When cleaning, _______ should be kept away from the commutator and brushes.

When cleaning, _______ should be kept away from the commutator and brushes.

• A. oil
• B. solvents
• C. water
• D. grease

Answer: (B)

Solvents must be kept away from the commutator and brushes because they can contaminate and damage the contact surfaces. Solvents can soften or dissolve the varnish, insulation, or binder in the brush material, and leave residues that form conductive or insulating films. This interference hinders clean, smooth contact, promotes arcing and pitting, and accelerates brush and commutator wear. If cleaning is needed, use dry methods or manufacturer-approved cleaners applied away from the live surfaces, and ensure everything dries completely before operation.

Solvents must be kept away from the commutator and brushes because they can contaminate and damage the contact surfaces. Solvents can soften or dissolve the varnish, insulation, or binder in the brush material, and leave residues that form conductive or insulating films. This interference hinders clean, smooth contact, promotes arcing and pitting, and accelerates brush and commutator wear. If cleaning is needed, use dry methods or manufacturer-approved cleaners applied away from the live surfaces, and ensure everything dries completely before operation.