Table 4-2. Unit Troubleshooting (continued)
TEST OR INSPECTION
ELECTRICAL INSTRUMENTS AND CONTROLS
3. FAULTY OPERATION OF ELECTRICAL CONTACTORS.
· Remove rings, bracelets, wristwatches, and neck chains before working around the locomotive.
Jewelry can catch on equipment and cause injury, or may short across an electrical circuit and
cause severe burns or electrical shock.
· Be careful not to short out battery terminals. Do not smoke or use open flame near batteries.
Batteries may explode from a spark. Battery acid is harmful to skin and eyes.
Check for an air gap.
If there is an air gap, notify intermediate direct support maintenance.
Check for closing voltage below 32 V.
If below 32 V, notify intermediate direct support maintenance.
Check for binding bearings.
Clean and lubricate as required.
Check for dirt or other foreign matter between contacts.
Clean as required.
4. FAULTY OPERATION OF INTERLOCKS OR CONTROL FINGERS.
Check for dirty or gummy interlocks or finger surfaces.
Clean and lubricate interlocks and fingers as required.