GX 90-WF

About these operating instructions

• Read these operating instructions before the product is used or operated for the first time. This is a prerequisite for safe, trouble-free handling and use of the product.
  
• Observe the safety instructions and warnings in these operating instructions and on the product.
  
• Always keep the operating instructions with the product and make sure that the product is accompanied by these operating instructions only, when the product is given to other persons.
  

Explanation of symbols

Warnings

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

Symbols in the operating instructions

The following symbols are used in these operating instructions:

	Comply with the operating instructions
	Instructions for use and other useful information
	Dealing with recyclable materials
	Do not dispose of electric equipment and batteries as household waste
	Hilti Li‑ion battery
	Hilti charger

Symbols in illustrations

The following symbols are used in illustrations:

	These numbers refer to the illustrations 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 illustration and refer to the numbers used in the key in the product overview section.
	These characters are intended to specifically draw your attention to certain points when handling the product.

Product-dependent symbols

Additional symbols

The following symbols can be used additionally in this documentation or on the product:

	General warning
	Wear eye protection
	Wear hearing protection
	Wear a hard hat
	Wear protective gloves
	The product supports near-field communication (NFC) technology compatible with iOS and Android platforms.
	Li-ion battery
	Never use the battery as a striking tool.
	Do not drop the battery. Never use a battery that has suffered an impact or is damaged in any other way.

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

  GX fastening tool	GX 90-WF
  Generation	01
  Serial no.

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 instructions

Requirements to be met by users

• The tool is intended for professional use.
  
• The tool may be operated, serviced and repaired only by authorized, trained personnel. This personnel must be informed of any special hazards that may be encountered.
  

Personal safety

• Stay alert, watch what you are doing and use common sense when operating a direct fastening tool. Do not use the tool when you are tired or under the influence of drugs, alcohol or medication. Take a break if you experience pain or feel unwell. A moment of inattention while operating tools may result in serious personal injury.
  
• Avoid unfavorable body positions. Make sure you work from a safe stance and stay in balance at all times.
  
• Wear non-skid shoes.
  
• Never point the tool toward yourself or other persons.
  
• Never press the nose of the tool against your hand or other part of your body, or against another person. Do not, under any circumstances, position your hand or other part of your body in the vicinity of the nosepiece. Pressing the nosepiece against a part of the body can lead to severe injury, due to unintentional actuation and firing of the fastener.
  
• Do not place your free hand directly behind the material being fastened.
  
• Do not position your free hand in the vicinity of the nosepiece.
  
• Keep other people away from the working area, especially children.
  
• Keep the arms slightly bent while operating the tool (do not straighten the arms).
  
• Both the user and any other persons in the vicinity must wear suitable personal protective equipment including adequate eye protection, ear protectors and a hard hat.
  

Careful handling and use of direct fastening tools.

• Never leave a loaded tool unattended.
  
• Remove the gas can from the tool before transporting the tool.
  
• Always unload the tool (remove the battery, gas can and nails) before cleaning, servicing, and repair work, before a break in your work, and for storing the tool.
  
• Store unused gas cans and tools that are not currently being used in a dry place where they are not exposed to moisture and excessive temperatures.
  
• To ensure that the tool functions faultlessly and as intended, always check the tool and accessories for possible damage before use. Check that moving parts function faultlessly, 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. Damaged protective devices and parts that are not included in the service package available as an accessory (see the section headed "Care of the tool") must be properly repaired or replaced by Hilti Service unless otherwise stated in the operating instructions.
  
• Always hold the tool firmly when making a fastening. This will reduce the possibility of the fastener being deflected by the material into which it is driven.
  
• Never attempt to re-drive a fastener. Never drive a fastener on top of another previously-driven fastener. This may lead to fastener breakage and jamming.
  
• Always observe the application guidelines. For more information, consult the Hilit Fastening Technology Manual.
  
• Do not pull the nosepiece back with your hand or with an object. Under certain circumstances, this could make the tool ready to fire. When the tool is ready to fire, fasteners or the piston could be driven inadvertently into parts of the body.
  

Workplace

• Make sure that the workplace is well lit.
  
