When it comes to power tools, a reliable drill is an essential component of any DIY enthusiast’s toolkit. The DeWalt DCD790 Type 2 drill is a popular choice, known for its durability and performance. However, like all tools, it can experience wear and tear over time. One of the critical components that may need attention is the transmission. In this comprehensive guide, we will walk you through the process of rebuilding the transmission on a DeWalt drill model DCD790 Type 2. With careful steps and some handy tips, you will save money and extend the life of your trusty drill.
Understanding the DCD790 Transmission Design
Before delving into the rebuild process, it is crucial to understand the functions and components of the transmission in the DCD790. The transmission is responsible for transferring power from the motor to the chuck, allowing for efficient drilling and fastening.
Key Components of the Transmission
The transmission in the DeWalt DCD790 consists of several critical parts:
- Gear Set: This includes both the high and low gears that allow for different levels of torque and speed.
- Gear Housing: Protects the gears and holds them in place.
- Planetary Gears: These help in reducing the speed and increase torque.
- Drive Shaft: Transfers the rotation from the motor to the gears.
- Bearings: Ensure smooth rotation and reduce friction within the assembly.
Understanding these components will help you identify potential issues when the transmission isn’t working correctly.
Gathering Your Tools and Materials
Before embarking on the rebuild, ensure you have the right tools and materials. This will streamline the process and prevent unnecessary interruptions.
| Tool/Material | Purpose |
|---|---|
| Phillips & Flathead Screwdrivers | To remove screws and components |
| Socket Set | For disassembling and reassembling parts |
| Pliers | Helpful for gripping and pulling components |
| Replacement Gears and Bearings | To replace worn-out parts |
| Clean Cloths | For cleaning dust and grease |
| Grease | For lubrication of the gears |
Having the right equipment on hand will make the rebuilding process much smoother.
Disassembling the DeWalt DCD790
Now that you are equipped with the necessary tools, it’s time to start disassembling the drill. Follow these steps carefully to avoid damaging any components.
Step 1: Remove the Battery
Before any work begins, ensure that the battery is removed. This is a crucial safety step to prevent accidental startup.
Step 2: Remove the Chuck
Using your appropriate wrench or pliers, carefully unscrew the chuck from the drill’s shaft. This will help you access the transmission components better.
Step 3: Unscrew Housing Case
Use your screwdrivers to remove the screws from the drill’s housing. Keep these screws in a securely labeled container to make reassembly easier later.
Step 4: Take Out the Motor
After removing the housing, you will see the motor and transmission assembly. Unscrew and detach the motor carefully to prevent any damage.
Extracting the Transmission
With the motor out of the way, you can now focus on extracting the transmission.
Step 1: Detach the Drive Shaft
The drive shaft is usually bolted to the body of the drill. Carefully take the drive shaft out to free the transmission.
Step 2: Remove the Gear Assembly
Once the drive shaft is detached, gently pull the gear assembly out of the housing. Be cautious here; gears can sometimes be tricky, and it’s critical to avoid stripping them.
Inspecting the Components
With the transmission removed, you will now want to inspect each component for signs of wear or damage.
Checking Gears and Bearings
Inspect each gear for any visible wear, such as chipped teeth or unusual stiffness. Bearings should be checked for smooth rotation; if they feel rough or stuck, they need replacing.
Cleaning Components
Before rebuilding, take the time to clean all components. Use a clean cloth to wipe down gears and bearings to remove any old grease and debris.
Rebuilding the Transmission
Now that the components are cleaned and inspected, it’s time to rebuild the transmission.
Step 1: Replace Worn Parts
If you’ve identified any worn gears or bearings, replace them with new parts. Make sure to use parts specifically designed for the DCD790 Type 2 to ensure compatibility.
Step 2: Apply Grease
Before reassembling, apply a thin layer of grease to the gears and bearings. Proper lubrication is essential for smooth operation and increased lifespan of your drill. Too much grease can attract dust and debris, so moderation is key.
Step 3: Reassemble the Gear Assembly
Once cleaned and lubricated, carefully reassemble the gear set in the correct order. Pay attention to how the components fit together, as this can significantly affect performance.
Reinstalling the Transmission
After rebuilding the transmission, it’s time to put it back into the drill.
Step 1: Insert the Gear Assembly
Carefully slide the gear assembly back into the drill housing, ensuring that it’s aligned properly with the drive shaft.
Step 2: Reattach the Motor
Once the transmission is securely positioned, reattach the motor. Check that the motor’s connectors align perfectly with the transmission input.
Completing the Reassembly
With the transmission and motor in place, it’s now time to finish reassembly.
Step 1: Replace the Housing
Position the housing over the transmission and motor, ensuring all components are adequately seated. Screw the housing back into place securely.
Step 2: Reattach the Chuck
Once the housing is secured, it’s time to reattach the chuck. Ensure it’s tightened properly, as this is essential for effective operation.
Step 3: Insert the Battery
Before testing the drill, reinsert the battery.
Testing Your Rebuilt Drill
Now that everything is reassembled, it’s time to test the drill.
Perform a Functionality Check
Switch on the drill and allow it to run for a short time. Listen for any unusual noises, which may indicate improper installation or remaining issues with the transmission. Test both the high and low gears to confirm that they engage smoothly.
Final Inspection
Inspect the drill for any loose screws or components. Ensure that everything appears to be functioning as intended.
