Why should excessive solvent not be used when cleaning a motor?

Using excessive solvent when cleaning a motor can damage the insulation, which is a crucial component of the motor's operation. The insulation is designed to protect the windings from short circuits and to withstand the thermal and electrical stresses encountered in the motor's operation. When solvents are used in excessive amounts, they can break down the insulation materials, lead to moisture ingress, or cause chemical reactions that degrade the insulation's integrity. This can ultimately result in electrical failures or reduced operational lifespan of the motor.

While leaving a residue or increased cost might be factors considered in the cleaning process, the primary concern in the context of motor maintenance is ensuring the longevity and functionality of the insulation. Reducing efficiency is also a possible consequence of poor insulation, but the direct impact of excessive solvent on insulation damage is the critical reason to restrict solvent use.