Product Manual

MQ62TK SERIES TRASH PUMP • OPERATION AND PARTS MANUAL — REV. #0 (01/30/18) — PAGE 41
PUMP TROUBLESHOOTING
Troubleshooting (Trash Pump)
Symptom Possible Problem Solution
Pump does not prime.
Not enough water in the housing? Add water.
Engine speed too low? Increase engine RPM to full speed.
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 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?
Replace impeller or adjust clearance by adding
shims. 0.01 – 0.02 inch (0.25 – 0.51 mm)
Water leaking out of sight glass? Check condition of mechanical seal.
Pump takes in water, little or no discharge.
Engine speed too low? Increase engine RPM to full speed.
Suction strainer partially plugged? Clean strainer.
Worn impeller or volute? Adjust clearance 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 too large? Use correct diameter hose.
Discharge does not stay on coupling.
Pressure too high? Check pressure, add additional clamp.
Hose kinked or end blocked? Check hose.
Engine is locked or slow to start.
Impeller jammed or blocked?
Open pump cover and clean dirt and debris from
inside housing.
Impeller and wear plate binding?
Inspect for clearance 0.01 – 0.02 inch
(0.25 – 0.51 mm). Add or remove shims.
Defective engine? See engine owner's manual.
Impeller binding to rear adaptor plate?
Adjust clearance by adding or removing shims
0.025 – 0.040 inch (0.64 – 1.02 mm)