DEWALT DCD794 Drill Driver Hammerdrill Instruction Manual

DEWALT DCD794 Drill Driver Hammerdrill

Product Specifications:

• Model: DCD794
• Intended Use: Professional drilling, screwdriving, and hammer drilling applications
• Features: Variable speed trigger switch, forward/reverse control button, keyless chuck, worklight, etc.

Product Usage Instructions

Safety Warnings:

It is crucial to read and understand all safety warnings, instructions, illustrations, and specifications provided in the manual. Failure to do so may result in electric shock, fire, or serious injury.

Parts Overview:

• Battery pack
• Battery pack release button
• Main handle
• Variable speed trigger switch
• Forward/reverse control button
• Mode selection collar
• Speed selector
• Worklight
• Keyless chuck

General Power Tool Safety Warnings:

1. Work Area Safety:
   • Keep work area clean and well-lit to prevent accidents.
   • Avoid operating power tools in explosive atmospheres.
   • Ensure children and bystanders are kept away during tool operation.
2. Electrical Safety:
   • Use power tool plugs that match the outlet without modification.
   • Avoid using adapter plugs with earthed (grounded) power tools.

Frequently Asked Questions

• Q: What is the key feature of the DCD794 model?
  • A: The key feature of the DCD794 model is its variable speed trigger switch, allowing precise control over drilling and driving operations.
• Q: Can the DCD794 be used in wet conditions?
  • A: No, the DCD794 should not be used under wet conditions or in the presence of flammable liquids or gases to ensure user safety and proper functionality of the tool.
• Q: Is supervision necessary when using the DCD794?
  • A: Yes, supervision is required when inexperienced operators use the DCD794 to prevent accidents and ensure safe usage of the tool.

DCD794

• 20V Max* Compact 1/2″ (13 mm) Drill/Driver

DCD799

• 20V Max* Compact 1/2″ (13 mm) Drill/Driver/Hammerdrill

Product Overview

1. Battery pack
2. Battery pack release button
3. Main handle
4. Variable speed trigger switch
5. Forward/reverse control button
6. Mode selection collar
7. Speed selector
8. Worklight
9. Keyless chuck
10. Chuck sleeve

If you have questions or comments, contact us.

• WWW.DEWALT.com
• 1-800-4-DEWALT

WARNING: Read all safety warnings, instructions, illustrations, and specifications in this manual, including the battery and charger sections provided in an original tool manual or the separate Batteries and Chargers manual. Manuals can be obtained by contacting Customer Service as described elsewhere in this manual. Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury

Definitions: Safety Alert Symbols and Words

This instruction manual uses the following safety alert symbols and words to alert you to hazardous situations and your risk of personal injury or property damage.

• DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
• WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
• CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. (Used without word) Indicates a safety related message.
• NOTICE: Indicates a practice not related to personal injury which, if not avoided, may result in property damage.

Intended Use

This drill/driver/hammerdrill is designed for professional drilling and screwdriving and hammer drilling applications.

• DO NOT use under wet conditions or in presence of flammable liquids or gases.
• DO NOT let children come into contact with the tool. Supervision is required when inexperienced operators use this tool.

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

• a ) Keep work area clean and well lit. Cluttered or dark areas invite accidents.
• b ) 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.
• c ) Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical Safety

• a ) 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.
• b ) 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.
• c ) Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
• d ) 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.
• e ) 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.
• f ) If operating a power tool in a damp location is unavoidable, use a ground fault circuit interrupter (GFCI) protected supply. Use of a GFCI reduces the risk of electric shock.

