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 TM 55-1905-223-24-11
Table 2-2. Troubleshooting - CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11. A centrifugal pump motor runs/turns but fails to operate (discharge, flow, or sludge).
STEP 1.
Check to see if pump is clogged. Remove pump and clean (paragraph 2-20, 2-21, or
2-22).
STEP 2.
Check to see if impeller is loose on shaft.
Replace the faulty centrifugal pump
12. A centrifugal pump operates but is noisy or vibrates excessively (discharge, flow, or sludge).
STEP 1.
Check for loose mountings. Tighten mounting hardware (paragraphs 2-20, 2-21, or 2-
22).
STEP 2.
Check for broken or damaged impeller.
Replace the faulty centrifugal pump
STEP 3.
Check for internal rubbing of motor of defective bearings.
Replace pump system
STEP 4.
Check to see if motor shaft is bent. Replace pump assembly (paragraph 2-20, 2-21, or
2-22).
13. Sewage leakage from a pump, disposer, or a piping connection.
STEP 1.
Check for loose bolts, nuts, plugs, or fittings. Tighten bolts, nuts, clamps, plus, or
fittings as necessary.
STEP 2.
Check for faulty centrifugal pump. Replace the faulty centrifugal pump (paragraph 2-
20, 2-21, or 2-22).
14. Motor energized but pump shaft fails to turn (centrifugal pumps).
STEP 1.
Check for defective motor bearings causing motor binding. Replace pump system
STEP 2.
Check to see if impeller is jammed or binding in housing. replace the centrifugal pump
15. Waste disposer operates noisy or vibrates excessively.
STEP 1.
Check for loose mountings. Tighten mounting hardware (paragraph 2-23).
2-17
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