• Operate the tool only in well ventilated working areas.
  
• Drive fasteners only into wood and other suitable wood materials (see "Intended use"): Driving a fastener into other materials may cause the fastener to break, shatter or to be driven right through.
  
• Before driving fasteners, check that no one is present immediately behind or below the working surface.
  
• Keep the workplace tidy. Objects which could cause injury should be removed from the working area. Untidiness at the workplace can lead to accidents.
  
• Keep the grips dry, clean and free from oil and grease.
  
• Take the influences of the surrounding area into account. Do not expose the appliance to rain or snow and do not use it in damp or wet conditions. Do not use the appliance where there is a risk of fire of explosion.
  
• Concealed electrical cables or gas and water pipes present a serious hazard if damaged while you are working. Therefore, check the working area before you begin, e.g. using a metal detector. External metal parts of the appliance or machine may become live, for example, when an electric cable is damaged accidentally.
  
• Only hold the tool by its insulated gripping surfaces if carrying out work where the insert tool may come into contact with concealed wiring. Metal parts of the power tool can also become live, resulting in electric shock, if contact is made with a live cable.
  

Thermal safety rules

• If the tool overheats, remove the gas can and allow the tool to cool down. Do not exceed the specified maximum fastener driving rate.
  
• Always wear gloves if cleaning or maintenance has to be carried out before the tool has been allowed to cool down.
  

Careful handling and use of gas cans.

• Read the safety data sheet for the gas can for information about use, care and maintenance and first-aid measures.
  

Careful handling and use of batteries

• Comply with the following safety instructions for the safe handling and use of Li-ion batteries. Failure to comply can lead to skin irritation, severe corrosive injury, chemical burns, fire and/or explosion.
  
• Use only batteries that are in perfect working order.
  
• Treat batteries with care in order to avoid damage and prevent leakage of fluids that are extremely harmful to health!
  
• Do not under any circumstances modify or tamper with batteries!
  
• Do not disassemble, crush or incinerate batteries and do not subject them to temperatures over 80 °C (176 °F).
  
• Never use or charge a battery that has suffered an impact or been damaged in any other way. Check your batteries regularly for signs of damage.
  
• Never use recycled or repaired batteries.
  
• Never use the battery or a battery-operated power tool as a striking tool.
  
• Never expose batteries to the direct rays of the sun, elevated temperature, sparking, or open flame. This can lead to explosions.
  
• Do not touch the battery poles with your fingers, tools, jewelry, or other electrically conductive objects. This can damage the battery and also cause material damage and personal injury.
  
• Keep batteries away from rain, moisture and liquids. Penetrating moisture can cause short circuits, electric shock, burns, fire and explosions.
  
• Use only chargers and power tools approved for the specific battery type. Read and follow the relevant operating instructions.
  
• Do not use or store the battery in explosive environments.
  
• If the battery is too hot to touch, it may be defective. Put the battery in a place where it is clearly visible and where there is no risk of fire, at an adequate distance from flammable materials. Allow the battery to cool down. If it is still too hot to touch after an hour, the battery is faulty. Consult Hilti Service or read the document entitled "Instructions on safety and use for Hilti Li-ion batteries".
  
  Observe the special guidelines applicable to the transport, storage and use of lithium-ion batteries.
  Read the instructions on safety and use of Hilti Li-ion batteries that you can access by scanning the QR code at the end of these operating instructions.
  

Product overview

1. Tool body
   
2. Grip
   
3. Nosepiece
   
4. Magazine
   
5. Rating plate
   
6. Gas can compartment
   
7. Battery
   
8. Air vents
   
9. Casing cover
   
10. Trigger
    
11. Adjusting wheel
    
12. Nail pusher
    
13. Belt hook
    
14. LED
    
15. Adapter for surface protection
    
16. Sliding sleeve
    

Intended use

The tool is for fastening wood to wood using specially manufactured fasteners. The tool is suitable for use with solid wood, laminated timber, plywood, chipboard materials (e.g. coarse oriented-strand board), fiberboard materials (e.g. medium density fiberboard), and veneer materials (e.g. Multiplex). The tool is intended for use by professionals in the timber construction industry. For usage recommendations, consult the Hilti Fastening Technology Manual.

