Goulds Pumps 4550 - IOM - Manual (Page 29)

TROUBLESHOOTING
1. Priming - Liquid level in sump not equal to or greater
than minimum submergence.
2. Speed too low - check whether motor wiring is
correct and receives full voltage.
3. System discharge head too high - check system head,
particularly friction losses.
4. Suction lift too high - check sump level.
5. Impeller or piping obstructed - check for
obstructions.
6. Wrong direction of rotation - check rotation.
7. Air pocket in casing increasing - increase level in
sump.
8. Float controls operating incorrectly - check
operation.
9. Entrained air or gases in liquid - consult factory.
10. Impeller clearance too great - check for proper
clearance.
11. Impeller damaged - inspect and replace as required.
12. Rotating parts bind - check internal wearing parts for
proper clearances.
13. Shaft bent - straighten or replace as required.
14. Coupling or pump and driver misaligned - check
alignment and realign if required.
15. Impeller diameter too small - consult factory for
proper impeller diameter.
16. Improper pressure gauge location - check correct
position and discharge nozzle or pipe.
17. Pump cover O-ring damaged - check O-ring and
replace as required.
18. Speed too high - check motor winding voltage.
19. Head lower than rating; pumps too much liquid
-consult factory. Install throttle valve, cut impeller.
20. Liquid heavier than anticipated - check specific
gravity and viscosity.
21. Cavitation - Consult factory. Increase NPSH
available.
22. Bearings worn out - inspect and replace as required.
Assure bearings have proper lubrication.
4550 IOM 5/08
25
6
Problem Possible Causes & Corrections
No liquid delivered, not enough liquid delivered or not enough pressure 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 15, 16, 17
Pump works a while and then quits 4, 5, 7, 8, 9, 17
Pump takes too much power 6, 10, 11, 12, 13, 14, 18, 19, 20, 22
Pump is noisy or vibrates 4, 12, 13, 14, 21, 22