WDX USER INSTRUCTIONS ENGLISH 71576322 06-05
Page 39 of 46
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FAULT SYMPTOM
Pu mp o v erh eat s an d s eiz e s
B earin g s h av e sh o rt l if e
Pu m p v ib rat es o r is n o i s y
M ech an ic al se al h a s sh o r t lif e
M ech an ic al se al l ea ks ex ce ssiv el y
Pu mp req u ir es ex ces siv e p o wer
Pu mp lo se s p rim e af t er st ar t in g
In su f f icien t p r e ssu r e d ev elo p ed
In su f f icien t c ap ac it y d el iv er ed
Pu mp d o es n o t d e liv er liq u id
PROBABLE C AUSES
POSSIBLE REMEDIES
Rotating part rubbing on stationary part inter nall y.
Chec k and CON SULT F LOWSERVE, if necess ar y.
Bearings worn.
Replace bearings.
Wearing ring surfac es worn.
Replace worn wear ring/surfaces .
Impeller damaged or eroded.
Replace or CONSU LT FLOWSERVE for improved
material selec tion.
Leakage under sleeve due to j oint failure.
Replace joint and chec k for damage.
Shaft sleeve worn or scor ed or running off c entre.
Chec k and r enew defecti ve parts.
Mechanic al seal impr operl y installed.
Chec k alignment of fac es or damaged parts and
assembl y method us ed.
Incorrect type of mechanical s eal for operati ng
conditi ons.
CONSULT FLOWSERVE.
Shaft running off centre because of worn bearings
or misalignment.
Chec k misalignment and correct if necess ar y. If
alignment satisfactory chec k bearings for excessi ve
wear.
Impeller out of balanc e res ulting in vibration.
Abrasi ve s olids in liquid pumped.
Internal misalignment of parts preventing seal ring
and seat from mati ng properl y.
Chec k and CON SULT F LOWSERVE.
Mechanic al seal was run dr y.
Chec k mechanic al seal c ondition and s ource of dr y
running and r epair.
Internal misalignment due to improper repairs
causing impeller to rub.
Chec k method of ass embl y, possibl e damage or
state of cl eanliness during ass embl y.
Remedy or CONSU LT FLOWSERVE, if necess ar y.
Exc essi ve thrust c aus ed by a mechanic al failure
inside the pump.
Chec k wear condition of impeller, its clear ances and
liquid passages.
Exc essi ve greas e in ball bearings.
Chec k method of regreasing.
Lac k of lubrication for bearings.
Chec k hours run sinc e last c hange of lubricant, the
schedule and its basis.
Improper ins tallation of bearings (damage during
assembl y, incorrect assembl y, wrong type of
bearing etc).
Chec k method of ass embl y, possibl e damage or
state of cl eanliness during ass embly and type of
bearing us ed. Remedy or CONSU LT FLOWSERVE,
if nec essar y.
Damaged bearings due to c ontami nati on.
Chec k contamination source and replac e damaged
bearings.
C. MOTOR ELECTRICAL PROBLEMS
Wrong direction of rotation.
Reverse 2 phases at motor terminal box.
Motor running on 2 phases onl y.
Chec k suppl y and fus es.
Motor running too slow.
Chec k motor ter minal box c onnecti ons and voltage.
