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QP2E CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (02/12/09) — PAGE 25
TROUBLESHOOTING
Pump TroubleshootingTable 8.
Symptom Possible Cause Solution
Pump does not take on
water.
Not enough priming water in the housing? Add water.
Engine speed too low? Increase throttle.
Strainner plugged? Clean strainer.
Suction hose damaged? Replace or repair hose, and clamps
Air leak at suction port?
Check that fi ttings are tight and properly
sealed.
Pump is located too high above water line? Move pump closer to water.
Debris collecting in pump housing? Clean pump housing.
Too much distance between impeller and
volute?-
Adjust clearance by adding shims or replace
impeller. Min. .006"" - Max. .020""
Water leaking out weep hole between pump
and engine?
Check condition of mechanical seal and
gaskets, between pump end and engine
housing.
Pump takes in water,
little or no discharge.
Engine speed too low? Increase throttle speed.
Suction strainer partially plugged? Clean strainer.
Impeller/Volute worn?
Adjust clearance by adding shims or replace
impeller/volute
Suction hose leaks at
inlet.
Fittings/clamps are not sealed properly?
Tighten, replace or add clamp. (Keep extra
seals on pump)
Hose diameter is too large? Use smaller diameter hose or replace hose.
Discharge does not stay
on coupling.
Pressure too high? Check pressure, add additional clamp.
Hose kinked or end blocked? Check hose.
Impeller does not turn:
pump is hard to start.
Impeller jammed or blocked?
Open pump cover and clean dirt and debris
from inside housing.
Impeller and volute binding?
Adjust clearance by removing shim from
behind impeller.
Defective engine? See Engine Owner's Manual.