Series 638 – Section 8.2 Battery Charging Alternator

Section 8.2
Battery Charging Alternator

The battery charging alternator provides a source of electrical current for maintaining the storage battery in a charged condition, and supplies sufficient current to carry any other electrical load requirements up to the rated capacity of the alternator.‪

The battery charging circuit consists of an alternator, a voltage regulator, a battery(s) and the connecting wiring. Refer to the appropriate manufacturer's service instructions for complete regulator and alternator servicing information.‪

Section 8.2.1
Removal of Alternator

Remove the alternator as follows:‪

With the exception of the ECM system, never attempt to service any engine electrical systems until the batteries have been disconnected. When working on the alternator, be careful not to come in contact with the exhaust manifold or turbocharger. These components may be hot.‪

1. Disconnect the cables at the batteries.
2. Tag each lead to ensure correct connection when the alternator is reinstalled.
3. Remove the alternator output cable.
4. Loosen the alternator mounting bolts.
5. Remove the drive belts.
6. While supporting the alternator, remove the alternator-to-bracket bolts to prevent it from falling.
7. Remove the alternator carefully to prevent damage.

Section 8.2.1.1
Inspection of Alternator

Refer to OEM guidelines for alternator inspection procedures.‪

Section 8.2.2
Installation of Alternator

Install alternator as follows:‪

1. Install the alternator bracket to the cylinder block with bolts.
2. Install the alternator to the bracket with mounting bolts.
3. Install alternator drive belts.
4. Adjust alternator belt tension to specifications.
5. Connect all tagged leads disconnected during removal.

   With the exception of the ECM system, never attempt to service any engine electrical systems until the batteries have been disconnected. When working on the alternator, be careful not to come in contact with the exhaust manifold or turbocharger. These components may be hot.‪

6. Connect battery leads.