piston; replace the piston if necessary. Also check for residues.
Supporting material is too thick, or the thickness has changed.| ▶| Select the appropriate cartridge power level for the application.

→ page 22

Fastener driving power is too low.| ▶| Select the appropriate cartridge power level for the application.

→ page 22

▶| Increase driving energy in accordance with cartridge recommendations or use a more powerful cartridge.
Excessive build-up of foreign mat- ter on the fastening tool.| ▶| Clean the fastening tool.

→ page 29

The piston is worn.| ▶| Replace the piston, stop ring and friction ring.
Fastening tool is damaged.| ▶| Contact Hilti Service.
Wrong piston inserted.| ▶| Use the correct equipment configuration with compatible piston and fastener.
Nail stand-off varies consid- erably| The fastening tool was rammed hard against the working surface.| ▶| Avoid ramming the fastening tool against the work surface.
Irregular, partly incomplete cycling.| ▶| Cycle the tool completely.
Irregular driving energy.| ▶

▶

| Service the tool.

Contact Hilti service.

Shear breakages| The face of the piston is worn or chipped (see the section headed “Criteria for replacement of wear parts”).| ▶| Replace the piston, stop ring and friction ring. → page 29
Fastener driven into the rib of the beam (possibly with shear break- age).| ▶| Check the piston; replace the piston if necessary. Also check for residues.
Malfunction| Possible cause| Action to be taken
---|---|---
Shear breakages| Fastener driven at unsuitable posi- tion (where base material too thick, at edge or curved profiles).| ▶| Check the fastener recommen- dation. If the type of fastener is correct, increase driving energy in accordance with cartridge recommendations or use a more powerful cartridge.
Fastening tool does not ex- tend| Piston jams in piston brake.| ▶| Disassemble the fastening tool.

→ page 28

▶| Replace the piston, stop ring and friction ring.
Cartridge strip jams, fastening tool is overheated.| ▶

▶

| See the “Cartridge strip cannot be removed” fault. Adhere to the maximum fastener driving rate.

Use only recommended car- tridges → page 22.

Firing not possible| Fastening tool was not cycled cor- rectly, the cycling grip is not in the initial position.| ▶| Cycle the fastening tool com- pletely and set the cycling grip to the starting position.
The trigger is pulled before the tool is pressed fully against the working surface.| ▶| Press the fastening tool fully against the work surface and then pull the trigger.
Fastener transport malfunctions.| ▶

▶

▶

| Remove the fastener strip. Check the fastener strip for damage.

Replace damaged fastener strips.

Fastening tool is damaged.| ▶| Contact Hilti Service.
No fastener driven| Fastening tool was not cycled cor- rectly, the cycling grip is not in the initial position.| ▶| Cycle the fastening tool com- pletely and set the cycling grip to the starting position.
No fastener loaded.| ▶| Load a fastener into the fastening tool.
No piston installed in the fastening tool.| ▶| Install the piston in the fastening tool.
The piston is broken.| ▶| Change the piston and stop ring.
Piston does not return.| ▶| Contact Hilti Service.
The fastener guide needs to be cleaned.| ▶| Service the tool.
Fasteners are jammed in the fas- tener guide.| ▶

▶

| Remove jammed fasteners. Avoid shear breakages and misfires.
Fastener guide cannot be fully installed.| The fastener guide needs to be cleaned.| ▶| Service the tool.
Piston cannot be installed.| Fastening tool, especially the pis- ton guide, is dirty.| ▶| Service the tool.

Problems with the cartridges

machines or appliances can be returned to Hilti for recycling. Ask Hilti Service or your Hilti representative for further information.

The cartridge strip doesn’t advance

| The cartridge strip is damaged.| ▶| Change the cartridge strip.
Excessive build-up of foreign mat- ter on the fastening tool.| ▶

▶

| Clean the fastening tool.

If necessary, have the fastening tool checked by Hilti Service.

Fastening tool damaged.| ▶| Contact Hilti Service.
Wrong cartridge strip used.| ▶| Use only cartridge strips of a type intended for use with the fastening tool.

Cartridge strip is difficult to remove.

| Fastening tool overheated.| ▶

▶

| Allow the fastening tool to cool down under constant observation.

Subsequently, carefully remove the cartridge strip from the fastening tool.

Build-up of combustion residues.| ▶

▶

▶

| Service the tool.

Clean the cartridge chamber. Insert new cartridge strip.

The cartridge doesn’t fire

| Bad cartridge (does not fire or achieves slight or no impact).| ▶| Pull the cartridge strip through to the next cartridge.
Fastening tool dirty.| ▶| Clean and oil the fastening tool.

→ page 29

Not fully pressed against the work surface.| ▶| Press the fastening tool fully against the work surface and then pull the trigger.
Firing pin damaged.| ▶| Contact Hilti Service.

The cartridge strip melts

| Fastening tool was pressed against the working surface for too long.| ▶

▶

| Remove cartridge strip and insert a new cartridge strip instead.

Fire the fastening tool sooner after pressing it against the working surface.

Fastener driving rate too high (fas- tening tool overheated).| ▶

▶

▶

| Stop using the tool immediately. Remove cartridge strips and allow the fastening tool to cool down.

Do not exceed the recom- mended maximum fastener driving rate (see the section headed “Technical data”).

A cartridge detaches itself from the cartridge strip

| Fastener driving rate too high (fas- tening tool overheated).| ▶

▶

▶

| Stop using the tool immediately. Remove cartridge strips and allow the fastening tool to cool down.

Do not exceed the recom- mended maximum fastener driving rate (see the section headed “Technical data”).

Cartridge strip stored incorrectly/stored for too long.| ▶| Use a new cartridge strip.

Manufacturer’s warranty

• Please contact your local Hilti representative if you have questions about the warranty conditions.

C.I.P. test confirmation

The following applies to C.I.P. member states outside the EU and EFTA judicial areas: The Hilti DX 450 has been system and type tested. As a result, the tool bears the rectangular PTB approval mark showing approval number S 805. Hilti thus guarantees compliance with the approved type.

Further information

For more information on operation, technology, environment and recycling, follow this link: qr.hilti.com/manual/?id=2338162
This link is also to be found at the end of the documentation, in the form of a QR code.

References

• HILTI Country selector

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