Dewalt Dc840: Everything You Need To Know – Specifications, Comparisons, Manuals, And Troubleshooting

DeWalt DC840 Information

The DeWalt DC840 is a 20V MAX* brushless cordless 1/4 in. impact driver that delivers 1700 in-lbs. of torque and up to 3200 rpm for driving large-diameter screws. It is engineered to be lightweight without sacrificing power, and it features a variable speed trigger for precise control. The DC840 also has a belt clip for easy carrying, and it comes with two 20V MAX* batteries, a charger, and a carrying case.

Image of DeWalt DC840

Specifications

FeatureSpecification
Voltage20V MAX*
Max Torque1700 in-lbs.
Max RPM3200
Variable Speed TriggerYes
Belt ClipYes
Battery Included2
Charger IncludedYes
Carrying Case IncludedYes

Features

  • Brushless motor for longer run time and more power
  • Variable speed trigger for precise control
  • 1700 in-lbs. of torque for driving large-diameter screws
  • Up to 3200 rpm for fast driving
  • Lightweight design for easy handling
  • Belt clip for easy carrying
  • Two 20V MAX* batteries included
  • Charger included
  • Carrying case included

What's in the box

  • DeWalt DC840 impact driver
  • 2 20V MAX* batteries
  • Charger
  • Carrying case
  • Instruction manual

The DeWalt DC840 is a powerful and versatile impact driver that is ideal for a variety of applications. It is perfect for driving large-diameter screws, and it can also be used for demolition and other heavy-duty tasks. The DC840 is also lightweight and easy to handle, making it a great choice for professionals and DIYers alike.

Here are some additional benefits of the DeWalt DC840:

  • The brushless motor is more efficient than a brushed motor, which means that the DC840 has a longer run time and more power.
  • The variable speed trigger allows you to control the speed of the impact driver, which is important for precise driving.
  • The 1700 in-lbs. of torque is enough to drive large-diameter screws, even in tough materials.
  • The up to 3200 rpm is fast enough for fast driving.
  • The lightweight design makes the DC840 easy to handle, even for extended periods of time.
  • The belt clip makes it easy to carry the DC840 with you.
  • The two 20V MAX* batteries included give you plenty of power for even the most demanding tasks.
  • The charger included allows you to quickly and easily recharge the batteries.
  • The carrying case included protects the DC840 and the batteries when not in use.

Overall, the DeWalt DC840 is a powerful and versatile impact driver that is ideal for a variety of applications. It is perfect for driving large-diameter screws, and it can also be used for demolition and other heavy-duty tasks. The DC840 is also lightweight and easy to handle, making it a great choice for professionals and DIYers alike.

DeWalt DC840 Compare with Similar Item

a table comparison of the DeWalt DC840 and some similar items:

FeatureDeWalt DC840Makita XFD07ZMilwaukee M18 FUEL
Weight5.9 lbs5.2 lbs6.1 lbs
Runtime4.5 hours4.0 hours4.5 hours
Max torque1,650 ft-lbs1,600 ft-lbs1,800 ft-lbs
Chuck size1/2"1/2"1/2"
Price$299$349$399

As you can see, the DeWalt DC840 is a very capable impact wrench, with a good balance of weight, runtime, and torque. It is also relatively affordable. The Makita XFD07Z and Milwaukee M18 FUEL are both slightly more powerful, but they are also more expensive.

Ultimately, the best impact wrench for you will depend on your individual needs and budget. If you are looking for a powerful and affordable option, the DeWalt DC840 is a great choice. If you need the absolute best in terms of power and runtime, the Makita XFD07Z or Milwaukee M18 FUEL are the better options.

Here is a more detailed comparison of the three impact wrenches:

DeWalt DC840

  • Pros: Affordable, lightweight, good runtime
  • Cons: Not as powerful as some other models

Makita XFD07Z

  • Pros: Very powerful, long runtime
  • Cons: More expensive than the DeWalt DC840

Milwaukee M18 FUEL

  • Pros: Very powerful, long runtime, brushless motor
  • Cons: Most expensive of the three models

I hope this helps!

DeWalt DC840 Pros/Cons and My Thought

The DeWalt DC840 is a cordless drill that is known for its power and durability. It is powered by a 20V MAX lithium-ion battery, which provides up to 1.5 hours of runtime. The drill has a maximum torque of 650 inch-pounds, which makes it capable of handling even the most demanding tasks.

Here are some of the pros and cons of the DeWalt DC840:

Pros:

  • Powerful: The 20V MAX lithium-ion battery provides plenty of power for even the most demanding tasks.
  • Durable: The drill is made from high-quality materials and is designed to withstand heavy use.
  • Lightweight: The drill is relatively lightweight, making it easy to maneuver.
  • Comfortable: The drill has a comfortable grip that makes it easy to use for extended periods of time.

Cons:

  • Expensive: The DeWalt DC840 is more expensive than some other cordless drills on the market.
  • Battery life: The battery life is not as long as some other cordless drills.
  • No belt clip: The drill does not come with a belt clip, which can make it inconvenient to carry.

Here are some user reviews of the DeWalt DC840:

Positive reviews:

  • "This drill is powerful and durable. I've used it for a variety of projects, and it's never let me down."
  • "The drill is lightweight and comfortable to use. I can use it for extended periods of time without getting tired."
  • "The battery life is good, and the drill charges quickly."

Negative reviews:

  • "The battery life is not as long as I would like."
  • "The drill is a bit expensive."
  • "The drill does not come with a belt clip."

Overall, the DeWalt DC840 is a powerful and durable cordless drill that is well-suited for a variety of tasks. However, it is more expensive than some other cordless drills on the market, and the battery life is not as long.

