Multiquip MQ600TD80 - Manual (Page 47)

mq600Td80 TRaSH pUmp• opeRaTion and paRTS manUal — Rev. #11 (10/10/11) — page 47
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Troubleshooting (Trash pump)
Symptom possible problem Solution
Pump does not prime.
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 gaskets or replace
impeller. .010 - 020 inch (0.25 - 0.51 mm)
Water leaking out sight glass? Check condition of mechanical seal.
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 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.
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 .010 - 020 inch (0.25 - 0.51
mm) . Add or delete gaskets.
Defective engine? See Engine Owner's Manual.
Impeller binding to rear adaptor plate?
Adjust clearance by adding or removing shims
0.25 - 0.40 inch (0.64 - 1.02 mm)