SECTION IV. UNIT TROUBLESHOOTING - TM-55-1905-223-24-130015

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Table 2-1. Unit Preventive Maintenance Checks and Services (PMCS)

TM-55-1905-223-24-13 Bilge/Ballast Pump Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

Table 2-2. Troubleshooting - CONT

TM 55-1905-223-24-13

SECTION IV. UNIT TROUBLESHOOTING

2-10. Troubleshooting. Both a symptom index and a troubleshooting table are provided. The symptom index will

help you locate the information you need for troubleshooting.

SYMPTOM INDEX

Troubleshooting

Procedure

(Table 2-2)

LIQUID NOT BEING PUMPED AND DELIVERED

Item 1

NOT ENOUGH PRESSURE

Item 2

PUMP OPERATES FOR SHORT TIME THEN STOPS

Item 3

PUMP DRAWS TOO MUCH AMPERAGE

Item 4

PUMP NOISY OR VIBRATES

Item 5

Table 2-2 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 2-2. Troubleshooting

Malfunction

Test or Inspection

Corrective Action

Liquid not being pumped.

STEP 1.

Check for loss of prime.

Fill pump and suction pipe completely with liquid.

Correct leaks in suction pipe joints and fittings.

Vent casing to remove accumulated air.

STEP 2.

Check to see if suction lift is too high.

Remove obstructions from inlet (Item 3, PMCS).

STEP 3.

Check to see if discharge head too high.

Open valves in discharge piping.

STEP 4.

Check for low motor speed.

Make sure motor is directly across-the-line and receiving full voltage

and frequency.

STEP 5.

Check to see if motor is rotating in the right direction.

Inspect wiring for proper connections.

2-4