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  Tri-Rotor Pumps are made in USA!

Design Flexibility • Engineering Assistance
Most Pumps in Stock for Immediate Shipment

Trouble Shooting

TROUBLE
TYPE OF PUMP
LOOK FOR
VARIABLE
HEAD
BYPASS
HEAD
SOLID
HEAD
CW PUMP RUNNING CCW. OR VICE VERSA
MOTOR WIRING REVERSED
PIPING TO WRONG PORTS
DISCHARGE HEAD TOO HIGH
PIPING TOO SMALL, TOO LONG
VISCOSITY TOO HIGH
 
 
FLOW CONTROL TURNED DOWN TO ZERO
 
 
PAWL PIN MISSING
CONTROL SPRING- not adjusted - wound backwards - distorted - broken out of top or bottom spring plate
 
 
RELIEF VALVE SPRING - not adjusted - not in correct position - spring broken
 
 
PLUNGER FROZEN IN BOTTOM POSITION - corroded parts - pumpage shear sensitive - dirt accumulation preventing movement
 
 
RELIEF VALVE - not fully seated - stuck on valve guide pin - need lapping into seat - spring adjusting plate missing
INADEQUATE PRIMING CONDITIONS SUCH AS - suction line air leak - foot valve stuck - lift too great - altitude too high - vapor lock
ROTOR GROUP WORN / MECHANICAL SEAL WORN OR BROKEN

CAVITATING
VIBRATING
HIGH AMP. DRAIN

STARVED SUCTION LINE DUE TO - suction line restricted - viscosity too great for piping - RPM too high for viscosity
PUMP
RUNNING
HOT
PACKING TOO TIGHT
MISALIGNMENT
OBSTRUCTION IN ROTOR GROUP
RUSTED PARTS- blush rust causing parts to seize together
 
TOO LONG RUNNING IN FULL BYPASS CYCLE OR ZERO STROKE
OVERSPEEDING
CAVITATION

PUMP FROZEN
CAN'T TURN
SHAFT

PACKING TOO TIGHT
MISALIGNED PUMP
INSUFFICIENT LUBRICATION OF SHAFT
PUMPAGE - shear sensitive - congealed - caramelized - solidified
TEMPERATURE OF ALL BRONZE OR BRONZE FITTED PUMP EXCEEDING 140°F
ROTOR GROUP NOT RELIEVED
NOISY
PUMP
CAVITATION
WORN ROTOR GROUP
AIR LEAK INTO SUCTION LINE
 
PLUNGER OR VALVE BOUNCING DUE TO-
suction line restriction - relief valve in discharge line reacting with pump spring setting - PIPING RESONANCE
EXCESSIVE
LEAKAGE FROM
PACKING GLAND
PACKING NUTS INCORRECTLY ADJUSTED
PACKING WORN
MECHANICAL SHAFT SEAL WORN OR BROKEN
SHAFT SCORED
REDUCTION
OF FLOW
OR PRESSURE
 
 
PAWL PIN BROKEN
CONTROL SPRING SETTING INCORRECT
CONTROL PLUNGER STUCK
 
 
BYPASS SPRING SETTING INCORRECT
VALVE UNSEATED OR WORN
PUMP WORN
RESTRICTION OR TOO HIGH VISCOSITY IN SUCTION LINE

PREMATURE
WEAR

 

SHORT PUMP
LIFE

MISALIGNMENT - end or side thrust on shaft
PACKING TOO TIGHT OR ADJUSTED INCORRECTLY
DIRTY OR ABRASIVE PUMPAGE
RUNNING PUMP DRY - repeated suction lift
OVERSPEEDING
NON-LUBRICATING PUMPAGE OPERATING ABOVE 50 PSI & 350 RPM
 
 
FLOW CONTROL LINE SET BELOW 25% CAPACITY FOR TOO LONG PERIODS
SUCTION LINE RESTRICTED CAUSING PLUNGER TO “BOUNCE”
SCORED OR
GOUGED PARTS
MISALIGNMENT - transmittal of end thrust from motor shaft - excessive belt tension - PIPE STRAIN - OVER TIGHTENING OF GLAND