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95-03009
TROUBLESHOOTING GUIDE
This guide has been prepared on the assumption that the pump has been installed properly. If problems arise
and are not listed in the chart, pump cavitation may be the problem. Symptoms of pump cavitation, such as
noisy operation, insufficient discharge and vibration, can result when a pump is not properly applied. Check
the system and application. If assistance is required, contact Waukesha Cherry-Burrell Application Engineering
at 800-252-1218.
VIBRATION/NOISE
• Insufficient NPSH (Net Positive
Suction Head) available.
• Supply line too long; too small; blocked
• Air entrained in liquid
• Liquid too hot, too viscous
• Impeller out of balance.
• Motor bearings worn.
• Pump not level; legs not touching floor.
• Foreign material in pump.
• Piping not supported.
RAPID SEAL WEAR
• Excessive spring loading.
• Abrasive product.
• Water hammer.
• Prolonged "dry" running.
• Abrasive solids (unfiltered) in
water flushed seal supply.
SEAL LEAKS
• Gasket damaged or worn.
• Seal not installed correctly.
• Carbon seal worn or damaged.
• Inlet/Outlet connection loose or no
gasket.
• Casing clamp loose.
NOT ENOUGH LIQUID DELIVERED
• Impeller diameter too small for duty.
• Discharge head too high.
• Suction lift too high.
• Air leak in supply or at seal area.
• Wrong direction of rotation.
• Pump not primed.
• Speed too slow (low voltage, wrong
frequency, wrong motor.
• Suction or discharge plugged or closed.
• Air entrained in liquid.
• Insufficient NPSH (Net Positive Suction
Head) available.
NOT ENOUGH PRESSURE
• Impeller diameter too small for duty.
• Air leak in supply or at seal area.
• Wrong direction of rotation.
• Speed too slow (low voltage, wrong
frequency, wrong motor).
• Air entrained in liquid.
MOTOR OVERLOAD
• Discharge head too low allowing
pump to deliver too much liquid.
• Impeller diameter too large for duty.
• Liquid heavier or more viscous than
rating.
• Electrical supply, voltage or frequency
incorrect.
• Impeller interference
• Seal binding
• Defective motor.
• Faulty electrical connections.
• Overload heaters too small for motor.
WARNING
TO AVOID SERIOUS INJURY, DO NOT
INSTALL OR SERVICE PUMP UNLESS
ALL POWER IS OFF AND LOCKED OUT.
Summary of Contents for 200 series
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Page 25: ...24 95 03009 MAINTENANCE SEE PAGE 34 MOTOR MOUNTS ELECTRIC MOTORS ...
Page 26: ...25 95 03009 MAINTENANCE SEE PAGE 34 MOTOR MOUNTS ELECTRIC MOTORS ...
Page 30: ...29 95 03009 AVAILABLE SEALS FOR 200 SERIES PARTS LISTS Figure 38 ...
Page 40: ...39 95 03009 THIS PAGE IS INTENTIONALLY LEFT BLANK INSTALLATION DIMENSIONS Style A 7 12 96 ...