HP 8-UB-1 User Manual download pdf (Page 28)

UB USER INSTRUCTIONS ENGLISH 71569247 07-04

Page 28 of 32

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

Impeller damaged or eroded. Replace impeller and check reason.

Leakage under sleeve due to joint failure. Replace joint and check for damage.

Mechanical seal improperly installed.

Check alignment of faces or damaged parts and

assembly method used.

Incorrect type of mechanical seal for operating

conditions.

Consult Flowserve

Shaft running off centre because of worn

bearings or misalignment.

Check misalignment and correct if necessary.

If alignment satisfactory check bearings for

excessive wear.

Impeller out of balance resulting in vibration. Check and consult Flowserve.

Abrasive solids in liquid pumped. Check and consult Flowserve.

Mechanical seal was run dry.

Check mechanical seal condition and source of

dry running and repair.

Internal misalignment due to improper repairs

causing impeller to rub.

Check method of assembly, possible damage or

state of cleanliness during assembly.

Excessive thrust caused by a mechanical failure

inside the pump.

Check wear condition of impeller, its clearances

and liquid passages.

Excessive grease in ball bearings. Check method of regreasing.

Lack of lubrication for bearings.

Check hours run since last change of lubricant,

the schedule and its basis.

Improper installation of bearings.

Check method of assembly, possible damage or

state of cleanliness during assembly and type of

bearing used.

Damaged bearings due to contamination.

Check contamination source and replace

damaged bearings.

C. ELECTRICAL TROUBLES

Wrong direction of rotation. Reverse 2 phases on motor terminal box.

Motor running too slow. Check motor terminal box connections.

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HP 8-UB-1 User Manual Page 28

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