DWS 225 (01)

About these operating instructions

• Warning! Read and understand all accompanying documentation, including but not limited to instructions, safety warnings, illustrations, and specifications provided with this product. Familiarize yourself with all the instructions, safety warnings, illustrations, specifications, components, and functions of the product before use. Failure to do so may result in electric shock, fire, and/or serious injury. Save all warnings and instructions for future reference.
  
• 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 accompanying documentation corresponds to the current state of the art at the time of printing. Please always check for the latest version on the product’s page on Hilti’s website. To do this, follow the link or scan the QR code in this documentation, marked with the symbol .
  
• Ensure that these 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:

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-dependent symbols

Symbols on the product

The following symbols can be used additionally on the product:

	Wear eye protection
	Wear ear protection
	Wear protective gloves
	Wear light respiratory protection
	Protection class II (double-insulated)
	Diameter
	Revolutions per minute
	Revolutions per minute

Product information

Hilti products are designed for professional use and may be operated, serviced and maintained only by trained, authorized personnel. 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

  Random orbital sander	DWS 225
  Generation	01
  Serial no.

Declaration of conformity

We declare, on our sole responsibility, that the product described here complies with the applicable directives and standards. A copy of the declaration issued by the certification department can be found at the end of this documentation.
The technical documentation is filed here:
Hilti Entwicklungsgesellschaft mbH | Tool Certification | Hiltistrasse 6 | 86916 Kaufering, Germany

General power tool safety warnings

WARNING Read all safety warnings, instructions, illustrations and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.
The term "power tool" in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
Work area safety

• Keep work area clean and well lit. Cluttered or dark areas invite accidents.
  
• Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
  
• Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.
  

Electrical safety

• Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.
  
• Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.
  
• Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
  
• Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock.
  
• When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock.
  
• If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock.
  

Personal safety

• Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury.
  
• Use personal protective equipment. Always wear eye protection. Protective equipment such as a dust mask, non-skid safety shoes, hard hat or hearing protection used for appropriate conditions will reduce personal injuries.
  
• Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energising power tools that have the switch on invites accidents.
  
• Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury.
  
• Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
  
• Dress properly. Do not wear loose clothing or jewellery. Keep your hair and clothing away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts.
  
• If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards.
  
• Do not let familiarity gained from frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe injury within a fraction of a second.
  

Power tool use and care

• Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.
  
• Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
  
• Disconnect the plug from the power source and/or remove the battery pack, if detachable, from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.
  
• Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.
  
• Maintain power tools and accessories. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.
  
• Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
  
• Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.
  
• Keep handles and grasping surfaces dry, clean and free from oil and grease. Slippery handles and grasping surfaces do not allow for safe handling and control of the tool in unexpected situations.
  

Service

• Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.
  

Belt sander and drum sander safety warnings

• Hold the power tool by insulated gripping surfaces, because the sanding surface may contact its own cord. Cutting a "live" wire may make exposed metal parts of the power tool "live" and could give the operator an electric shock.
  

Additional safety instructions

• Use the power tool only when it is in perfect working order.
  
• Never tamper with or modify the power tool in any way.
  
• The power tool is not intended for use by persons who have received no special training. Keep the power tool out of reach of children.
  
• Always hold the power tool firmly with both hands on the grips provided. Keep the grips dry, clean and free from oil and grease.
  
• After installing the backing pad, always install the screw cap.
  
• Check the power tool, the backing pad, the supply cord and the connections at regular intervals for wear.
  
• Check the power tool’s supply cord at regular intervals and have it replaced by a qualified specialist if found to be damaged.
  
• Check extension cords at regular intervals and replace them if found to be damaged. Do not touch the supply cord or extension cord if it is damaged while working. Unplug the supply cord from the power outlet.
  
• In the event of an interruption in the electricity supply, switch the power tool off and unplug it from the power outlet to prevent an unwanted restart when power is restored.
  

