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| Troubleshooting |
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Problem | Cause | Solution |
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Unit pumps but output flow is | Clogged inlet suction screen | Clean or replace. |
low. | (used oil). |
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| Air leak in suction tube. | Check to make sure all joints in |
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| suction tube are sealed. |
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| Suction tube too close to tank | Suction tube must have a 2 in. |
| bottom. | (51 mm) minimum clearance. |
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| Tank empty. | Refill tank. |
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| Tank not vented. | Tank must be vented to atmo- |
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| sphere. |
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| Worn or damaged gears. | Remove cover and inspect |
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| gears. Replace if worn or dam- |
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| aged. |
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| Damaged motor. | Replace motor. |
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| Clogged suction tube, hose, or | Inspect and clean. |
| nozzle. |
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Motor stalls when nozzle is | Bypass relief valve is stuck. | Inspect relief valve, making |
closed. |
| sure ball is free. Replace if |
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| damaged. |
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| Low supply voltage. | Check supply voltage. |
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| Gears damaged and binding. | Inspect gears. Gears should |
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| turn freely. Replace if dam- |
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| aged. |
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| Faulty motor. | Replace motor. |
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Motor overheating. | Gears binding. | Check to make sure gears turn |
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| freely on shaft. |
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| Operating pump extended time | Do not exceed 5 minutes of |
| with nozzle closed. | operation with nozzle closed. |
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| Clogged inlet suction screen. | Clean or replace. |
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| Clogged suction tube, hose, or | Inspect and clean if required. |
| nozzle. |
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| Operating pump more than 30 | Limit operation to 30 minutes |
| minutes continuous duty. | per hour. |
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Switch will not turn pump on. | Blown fuse or circuit breaker. | Check electrical supply. |
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| Electrical problem. | Check that supply voltage is |
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| proper and getting to pump. |
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| Defective switch. | Check and replace motor (9) if |
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| defective. |
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| Damaged or defective motor. | Check motor, replace if dam- |
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| aged or defective. |
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311305E | 7 |
