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Troubleshooting Guide - STA-RITE 60 CYCLE C Series Owner's Manual

60 cycle “c” and “cc” series centrifugal pumps for swimming pool use
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Read symptom describing problem below at left. Causes for problems (bottom) are keyed to numbers at right. Check pump
for causes listed at right and correct those that apply.
Hazardous voltage. Can shock, burn or kill.
SYMPTOM
Pump does not deliver liquid
Pump delivers too little flow
Delivery pressure too low
Pump needs too much power
Seal leaks
Pump vibrates or is noisy
Motor bearings have short life
Pump overheats and/or seizes
CAUSES
1. Pump not primed.
2. Pump or suction pipe not completely full of liquid
3. Suction lift rather than positive head installation.
4. Pump cavitating; increase suction pressure.
5. Excessive amount of air or gas in liquid.
6. Suction pipe inlet not sufficiently submerged.
7. Impeller, suction or strainer partially or
completely plugged.
8. Speed too low.
9. Voltage wrong or too low.
10. Wrong direction of rotation.
11. System head too high for pump design.
12. System head too low for pump design.
13. Specific gravity of liquid different than design.
14. Viscosity of liquid different than design.
15. Pump operating at very low capacity.

TROUBLESHOOTING GUIDE

KEY NUMBERS FOR CAUSES
1, 2, 3, 4, 6, 8, 10, 11, 14, 15, 16, 17
2, 3, 4, 5, 6, 7, 8, 9, 11, 14, 16, 17, 23, 24
5, 8, 9, 10, 11, 14, 16, 23, 24
9, 10, 11, 12, 13, 14, 17, 18, 20,21, 23
18, 20, 25, 26
2, 3, 4, 6, 7, 15, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27,
28, 29, 30
18, 20, 21, 22, 25, 26, 27, 28, 29, 30
1, 4, 15, 16, 18, 21, 22, 25, 26
16. Parallel operation of pumps unsuited for such operation.
17. Foreign matter in impeller.
18. Misalignment of pump or piping.
19. Foundations not rigid.
20. Shaft bent.
21. Rotating part rubbing on stationary part.
22. Bearings worn.
23. Wear ring worn.
24. Impeller damaged.
25. Shaft running off center due to worn bearings or
misalignment.
26. Impeller out of balance resulting in vibration.
27. Excessive grease in bearing causing high bearing temperature.
28. lack of lubrication.
29. Dirt in bearings.
30. Rust in bearings due to water getting into motor.
13

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