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PROBLEM
POSSIBLE CAUSE
Pump won't prime
• Suction line problem
• Leaky check valves
• Check valves improperly installed
• Outlet plugged
• Motor not operating
• Stripped or damaged gears
Pump hums but
• Motor faulty
will not rotate
• Gear mechanism jammed
Low pump capacity
• Low voltage
• Leaky suction line
• Dirt in check valve
• Faulty check valves
• Debris ingested
Motor overheats
• Pumping hot fluids
• Motor faulty
Fluid Leakage
• Faulty or missing gaskets
• Loose bolts
• Cracked component
Regulatory Compliance Information
The "400B CE" series pumps comply with the European Directive 2006/42/EC Machinery Directive. The following standards were
used to verify conformance.
EN 809:1998 +A:2009 – Pumps and pump units for liquids – Common safety requirements.
EN ISO 12100:2010 – Safety of Machinery – Basic concepts, general principles for design.
Directive 2014/30/EU – Electromagnetic compatibility.
EN 61000-6-4:2007 / +A1:2011 - General Standard for Industrial Environments
Directive 2011/65/EU – Restrictions of the use of certain hazardous substances in electrical and electronic equipment.
Specific models of the 400 series pumps feature UL / cUL listed electric motors. Check your model versus the Model / Accessories
/ Configuration Information table (pages 11 -12) to determine how your particular pump is equipped.
TROUBLESHOOTING GUIDE
SOLUTION
• Check for leaks in suction line.
• Check for dirt or damaged check valves and replace.
• Check for proper installation. See below.
• Check for blockage and clear.
• Check power source.
• Repair or replace motor.
• Check gear assembly and drive gear for damage.
Replace complete assembly if necessary.
• Replace motor.
• Check for free rotation of the gears.
• Check power source.
• Repair leaks.
• Dismantle and clean.
• Install repair kit.
• Add inlet screen.
• Shorten duty cycle.
• Replace motor.
• Install all gaskets specified in parts list.
• Torque all 1/4" torx head bolts to 75 in lbs.
• Torque hex head 1/4-20 motor bolts to 50 in. lbs.
• Replace defective component.
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