Goulds Pumps NM3171 - IOM - Manual (Page 27)

TROUBLESHOOTING
CAUSES AND CORRECTIVE MEASURES . . . . . . . . . . . . . . . . . . 21
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.
NM 3171 IOM 5/08
21
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