The tool, gas can and fasteners form a single technical unit. This means that trouble-free fastening with this tool can be ensured only when it is used together with the Hilti nails and Hilti gas cans specially manufactured for it. The fastening and application recommendations made by Hilti apply only when these conditions are observed. The tool is for hand-held use only. Do not tamper with or attempt to make alterations to the machine.

• Use only Hilti lithium‑ion batteries of the B 7 series with this product.

• For these batteries, use only the C 7 battery charger approved by Hilti . More information is available from your Hilti Store or from www.hilti.group

Deep discharge protection

• To restore operational readiness, briefly remove the battery and reinsert it (battery reset).
  

Items supplied

Power tool in case, battery, charger, cleaning cloth, operating instructions.
Other system products approved for use with this product can be found at your local Hilti Store or at: www.hilti.group

System components for operating the tool

The following items are required to use the tool: Power tool, charged B 7 Li ion battery, GC 31 or GC 32 gas can and GX-WF nails for wood.

Direct fastening tool

Application	Nailing to squared timber
Weight (including battery)	3.7 kg (8.2 lb)
Dimensions	384 mm x 134 mm x 381 mm (15.1 in x 5.3 in x 15.0 in)
Power regulation	None
Maximum magazine capacity	75 pcs
Magazine angle	34° (0.6 rad)
Maximum fastener driving rate in continuous operation	1,200 h
Work with interruptions	up to 3 fastenings per second
Caliber (gas can)	40 g (1.4 oz)
Operating / ambient temperature with GC 31 gas can	−5 ℃ … 45 ℃ (23 ℉ … 113 ℉)
Operating / ambient temperature with GC 32 gas can	−10 ℃ … 45 ℃ (14 ℉ … 113 ℉)
Nail length	50 mm … 90 mm (2.0 in … 3.5 in)
Nail diameter	2.8 mm … 3.1 mm (0.11 in … 0.12 in)

Lithium‑ion batteries

Battery operating voltage	7.2 V
Ambient temperature for operation	−17 ℃ … 60 ℃
Storage temperature	−20 ℃ … 40 ℃
Battery charging starting temperature	−10 ℃ … 45 ℃

Noise information and acceleration in accordance with EN 15895

The sound pressure and vibration values given in these instructions have been measured in accordance with a standardized test and may be used to compare one fastening tool with another. They may be used for a preliminary assessment of exposure. The data given represents 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 may 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 tool is not actually in use. This may 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 direct fastening tool and its additional equipment or accessories, keeping the hands warm, organization of work patterns.
Noise information

Emission sound pressure level at the workplace (LpA, 1s)	106 dB(A)
Peak sound pressure level at the workplace (LpC, peak)	138 dB (C)
Sound power level (LWA, 1S)	108 dB(A)
Uncertainty, noise (KpA)	2 dB(A)

Recoil

Energy-equivalent acceleration (ahw, RMS(3))

Results, nail size 90x3.1 mm in solid spruce timber <2.5 m/s2

Inserting nails

1. Insert the fasteners into the magazine from below, pointing in the right direction.
   

2. Push the fasteners as far as they will go toward the nosepiece.
   
   The nail strip could suffer damage if the nail pusher is allowed to strike it with force. Do not allow the nail pusher to strike the nail strip with force.
   

Preparing the gas can

• Transport lock for gas can.
  
  The gas can is fitted with a transport lock. Remove the lock before inserting the gas can into the tool.
  

Removing the transport lock

1. Lift the safety cap and metering valve off the gas can.
   
2. Disconnect the safety cap from the metering valve.
   
3. Insert the metering valve with the front hooking groove into the gas can notch.
   
   The metering valve has a front and a rear hooking groove.
   
4. Press the rear hooking groove firmly over the lip of the gas can until the metering valve snaps into place on the can.
   

Inserting the gas can

1. Open the cover of the gas can compartment by pressing it upwards and to the rear.
   
2. Push the gas can and metering valve into the red adapter.
   
3. Close the cover by pressing it down with your thumb until the latch snaps into engagement.
   

Inserting the battery

1. Before inserting the battery, make sure that the battery contacts and the contacts in the tool are free of foreign bodies.
   
