Troubleshooting (Engine/Pump) - MULTIQUIP QP3TZ Operation And Parts Manual

Symptom
Low engine power output and low speed,
black exhaust smoke.
Engine overheats.
Symptom
Pump does not take on water.
Pump takes in water, little or no discharge.
Suction hose leaks at inlet.
Discharge does not stay on coupling.
Impeller does not turn, pump is hard to start.
QP3TZ TRASH PUMP • OPERATION AND PARTS MANUAL — REV. #4 (05/15/14) — PAGE 25

TROUBLESHOOTING (ENGINE/PUMP)

Troubleshooting (Engine) - continued
Possible Problem
Air filter blocked?
Incorrect valve clearances?
Malfunction at injector?
Too much oil in engine crankcase?
Entire cooling air system contaminated/
blocked?
Fan belt broken or elongated?
Coolant insufficient?
Radiator net or radiator fin clogged with dust? Clean net or fin carefully.
Fan, radiator, or radiator cap defective?
Thermostat defective?
Head gasket defective or water leakage?
Troubleshooting (Trash Pump)
Possible Problem
Not enough priming water in the
housing?
Engine speed too low?
Strainer plugged?
Suction hose damaged?
Air leak at suction port?
Pump is located too high above water
line?
Debris collecting in pump housing?
Too much distance between impeller and
volute?
Water leaking out weep hole between
pump and engine?
Engine speed too low?
Suction strainer partially plugged?
Impeller/Volute worn?
Fittings/clamps are not sealed properly?
Hose diameter is too large?
Pressure too high?
Hose kinked or end blocked?
Impeller jammed or blocked?
Impeller and volute binding?
Defective engine?
Solution
Clean or replace air filter.
Adjust valves per engine specification.
See engine manual.
Drain off engine oil down to uppermark on
dipstick.
Clean cooling air system and cooling fin
areas.
Change belt or adjust belt tension.
Replenish coolant.
Replace defective part.
Check thermostat and replace if necessary.
Replace parts.
Solution
Add water.
Increase throttle.
Clean strainer.
Replace or repair hose, and clamps.
Check that fittings are tight and properly sealed.
Move pump closer to water.
Clean pump housing.
Adjust clearance by adding shims or replace
impeller. Min. .006 inch - Max. .020 inch
Check condition of mechanical seal and gaskets,
between pump end and engine housing.
Increase throttle speed.
Clean strainer.
Adjust clearance by adding shims or replace
impeller/volute.
Tighten, replace or add clamp. (Keep extra seals
on pump).
Use smaller diameter hose or replace hose.
Check pressure, add additional clamp.
Check hose.
Open pump cover and clean dirt and debris from
inside housing.
Adjust clearance by removing shim from behind
impeller.
See Engine Owner's Manual.