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 TM 55-1905-223-24-12
Malfunction
Test or Inspection
Corrective Action
CENTRIFUGAL PUMP UNIT - CONT
2. Not enough liquid delivered.
STEP 1. Check to see if impeller is partially plugged.
Disassemble pump and clean impeller (para. 4-15).
STEP 2. Check for defective impeller.
Disassemble pump and replace impeller (para. 4-15).
STEP 3. Check for defective mechanical seal.
Disassemble pump and replace mechanical seal and sleeves (para. 4-15).
3. Low pump discharge pressure.
STEP 1. Check for obstruction in liquid passages.
Disassemble pump (para. 4-15) and inspect passages of impeller and
casing. Remove obstruction.
4. Pump draws excessive amperage.
STEP 1. Check for defective mechanical seal.
Disassemble pump and replace mechanical seal and sleeves (para. 4-15).
STEP 2. Check for distorted pump casing.
Disassemble pump and replace all defective parts (para. 4-15).
STEP 3. Check for bearing failure.
Disassemble alternating current motor and replace bearings (para. 4-14).
STEP 4. Check for defective impeller.
Disassemble pump and replace impeller (para. 4-15).
AUXILIARY FIRE PUMP
5.
Liquid not being pumped.
STEP 1. Check for air leaks between shaft and shaft sleeve
Disassemble pump and replace shaft sleeve with 0-ring (para. 4-12).
STEP 2. Check for restricted impeller cavity.
Disassemble pump and clean impeller and cavity (para. 4-12).
STEP 3. Check for damaged impeller.
Disassemble pump and replace impeller (para. 4-12).
4-4
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