Table 3-1. Intermediate Direct Support Troubleshooting

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Section III. INTERMEDIATE DIRECT SUPPORT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)

TM-55-1905-223-24-12 Fire Pump System for Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

Section V. INTERMEDIATE DIRECT SUPPORT MAINTENANCE PROCEDURES

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).

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