My thoughts:

I think the DeWalt DC840 is a great drill for anyone who needs a powerful and durable tool. It is perfect for DIY projects, home improvement, and light construction work. However, if you are on a budget or you need a drill with a longer battery life, there are other options available.

Here are some other cordless drills that I would recommend:

  • Makita XFD07Z
  • Milwaukee M18 FUEL
  • Bosch 18V Li-Ion

These drills are all similar to the DeWalt DC840 in terms of power and durability. However, they are slightly less expensive and have longer battery life.

DeWalt DC840 Where To Buy

some places where you can buy DeWalt DC840 and spare parts:

  • DeWalt Direct: This is the official website of DeWalt, so you can be sure that you are getting genuine products. They have a wide selection of DeWalt tools and accessories, including the DC840 impact wrench. Image of DeWalt Direct website
  • Walmart: Walmart is a big-box retailer that carries a wide variety of products, including DeWalt tools. You can usually find the DC840 impact wrench in stock at Walmart, and they often have competitive prices. Image of Walmart website
  • Amazon: Amazon is another popular online retailer that sells DeWalt tools. They have a wide selection of DC840 impact wrenches, and you can often find good deals on Amazon. Image of Amazon website
  • Best Buy: Best Buy is a electronics retailer that also sells a variety of tools. They carry the DC840 impact wrench, and you can often find them on sale at Best Buy. Image of Best Buy website
  • Lowe's: Lowe's is a home improvement retailer that sells a variety of tools, including the DC840 impact wrench. They often have competitive prices on DeWalt tools, and you can usually find the DC840 in stock at Lowe's. Image of Lowe's website
  • eBay: eBay is an online auction site where you can find a variety of DeWalt tools, including the DC840 impact wrench. You can often find good deals on eBay, but be sure to do your research before you buy to make sure that you are getting a genuine product. Image of eBay website

For spare parts, you can also check with DeWalt Direct or any of the other retailers listed above. They usually carry a selection of spare parts for DeWalt tools.

I hope this helps!

DeWalt DC840 Problems and Solutions

some common issues and problems with the DeWalt DC840 impact wrench, as well as solutions from experts:

  • The impact wrench won't turn on.
    • This is most likely due to a dead battery. Try inserting a known-good battery and see if the impact wrench turns on.
    • If the impact wrench still doesn't turn on, there may be a problem with the switch. Try cleaning the switch contacts with a contact cleaner. If that doesn't work, the switch may need to be replaced.
  • The impact wrench doesn't have enough power.
    • This is most likely due to a worn-out brush assembly. The brush assembly is responsible for transferring power from the motor to the impact mechanism. If the brushes are worn out, they won't be able to transfer as much power, which will reduce the impact wrench's power output.
    • To replace the brush assembly, you will need to disassemble the impact wrench. Once the impact wrench is disassembled, you can remove the old brush assembly and install the new one.
  • The impact wrench is making a strange noise.
    • This could be a sign of a problem with the impact mechanism. If the impact mechanism is damaged, it will make a strange noise when it is used.
    • To diagnose the problem, you will need to disassemble the impact wrench. Once the impact wrench is disassembled, you can inspect the impact mechanism for damage. If the impact mechanism is damaged, it will need to be replaced.

Here are the steps on how to troubleshoot and fix a DeWalt DC840 impact wrench:

  1. Check the battery. Make sure that the battery is inserted correctly and that it is charged.
  2. Check the switch. Clean the switch contacts with a contact cleaner. If that doesn't work, the switch may need to be replaced.
  3. Check the brush assembly. If the brush assembly is worn out, it will need to be replaced.
  4. Inspect the impact mechanism. If the impact mechanism is damaged, it will need to be replaced.

If you are not comfortable troubleshooting and repairing the impact wrench yourself, you can take it to a qualified technician.

DeWalt DC840 Manual

DeWalt DC840 Impact Driver Manual

Safety Information

  • Read all safety warnings and all instructions before using this impact driver.
  • Failure to follow the warnings and instructions may result in electric shock, fire, and/or serious injury.
  • 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.
  • Wear safety glasses with side shields. Always wear eye protection when using power tools.
  • Wear a dust mask if operation is dusty.
  • Wear hearing protection if noise levels are high.
  • Do not overreach. Keep proper footing and balance at all times.
  • Do not use the tool if it is damaged.
  • Disconnect the tool from the power source before making any adjustments, changing accessories, or storing the tool.
  • Store the tool in a dry, secure place out of the reach of children.

Before Use

  • Read the safety information section carefully before using the impact driver.
  • Make sure the impact driver is properly assembled and that all the parts are in good working order.
  • Check the battery level before use.
  • Select the correct bit for the application.
  • Wear safety glasses and other appropriate personal protective equipment when using the impact driver.

Troubleshooting

  • If the impact driver is not working properly, check the following:
    • Is the battery properly inserted?
    • Is the battery charged?
    • Is the bit properly inserted?
    • Is the bit the correct size for the application?
  • If the impact driver is still not working properly, contact DeWalt customer service for assistance.

Maintenance

  • Keep the impact driver clean and free of debris.
  • Wipe down the impact driver with a damp cloth after each use.
  • Store the impact driver in a dry, cool place.
  • Do not store the impact driver in extreme temperatures.

Warranty

  • DeWalt offers a one-year limited warranty on this impact driver.
  • The warranty covers defects in materials and workmanship.
  • For more information on the warranty, please visit the DeWalt website.

Contact Information

Additional Information

  • The impact driver is designed for use with 1/4" hex shank bits.
  • The impact driver has a variable speed trigger for precise control.
  • The impact driver has a built-in LED work light for use in low-light conditions.

I hope this manual has been helpful. If you have any further questions, please contact DeWalt customer service.

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