The MILWAUKEE 40-50-2170 is a right-hand brush spring designed as a direct OEM replacement component for compatible Milwaukee power tools. Brush springs maintain consistent contact pressure between carbon brushes and the motor commutator, ensuring reliable current transfer and stable motor performance. When a brush spring loses tension or breaks, motor performance degrades and brush wear accelerates. This part is installed by electricians, tool repair technicians, and experienced tradespeople performing motor maintenance or brush replacement service.
This brush spring is suited for motor maintenance applications where the original right-side spring has worn, fatigued, or broken. It is used during carbon brush service intervals on compatible Milwaukee power tools and is designed to restore OEM contact pressure and performance. Proper spring tension is critical to even brush wear and long commutator life.
Designed as an OEM-style replacement brush spring for compatible Milwaukee power tool motors. No specific model compatibility data was provided in the product listing.
Tool repair technicians and qualified electricians typically perform brush spring replacement. Disconnect and unplug the power tool completely before opening the brush cap or motor housing. When installing, ensure the spring is seated correctly in the right-side brush holder before reassembling the housing. Consult the tool service manual for brush access procedures specific to the unit being serviced.