Personal Safety

• a ) 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.
• b ) 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.
• c ) 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 energizing power tools that have the switch on invites accidents.
• d ) 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.
• e ) Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
• f ) Dress properly. Do not wear loose clothing or jewelry. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewelry or long hair can be caught in moving parts.
• g ) 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.
• h ) 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

• a ) 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.
• b ) 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.
• c ) 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.
• d ) 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.
• e ) 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.
• f ) Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
• g ) 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.
• h ) 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

Battery Tool Use and Care

• a ) Recharge only with the charger specified by the manufacturer. A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
• b ) Use power tools only with specifically designated battery packs. Use of any other battery packs may create a risk of injury and fire.
• c ) When battery pack is not in use, keep it away from other metal objects, like paper clips, coins, keys, nails, screws or other small metal objects, that can make a connection from one terminal to another. Shorting the battery terminals together may cause burns or a fire.
• d ) Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact accidentally occurs, flush with water. If liquid contacts eyes, additionally seek medical help. Liquid ejected from the battery may cause irritation or burns.
• e ) Do not use a battery pack or tool that is damaged or modified. Damaged or modified batteries may exhibit unpredictable behavior resulting in fire, explosion or risk of injury.
• f ) Do not expose a battery pack or tool to fire or excessive temperature. Exposure to fire or temperature above 265 °F (130 °C) may cause an explosion.
• g ) Follow all charging instructions and do not charge the battery pack or tool outside the temperature range specified in the instructions. Charging improperly or at temperatures outside the specified range may damage the battery and increase the risk of fire.

Service

• a ) 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.
• b ) Never service damaged battery packs. Service of battery packs should only be performed by the manufacturer or authorized service providers.

DRILL/DRIVER/IMPACT DRILL SAFETY WARNINGS

Safety Instructions for All Operations

• a ) Wear ear protectors when impact drilling. Exposure to noise can cause hearing loss.
• b ) Hold the power tool by insulated gripping surfaces, when performing an operation where the cutting accessory or fasteners may contact hidden wiring. Cutting accessory or fastener contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the operator an electric shock.

Safety Instructions When Using Long Drill Bits

• a ) Never operate at higher speed than the maximum speed rating of the drill bit. At higher speeds, the bit is likely to bend if allowed to rotate freely without contacting the workpiece, resulting in personal injury.
• b ) Always start drilling at low speed and with the bit tip in contact with the workpiece. At higher speeds, the bit is likely to bend if allowed to rotate freely without contacting the workpiece, resulting in personal injury.
• c ) Apply pressure only in direct line with the bit and do not apply excessive pressure. Bits can bend causing breakage or loss of control, resulting in personal injury

Additional Safety Warnings for Drills

• Do not operate this tool for long periods of time. Vibration caused by the operating action of this tool may cause permanent injury to fingers, hands, and arms. Use gloves to provide extra cushion, take frequent rest periods, and limit daily time of use.
• Hammer bits and tools get hot during operation. Wear gloves when touching them.

Additional Safety Information

WARNING: Never modify the power tool or any part of it. Damage or personal injury could result.
WARNING: ALWAYS use safety glasses. Everyday eyeglasses are NOT safety glasses. Also use face or dust mask if cutting operation is dusty. ALWAYS WEAR CERTIFIED SAFETY EQUIPMENT:

• ANSI Z87.1 eye protection (CAN/CSA Z94.3),

• ANSI S12.6 (S3.19) hearing protection,

• NIOSH/OSHA/MSHA respiratory protection.
  WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:

• lead from lead‑based paints,

• crystalline silica from bricks and cement and other masonry products, and

• arsenic and chromium from chemically‑treated lumber.
  Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well-ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.

• Wear protective clothing and wash exposed areas with soap and water. Allowing dust to get into your mouth, eyes, or lay on the skin may promote absorption of harmful chemicals. Direct particles away from face and body.

• Use the appropriate dust extractor vacuum to remove the vast majority of static and airborne dust. Failure to remove static and airborne dust could contaminate the working environment or pose an increased health risk to the operator and those in close proximity.

• Use clamps or other practical ways to secure and support the workpiece to a stable platform. Holding the work by hand or against your body is unstable and may lead to loss of control and injury.

• Air vents often cover moving parts and should be avoided. Loose clothes, jewelry or long hair can be caught in moving parts.
  CAUTION: When not in use, place tool on its side on a stable surface where it will not cause a tripping or falling hazard. Some tools with large battery packs will stand upright on the battery pack but may be easily knocked over.

The label on your tool may include the following symbols. The symbols and their definitions are as follows

ASSEMBLY AND ADJUSTMENTS

WARNING: To reduce the risk of serious personal injury, turn unit off and remove the battery pack before making any adjustments or removing/installing attachments or accessories. An accidental start‑up can cause injury.