2. From below, push the battery into the opening at the end of the grip until it snaps into place. The LED briefly lights up in green to signal that the tool is ready for use.
   

3. Charge the battery fully before using the tool for the first time.
   

Battery state of charge

Settings at the nosepiece

• You can control the penetration depth of the nails by changing the position of the nosepiece. Use the adjusting wheel for this purpose.
  

Protecting sensitive surfaces

• Use the adapter for surface protection when working on visible surfaces that are easily marked, for example building facades.
  
  The surface protection adapter reduces the possibility of the nosepiece leaving marks on the surface of the wood.
  

Unintentional firing safety device

1. Never operate the product without the unintentional firing safety device (sliding sleeve).
   
2. The tool has a safety device to prevent it from being triggered incorrectly. The sliding sleeve prevents the nosepiece from being pushed back deliberately or unknowingly. This prevents accidental releases.
   

Driving nails

1. Position the nosepiece on the working surface and press the tool against the surface until the nosepiece is fully compressed.
   
2. Drive the fastener by pulling the trigger.
   
3. Release the trigger and lift the tool completely clear of the surface.
   

Removing the battery

1. Press both battery release buttons.
   
2. Pull the battery downwards out of the power tool.
   

Removing the gas can

1. Open the gas can compartment cover.
   
2. Remove the gas can.
   
3. Close the gas can compartment.
   

Unloading nail strips

1. Release the catch on the nail pusher by pressing the black button.
   
2. Carefully allow the pusher to slide slowly toward the nosepiece until it stops.
   
3. Allow the nails in the magazine to slide downwards.
   
4. Press the internal pawl on the bottom end of the magazine. You can now completely remove the nails from the magazine.
   

Tool hook

• You can use the tool hook to hook the tool to your belt, a ladder, or a roof batten. Press the belt hook towards the tool in the direction of the longitudinal axis of the magazine. This releases the belt hook from its locked position and it can then be swung in or out.
  

Care and maintenance of the tool

1. Clean the outside of the power tool at regular intervals with a slightly damp cloth.
   
2. Never operate the tool when the ventilation slots are blocked. Clean the ventilation slots carefully using a dry brush.
   
3. Do not permit moisture or foreign objects to enter the interior of the tool or the battery.
   
4. Remove the tool from its case and allow it to dry out if moisture has entered the tool. To do this, remove the battery and keep the gas can compartment cover at the rear in the open position.
   
5. Always keep the grip surfaces of the appliance free from oil and grease.
   
6. Do not use a spray, steam pressure cleaning equipment or running water for cleaning.
   
7. Do not use cleaning agents containing silicone.
   
8. Make sure that there is no oil or grease on the battery contacts.
   

Repair of the power tool

• Regularly check all external parts of the tool for damage and check that all controls are in full working order. Do not operate the tool if parts are damaged or if controls are not in full working order.
  
  If damage occurs, have the tool repaired by Hilti Service only.
  

Cleaning the appliance

• Clean the power tool at regular intervals. Use only Hilti products or products of comparable quality for cleaning.
  
  • The required materials, tools, and documentation are available from Hilti as accessories.
    
  • You can have the necessary maintenance work carried out by Hilti . To do so, contact your local Hilti branch.
    

Cleaning the piston

Dirt and remains of the nail collation strip may hinder piston movement. Malfunctions occur increasingly, i.e. the tool is triggered but no fastener is driven. In this case, the piston should be cleaned as follows:

1. Remove the battery, the gas can and the fasteners from the tool.
   
2. Use a screwdriver to push the piston back as far as it will go.
   
3. Spray cleaning fluid generously into the tool nosepiece.
   
4. First replace the battery and then the gas can.
   
5. Pull the nail pusher back by hand and then trigger the tool five times, without driving fasteners, with the nosepiece pressed against a suitable surface (see the section headed "Intended use").
   
6. Reload the fasteners and continue working with the tool in the usual way.
   
7. If necessary, repeat steps 1-6.