Made in the USA. Est. 1969

TROUBLE SHOOTING

TROUBLE

POSSIBLE CAUSE

CORRECTION

Pump will not prime

Wrong rotation	Check direction of rotation
Insufficient NPSH	Increase NPSH

Liquid not delivered

Pump not primed	Increase NPSH
Vapor pocket in suction line	Check for low points in suction line

Failure to deliver rated capacity & pressure

Insufficient NPSH	Increase NPSH
Wrong rotation	Check direction of rotation
Loss of suction pressure	Increase suction pressure
Impeller or Volute passages clogged or inlet restricted	Disassemble, inspect and clean
Wear rings worn	Replace
Impeller damaged	Replace
Vapor in liquid	Increase NPSH
Vapor pocket in suction line	Check piping for continuous slope. No point should be lower than pump inlet
Total head greater than head for which pump was designed	Cut impeller dia. and re-balance impeller for fixed speed pump. Reduce speed for trailer/variable speed pump

Pump overloads driver

Drive failure	Repair or replace driver
Flow greater than rated flow	Cut impeller dia. and re-balance impeller for fixed speed pump. Reduce speed for trailer/variable speed pump

Pump vibration

Insufficient NPSH	Increase NPSH
Vapor in liquid	Increase NPSH
Worn bearings	Replace
Damaged rotating element	Replace
Foundation not rigid	Increase support
Pump operating below minimum recommended flow	Increase flow
Impeller clogged	Disassemble, inspect and clean

Impeller rubbing

Impeller not tightened securely on shaft	Tighten impeller screw
Bearing failure	Replace bearings, inspect/replace impeller, seal and wear rings
Excessive pipe loading	Eliminate pipe loading in warm and cold conditions

Leakage between pump casings

Volute gasket

Replace

Excessive seal leakage

Sealing surface on seal or rotating ring damaged or worn	Replace seal assembly and rotating seal ring
Impeller not tightened securely on shaft	Tighten impeller screw