Table 3-1. Troubleshooting.
TEST OR INSPECTION
CENTRIFUGAL WATER PUMPS
1. REDUCED WATER FLOW, MOTOR RUNS NORMALLY.
Step 1. Check for clogged or damaged impeller or broken motor shaft. Remove fan cover and fan. Using
a strap wrench, turn rotor shaft If shaft is hard to turn, is loose, or is excessively noisy, refer to
applicable motor assembly.
Step 2. Check for leaks around pump casing.
Step 3. Check for leakage from back of pump.
Replace mechanical seal.
Inspect parts of mechanical seal for damage.
Replace entire mechanical seal if any part is damaged.
Step 5. Check for leaks from suction or discharge assemblies.
PUMP MOTOR (EXCEPT CHEMICAL FEED MOTOR)
1. CENTRIFUGAL PUMP MOTOR WILL NOT START OR OVERHEATS REPEATEDLY.
Step 1. Remove fan cover and fan. Using a strap wrench, turn the shaft. If shaft is hard to turn, is loose,
or is excessively noisy, disassemble and inspect pump motor assembly in accordance with
Step 2. Check motor case wiring for burned or broken wires. Use an ohmmeter to test for short circuits.
Forward damaged motor to next higher level of maintenance for repair.