Multiquip High Pressure Centrifugal Pump (Honda GX340K1PKT2/GX340U1PKT2 Gasoline Engine) QPT305SLT - Manual (Page 24)

page 24 —Qp305SLT/QpT305SLT CeNTRIFUgaL pUMp • opeRaTIoN aNd paRTS MaNUaL — Rev. #1 (10/11/10)
trOublesHOOtinG
Troubleshooting (pump)
Symptom Possible Cause 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" - Max. .020".
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.