SHROUD 9N3701 - Caterpillar

If the starting motor fails, the engine may not start in an emergency situation. A scheduled inspection of the starting motor is recommended.The starting motor pinion and the flywheel ring gear must be in good condition in order for the engine to start properly. The engine will not start if the starting motor pinion does not engage the flywheel ring gear. The teeth of the starting motor pinion and the flywheel ring gear can be damaged because of irregular engagement.Inspect the starting motor for proper operation. Listen for grinding when the engine is started. Inspect the teeth of the starting motor pinion and the flywheel ring gear. Look for patterns of wear on the teeth. Look for teeth that are broken or chipped. If damaged teeth are found, the starting motor pinion and the flywheel ring gear must be replaced.Electric Starting Motor
Note: Problems with the electric starting motor can be caused by the following conditions: malfunction of the solenoid and malfunction of the electric starting system.Inspect the electrical system for the following conditions:
Loose connections
Corrosion
Wires that are worn or frayed
CleanlinessMake repairs, if necessary.Removal and Installation of the Starting Motor
Refer to the Service Manual, "Disassembly and Assembly" module for information on removing the starting motor and installing the starting motor.Consult your Caterpillar dealer for assistance.