Belt Hook and Bit Clip (Fig. B)

(Optional Accessory)

• WARNING: To reduce the risk of serious personal injury, ONLY use the tool’s belt hook to hang the tool from a work belt. DO NOT use the belt hook for tethering or securing the tool to a person or object during use. DO NOT suspend tool overhead or suspend objects from the belt hook.
• WARNING: To reduce the risk of serious personal injury, ensure the screw holding the belt hook is secure.
• IMPORTANT: When attaching or replacing the belt hook or bit clip, use only the screw 11 that is provided. Be sure to securely tighten the screw.
  The belt hook 12 and bit clip 13 can be attached to either side of the tool using only the screw provided, to accommodate left- or right-handed users. If the belt hook or bit clip is not desired at all, they can be removed from the tool.
  To move the belt hook or bit clip, remove the screw that holds it in place then reassemble on the opposite side. Be sure to securely tighten the screw.

Installing a Bit or Accessory into a Keyless Chuck (Fig. C)

WARNING: Do not attempt to tighten drill bits (or any other accessory) by gripping the front part of the chuck and turning the tool on. Damage to the chuck and personal injury may result. Always lock off trigger switch and disconnect tool from power source when changing accessories.

WARNING: Always ensure the bit is secure before starting the tool. A loose bit may eject from tool causing possible personal injury.

To insert a drill bit 14 or another accessory, follow these steps.

1. Turn the tool off and remove battery pack.
2. Grasp the black sleeve of the chuck with one hand and use the other hand to secure the tool. Rotate the sleeve counterclockwise far enough to accept the desired accessory.
3. Insert the accessory about 3/4″ (19 mm) into the chuck 9 and tighten securely by grasping and rotating the chuck sleeve 10 clockwise with one hand while holding the tool with the other. When the chuck is nearly tightened you will hear a clicking sound. Tighten the sleeve until the clicks stop and it will not rotate any further. Your tool is equipped with an automatic spindle lock mechanism. This allows you to open and close the chuck with one hand.
4. Be sure to tighten the chuck with one hand on the chuck sleeve and one hand holding the tool for maximum tightness.
5. To release the accessory, repeat steps 1 and 2 above.

OPERATION

WARNING: To reduce the risk of serious personal injury, turn unit off and remove the battery pack before making any adjustments or removing/installing attachments or accessories. An accidental start‑up can cause injury.

Speed Selection (Fig. D)

The tool features two-speed settings for greater versatility. NOTE: Do not change speeds when the tool is running. Always allow the tool to come to a complete stop before changing speed.

1. To select speed 1 (high torque setting), turn the tool off and permit it to stop. Slide the speed selector 7 forward (toward the chuck).
2. To select speed 2 (high-speed setting), turn the tool off and permit it to stop. Slide the speed selector back (away from the chuck).
3. If the tool does not change speeds, confirm that the speed selection switch is completely engaged in the forward or back position.

Mode Selection (Fig. E)

The mode selection collar 6 can be used to select the correct operating mode depending upon the planned application. To select, rotate the collar until the desired symbol aligns with the arrow.

WARNING: When the mode selection collar is in the drill or hammer drill positions, the drill will not clutch. The drill may stall if overloaded, causing a sudden twist

DCD794

symbol| Mode
| Drilling
1- 15| Screwdriving (higher number = greater torque)
DCD799

symbol| Mode
| Drilling
1- 15| Screwdriving (higher number = greater torque)
__| Hammer drilling

Installing and Removing the Battery Pack (Fig. F)

• WARNING: Ensure the tool/appliance is in the off position before inserting the battery pack.
• NOTE: For best results, make sure your battery pack is fully charged.

1. To install battery pack  1  into the tool handle, align the battery pack with the rails inside the tool’s handle and slide it into the handle until the battery pack is firmly seated in the tool and ensure that it does not disengage.
2. To remove the battery pack from the tool, press the release button  2  and firmly pull the battery pack out of the tool handle. Insert it into the charger.

