Troubleshooting (Engine/Pump) - MULTIQUIP QP4TH Operation And Parts Manual

Symptom
Operation not satisfactory
Rotational speed fluctuates.
Recoil starter not working properly.
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.
QP4TH TRASH PUMP • OPERATION AND PARTS MANUAL — REV. #3 (01/29/14) — PAGE 27

TROUBLESHOOTING (ENGINE/PUMP)

Table 7. Engine Troubleshooting
Possible Problem
Governor adjustment improper?
Governor spring defective?
Fuel flow erratic?
Air taken in through suction line?
Dust in rotating part?
Spring failure?
Table 8. Pump Troubleshooting
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? Move pump closer to water.
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
Adjust governor to correct lever.
Clean or replace ignition.
Check fuel line.
Check suction line.
Clean recoil starter assembly.
Replace spiral spring.
Solution
Add water.
Increase throttle.
Clean strainer.
Replace or repair hose, and clamps.
Check that fittings are tight and properly
sealed.
Clean pump housing.
Adjust clearance by adding shims or
replace impeller. Min. .006" - Max. .020".
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.