Using the motor to "hold" a vehicle motionless on a hill (or against
some immobile load) is a sure way to roast the brushes and the
commutator. A DC motor needs to spin, just a bit, to distribute the load
evenly around the commutator bars and armature windings.
Also, you really need to break in a motor under light load for quite
some time before giving it maximum amps. I spin the motors using ~12
volts for about a week to break in the brushes.
Bill Dube'
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