
ST-3050D SUBMERSIBLE PUMP —TROUBLESHOOTING
TABLE X. PUMP TROUBLESHOOTING
SYMPTOM | POSSIBLE PROBLEM | SOLUTION | |
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| Check that proper voltage (230/460 3Ø) is being supplied to the | |
| Incorrect voltage/amps? | pump. Also check that there is an adequate amount of current | |
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| (amps) to run the pump. Check power source circuit breaker. | |
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| Check electrical connections? | If using float switches check wiring, inspect power cord. | |
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| Blown power fuse? | Replace fuse, check cause of blown fuse. | |
Pump Fails To Start |
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Impeller locked? | Disconnect power cord and check for clogging and improper impeller | ||
| clearance. Unclog pump. Check overload protection device. | ||
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| Use multimeter to check motor insulation. Insulation resistance must | |
| Wet motor windings? | be approximately 15 megaohms. If resistance is low, disassemble | |
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| pump motor and bake windings to dry them. | |
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| Defective motor and pump | Check for excessive bearing wear, if worn replace bearings. Replace | |
| bearings? | motor if defective. | |
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| Twisted or restricted discharge | Lay hose flat | |
| hose? |
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| Clogged pump strainer? | Clean strainer. | |
Pump Fails to Deliver Full |
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| Use a voltmeter to check voltage while pump is energized. Voltage | ||
Output |
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Low voltage? | must be within ±10%. Check power source (no load and load). If an | ||
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| extension cord is used, make sure it has adequate | ||
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| capacity for the required length. | |
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| Impeller worn? | Replace impeller. | |
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Water in Seal Oil | Defective water seal? | Replace water seal. | |
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Loose Oil Fill Plug? | Tighten securely. | ||
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Performance Curve
| (Feet) | 90 |
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| Head |
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| TOTAL HEAD | |
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| Total |
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| Max 86 ft |
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| CAPACITY | |
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Figure 20. |
| 60 |
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| Max 264 G.P.M |
Performance Chart |
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| 30 |
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| 0 | 100 | 200 | 300 | Capacity(US.G.P.M) |
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