Series 638 – Section 15.4 Starter Motor Operating – Engine Will Not Crank

Section 15.4
Starter Motor Operating - Engine Will Not Crank

To determine if an inoperative starter is causing the engine to crank slowly or not crank, perform the following steps:‪

1. Remove the starter. Refer to "8.3.1 Removal of Starter" .
2. Visually check the flywheel for broken or missing teeth.
   1. If the flywheel has broken or missing teeth, replace the component (refer to "15.4.2 Replacement of Faulty Flywheel" .) and proceed with step 3 of inspection.
   2. If the flywheel has no broken or missing teeth, check for an inoperative starter motor or starter solenoid. Refer to "15.5 Starter Motor or Starter Solenoid Inoperative" .
3. Visually check the starter motor for broken or missing teeth.
   1. If the starter motor has broken or missing teeth, replace the component (refer to "15.4.1 Replacement of Faulty Starter" .) and proceed with step 4 of inspection.
   2. If the starter has no broken or missing teeth, check for an inoperative starter motor or starter solenoid. Refer to "15.5 Starter Motor or Starter Solenoid Inoperative" .
4. Visually check the starter motor for a broken starting motor spring.
   1. If the starter motor spring is broken, replace the starter. Refer to "15.4.1 Replacement of Faulty Starter" .
   2. If the starter motor spring is not broken, check for an inoperative starter motor or starter solenoid. Refer to "15.5 Starter Motor or Starter Solenoid Inoperative" .

Section 15.4.1
Replacement of Faulty Starter

Replace the starter as follows:‪

1. Install a new starter motor. Refer to "8.3.2 Installation of Starter" .
2. Verify replacement. Refer to "15.4.2.1 Test of Engine with Replaced Components" .

Section 15.4.2
Replacement of Faulty Flywheel

Replace the flywheel as follows:‪

1. Remove the flywheel. Refer to "1.16.2 Removal of the Flywheel" .
2. Install a new flywheel. Refer to "1.16.3 Installation of Flywheel" .
3. Verify replacement replacement. Refer to "15.4.2.1 Test of Engine with Replaced Components" .

Section 15.4.2.1
Test of Engine with Replaced Components

Perform the following to determine if the replaced components resolved the fault:‪

1. Attempt to start and run the engine.
   1. If the engine failed to start and run, check for an inoperative starter motor or starter solenoid. Refer to "15.3 Starting Circuit Connections Loose or Corroded" .
   2. If the engine started and ran, no further troubleshooting is required.