Lesson 2
LESSON 2
CRANKING SYSTEMS
TASK
Describe the application of the fundamentals of electricity to starting system components.
CONDITIONS
Given information on the principles, operation, and construction of cranking motors and starter
drives.
STANDARDS
Answer 70 percent of the multiple-choice test items covering cranking systems.
REFERENCES
TM 9-8000
Learning Event 1:
DESCRIBE THE PRINCIPLES, CONSTRUCTION, AND OPERATION OF CRANKING
MOTORS AND STARTER DRIVES
INTRODUCTION
The automotive electrical system includes a starter motor which has replaced the hand crank used
to start cars in bygone days. The purpose of the starter (also called cranking) motor is to rotate the
engine crankshaft so the engine can start and begin to operate under its own power. The starter
motor is a lowresistance, direct current motor producing a high torque. It draws the current directly
from the battery.
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