Proper Hand Position (Fig. G)

• WARNING: To reduce the risk of serious personal injury, ALWAYS use proper hand position as shown.
• WARNING: To reduce the risk of serious personal injury, ALWAYS hold securely in anticipation of a sudden reaction. Proper hand position requires one hand on the main handle  3  and the other hand holding the battery pack  1 .

Variable Speed Trigger and Forward/Reverse

Control Button (Fig. A)

The tool is turned on and off by pulling and releasing the variable speed trigger switch  4 . The farther the trigger is depressed, the higher the speed of the tool. Your tool is equipped with a brake. The chuck will stop as soon as the trigger switch is fully released.
A forward/reverse control button  5  determines the rotational direction of the tool and also serves as a lock‑off button.

• To select forward rotation (clockwise), release the trigger and depress the forward/reverse control button on the right side of the tool.
• To select reverse (counterclockwise), depress the forward/reverse control button on the left side of the tool.
  NOTE: The center position of the control button locks the tool in the off position. When changing the position of the control button, be sure the trigger is released.
  NOTE: Continuous use in variable speed range is not recommended. It may damage the switch and should be avoided.
  NOTE: The first time the tool is run after changing the direction of rotation, you may hear a click on start‑up. This is normal and does not indicate a problem.

Worklight (Fig. A)

The worklight  8  is activated when the trigger switch is depressed, and will automatically turn off 20 seconds after the trigger switch is released. If the trigger switch remains depressed, the worklight will remain on.
NOTE: The worklight is for lighting the immediate work surface and is not intended to be used as a flashlight.

Performing an Application (Fig. A, D, E)

• WARNING: To reduce the risk of personal injury, ALWAYS ensure workpiece is anchored or clamped firmly.
• WARNING: Always wait until the motor has come to a complete standstill before changing the direction of rotation.

Prior to Performing Work

• Set the speed selector  7 . Refer to Speed Selection.
• Install the appropriate bit or accessory into the chuck. Refer to the accessory installation instructions in this manual.

WARNING:

• Do not use this tool to mix or pump easily combustible or explosive fluids (benzine, alcohol, etc.).
• Do not mix or stir flammable liquids labeled accordingly.

Screwdriving

Your tool has a clutch with adjustable torque for driving and removing a wide array of fastener shapes and sizes. The numbers 1–15 on the mode selection collar  6  are used to set a torque range for screwdriving. The higher the number on the collar, the higher the torque and the larger the fastener which can be driven.

1. Turn the mode selection collar to the desired position. Refer to Mode Selection.
2. Pull the trigger switch applying pressure in a straight line with the bit until the fastener is seated at the desired depth in the workpiece.

Recommendations for Screwdriving

• Start with lower torque settings, then advance to higher torque settings to avoid damage to the workpiece or fastener.
• Make some practice runs in scrap or on unseen areas of the workpiece to determine the proper position of the mode selection collar.

Drilling

IMPORTANT: For MASONRY, such as brick, cement, cinder block, etc., use carbide‑tipped masonry bits.

1. Turn the mode selection collar  6  to the drill symbol. Refer to Mode Selection.

2. Place drill bit in contact with the workpiece.
   NOTE: Use sharp drill bit only.

3. Pull the trigger switch applying pressure in a straight line with the bit until it reaches the desired depth.

WARNING: Drill may stall if overloaded causing a sudden twist. Always expect the stall. Grip the drill firmly to control the twisting action and avoid injury.

Keep the motor running when pulling the bit back out of a drilled hole to prevent jamming.

Recommendations for Drilling

• When drilling, always apply pressure in a straight line with the bit, but do not push hard enough to stall the motor or deflect the bit.

IF THE DRILL STALLS:

• RELEASE TRIGGER SWITCH IMMEDIATELY, remove drill bit from work, and determine cause of stalling.
• DO NOT DEPRESS TRIGGER SWITCH ON AND OFF IN AN ATTEMPT TO START A STALLED DRILL—THIS CAN DAMAGE THE DRILL.
• To minimize stalling or breaking through the material, reduce pressure on drill and ease the bit through the last fractional part of the hole.
• Large holes (5/16″ to 1/2″ [7.9 mm to 12.7 mm]) in steel can be made easier if a pilot hole (5/32″ to 3/16″ [4 mm to 4.8 mm]) is drilled first.
• If drilling thin material or material that is prone to splinter, use a wood “back‑up” block to prevent damage to the workpiece.