Conclusion
Rebuilding the transmission on a DeWalt DCD790 Type 2 drill may seem like a daunting task; however, with the right tools and knowledge, it can be an incredibly rewarding experience. By understanding the critical components, carefully disassembling and inspecting parts, and correctly rebuilding, you can extend the life of your powerful tool. Not only will you save money on repairs, but you’ll also gain invaluable skills that can serve you well in your DIY projects.
Always remember to follow safety precautions during the process, and don’t hesitate to consult resources or professionals if needed. Happy drilling!
What are the common symptoms that indicate a transmission issue in my DeWalt DCD790 Type 2 drill?
The common symptoms of a transmission issue in your DeWalt DCD790 Type 2 drill include unusual noises such as grinding or whining sounds during operation. Additionally, you may notice a loss of power or reduced drilling capability, where the drill is unable to maintain its speed under load or struggles to penetrate materials. If you experience these problems, it may indicate that the transmission is malfunctioning.
Another sign of transmission trouble is overheating. If your drill becomes excessively hot during use, this can point to internal friction or damage within the transmission system. Additionally, irregular behavior like the drill not engaging or switching gears unexpectedly can also signify a need for transmission inspection and potential rebuilding.
How do I disassemble the DeWalt DCD790 Type 2 drill to access the transmission?
To begin disassembling your DeWalt DCD790 Type 2 drill, ensure it’s unplugged or the battery is removed for safety. You should start by removing the screws located on the drill’s housing, typically found near the handle and around the motor casing. Use a suitable screwdriver to carefully unscrew without stripping the heads. Once the screws are out, gently pry apart the housing to access the internal components.
Once the casing is open, you’ll need to disconnect the motor from the transmission. This involves carefully noting the wiring connections and removing any clips or additional screws holding the motor in place. With the motor detached, you can then access the transmission assembly for inspection and rebuilding, making sure to keep track of all parts and their orientation for easy reassembly later.
What tools and materials will I need for rebuilding the transmission?
Rebuilding the transmission of your DeWalt DCD790 Type 2 drill will require specific tools to carry out the task effectively. Essential tools include a set of screwdrivers (both Phillips and flathead), pliers, and a socket set for removing screws and nuts. A small hammer or rubber mallet can also be useful for gently dislodging stuck components without causing damage.
In addition to tools, you’ll need to gather materials such as replacement gears, bearings, and possibly sealed lubrication for the transmission. It’s also advisable to have a clean workspace with a magnetic tray to hold small screws and parts, along with a workbench for stability during the rebuilding process. Having everything organized will help streamline the rebuilding efforts and reduce the chance of losing parts.
How do I identify which parts need to be replaced in the transmission?
To identify which parts may need replacement during the transmission rebuild, first inspect each component for visible signs of wear and damage. Look for cracked or chipped gears, worn bearings, and any signs of excessive heat or discoloration on metal parts. These indicators can provide a clear indication of which elements have failed and need to be replaced.
Next, you should conduct a functionality test of the components if possible. For instance, turn the gears manually to check for smoothness; any grinding or resistance can signal a problem. Take note of any irregularities and compare them to the specifications in the manufacturer’s manual to establish which parts are substandard and must be swapped out to ensure reliable operation after reassembly.
Are there any specific techniques to ensure proper reassembly of the transmission?
When reassembling the transmission of your DeWalt DCD790 Type 2 drill, it’s crucial to follow a systematic approach to ensure that all components fit together correctly. Start by carefully laying out all parts in the order they were removed, as this will help you visualize how to reassemble them back into the transmission. Take your time, and refer back to any notes or pictures you may have taken during disassembly.
Furthermore, applying a small amount of lubricant to moving parts (where applicable) can enhance the operation of the transmission. Make sure to tighten screws and bolts to the manufacturer’s specifications to avoid over-torquing, which can cause damage. Additionally, double-check all connections, ensuring that no wires are pinched or exposed, and that all components are secured before closing up the housing.
What precautions should I take while working on the transmission?
Safety should be your top priority while working on the transmission of your DeWalt DCD790 Type 2 drill. Start by ensuring that the drill is entirely powered off, with the battery removed to prevent accidental activation. Wear safety goggles to protect your eyes from any small parts that may fly off during disassembly. Additionally, consider wearing gloves to protect your hands from sharp edges or other hazards.
Moreover, be mindful of workspace organization. Keep your tools and parts in a designated area to prevent any accidents or losing components. If you’re working with lubricants or adhesives, follow all safety guidelines on the packaging and use them in a well-ventilated area to avoid inhalation hazards or contamination. Finally, avoid rushing the process, taking your time to ensure that every step is conducted safely and correctly.
Where can I find replacement parts for the DeWalt DCD790 Type 2 drill transmission?
Replacement parts for the DeWalt DCD790 Type 2 drill transmission can be found at several sources. The first and most reliable source is through DeWalt’s official website or authorized service centers, where you can purchase genuine parts that ensure compatibility and quality. They often have a dedicated section for replacement parts, making it easier to find what you need.
Additionally, various online retailers and marketplaces, such as Amazon, eBay, or specialized power tool parts websites, can offer a wide selection of components for your drill model. When purchasing from these sources, it’s essential to check reviews and ensure that you are acquiring parts that are compatible with your specific drill model. Always compare prices and verify the quality to ensure the long-term performance of your tool after the rebuild.