Finish Thompson DB3, 4, 5 & 5.5 Series - Manual (Page 11)

Section VII - Troubleshooting
General Notes:
• Do not pump liquids containing ferrous metal fines .
• If magnets decouple, stop pump immediately . Operating the
pump with the magnets decoupled will eventually weaken
the magnets .
• Do not use mismatched drive magnet assemblies (different
number of magnets on inner and outer drive magnet assemblies) .
• Phone FTI’s Technical Service Department, 1-800-888-3743,
or e-mail, techservice@finishthompson .com, if you have any
questions regarding product operation or repair .
No or Insufficient Discharge
• Air leaks in suction piping
• Pump not primed
• System head higher than anticipated
• Closed valve
• Viscosity or specific gravity too high
• Motor too large for magnet coupling rating (magnets uncoupled)
• Suction lift too high or insufficient NPSH
• Clogged suction line or impeller vanes
• Motor rotation incorrect (correct rotation when viewed from
the fan end is counter clockwise)
Insufficient Pressure
• Air or gas in liquid
• Impeller diameter too small
• System head lower than anticipated
• Motor speed insufficient or motor rotation incorrect (correct
rotation when viewed from the fan end is counter clockwise)
Loss of Prime
• Leak in suction piping
• Foot valve or suction opening not submerged enough
• Foot valve too small or leaking
• Air or gas in liquid
• Foreign matter in impeller
• Suction lift too high or insufficient NPSHa
Excessive Power Consumption
• Head lower than rating
• Excessive flow
• Specific gravity or viscosity too high
Vibration/Noise
• Loose magnet
• Drive magnet rubbing
• Pump cavitating from improper suction or feed
• Motor or piping not properly secured
• Foreign object in impeller
Section VIII - Warranty
Finish Thompson, Inc (manufacturer) warrants this pump product
to be free of defects in materials and workmanship for a period of
five years from date of purchase by original purchaser . If a war-
ranted defect, which is determined by manufacturer’s inspection,
occurs within this period, it will be repaired or replaced at the
manufacturer’s option, provided (1) the product is submitted with
proof of purchase date and (2) transportation charges are prepaid
to the manufacturer . Liability under this warranty is expressly lim-
ited to repairing or replacing the product or parts thereof and is
in lieu of any other warranties, either expressed or implied . This
warranty does not apply to normal wear of the product or compo-
nents . This warranty does not apply to products or parts broken
due to, in whole or in part, accident, overload, abuse, chemical
attack, tampering, or alteration . The warranty does not apply to
any other equipment used or purchased in combination with this
product . The manufacturer accepts no responsibility for product
damage or personal injuries sustained when the product is modi-
fied in any way . If this warranty does not apply, the purchaser
shall bear all cost for labor, material and transportation .
Manufacturer shall not be liable for incidental or consequential
damages including, but not limited to, process down time, trans-
portation costs, costs associated with replacement or substitu-
tion products, labor costs, product installation or removal costs,
or loss of profit . In any and all events, manufacturer’s liability shall
not exceed the purchase price of the product and/or accessories .
Ordering Spare Parts
Spare parts can be ordered from your local distributor . Always
refer to the pump model to avoid error .
Other FTI Products
See our full product range at www .finishthompson .com .
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