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 TM 55-1905-223-24-18-1
Table 2-2.
Troubleshooting - CONT
Malfunction
Test or Inspection
Corrective Action
CENTRIFUGAL PUMP UNIT (FRESH WATER BOOSTER) AND
(REDUCTION GEAR COOLING WATER) - CONT
STEP 4. Check for defective motor.
Replace motor, para. 2-97.
60. Noisy pump/motor operation.
STEP 1. Check for air or gas in liquid.
Identify source and correct problem.
STEP 2. Check for liquid vortexing (cavitation) in casing.
Release trapped air from pump casing.
STEP 3. Check for dry bearings.
Grease pump/motor bearing(s) (Lo 55-1905-223-12).
STEP 4. Check for loose or broken mounting bracket and bolts.
Tighten loose mounting bracket. Replace bracket/bolts.
STEP 5. Check for damaged pump/motor.
Replace pump/motor, para. 2-97.
CENTRIFUGAL PUMP UNIT (AUXILIARY SEAWATER COOLING) - CONT
61. Low discharge pressure.
STEP 1. Check for liquid vortexing (cavitation) in casing.
Release trapped air from pump casing.
STEP 2. Check for air or gas in liquid.
Identify source and correct problem.
Check for marine growth or other foreign matter buildup on sea chest
STEP 3.
inlet.
Back flush sea chest using ship's compressed air system.
STEP 4. Check for partially closed seawater supply valve.
Ensure seawater supply valve fully open.
STEP 5. Check for dirty or restricted duplex strainer.
Clean duplex strainer (TM 55-1905-223-24-1818).
STEP 6. Check for partially closed pump suction valve.
Ensure pump suction valve fully open.
2-126
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