UB USER INSTRUCTIONS ENGLISH 71569247
®
FAULT SYMPTOM
Pump overheats and seizes
⇓Bearings have short life
⇓ Pump vibrates or is nois y
⇓ Mechanical seal has short life
⇓ Mechanical seal leaks excessi vel y
⇓ Pump requires excessive power
⇓ Pump loses prime after starting
⇓ Insuffi cient pressure developed
⇓ Insuffi cient capaci t y delivered
⇓ Pump does not deliver liquid
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| ⇓ | PROBABLE CAUSES | POSSIBLE REMEDIES |
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| Impeller damaged or eroded. | Replace impeller and check reason. |
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| Leakage under sleeve due to joint failure. | Replace joint and check for damage. |
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| Mechanical seal improperly installed. | Check alignment of faces or damaged parts and |
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| assembly method used. | ||||
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| Incorrect type of mechanical seal for operating | Consult Flowserve |
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| conditions. | ||||
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| Shaft running off centre because of worn | Check misalignment and correct if necessary. |
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| If alignment satisfactory check bearings for | |||||||
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| bearings or misalignment. | |
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| excessive wear. | |
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| Impeller out of balance resulting in vibration. | Check and consult Flowserve. |
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| Abrasive solids in liquid pumped. | Check and consult Flowserve. |
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| Mechanical seal was run dry. | Check mechanical seal condition and source of |
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| dry running and repair. | |||
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z | z | z | z | z | z |
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| Internal misalignment due to improper repairs | Check method of assembly, possible damage or |
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| causing impeller to rub. | state of cleanliness during assembly. | ||||||
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| Excessive thrust caused by a mechanical failure | Check wear condition of impeller, its clearances |
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| inside the pump. | and liquid passages. | |||
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| Excessive grease in ball bearings. | Check method of regreasing. |
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| Lack of lubrication for bearings. | Check hours run since last change of lubricant, |
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| the schedule and its basis. | |||
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| Improper installation of bearings. | Check method of assembly, possible damage or |
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| state of cleanliness during assembly and type of | |||
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| bearing used. |
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| Damaged bearings due to contamination. | Check contamination source and replace |
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| damaged bearings. | |||
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| C. ELECTRICAL TROUBLES | |
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| Wrong direction of rotation. | Reverse 2 phases on motor terminal box. |
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| Motor running too slow. | Check motor terminal box connections. |
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Page 28 of 32