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Troubleshooting - Pumps

Pump Troubleshooting

Pump Does Not Prime

  • Suction lift too great
  • Inlet of suction pipe insufficiently submerged
  • Suction inlet or strainer blocked
  • Excessive amount of air or gas in liquid
  • Viscosity and / or S.G. of liquid being pumped too high
  • Suction line not air tigh
  • Suction hose collapsed
  • Non return valve ball not seating
  • Mechanical seal / Packing drawing air into pump
  • Pump’s priming system blocked or badly worn
  • Separation tank cover blocked
  • Pump’s priming hose leaking air

Pump Ceases to Deliver Liquid After a Time

  • Suction lift too great
  • Insufficient water at suction inlet
  • Suction inlet or strainer blocked
  • Suction hose collapsed
  • Excessive air leak in suction line
  • Mechanical seal / Packing drawing air into pump
  • Obstruction in pump casing / impeller
  • Delivery hose punctured or blocked

Pump Leaking at Mechanical Seal Housing

  • Mechanical seal damaged or worn

Pump Takes Excessive Power

  • Engine speed too high
  • Obstruction between impeller and wear plates
  • Viscosity and / or SG of liquid being pumped too high
  • Incorrect direction of rotation
  • Misalignment
  • Shaft bent

 

 

Not Enough Liquid

  • Incorrect engine speed
  • Discharge head too high
  • Suction lift too great
  • Suction inlet or strainer blocked
  • Suction line not air tight
  • Suction hose collapsed
  • Mechanical seal drawing air into pump
  • Obstruction in pump casing / impeller
  • Impeller excessively worn
  • Delivery hose punctured or blocked
  • Pump not primed
  • Air pockets in suction line
  • Inlet of suction pipe insufficiently submerged
  • Excessive amount of air or gas in liquid

Pump Bearings have Short Life

  • Obstruction in pump casing / impeller
  • Impeller out of balance
  • Shaft bent
  • Shaft running of centre because of worn bearings or misalignment
  • Misalignment
  • Bearings worn
  • Excessive thrust caused by mechanical failure inside pump
  • Lack of bearing lubrication
  • Incorrect assembly of stacked bearings, i.e. angular contact ball bearings fitted front-to-front instead of back-to-back
  • Dirt in bearings
  • Rusting of bearings from water in housing

 

Not Enough Pressure

  • Speed too low
  • Excessive amount of air or gas in liquid
  • Incorrect direction of rotation
  • Viscosity and / or S.G. of liquid being pumped too high
  • Impeller Damaged
  • Impeller out of balance

Pump Vibrating or Overheating

  • Engine speed too high
  • Obstruction in pump casing / impeller Impeller damaged
  • Cavitation due to excessive suction lift
  • Suction or discharge re-circulation of fluid within the pump
  • Impeller out of balance
  • Shaft bent
  • Shaft running of centre because of worn bearings or misalignment
  • Misalignment
  • Bearings worn
  • Pump not primed
  • Pump or suction pipe not completely filled with water Inlet of suction pipe insufficiently submerged
  • Excessive thrust caused by mechanical failure inside pump
  • Lack of bearing lubrication
  • Incorrect assembly of stacked bearings, i.e. angular contact ball bearings fitted front-to-front instead of back-to-back
  • Dirt in bearings
  • Rusting of bearings from water in housing

 

 

 

North America
Sales, Parts & Service
11000-A South Commerce Blvd
Charlotte, North Carolina NC 28273
Tel: +1 704 587 3377
Fax: +1 704 587 3388
Australia
Sales, Parts & Service
12 Hoskins Road
Landsdale, WA 6065, Australia
Tel: +61 (0)8 9302 7000
Fax: +61 (0)8 9302 2122