Quantcast Table 3-1. Intermediate Direct Support Troubleshooting

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TM 55-1905-223-24-12
Table 3-1 lists the common fault conditions that may be found during operation or
maintenance of the equipment. Look for causes and do corrective actions in the
order listed. This manual cannot list every symptom that may show up, and it
cannot list all the possible causes and corrective actions. If a symptom is not
listed, or if it keeps up after you have performed the corrective actions, notify
your supervisor.
Table 3-1. Intermediate Direct Support Troubleshooting
Malfunction
Test or Inspection
Corrective Action
CENTRIFUGAL PUMP UNIT
1. Not enough liquid delivered
STEP 1. Check for wrong direction of rotation.
Make certain that pump motor is properly wired. If not, refer to
STEP 2. Check for defective impeller or mechanical seal.
Replace pump unit (para. 3-14).
2. Pump draws excessive amperage.
STEP 1. Check for wrong direction of rotation.
Make certain that pump motor is properly wired. If not, refer to
STEP 2. Check for bent pump impeller shaft.
Replace pump unit (para. 3-14).
STEP 3. Check for pump bearing failure.
Replace pump unit (para. 3-14).
STEP 4. Check for motor bearing failure.
Replace alternating current motor (para. 3-16).
AUXILIARY FIRE PUMP
3. Liquid not being pumped.
STEP 1. Check to see if impeller passages are restricted.
Replace auxiliary fire pump assembly (para. 3-13).
STEP 2. Check for cracked or broken wear rings.
Replace auxiliary fire pump assembly (para. 3-13).
STEP 3. Check for damaged impeller.
Replace auxiliary fire pump assembly (para. 3-13).
3-3


 


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