The DEWALT DWE402 4-1/2" Small Angle Grinder is a cornerstone of any high-performance workshop, delivering a potent 11-Amp motor and 11,000 RPM for demanding metalworking tasks. Much like a high-end espresso machine, its longevity and "extraction" of power depend on proactive maintenance and an understanding of its mechanical nuances. While the integrated Dust Ejection System significantly extends motor life by diverting debris, high-torque applications inevitably lead to wear on specific high-tolerance components. To maintain peak performance and safety, operators should regularly inspect the tool’s internal assembly.

Common Repair Issues

• Carbon Brushes: These are the most frequent replacements. Once worn past the wear line, the motor will lose power or fail to initiate.
• Trigger Switch: The paddle switch mechanism can accumulate micro-fine metallic dust, leading to intermittent connectivity or mechanical sticking.
• Power Cord: Frequent movement and tight storage often cause internal wire fatigue, typically at the strain relief point.
• Armature and Bearings: Excessive heat from overloading can scorch the armature or dry out the grease in the bearings, resulting in increased vibration and grinding noises.