Flowserve WDX - Manual (Page 39)

WDX USER INSTRUCTIONS ENGLISH 71576322 06-05
Page 39 of 46
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FAULT SYMPTOM
Pu m p o v er h eat s an d s ei z e s
  B earin g s h av e sh o rt l if e
  Pu mp v ib rat es o r is n o i s y
  M ech an ic al se al h a s sh o rt 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 art in g
  In su f f icien t p re ssu r e d ev elo p ed
  In su f f icien t c ap ac it y d el iv ered
  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 FLO WSERVE f or improved
mat erial selec tion.

Leakage under sleeve due to j oint failure. Replace joint and chec k f or damage.
 
Shaf t sleeve worn or scor ed or running off c entre. Chec k and r enew defecti ve parts.
   Mechanic al seal impr operl y inst alled. Chec k alignment of fac es or damaged parts and
assembl y met hod us ed.
   Incorrect t ype of mechanical s eal f or operati ng
conditi ons. CONSULT FLO WSERVE.
     Shaf t running off centre because of worn bearings
or misalignment . Chec k misalignment and correct if necess ar y. If
alignment satisfact ory 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 t o improper repairs
causing impeller t o rub. Chec k met hod 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 t hrust c aus ed by a mechanic al failure
inside t he pump. Chec k wear condition of impeller, its clear ances and
liquid passages.
 
Exc essi ve greas e in ball bearings. Chec k met hod 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 met hod of ass embl y, possibl e damage or
state of cl eanliness during ass embly and t ype of
bearing us ed. Remedy or CONSU LT FLO WSERVE,
if nec essar y.
  Damaged bearings due to c ont ami nati on. Chec k contamination source and replac e damaged
bearings.
C. MOTOR ELECTRICAL PROBLEMS
   
Wrong direction of rot ation. Reverse 2 phases at motor t erminal box.
 
Motor running on 2 phases onl y. Chec k suppl y and fus es.
  
Motor running too slow. Chec k mot or ter minal box c onnecti ons and volt age.