Hammerdrilling DCD799

MPORTANT: Use carbide‑tipped or masonry bits rated for percussion drilling only.

1. Select the desired speed/torque range using the speed selector 7 to match the speed and torque to the planned operation. Turn the mode selection collar 6 to the hammerdrill symbol.
2. Pull the trigger, applying just enough pressure on the hammer to keep it from bouncing excessively or “rising” off the bit.

Recommendations for Hammer drilling

• Too much force will cause slower drilling speeds, overheating, and a lower drilling rate.
• A smooth even flow of material indicates the proper drilling rate.
• Drill straight, keeping the bit at a right angle to the work. Do not exert side pressure on the bit when drillling as this will cause clogging of the bit flutes and a slower drilling speed.
• When drilling deep holes, if the hammer speed starts to drop off, pull the bit partially out of the hole with tool still running to help clear debris from the hole.

MAINTENANCE

WARNING: To reduce the risk of serious personal injury, turn unit off and remove the battery pack before making any adjustments or removing/installing attachments or accessories. An accidental start‑up can cause injury.

Cleaning

WARNING: Blow dirt and dust out of all air vents with clean, dry air at least once a week. To minimize the risk of eye injury, always wear ANSI Z87.1 approved eye protection when performing this procedure.
WARNING: Never use solvents or other harsh chemicals for cleaning the non‑metallic parts of the tool. These chemicals may weaken the plastic materials used in these parts. Use a cloth dampened only with water and mild soap. Never let any liquid get inside the tool; never immerse any part of the tool into a liquid.
Your DeWALT power tool has been designed to operate over a long period of time with a minimum of maintenance. Continuous satisfactory operation depends upon proper tool care and regular cleaning.

Accessories

WARNING: Since accessories, other than those offered by DeWALT, have not been tested with this product, use of such accessories with this product could be hazardous. To reduce the risk of injury, only DeWALT-recommended accessories should be used with this product.
Recommended accessories for use with your product are available at extra cost from your local dealer or authorized service center. If you need assistance in locating any accessory, please contact DeWALT. Call 1‑800‑4‑DeWALT (1‑800‑433‑9258) or visit our website: www.dewalt.com.

Repairs

The charger and batteries are not serviceable. There are no serviceable parts inside the charger or battery pack.
WARNING: To assure product SAFETY and RELIABILITY, repairs, maintenance and adjustment (including brush inspection and replacement, when applicable) should be performed by a DeWALT factory service center or a DeWALT authorized service center. Always use identical replacement parts.

Register Online

Thank you for your purchase. Register your product now for:

• WARRANTY SERVICE: Registering your product will help you obtain more efficient warranty service in case there is a problem with your product.
• CONFIRMATION OF OWNERSHIP: In case of an insurance loss, such as fire, flood or theft, your registration of ownership will serve as your proof of purchase.
• FOR YOUR SAFETY: Registering your product will allow us to contact you in the unlikely event a safety notification is required under the Federal Consumer Safety Act.
  Register online at www.dewalt.com/account‑login

Three‑Year Limited Warranty

For warranty terms, go to

www.dewalt.com/support/warranty

To request a written copy of the warranty terms, contact: Customer Service at DeWALT Industrial Tool Co., 701 East Joppa Road, Towson, MD 21286 or call 1‑800‑4‑DeWALT (1‑800‑433‑9258).
LATIN AMERICA: This warranty does not apply to products sold in Latin America. For products sold in Latin America, see country‑specific warranty information contained in the packaging, call the local company or see website for warranty information.
FREE WARNING LABEL REPLACEMENT: If your warning labels become illegible or are missing, call 1‑800‑4‑DeWALT (1‑800‑433‑9258) for a free replacement

References

• DEWALT® Power Tools Official Site | Guaranteed Tough®
• DEWALT® Power Tools Official Site | Guaranteed Tough®
• Sign in & Create Account | DEWALT

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