The Singer Carbon Motor Brush (part # 190782) is a critical electrical component used to conduct current to the rotating commutator of the motors found in many vintage Singer sewing machines. These brushes are a standard "wear item" and must be replaced once they reach approximately 1/4 inch (6mm) in length to maintain motor performance and prevent electrical damage. This listing includes a set of two (2) carbon motor brushes without springs.

Specifications:

• Part Number: 190782
• Type: Replacement (aftermarket)
• Quantity: Set of 2 brushes
• Size: 4mm x 4mm x 15mm
• Configuration: No springs (brushes only)
• Function: Conducts electrical current to motor commutator
• Replacement Interval: When brushes reach approximately 1/4 inch (6mm) in length

Machine Compatibility:

Fits Singer models: 15, 28, 66, 99, 128, 206, 301, 301A, 306, 319 (with BT, BR, BZ, BU, or BA series motors)

Compatible Motors:

Fits BT, BR, BZ, BU, and BA series motors (including BU 7-E, BU 7-A, and BR 7)

Function & Benefits:

Carbon motor brushes are essential for transferring electrical current from the stationary motor housing to the rotating commutator, enabling the motor to run. As wear items, they gradually wear down through friction during normal operation. Regular inspection and timely replacement of worn brushes ensures consistent motor performance, prevents sparking and electrical arcing, and protects the motor commutator from damage. Replace brushes when they reach approximately 1/4 inch (6mm) in length or if you notice reduced motor power, excessive sparking, or intermittent operation.

Installation Tip:

For optimal performance, the concave surface of the brush must be aligned with the shape of the motor's commutator during installation. Ensure brushes are properly seated in the brush holders and make good contact with the commutator surface for reliable electrical conductivity and smooth motor operation.