TM 55-2210-223-12
TO 45A2-2-14-41
Table 4-2. UNIT TROUBLESHOOTING (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL INSTRUMENTS AND CONTROLS
3.
FAULTY OPERATION OF ELECTRICAL CONTACTORS
WARNING
· 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.
Step 1.
Check to see if there is an air gap.
If there is an air gap, notify intermediate direct support
maintenance.
Step 2.
Check to see if the closing voltage is below 64 V.
If below 64 V, notify intermediate direct support maintenance.
Step 3.
Check to see if bearings are binding.
Clean and lubricate as required.
Step 4.
Check to see if there is dirt or other foreign matter between
contacts.
Clean as required.
4.
FAULTY OPERATION OF INTERLOCKS OR CONTROL FINGERS
Check to see if interlocks or finger surfaces are dirty or gummy.
Clean and lubricate interlocks and fingers as required.
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