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PAGE 42 — QP4TZT10P/TMP16F/TMPXF TRASH PUMP • OPERATION & PARTS MANUAL — REV. #1 (08/29/11)
TROUBLESHOOTING
Troubleshooting (Trash Pump)
Symptom Possible Problem Solution
Pump does not take on water.
Not enough priming water in the
housing?
Add water.
Engine speed too low? Increase throttle.
Strainer 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 inch - Max. .020 inch
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.