Flowserve Worthington WXB User Manual download pdf (Page 47)

WXB USER INSTRUCTIONS ENGLISH - 07/14

Page 47 of 51

FAULT SYMPTOM

Pump overheats and seizes

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Bearings have short life

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Pump vibrates or is noisy

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Mechanical seal has short life

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Mechanical seal leaks excessively

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Pump requires excessive power

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Pump loses prime after starting

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Insufficient pressure developed

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Insufficient capacity delivered

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Pump does not deliver liquid

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PROBABLE CAUSES

POSSIBLE REMEDIES

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Incorrect type of mechanical seal for operating

conditions.

Consult Flowserve

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Shaft running off centre because of worn

bearings or misalignment.

Check misalignment and correct if necessary.

If alignment satisfactotry check bearings for

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 dry running and repair

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Internal misalignment due to improper repairs

causing impeller to rub.

Check method of assembly, possible damage

or state of cleanliness during assembly

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Excessive thrust caused by a mechanical

failure inside the pump.

Check wear condition of Impeller, its

clearances 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, the schedule and its basis

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Improper installation of bearings

Check method of assembly, possible damage

or state of cleanliness during assembly and

type of bearing used

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Damaged bearings due to contamination.

Check contamination source and replace

damaged bearings

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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Flowserve Worthington WXB User Manual Page 47

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