Multiquip QP3TZ - Manual (Page 25)

QP3TZ TRASH PUMP • OPERATION AND PARTS MANUAL — REV. #4 (05/15/14) — PAGE 25
TROUBLESHOOTING (ENGINE/PUMP)
Troubleshooting (Engine) - continued
Symptom Possible Problem Solution
Low engine power output and low speed,
black exhaust smoke.
Air filter blocked? Clean or replace air filter.
Incorrect valve clearances? Adjust valves per engine specification.
Malfunction at injector? See engine manual.
Engine overheats.
Too much oil in engine crankcase?
Drain off engine oil down to uppermark on
dipstick.
Entire cooling air system contaminated/
blocked?
Clean cooling air system and cooling fin
areas.
Fan belt broken or elongated? Change belt or adjust belt tension.
Coolant insufficient? Replenish coolant.
Radiator net or radiator fin clogged with dust? Clean net or fin carefully.
Fan, radiator, or radiator cap defective?
Replace defective part.
Thermostat defective? Check thermostat and replace if necessary.
Head gasket defective or water leakage? Replace parts.
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 fittings 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.