Here’s a short and simple maintenance schedule for the DeWalt Angle Grinder DWE402:

### Daily Maintenance
1. **Visual Inspection**: Check for any damage or wear on the grinder and the power cord.
2. **Clean the Tool**: Remove dust and debris from the housing and cooling vents with a soft brush or cloth.
3. **Check the Guard**: Ensure the guard is in place and properly positioned.

### Weekly Maintenance
1. **Inspect Brushes**: Check the carbon brushes for wear and replace if they are less than 1/4 inch long.
2. **Tighten Bolts**: Ensure all screws and bolts are tight.

### Monthly Maintenance
1. **Lubricate Gears**: If applicable, apply a few drops of light machine oil to any moving parts as per the owner’s manual.
2. **Check the Disc**: Inspect the grinding disc for wear and replace if necessary.

### As Needed
1. **Replace Worn Parts**: Replace worn or damaged components immediately to prevent further damage.
2. **Professional Service**: Consider a professional service if the grinder is used heavily or showing signs of significant wear.

Following this maintenance schedule will help ensure your DeWalt Angle Grinder operates efficiently and lasts longer.

Here’s a product specification sheet for the DeWalt DWE402 Angle Grinder:

### DeWalt DWE402 Angle Grinder Specification Sheet

**Model:** DWE402
**Type:** Angle Grinder

#### General Specifications:
– **Power Input:** 11 Amps
– **Voltage:** 120V
– **No-load RPM:** 11,000
– **Wheel Diameter:** 4-1/2 inches
– **Spindle Size:** 5/8-inch-11
– **Weight:** 6.2 lbs

#### Features:
– **Powerful Motor:** 11,000 RPM for high-speed grinding and cutting.
– **Durable Design:** Cast metal gear housing for increased durability and reliability.
– **Safety Features:**
– Quick-release switch for easy shutdown.
– E-Clutch system reduces kickback if the wheel jams.
– **Adjustable Guard:** Tool-free guard adjustment allows for easy repositioning.
– **Spindle Lock:** Provides easy wheel changes.
– **Overload Protection:** Prevents motor damage in tough applications.

#### Applications:
– Metal grinding
– Cutting metal
– Surface preparation

#### Accessories:
– Spin-on auxiliary handle
– Guard
– Wrench

#### Warranty:
– 3-Year Limited Warranty
– 1-Year Free Service Contract
– 90-Day Money Back Guarantee

### Dimensions:
– **Length:** 12.25 inches
– **Height:** 4.5 inches

This angle grinder is an excellent choice for professionals and DIY enthusiasts, offering power, performance, and safety for various grinding and cutting applications. Always refer to the user manual for detailed operating instructions and safety guidelines.

For the DeWalt Angle Grinder DWE402, here is a common parts list along with their part numbers:

1. **Brush Set** – Part Number: 391200-00
2. **Switch** – Part Number: 650790-00
3. **Spindle Lock** – Part Number: 343983-00
4. **Gear Case** – Part Number: 330199-00
5. **Armature** – Part Number: 393890-00
6. **Field** – Part Number: 393891-00
7. **Housing** – Part Number: 330198-00
8. **Clamping Nut** – Part Number: 396369-00
9. **Flange** – Part Number: 396368-00
10. **Grinding Wheel** – Part Number: varies based on the type and size

These part numbers may vary or be updated, so it’s always a good idea to verify with a local dealer or DeWalt’s official parts website for the most accurate and up-to-date information.
Download the Parts List

Troubleshooting a DeWalt Angle Grinder DWE402 involves a systematic approach to identify and resolve common issues. Here’s a step-by-step guide:

### 1. **Safety First**
– Ensure the grinder is unplugged before performing any checks.
– Wear appropriate personal protective equipment (PPE) such as safety glasses and gloves.

### 2. **Check Power Supply**
– **Electrical Outlet**: Make sure the outlet is functioning. Plug in another device to verify.
– **Power Cord**: Inspect the power cord for any visible damage or fraying. If damaged, it needs replacement.

### 3. **Examine the Switch**
– **Functionality**: Test the switch by trying to turn the grinder on and off. If it feels stuck or unresponsive, it may be faulty.
– **Continuity Test**: Use a multimeter to check for continuity when the switch is pressed. If there’s no continuity, the switch may need replacing.

### 4. **Inspect the Brush Assembly**
– **Carbon Brushes**: Remove the brush caps and check the carbon brushes for wear. If they are worn down to the limit (usually around 1/4 inch), replace them.
– **Free Movement**: Ensure the brushes move freely in their holders and make good contact with the commutator.

### 5. **Check the Motor**
– **Burnt Smell or Heat**: If the motor smells burnt or feels excessively hot, it may be damaged.
– **Spin Test**: Manually spin the motor shaft to check for any binding or resistance, which may indicate internal damage.

### 6. **Examine the Gear Housing**
– **Noise During Operation**: Any unusual grinding or clunking noises may indicate a problem with the gears.
– **Wear and Tear**: Inspect for any visible signs of wear or damage.

### 7. **Verify the Disc/Accessory**
– **Correct Attachment**: Make sure the disc or accessory is properly attached and not loose.
– **Size and Type**: Ensure that the disc is appropriate for the grinder and the task at hand.

### 8. **Look for Overheating Issues**
– **Ventilation**: Ensure that the vents are not blocked; clean any debris that may obstruct airflow.
– **Duty Cycle**: If using the grinder for extended periods, ensure you’re adhering to the recommended duty cycle to prevent overheating.

### 9. **Test the Grinder**
– After checking all components, plug the grinder back in and test it. If it still doesn’t work:
– Reassess the components and ensure everything is reassembled correctly.
– Consider consulting a professional technician for complex internal issues.

### 10. **Refer to the Manual**
– If issues persist, consult the user manual for specific troubleshooting tips and potential repair options.

By following these steps, you should be able to identify and possibly resolve the problem with your DeWalt Angle Grinder DWE402. If issues continue, it may be time to seek professional repair services.