Product overview

1. Sanding head
   
2. Extractor
   
3. Gripping surfaces
   
4. Control panel
   
5. Power cord socket
   
6. Hose connector
   
7. Backing pad
   
8. Multi-purpose LED
   
9. On/off button
   
10. Speed indicator
    
11. Increase/reduce speed
    
12. Start/stop button
    

Intended use

The product is a hand-held, electrically powered random orbital sander. It is suitable for dry-sanding wood, wood-based materials, composites, varnishes, paints, plastics, plaster and filler compounds with wearing, replaceable sanding pads.

Possible misuse

• This product is not suitable for working on hazardous materials.
  
• This product is not suitable for working in a damp environment and use of the product for wet sanding is prohibited.
  
• Do not use backing pads with a nominal working speed lower than 8000 rpm.
  

LED indicators on the control panel

On the control panel there is a multi-purpose LED to indicate operating status or malfunction of the power tool, and an LED array for indicating speed (rpm).

Status	Meaning
A: Multi-purpose LED shows green	AC supply connected.
B: Multi-purpose LED shows green	Power tool switched on and/or start/stop button pressed, speed indicator active.
C: Multi-purpose LED flashes green/red	Speed is increased/reduced; selected speed is indicated by the LEDs.
D: Multi-purpose LED shows red	Overtemperature warning.
D: Multi-purpose LED quick-flashes green/red	Voltage outside appropriate range.

Sanding head

The sanding head is 180° flexible, enabling the operator to reach the surface to be sanded from different angles. The power tool can track the operator's movements, so the operator can adopt an ergonomic working position.

Items supplied

Random orbital sander, operating instructions.
Other system products approved for use with this product can be found at your local Hilti Store or at: www.hilti.group

Positioning the sanding pad

1. Unplug the supply cord from the power outlet.
   
2. Select a suitable sanding pad and secure it to the backing pad. Make sure that the sanding pad is centered and securely seated against the backing pad.
   

Switching on

• Press the on/off button.
  
  • The multi-purpose LED shows green.
    
  Warning! The power tool develops torque as soon as the motor starts.
  If possible, always use the power tool in combination with an industrial vacuum cleaner.
  

Sanding

1. Set the desired speed. To do this, use the "Increase/reduce speed" buttons as appropriate.
   
   • Speed can be adjusted in the range from 4000 to 8000 rpm. The LED array indicates the set speed.
     
2. Position the power tool with the whole of its sanding face on the surface to be sanded.
   
3. Press the start/stop button.
   
   • The sanding operation starts
     
4. Applying moderate pressure, move the power tool steadily over the surface to be sanded.
   

Ending the sanding operation

1. Lift the power tool clear of the surface being sanded before you end the sanding operation.
   
   • Otherwise, the excessive speed could cause the abrasive to leave marks in the surface being sanded.
     
2. Press the start/stop button.
   

Switching off

1. Press the on/off button.
   
2. Do not set the power tool down until the backing pad has come to a complete stop.
   

Assembly modules

1. Arbor and bearing module
   
2. Sanding head
   
3. Securing screw for sanding head
   
4. Cap for screw
   
5. Backing pad with securing screws
   

Changing the backing pad

Tools needed: 19 mm hex bit socket and Torx screwdriver.

1. Disconnect the supply cord plug from the power outlet.
   
2. Remove the screw cap.
   
3. Remove the backing pad screw.
   
4. Remove the old backing pad.
   
5. Install the new backing pad positioned correctly on the spindle.
   
6. Using the hex bit socket, tighten the backing pad screw to 10 Nm.
   
7. Install the screw cap.
   
   • Tighten the securing screw of the screw cap to 0.8 Nm.
     
8. Check that the backing pad is installed correctly and not tilted.
   

Changing backing pad and attachment pad

Tools needed: Plain screwdriver.

1. Disconnect the supply cord plug from the power outlet.
   
2. Remove the 8 recessed screws.
   
3. Remove the attachment pad.
   
4. Remove the old backing pad.
   
5. Install the new backing pad positioned correctly on the spindle.
   
6. Secure a new attachment pad.
   
   • Re-install the 8 recessed screws.
     
7. Check that backing pad and attachment pad are installed correctly and do not tilt.